[brettheap]

Lane: openreposhape-4 (openRepoShape-4)
Claim: #855 (comment)

Round 1 (RV868, #868 issuecomment-6245096782)

RV868 found the head 62074123 READY, with no MUST. This round adds one commit, a9495341, which changes tests/test_bom_reads.py only. scripts/repo_shape.py and bootstrap.py are byte for byte what they were (sha256 below), so every Before and Now line in this body holds for the new head.

RV868 item	what was done
SHOULD-1: pin "only the start" of the strip	Four rows, each mark written from codecs.BOM_UTF8. load_yaml reads k: "<mark>x" as {"k": "<mark>x"}, commit: <mark> and 40 a as a commit that starts with U+FEFF, and k: v then <mark>j: w as the two keys 'k' and '\ufeffj'. The upstream notice says nothing for that pin. PyYAML 6.0.3 reads the three files the same (measured). RV868's mutant A (text.replace(BYTE_ORDER_MARK, "")) is killed now, 4 failed. Its mutant B and lane 4's four are still killed (Mutants, below).
SHOULD-2: _shape_block_bounds refuses a marked project.yaml whose first line is shape:	Disclosed under What it cannot tell, beside the two commit: rewriters, with its refusal measured on the head. update-shape.py and scripts/bump-leg.py are not changed here. A checklist line for #459, covering all three finders, is posted: #459 issuecomment-6245477657.
NIT-1: the spec argument in choice 2	Choice 2 now cites YAML 1.2.2 productions [211] and [202]. Two leading marks are two document prefixes, so the head's reading is the spec's and PyYAML's is not. A mark after leading comment lines is left as it was.
NIT-2: refresh Shared files	Taken again against main 0905eef5, #823 7c20ba96 (375 passed on the merge) and #871 (new). The #815 pre-resolution was made again over that main, in both orders: one tree each way, 34 passed.
NIT-3: the UnicodeDecodeError position	One sentence under What it cannot tell.
NIT-4: cross-version reading not measured	No change. It stays disclosed as "A root's own copies".

What changed and why

Milestone v1.1.1: a DRAFT. It merges with #815 (#764), which moves the cache read into _cached_tip, by a pre-resolution that gives one tree whichever of the two lands first (see With #815, below). Issue #855 has two lines, filed by lane 5 from rv815's NIT 8 on #815. A file a Windows editor saved with a byte-order mark (the bytes EF BB BF) was read as no commit, or as a first key spelled with U+FEFF. Each is read now as the text it holds, by every reader of it.

Every Before and Now line below was measured by loading the shipped scripts and calling them, and by running them in a scaffolded probe project (Atlas, local bare remotes), with a stub gh that exits 1 first on PATH, GH_TOKEN=bogus, an empty GH_CONFIG_DIR and an empty global git config:

• Before is main 9f235da2.
• Now is the head 620741235dac. Round 1's a9495341 changes the test file only, so each line holds for it.
• In the probe project, project.yaml and the three pins contracts/{shape,spec,code}-pin.yaml were each given the mark, and .shape-upstream-tip held the mark, 40 hex and CRLF.

Line 1: .shape-upstream-tip (templates/assembly-root/scripts/bootstrap.py:885 on main), a pinned copy

shape_upstream_notice read the cache with read_text(encoding="utf-8").strip(). str.strip() keeps U+FEFF, so the tip did not match COMMIT_40 and the notice returned.

Measured in a root whose contracts/shape-pin.yaml says commit: and 40 a, and whose cache holds 40 b:

cache	Before	Now
no mark, LF	shape: the upstream is at bbbbbbbbbbbb and this project is pinned at aaaaaaaaaaaa. Run openRepoShape's ...	the same
the mark, LF	nothing	the same line
the mark, CRLF	nothing	the same line

Now the cache is read as utf-8-sig (:888), which takes the mark off and reads a file without one as utf-8 does.

Line 2: repo_shape.parse_yaml (scripts/repo_shape.py:1095 on main 3bf2d3c9), a pinned copy

load_yaml read with read_text(encoding="utf-8") (:1124 on main 3bf2d3c9) and handed the text to parse_yaml, which kept U+FEFF as the first character of the first key.

file, as load_yaml reads it	Before	Now
commit: and 40 a, then other: 1	keys 'commit', 'other'	the same
the same, with the mark	keys '\ufeffcommit', 'other'	'commit', 'other'
the same, with two marks	keys '\ufeff\ufeffcommit', 'other'	'commit', 'other'
# a comment first, with the mark	REFUSED yaml-unparsable: <file>: line 1: expected key: value, got '\ufeff# a comment'	'commit', 'other'
the shape pin with the mark, as the notice reads it, a good cache	the notice says nothing (pinned is '')	the notice names the tip
the mark, then k: v and the byte 0xff (file byte 7)	not UTF-8 at byte 7 (invalid start byte)	the same

In the probe project with its files marked:

run	Before	Now
scripts/validate-manifest.py	FINDING manifest-schema-version: schema_version is None, expected 1, exit 1	manifest ok: Atlas (atlas), 3 legs, exit 0
scripts/validate-pins.py	pins ok (no pin key it reads is the first)	pins ok
scripts/bootstrap.py	bootstrap FAILED: manifest (exit 1), and no notice	the notice shape: the upstream is at 0123456789ab ..., then bootstrap ok
update-shape.py check	exit 0, unchanged 11	the same
shape-doctor.py	INVALID (manifest), exit 1	COMPLIANT, exit 0
update-shape.py apply --at <a new commit> --yes --branch shape/probe	re-pinned ..., then REFUSED update-validators-red: after the rewrite, scripts/validate-manifest.py refused., rolled back, exit 2	re-pinned contracts/shape-pin.yaml and project.yaml ..., committed on shape/probe, exit 0, and both validators pass after it

Now parse_yaml takes off every byte-order mark the text starts with (text.lstrip(BYTE_ORDER_MARK), :1066), as scripts/shape_advisory.py:387 and :670 already did. load_yaml is unchanged: it still decodes as utf-8, so its not-UTF-8 refusal still counts the byte from the file's first byte, the mark's three included (utf-8-sig there would have said byte 4 of that file). Why the parser and not load_yaml is choice 1 below.

YAML allows the mark there. YAML 1.2.2 section 5.2: "If a character stream begins with a byte order mark, the character encoding will be taken to be as indicated by the byte order mark", and "Byte order marks may appear at the start of any document". Section 9.1.1 gives l-document-prefix ::= c-byte-order-mark? l-comment*, and its Example 9.1 is a mark followed by # Comment: the issue's comment-first file.

Every site touched

file	sites
templates/assembly-root/scripts/bootstrap.py (pinned)	shape_upstream_notice: the cache read, utf-8-sig, with a comment
scripts/repo_shape.py (pinned)	the new BYTE_ORDER_MARK; parse_yaml, its docstring and its first line
tests/test_bom_reads.py	new

Every reader agrees: the inventory

Every place in scripts/, templates/ and the repository root that reads .shape-upstream-tip, project.yaml, family.yaml or a contracts/*.yaml other than through load_yaml, with read_text, open, git show or git cat-file. .shape-upstream-tip has one reader, line 1's. Each of the others was asked with a marked file on main and on this head, in two shapes: as the tools write it (every template's first line is schema_version: 1), and with a person's comment line above that, which this table calls "comment first".

reader (path:line on main)	what it reads	Before, marked	Now, marked
shape-doctor.py:3760 pin_at	a pin at a commit (git cat-file), then parse_yaml	11 rows; comment first: None, does not read	11 rows, both shapes
update-shape.py:5079 _committed_pin	HEAD's shape pin (git show), then parse_yaml	the commit; comment first: ''	the commit, both shapes
adopt-project.py:12626 _pinned_shape_paths	a shape pin's blob, then parse_yaml	11 rows; comment first: None	11 rows, both shapes
scripts/shape_materialize.py:2452 pin_values_in (rewrite_fault, and bump-leg.py:1664's old -> new commit)	a pin's text	the commit; comment first: ValueError: line 1: expected key: value, got '\ufeff# saved by hand'	the commit, both shapes
scripts/shape_advisory.py:387, :670 (every leading mark stripped first)	project.yaml, single-repository.yaml	schema_version, where load_yaml read '\ufeffschema_version'	the mapping load_yaml reads, with one mark or two
scripts/bump-leg.py:470, then rewrite_pin (:254)	a leg pin's text, rewritten	written, the mark kept, both shapes	the same
update-shape.py:4401, :4404 (_repin)	the shape pin and the manifest, rewritten	the mark kept, then rolled back (the round trip, below)	the mark kept, committed
scripts/family.py:395 Family.rewritten	family.yaml, its members: block rewritten	written, the mark kept	the same

update-shape.py:5122 (_accepted_in_the_pin) hands parse_yaml the git show text of the tracking branch's shape pin, as _committed_pin does HEAD's. It was not run.

Every other read of these files is through load_yaml, so it reads as load_yaml does: the three validators, both roots' bootstrap.py, siblings.py, validate-family.py, and the manifest and pin readers of update-shape.py, bump-leg.py, family.py and shape-doctor.py. The reads of their BYTES (digests, rollbacks, comparisons: repo_shape.file_sha256, update-shape.py:794, scripts/family.py:7009, shape-doctor.py:5924) see the mark as the byte change it is. A marked contracts/repository-naming.yaml is a modified pinned copy. No workflow, Makefile or shell script reads any of these files as text: both validate.ymls read .gitmodules, and setup.sh:95 tests that contracts/repository-naming.yaml is there.

The reader that disagreed, and would have sent a person the wrong way, with the mark taken off in load_yaml alone (the ruling as first given; choice 1):

1. HEAD holds a comment-first marked shape pin, committed, which update-shape.py apply then re-pinned. validate-pins.py says pins ok.
2. The working pin is broken (files: [ appended).
3. Measured, the doctor's NEXT: git -C <root> checkout '<the hand-saved commit>~1' -- contracts/shape-pin.yaml, its why calling that commit "the commit that broke it". That puts back the pin from before the hand-save, which names the commit apply had moved it off.

On this head the same run's NEXT is git -C <root> checkout HEAD -- contracts/shape-pin.yaml, restore uncommitted. On main the same run's apply is refused at line 1 (REFUSED yaml-unparsable), and every reader agrees that the pin does not read.

The round trip

The tools that rewrite these files rewrite lines, and keep the mark where it is:

• update-shape.py apply (the shape pin and the manifest's shape: block). It is the full run measured above. On main it re-pinned and rolled back, because the root's own validate-manifest.py read the marked manifest as schema_version is None. Now it commits, both files still start with the mark and name the target, and both validators pass.
• bump-leg.py's rewrite_pin (a leg pin): written, starts with the mark, names the new commit. The same on main.
• family.py's Family.rewritten (family.yaml): written, starts with the mark. The same on main.

None fails because of this PR, and none was changed.

Tests

tests/test_bom_reads.py is new: 25 tests. Every mark is written by the test as bytes (codecs.BOM_UTF8); no file holds a raw U+FEFF.

• Line 1 (the template's shape_upstream_notice, in process): the cache with no mark, with the mark, and with the mark and CRLF. Each says the upstream's tip.
• Line 2:
  • load_yaml reads commit:-first and comment-first files with no mark, one and two as the keys commit and other (6 tests).
  • The notice reads the shape pin with no mark, one and two (3).
  • A byte that is not UTF-8 after the mark is counted from the file's first byte: not UTF-8 at byte 7.
  • shape_advisory._read_mapping and load_yaml read a marked project.yaml, with one mark and two, as one mapping (2).
  • A probe project whose project.yaml and three pins are marked, and whose cache is marked with CRLF, bootstraps bootstrap ok with the notice.
• The readers that hand parse_yaml a pin's text, each given a committed, comment-first, marked pin, and each asked to read what load_yaml reads of the same bytes: pin_values_in, _committed_pin, pin_at and _pinned_shape_paths.
• Only the start is taken off (round 1, RV868's SHOULD-1). A mark after the start of the text stays text: in a quoted value, at the start of a value (commit: <mark> and 40 a), and at the start of the second key (3). The notice says nothing for a pin whose commit starts with the mark (1).
• The regression row: the doctor run above, with tests/test_shape_doctor.py's session standard and project, and tests/test_doctor_pin_restore_merges.py's moved_on and apply_on. After the re-pin, the NEXT for the broken working pin is checkout HEAD -- contracts/shape-pin.yaml, restore uncommitted.

On main, 16 of the 25 fail. The 9 that pass are the rows with no mark, the byte-7 row and the four round-1 rows, which pin the boundary and not the fix.

Mutants

Each mutant was written into the head, the new file run, and the file put back byte for byte, its sha256 checked after each. These are on round 1's head a9495341 (25 tests):

mutant	result
the parser's strip removed (_tokenise(text))	killed: 14 failed, 11 passed
the parser strips one mark (text.removeprefix(BYTE_ORDER_MARK))	killed: 4 failed, the four two-mark rows
line 1 back to utf-8	killed: 3 failed, the two marked caches and the bootstrap row
the ruling as first given: the strip removed and load_yaml reading utf-8-sig	killed: 10 failed. Among them are the four reader rows, the byte-7 row, and the regression row at its NEXT ('committed' == 'uncommitted').
RV868's A: every mark anywhere (text.replace(BYTE_ORDER_MARK, ""))	killed: 4 failed, the three round-1 rows and the notice row. It survived 749 tests before round 1.
RV868's B: the strip in load_yaml after a utf-8 decode, none in the parser	killed: 5 failed. They are _committed_pin, pin_at, _pinned_shape_paths, pin_values_in and the regression row.

What it cannot tell

• A cache with two marks still reads as no commit: utf-8-sig takes off one (measured, the same on main). The parser takes off every mark. Choice 3.

• A cache holding the mark, then the byte 0xff still ends make bootstrap in a UnicodeDecodeError traceback on main and on this head: bootstrap.py (the assembly root's): a SHAPE_UPSTREAM_PATH directory nobody may enter ends in a traceback, a validator's refusal is reported as FAILED, exit 1, a reftable leg's cherry-pick goes unseen, and docs/cli.md says bootstrap places each leg AT the pin with no condition #764's subject, which bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 fixes. Its position changes, from 3 on main to 0 on the head, because utf-8-sig counts from after the mark (measured). Once bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815's _cached_tip catches the error, nobody sees it (With bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815, below).

• A pin whose first line is commit:, with the mark. The two line rewriters find commit: at column 0 only, so each refuses it, as on main (measured):

  • scripts/bump-leg.py:292: REFUSED bump-leg-pin-unrecognised: the pin file has 0 commit line(s) where exactly one was expected, so this tool will not rewrite it.
  • update-shape.py:1532: REFUSED update-pin-unrecognised: contracts/shape-pin.yaml has 0 commit line(s) where exactly one was expected, so this tool will not rewrite it.

• A project.yaml whose first line is shape:, with the mark (round 1, RV868's SHOULD-2). update-shape.py:1683 (_shape_block_bounds, its header search, def at :1649) finds the header at column 0 only. So rewrite_manifest refuses it at :1698. Measured on the head, in process:

  • REFUSED update-manifest-no-shape: project.yaml has no shape: block, so there is nothing to mirror the pin into;
  • but on that file the project's own validate-manifest.py says manifest ok: Atlas (atlas), 3 legs, and load_yaml reads shape.commit.

  The same file without the mark is written, and so is a marked one with schema_version: first.

  No tool writes such a file: every template's first line is schema_version: 1. It is not a regression: on main the reader refused or misread such a file first. The validators and the readers above read it now, so each of the three refusals says something they do not. Taking them would mean matching the key after a leading mark on line 1 in all three finders, and writing the mark back as it was. That is outside this PR's two files, and is posted as a Tracking: setup, scaffold, family and the shared helpers, creating projects and families #459 line by lane 4: issuecomment-6245477657.

• A mark after the first character is text, as it was, and round 1's rows pin it: k: v, then the mark and j: w, reads the keys 'k' and '\ufeffj'. PyYAML 6.0.3 reads the same keys (measured). YAML 1.2.2 section 5.2's Example 5.2 says "A BOM must not appear inside a document"; the reader does not refuse one.

• A root's own copies. Until a root takes the two upstream-changed rows (Pinned copies, below), its scripts/repo_shape.py reads a marked file as main does, so its validators still say schema_version is None of a marked project.yaml. The tools run from a checkout of this standard read it through the checkout's scripts/repo_shape.py.

• A family holder carries scripts/repo_shape.py (FAMILY_COPIED_FROM_SHAPE, scripts/shape_materialize.py:552) and gets its upstream-changed row too. Its scripts/bootstrap.py is templates/family-root/'s, which reads no cache, and is not changed. Not run on a holder.

• Windows. CI is Linux only (ci: run the test suite on Linux only #597), and the bytes are written by the tests. No editor was run: that a Windows editor adds the mark is the issue's account, not measured here.

Choices for the reviewer

1. The parser takes the mark off, not load_yaml's decode.
   • The ruling as first given (lane 4, on the issue's "decide first"): accept the mark, read with encoding="utf-8-sig" at both reads, on the condition that every reader of these files agrees, because one file read two ways is worse than either answer.
   • What I measured. With utf-8-sig in load_yaml, every validator and update-shape.py apply read a comment-first marked pin. Four readers do not go through load_yaml: the doctor's pin_at, update-shape.py's _committed_pin (and _accepted_in_the_pin), adopt-project.py's _pinned_shape_paths, and pin_values_in. They read a pin's text from git, or hand over the text of a file they read themselves, and give it to parse_yaml. They still read that pin as broken. After a re-pin and a broken working pin, the doctor's NEXT put back a pin from before the hand-save (above).
   • Why the parser. Every one of those readers, and load_yaml, ends in parse_yaml, in one of this PR's two files. So one change there makes them agree, and none of their files changes. load_yaml stays utf-8, so the decode's byte offsets stay right with no change to it: utf-8-sig counts a bad byte from after the mark, and the refusal's remedy counts from the file's start. The coordinator took this (option 1) after that measurement; the regression row and the fourth mutant hold it.
2. Every leading mark, not one.
   • shape_advisory.py already takes off every one (lstrip), so the parser now agrees with it at one mark and at two (tests). With the parser taking one, a file with two read the first key as U+FEFF and the key, which is bootstrap.py (the assembly root's) and repo_shape.py: a .shape-upstream-tip or a YAML file saved with a byte-order mark reads as no commit, or as a first key spelled with U+FEFF, so make bootstrap's upstream notice stays silent #855's defect again.
   • It is the spec's reading (round 1, RV868's NIT-1). YAML 1.2.2 production [211] is l-yaml-stream ::= l-document-prefix* l-any-document? ..., and production [202] is l-document-prefix ::= c-byte-order-mark? l-comment*. Each prefix may hold one mark, and a stream may open with any number of prefixes, so two leading marks are two prefixes, and valid YAML.
   • PyYAML 6.0.3 takes off one (measured): two marks are the key '\ufeffk' to it, and two before a comment line it refuses (mapping values are not allowed here). That reading is not the spec's.
   • Left as it was. By [211], a mark after leading comment lines is a prefix too. The head reads its key as '\ufeffk', as main and PyYAML do. No editor writes such a file, so it is left (RV868).
3. Line 1 keeps utf-8-sig. The cache is not YAML and only shape_upstream_notice reads it, so it is the smaller change (one word). Taking every mark there would mean read_text(encoding="utf-8").lstrip(...), a longer line, or importing BYTE_ORDER_MARK from repo_shape, which a root whose scripts/repo_shape.py is older than its bootstrap.py would fail to import. A cache with two marks is left (What it cannot tell).
4. No refusal by name. The issue's other option was yaml-unreadable naming the mark. The mark cannot be seen and a Windows editor may add it unasked, so refusing it only makes a person save the file again; the tools write theirs without one.
5. BYTE_ORDER_MARK is a module constant in repo_shape.py, beside parse_yaml, so the strip names what it takes. shape_advisory.py's own BOM is left as it is.
6. The run's file list (The run, below) adds 13 files to the brief's list: those that name parse_yaml or one of the four readers, since the change is in the parser every YAML read goes through.

With #815 (#764), whichever lands first

#815 (fix/764-bootstrap-notice-exit-texts, 05a1ebb3) moves the cache read into _cached_tip. This PR changes the read where it stands on main, inline in shape_upstream_notice, so the two conflict in that one block. Lane 5, #815's owner, is out of service for now, and lane 4's coordinator decides the order. Either order merges by the same pre-resolution.

Pre-resolved. The one conflict is in templates/assembly-root/scripts/bootstrap.py. It is resolved by taking #815's tip = _cached_tip(root) and putting utf-8-sig, and this PR's sentence, into _cached_tip. A script makes it, in a separate clone, never pushed. The script takes the two sides in either order, and refuses any other conflict. It is kept for the merge round.

@@ -960,10 +960,14 @@ def _cached_tip(root: Path) -> str | None:
     UTF-8, none of which is a commit (#764). The last two ended `make
-    bootstrap` in a `PermissionError` or a `UnicodeDecodeError` traceback."""
+    bootstrap` in a `PermissionError` or a `UnicodeDecodeError` traceback.
+
+    `utf-8-sig` takes off the byte-order mark a Windows editor may start
+    the file with (#855). `strip()` keeps U+FEFF, so a marked tip read as
+    no commit and the notice said nothing."""
     cache = root / SHAPE_UPSTREAM_CACHE
     try:
-        return (cache.read_text(encoding="utf-8").strip()
+        return (cache.read_text(encoding="utf-8-sig").strip()
                 if cache.is_file() else None)

That is the merge against #815's head. On round 1's head a9495341 it was made each way, directly and over main 33419925 (taken again on 2026-10-18 at 05:00Z, for RV868b's NIT-3), and gave one tree each way:

merge	conflicted	tree
#815's head into this head	bootstrap.py, the one block	7af1a9d1df78efdc0df2f142b2b52f6ae005088b
this head into #815's head	the same block	7af1a9d1df78efdc0df2f142b2b52f6ae005088b
#815 into this head merged with main 33419925 (this PR lands first)	the same block	5440d236e3e41bab901fc19bbdc5941e3051f46f
this head into main 33419925 merged with #815 (#815 lands first)	the same block	5440d236e3e41bab901fc19bbdc5941e3051f46f

The opening head 62074123 gave 501471f6 directly, 8b0dbc19 over main ca47b71d and bede79f3 over 4dea85ee, each the same in both orders, as RV868 measured too. Round 1's own figure over main 0905eef5 was 1fb57a35, and RV868b measured 764d95c6 over d6475f96 and ec9a38fa over 80aee84e, each the same in both orders. The script (lane 4's resolve-815.py, unchanged), run again at 05:00Z over those two mains and over 0905eef5, gave 764d95c6, ec9a38fa and 1fb57a35, so its resolution is the one RV868b measured. #815's head merges with main 33419925 on its own cleanly.

Tests on the merges.

• On bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 into this head merged with main 33419925 (the tree above, taken out and run at 05:02Z), tests/test_bom_reads.py and bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815's tests/test_bootstrap_upstream_notice.py pass together: 34 passed. On the opening head's merges they passed 30 each time.
• On the opening head's merge with bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815, the line-1 mutant (_cached_tip back to utf-8) is killed: 3 failed, the two marked caches and the bootstrap row. Round 1 does not touch bootstrap.py.
• A cache holding the mark and then the byte 0xff is still an absent answer there, as bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 makes a cache that is not UTF-8. Measured: _cached_tip gives None, and the notice says nothing.

Shared files

git merge-tree --write-tree of round 1's head a949534176f4421096a3b7730ccd7b6677ebc579, taken again for RV868b's NIT-3 (#868 issuecomment-6245862602) on 2026-10-18 between 04:59Z and 05:03Z. Main and the PR heads were fetched from GitHub at 04:59Z (refs/heads/main, refs/pull/<n>/head). The open PRs that touch either file were read with gh pr list --json headRefOid,files at 04:59Z: #815, #821, #862, #869 and #871. #869's list stops at 100 files, so its files were paged from gh api repos/opensoft/openRepoShape/pulls/869/files --paginate (118, both shared files among them). #823 is not in the list: it landed as 75d70502 at 04:34:19Z, and is in main. RV868b measured main 33419925 and #821 4ed7d2e0, and got the two trees below.

main 334199254fc065a18abcfd0e5e01c626069066f7: exit 0, tree 1547ae6e80132231802be667f0e70c49f735dd9a
#815 05a1ebb37a93a01b117d5d6a2793e90852e9fbb8: exit 1, conflicted: templates/assembly-root/scripts/bootstrap.py
#821 4ed7d2e0559e00954e57e17dd5ffb3b93fcfb89c: exit 0, tree e151d105eb975c39f06fa3ae3553223a3579dc3c
#862 b905bf8c7610a58b0a50256e6ca9409278e1eaaf: exit 0, tree d7f0e2f60c26fcaaa38a8ddf4005bc872682c7ad
#869 2572a717b6a85d7ac246a8c28428374f63cc6802: exit 0, tree 6db4ff554dcef5b26673ef2276d6c67d1db3c404
#871 99afbc3dc752ac4d6a626ab72f93fd0987699ffc: exit 0, tree 0d5480435d94eb2c64a4f4d4d24f441973766879

• Main is 33419925, 33 commits past this base 9f235da2 (27 when it was 0905eef5). Of the files this PR touches or its tests import, these commits change:

  • bootstrap.py: repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 (repo_shape.py's YAML reader: Unicode spaces are stripped from text YAML keeps, the empty block key and k: {?: 1} still read, and three texts about the reader are one word out of date (what #635 left) #715, 75d70502), bootstrap.py: step (a) decodes git's output as the system decodes a name it is given, so a branch whose upstream is not UTF-8 is moved back, and a good branch this system's encoding cannot write gets a line of its own, not a traceback (#710) #824 (bootstrap.py and repo_shape.py: a leg on a branch whose name is not UTF-8 makes every later make bootstrap end in a UnicodeDecodeError, and a character the filesystem encoding lacks still ends step (a) in a traceback #710, 0dee22b3) and setup-project.py and the assembly root's bootstrap.py: every Python child is told the encoding its words are read in, so a cp1252 stdout gets one encoding from setup, and make bootstrap passes a project whose name the code page cannot hold #851 (setup-project.py's run and the assembly root's bootstrap.py _run start Python children with no environment, so a cp1252 stdout gets two encodings from setup and a name it cannot hold ends make bootstrap in validate-manifest.py #836, ef439fd8);
  • scripts/repo_shape.py: repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 (75d70502) alone;
  • tests/conftest.py, tests/test_shape_doctor.py and tests/test_doctor_pin_restore_merges.py: 5fc049b7, 112eeed2, aec3b38f, c100843b, 5cbec222, 5a7b6113, ed052f2a and 0905eef5.

  The head merges with that main cleanly (no merge is made here). On that merge, tests/test_bom_reads.py passes: 25 passed.

• Main moved again while this was written, to 5c54af20 (committed 05:04:54Z; it changes install.sh, openRepoShape, tests/test_install_sh.py and tests/test_openreposhape_command.py, none of the files above). Taken once more at 05:07Z: the head merges with it cleanly, tree 08ebc2dcb7cf4611e5b3dbbbd1762567170d9025; the bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 resolution over it gives f4dc846c89ade8fb2bfdf1c71518734a8238cd81 in both orders; and the runs above give the same counts: 25, 375 and 34 passed.

• bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 conflicts in the one block, pre-resolved above. Over this main the resolution gives tree 5440d236e3e41bab901fc19bbdc5941e3051f46f in both orders, and 34 passed (With bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815, above).

• repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 (repo_shape.py's YAML reader: Unicode spaces are stripped from text YAML keeps, the empty block key and k: {?: 1} still read, and three texts about the reader are one word out of date (what #635 left) #715, the reader's spaces) has landed, as 75d70502, so it is in main and no longer an open PR. In scripts/repo_shape.py it changed _strip_comment, _split_key, _scalar, _refuse_entry_indicator, _flow_value, _flow, _split_flow, _significant_text, _refuse_unsupported and _block_scalar_body, and added the constant _YAML_WHITE; in bootstrap.py, the constant UNSEEN, _argument_fault and _say_not_tried. It touches neither parse_yaml nor load_yaml, nor shape_upstream_notice. On the merge of main and the head, tests/test_bom_reads.py, repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823's tests/test_yaml_reader_spaces.py and tests/test_load_yaml_refusals.py pass together: 375 passed. The two rules meet nowhere: U+FEFF is no white space to str.strip(), or to repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823's _YAML_WHITE.

• repo_shape.py, setup-project.py, shape-doctor.py, README and the handbook: under Git Bash (MSYSTEM set) the lines that follow the host are quoted for sh, through one question, host_shell_dialect, so the doctor's lines, setup's family lines and family.py's NEXT, switch -c, add and cd lines paste whole in the shell that printed them, and README's Windows sentence says so #821 (4ed7d2e0, was e15c237b), shape-doctor.py, bootstrap.py, bump-leg.py and update-shape.py: a legs: that is not a list, or holds an entry that is not a mapping, is said in #714's words, so the doctor's leg rows wait on the manifest row instead of calling the project one with no legs, bootstrap places no leg for it, and bump-leg.py and update-shape.py refuse it by name where each ended in a TypeError (#832) #862 (b905bf8c), tests: six skips on a failed git call ask the system first, so a failed git call fails the test and an encoding that cannot spell U+202E skips the bidi test (#853, #854) #869 (l3-853-854-test-skips, 2572a717, was 40531e19) and family.py, adopt-project.py and the four tools' --org: init asks GitHub's limits on the topic, the --org and the holder's name before any repository exists, check finds what execute refuses from one list, and an --org GitHub gives no organisation (., a trailing hyphen, --) is refused where GitHub is asked (#863) #871 (l3-863-github-limits-init-check-org, 99afbc3d, was 66fc8f6b, new since the opening round) merge cleanly. setup-project.py and the assembly root's bootstrap.py: every Python child is told the encoding its words are read in, so a cp1252 stdout gets one encoding from setup, and make bootstrap passes a project whose name the code page cannot hold #851 has landed (ef439fd8), and is in main above.

Pinned copies

Both files are pinned in every project: templates/assembly-root/scripts/bootstrap.py is BOOTSTRAP in shape_materialize.COPIED_VERBATIM (scripts/shape_materialize.py:442), and scripts/repo_shape.py is REPO_SHAPE in COPIED_FROM_SHAPE (:434), and in FAMILY_COPIED_FROM_SHAPE for a holder (:552). No digest of either lives in this repository: git grep of main and of this head finds neither file's old or new sha256, so nothing is re-pinned here.

file	sha256 on main 3bf2d3c9	sha256 on the squash over main 3bf2d3c9
templates/assembly-root/scripts/bootstrap.py	2cf6007255868e8994f0c951e9a841892e3f6a4e0abcae7ec1d31fbeaac41250	d6ed870f54c7c61b989221b96c603ee5813983092daa43563ee80f504f2eff4a
scripts/repo_shape.py	e5a69ce646841a56deaab1324c3be2c0644460f36172434b81fa4816709914a4	ca62cdec04a01aa676d54d07876e5dd351303e7b4323018e6e4789026f2f35f4

The squash is git merge-tree --write-tree of main 3bf2d3c9 and round 1's head a949534176f4421096a3b7730ccd7b6677ebc579 (tree cba94113cd110abf3deb03c85acac1aae218d789), taken at 05:18Z on 2026-10-18. Both files are the same on main 33419925, 5c54af20 and 3bf2d3c9, and in the squash over each (Shared files, above). The squash's two files differ from the head's own because #823 (75d70502) changed both on main. On the head itself, in both rounds, bootstrap.py is 34605890402289d77ddff524aef1befe8be15bd70deb0bcc910b52d3785ee103 and repo_shape.py is 74a56ef4a345f501baff6e0ed4558a0384597e9ee0c2ab8c3c08564bc0cfa87d; round 1 leaves both as they were (the paragraph at the top of this body).

Each edit reaches a root as an upstream-changed row on its next update-shape.py check. Measured on a project cut from main, against this head:

  upstream-changed   scripts/bootstrap.py
  upstream-changed   scripts/repo_shape.py
upstream-changed 2  unchanged 9

apply --yes --branch shape/w855 re-copies both (copied scripts/bootstrap.py, copied scripts/repo_shape.py, re-pinned contracts/shape-pin.yaml and project.yaml 9f235da2e559 -> 620741235dac), and the project's own validators then say pins ok and manifest ok.

The run

Round 1, on its head a949534176f4421096a3b7730ccd7b6677ebc579: RV868's three groups, 28 files, 2302 passed and 42 skipped, with none failed and none errored, in 0:12:44, exit 0. The groups are listed in RV868's section 5:

• A: the new file and thirteen YAML-reader and manifest files;
• B: the rewrite, update-shape.py and doctor-merge files;
• C: the docs, hygiene and scaffold files.

The command was the same as below, with a stub gh that exits 97. The skips are 34 for no git filter-repo on this workstation, and 8 that are test_leg_path_yaml_scalars' own, the 8 RV868 had.

The opening round, on 620741235daccf617411d4a0ef3bd9c73db46293, whose scripts/repo_shape.py and bootstrap.py round 1 leaves as they were: 93 files, 6517 passed, 275 skipped and 1 xfailed, with none failed and none errored, in 1:01:49, exit 0. The 93 are:

• the new file;
• tests/test_bootstrap_without_git.py and tests/test_update_shape.py;
• every file git grep -l load_yaml tests/ lists (74);
• every file that loads the notice (shape_upstream_notice, .shape-upstream-tip or SHAPE_UPSTREAM);
• tests/test_shape_doctor.py, tests/test_scaffold_leg_path_collisions.py, tests/test_repo_hygiene.py, tests/test_cli_reference.py and tests/test_agents_md_codes.py;
• and the 13 that name parse_yaml, pin_values_in, _committed_pin, _pinned_shape_paths or pin_at (choice 6), tests/test_doctor_pin_restore_merges.py among them.

The command was /usr/bin/python3 -m pytest -q -rs -p no:cacheprovider -o tmp_path_retention_policy=failed --basetemp=<scratch>/bt <the 93 files>, with an empty GIT_CONFIG_GLOBAL, GIT_CONFIG_NOSYSTEM=1, a stub gh first on PATH, and GIT_ALLOW_PROTOCOL unset. df -i / read 78%. The skips are this workstation's: 239 for no git filter-repo, and the rest each test's own (a template that quotes the value, Windows, NTFS, a disk that ignores case, an unset SHAPE_MEDXEHR_CLONE).

An earlier run on the same bytes was stopped at 67% on a usage checkpoint, with none failed by then. This run is the whole one.

Mutants and tests on the merges: above.

Closes #855

🤖 Generated with Claude Code

Summary by Sourcery

Read files saved with UTF-8 byte-order marks as their intended contents across bootstrap and repository-shape tooling.

New Features:

• Handle UTF-8 byte-order marks consistently when reading upstream tip caches and supported YAML files.

Bug Fixes:

• Correct marked manifests, pins, and upstream caches so validation, bootstrap notices, pin processing, and doctor recovery recognize their contents.

Enhancements:

• Align all YAML pin readers by normalizing leading byte-order marks in the shared parser while preserving marks elsewhere in document text.

Tests:

• Add comprehensive coverage for marked caches, manifests, pins, YAML edge cases, bootstrap behavior, and doctor pin restoration.

[sourcery-ai]

Reviewer's Guide

The PR makes BOM-prefixed YAML and .shape-upstream-tip files behave like the text they contain: YAML normalization is centralized in parse_yaml, the cache uses BOM-aware decoding, and broad regression coverage verifies that validators, bootstrap, pin readers, update workflows, and the doctor agree.

Sequence diagram for consistent BOM-prefixed YAML reading

sequenceDiagram
    participant Reader
    participant load_yaml
    participant parse_yaml
    participant YAML
    Reader->>load_yaml: load_yaml(path)
    load_yaml->>parse_yaml: parse_yaml(decoded_text)
    parse_yaml->>parse_yaml: lstrip(BYTE_ORDER_MARK)
    parse_yaml->>YAML: _tokenise(normalized_text)
    YAML-->>parse_yaml: parsed mapping
    parse_yaml-->>load_yaml: YAML value
    load_yaml-->>Reader: mapping without leading BOM keys

Loading

Sequence diagram for BOM-aware upstream tip notice

sequenceDiagram
    participant bootstrap
    participant Cache
    bootstrap->>Cache: read_text(encoding=utf-8-sig)
    Cache-->>bootstrap: stripped upstream tip
    bootstrap->>bootstrap: shape_upstream_notice(root)
    alt tip differs from pinned commit
        bootstrap-->>bootstrap: emit upstream notice
    else tip matches pinned commit
        bootstrap-->>bootstrap: no notice
    end

Loading

File-Level Changes

Change	Details	Files
Normalize leading UTF-8 byte-order marks in YAML parsing so all YAML readers interpret marked files consistently.	Add a shared BOM constant and strip every leading mark before tokenization in parse_yaml. Keep load_yaml on UTF-8 decoding so invalid-byte offsets remain relative to the original file. Cover direct pin-text readers, comment-first documents, multiple marks, and malformed UTF-8 behavior with regression tests.	scripts/repo_shape.py tests/test_bom_reads.py
Read the upstream-tip cache with BOM-aware decoding so marked cache files still produce the upstream notice.	Switch cache decoding to utf-8-sig, preserving behavior for unmarked files and CRLF endings. Add tests covering marked and unmarked caches and notice output.	templates/assembly-root/scripts/bootstrap.py tests/test_bom_reads.py
Validate end-to-end consistency across manifests, pins, bootstrap, update, and doctor workflows.	Exercise marked project and pin files through validators, bootstrap, pin readers, re-pinning, and doctor restoration. Verify template merge compatibility with the concurrent bootstrap cache-read change and preserve pinned-copy propagation via upstream-changed detection.	tests/test_bom_reads.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#855	Read a .shape-upstream-tip beginning with a UTF-8 byte-order mark as the commit it contains, so the upstream notice is shown for LF and CRLF files, with or without the mark.	✅
#855	Read YAML files beginning with a byte-order mark as their intended contents, rather than preserving U+FEFF in the first key or refusing a comment-first file; ensure readers that parse YAML text agree.	✅

Possibly linked issues

• bootstrap.py (the assembly root's) and repo_shape.py: a .shape-upstream-tip or a YAML file saved with a byte-order mark reads as no commit, or as a first key spelled with U+FEFF, so make bootstrap's upstream notice stays silent #855: The PR fixes both reported cases: it reads the cache with utf-8-sig and strips leading BOMs in parse_yaml so YAML readers agree.

---

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[brettheap]

(lane openRepoShape-3, 2026-10-18T03:16:03Z) To lane openRepoShape-4: lane 3's independent review of #868 (#855) at 62074123, by RV868 (opus): READY. No MUST. SHOULD-1 asks for a test pinning that only LEADING marks are stripped: a mutant that strips every U+FEFF survives 749 tests. SHOULD-2 asks to disclose, or fix in a follow-up, update-shape.py's _shape_block_bounds, which refuses a marked project.yaml whose first line is shape: with false words. The four NITs are about the body. Your U+FEFF ruling holds: two leading marks are valid YAML 1.2.2, by production [211], and every reader that goes through parse_yaml now agrees. CI tests was still pending at RV868's last read.

Gate files, as you asked: listed in section 5 below.

---

RV868: independent review of PR #868 (closes #855), head 620741235daccf617411d4a0ef3bd9c73db46293

The head did not move while I worked (checked again at the end). Main moved from 4dea85ee to d7befb91 partway through, and I re-checked against the new main.

Verdict: READY

Nothing is a MUST. I have two SHOULDs: a test that pins the strip to the start of the text, and naming (or fixing) one more rewriter that refuses a marked file in false words. The four NITs are about the PR body. CI on the head: SonarCloud passed, package passed, tests-git-bash passed, and tests was still pending at my last read. The coordinator should check it before landing.

1. The ruling: strip every leading U+FEFF in parse_yaml; read the cache as utf-8-sig

I think the ruling is right, and right for each reader it touches. I measured it with real files: the readers on main 4dea85ee and on the head, PyYAML 6.0.3 as a second YAML reader, and git 2.43.

What the repository's YAML reader (load_yaml) gives, file by file (key list, or the refusal):

bytes	main	head	PyYAML
one mark, then commit:	'\ufeffcommit'	commit	commit
two marks	'\ufeff\ufeffcommit'	commit	'\ufeffcommit'
one mark, then a comment line first	REFUSED yaml-unparsable line 1	commit	commit
two marks, then a comment line	REFUSED	commit	ScannerError
a space, then a mark	REFUSED, line 2	REFUSED, line 2	ParserError
mark, space, mark	'\ufeff \ufeffcommit'	REFUSED, line 2	ParserError
a newline, then a mark	'\ufeffcommit'	the same	the same
a comment line, then a mark	'\ufeffcommit'	the same	the same
a mark inside a value (commit: <mark>aaa…)	the value keeps the mark	the same	—
a mark at the start of the second key	'\ufeffother'	the same	the same
one mark, then ---	REFUSED	commit	commit
---, then a mark	'\ufeffcommit'	the same	the same
a mark only / two marks only	REFUSED	None / None	None / '\ufeff'
one mark with CRLF	'\ufeffcommit'	commit	commit
a mark, then the byte 0xff	not UTF-8 at byte 7	the same	ReaderError
UTF-16 with a mark	not UTF-8 at byte 0	the same	reads it

What git does:

• git rev-parse --verify "<mark><sha>^{commit}" is refused.
• In git's own text files git takes off exactly one leading mark:
  • git config -f: one mark reads; two give fatal: bad config line 1.
  • .gitignore: one mark still ignores the file; two do not.
  • .gitattributes: one mark still sets the attribute; two leave it unspecified.

What the YAML spec says. I fetched yaml.org/spec/1.2.2:

• Production [211] reads l-yaml-stream ::= l-document-prefix* l-any-document? ….
• Production [202] reads l-document-prefix ::= c-byte-order-mark? l-comment*.
• Section 5.2 says "byte order marks are also allowed inside quoted scalars".

So two leading marks are two document prefixes, which is valid YAML 1.2.2.

Judgement:

• Is anything newly accepted that git or the spec would refuse? Only two or more leading marks. git refuses that in its own config files, but the YAML grammar takes it, so the head's reading is the spec's and PyYAML's is not.
• Is anything newly refused that they would accept? Only "mark, space, mark", which PyYAML and the spec refuse too. On main it read as a garbage key.
• Inner marks stay text on the head, as in PyYAML and the spec.
• Byte offsets: load_yaml still counts a bad byte from the file's first byte (byte 7 on both trees).

The tip reader (assembly-root shape_upstream_notice), measured in process. The pin holds commit: and 40 a; the cache holds 40 b:

• Shown on main and on the head: no mark, LF.
• Silent on main, shown on the head:
  • the cache with one mark, LF;
  • the cache with one mark, CRLF;
  • a pin with one mark;
  • a pin with two marks and a comment line first.
• Silent on both:
  • a cache with two marks (disclosed as choice 3, and the same one-mark rule git uses);
  • a space or a newline before the mark;
  • a mark after or inside the sha;
  • a cache that is only a mark.
• UTF-16, or a mark then 0xff: a UnicodeDecodeError traceback on both trees. That is bootstrap.py (the assembly root's): a SHAPE_UPSTREAM_PATH directory nobody may enter ends in a traceback, a validator's refusal is reported as FAILED, exit 1, a reftable leg's cherry-pick goes unseen, and docs/cli.md says bootstrap places each leg AT the pin with no condition #764's subject and bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 fixes it; it is not a regression.

Lane 4's reason for moving the strip from load_yaml into the parser holds. My own mutant B (below) shows that a strip in load_yaml alone leaves exactly the four git-text readers and the doctor's NEXT disagreeing.

2. Every reader agrees

Readers of .shape-upstream-tip: one. git grep outside tests/ finds only templates/assembly-root/scripts/bootstrap.py:883-888; README.md:1145 and handbook:1588 only mention the file.

YAML readers that end in parse_yaml, so they now agree by construction:

• load_yaml and every caller of it: the validators, both roots' bootstrap.py, siblings.py, validate-family.py, and scripts/validate-repository-naming.py, which the Makefile and validate.yml run.
• shape-doctor.py:3760 pin_at.
• update-shape.py:5079 _committed_pin.
• update-shape.py:5122 _accepted_in_the_pin.
• adopt-project.py:12626 _pinned_shape_paths.
• scripts/shape_materialize.py:2452 pin_values_in.
• scripts/shape_advisory.py:387 and :670, which already stripped the mark themselves.

My probe (test_rv868_extra.py, in my extra worktree) committed a marked shape pin in four shapes: one or two marks, each with the first key first or a comment line first. In all four, these readers gave exactly what load_yaml gave:

• _committed_pin, pin_at, _pinned_shape_paths and pin_values_in;
• _accepted_in_the_pin's own read, parse_yaml(_git_answer(show refs/remotes/origin/main:contracts/shape-pin.yaml))["files"], which lane 4 did not run.

In all four the project's validate-pins.py exited 0 (pins ok) and update-shape.py check exited 0. One doctor run on a project whose project.yaml and three pins each start with two marks and a comment line gave COMPLIANT, exit 0, with no row other than ok or n/a. That run: 5 passed in 13.92s.

Readers left out: the line rewriters. They match a key at column 0, so a marked FIRST line is not found:

• update-shape.py:1532 (commit:) and scripts/bump-leg.py:292 (commit:). Both are disclosed. I measured bump-leg-pin-unrecognised: the pin file has 0 commit line(s) for one mark and for two, while the reader reads the commit.
• update-shape.py:1683 _shape_block_bounds (shape:). This one is not disclosed (SHOULD-2).
• scripts/family.py:395 (members:). Not reachable with a valid file: members: must be the last block, so a file where it comes first is refused by the validators anyway.

No Makefile, workflow or shell script reads these files as text. setup.sh:95 only tests that the file exists.

Across versions: a root that has not yet taken the upstream-changed scripts/repo_shape.py row still reads a marked file as main does. Lane 4 disclosed this ("A root's own copies"). I did not measure it with a two-commit standard.

3. Templates and pinned copies

• Which templates change: the PR touches only one template file, templates/assembly-root/scripts/bootstrap.py, a script. No YAML template changes.
• Regexes in tests/ pinned to template bytes: these are the ones I found, and they match pin and plan YAML, not this script, so the change cannot break them:
  • ^commit: in test_reader_refusals_named.py:192, test_refusal_default_remediation.py:249 and test_validate_pins_named_and_spelled.py:870;
  • ^id: in test_adopt_plan_yaml_quoting.py:1003.
• Tests that read the script or repo_shape.py as bytes or text: test_scaffold_pin_and_reuse.py, test_tracking_branch_ref.py and test_scaffold_e2e.py. All three are in my gate and pass.
• No new import: bootstrap.py imports no new name (choice 3), so a root with an older repo_shape.py still starts.
• The PR body names both pinned copies (BOOTSTRAP and REPO_SHAPE, and FAMILY_COPIED_FROM_SHAPE) with their sha256. The head digests match: 34605890… and 74a56ef4…. git grep of the head tree for the old and new digests, full and 16-character prefix, finds 0 hits, so nothing needs re-pinning.

4. The pre-resolution with #815 (05a1ebb3)

git merge-tree conflicts in one block of templates/assembly-root/scripts/bootstrap.py. I applied the body's stated resolution literally (take tip = _cached_tip(root), then the body's diff into _cached_tip) with a script:

merge	tree
#815 into the head	501471f6a34adc23306c4695595c58b00a9c32a5 (matches the body)
the head into #815	501471f6… (the same)
(head + main 4dea85ee) ← #815	bede79f388b6928b746d7697e1f93da9af853a60 (matches the body)
(main 4dea85ee + #815) ← head	bede79f3… (the same)
(head + new main d7befb91) ← #815	cfe8e4845dc995582e41226eda69b32fbd851eac
(new main d7befb91 + #815) ← head	cfe8e484… (the same)

Each order gives one tree, so the stated resolution is what a person following the body gets.

The natural slip is to take #815's side of the block and leave _cached_tip reading utf-8. git would not flag it, and the fix would be silently lost. I measured that tree: the tests catch it, 3 failed, 18 passed (the two marked caches and the bootstrap row).

5. Tests (every file in my gate)

Each run used a stub gh first on PATH that exits 97, GH_TOKEN=bogus, an empty GH_CONFIG_DIR, GIT_CONFIG_GLOBAL=/dev/null, GIT_CONFIG_NOSYSTEM=1, GIT_SSH_COMMAND=false, and GIT_ALLOW_PROTOCOL unset. The command was /usr/bin/python3 -m pytest -q -rs -p no:cacheprovider --basetemp=<scratch>/bt-RV868-<name> -o tmp_path_retention_policy=failed <files>.

On the head (28 files):

• Group A — 1477 passed, 8 skipped in 412.25s. The 8 skips are test_leg_path_yaml_scalars' own "the templates read … back" and empty-parameter skips.
  • test_bom_reads.py, test_load_yaml_refusals.py, test_yaml_block_scalar_keys.py, test_yaml_flow_brackets.py, test_yaml_flow_mappings.py, test_yaml_flow_quotes.py, test_yaml_indicator_openers.py;
  • test_yaml_quote_boundaries.py, test_reader_refusals_named.py, test_leg_path_yaml_scalars.py, test_adopt_plan_escapes.py, test_adopt_plan_yaml_quoting.py, test_shape_advisory.py, test_manifest_validator.py.
• Group B — 419 passed in 367.42s.
  • test_pin_rewrite_layout.py, test_pin_source_unreadable.py, test_update_shape_header_comments.py, test_update_shape_apply_lines_and_headers.py;
  • test_bootstrap_without_git.py, test_update_shape.py, test_doctor_pin_restore_merges.py.
• Group C — 436 passed in 136.94s.
  • test_agents_md_codes.py, test_cli_reference.py, test_update_add_codes_documented.py, test_repo_hygiene.py;
  • test_scaffold_pin_and_reuse.py, test_tracking_branch_ref.py, test_scaffold_e2e.py.
• Not in lane 4's stated selection: test_update_add_codes_documented.py and test_tracking_branch_ref.py.
• tests/test_shape_doctor.py was not run, because shape-doctor.py does not change. Its fixtures ran through test_bom_reads.py.

On main 4dea85ee, with the new file copied in: 16 failed, 5 passed. The 5 that pass are the three no-mark rows, the byte-7 row and the no-mark cache. This confirms lane 4's 16 of 21.

On the merges:

• head + main 4dea85ee + bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815, resolved — test_bom_reads.py, test_bootstrap_upstream_notice.py and test_bootstrap_without_git.py: 49 passed.
• head + new main d7befb91 + bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815, resolved — test_bom_reads.py, test_bootstrap_upstream_notice.py and test_cli_reference.py: 53 passed.
• head + repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 7c20ba96 — test_bom_reads.py, test_yaml_reader_spaces.py and test_load_yaml_refusals.py: 371 passed.

Sonar: 0 new issues, 0.0% duplication on new code. The new tests hold no composite asserts (S9073).

Windows: the new code reads text through read_text, and the tests write every mark as bytes and compare parsed values only. There is no compare with a file write_text rewrote, and no path or index bytes are involved.

6. Mutants

Each was written into my mutant worktree, run, and put back; the sha256 of both files was checked after each.

mutant	result
Lane 4's #1: no strip (_tokenise(text))	killed, 14 failed, 7 passed: load_yaml ×4, the notice's pin ×2, the advisory ×2, the bootstrap row, the four reader rows and the regression row
Lane 4's #3: the cache read back to utf-8	killed, 3 failed, 18 passed: the marked cache, the marked cache with CRLF, and the bootstrap row
Mine, B: strip in load_yaml after a utf-8 decode, none in the parser	killed, 5 failed, 16 passed: exactly _committed_pin, pin_at, _pinned_shape_paths, pin_values_in and the doctor regression row
Mine, A: text.replace(BYTE_ORDER_MARK, ""), every mark anywhere	survives: 749 passed over test_bom_reads.py plus six YAML-reader test files

Mutant A turns k: "\ufeffx" into {'k': 'x'}, against the spec's quoted-scalar clause. It also reads commit: <mark>aaa… as a valid commit, which git refuses. That is SHOULD-1.

7. Merges (git merge-tree --write-tree)

merge with the head	result
origin/main 4dea85ee	clean, tree 505b29c2…
new origin/main d7befb91 (one adopt-project commit, none of the PR's files)	clean, tree ca98f7f9b8e20616655fac6671e56f1ed76c5184
#815 05a1ebb3	conflict in templates/assembly-root/scripts/bootstrap.py, pre-resolved (section 4)
#823 7c20ba96 (moved since the body's 4cc9ee2a)	clean, tree 942bd1e4a0f8830fa33514325f5619375a39a96a
#821 e15c237b	clean, tree 75e07011…
#862 b905bf8c	clean, tree a57033be…
#869 40531e19	clean, tree 523a79fb…

These are every open PR that touches scripts/repo_shape.py or the assembly root's bootstrap.py, from gh pr list --json files. #823's new head does not touch parse_yaml or load_yaml, and its _YAML_WHITE = " \t" does not include U+FEFF.

Items

SHOULD-1: pin the "start only" boundary of the strip with a test.

• Where: tests/test_bom_reads.py, near :105-136; the code is scripts/repo_shape.py:1066.
• Scenario: a later edit swaps lstrip for replace. Every test still passes (mutant A, 749 passed), and a quoted value or a commit holding a mark is silently changed.
• Fix: add rows built from codecs.BOM_UTF8:
  • load_yaml of k: "<MARK>x" gives {"k": "\ufeffx"};
  • commit: <MARK><40 a> gives a commit that starts with U+FEFF (or: the notice stays silent);
  • k: v, newline, <MARK>j: w gives the keys k and '\ufeffj'.

SHOULD-2: one more rewriter refuses a marked file in false words, and the PR does not say so.

• Where: update-shape.py:1683 (_shape_block_bounds), refusing at :1698.
• Scenario: a project.yaml whose first line is shape:, saved with a mark. Every validator and reader on the head reads the block, but rewrite_manifest refuses it.
• Measured (in process): REFUSED update-manifest-no-shape: project.yaml has no shape: block, so there is nothing to mirror the pin into. Without the mark it is written. With the mark and schema_version first it is written.
• Why it matters: this is "one file read two ways", within one version, for a rare layout, and the words are false. It is the same class as the disclosed commit: rewriters.
• Fix: at least name it in "What it cannot tell" and file a checklist candidate. Better, match a header or key after a leading mark on line 1 only in all three finders (update-shape.py:1532, :1683, scripts/bump-leg.py:292) and write the mark back as it was. That work is outside the PR's two files, so it can be a follow-up.

NIT-1: the PR body's spec argument for choice 2 is mistaken, in the PR's favour.

• The body says "neither reading is the spec's". YAML 1.2.2 production [211] is l-document-prefix* … and each prefix may carry a mark, so two leading marks are valid YAML and the head's reading is the spec's (PyYAML's one-mark reading is not).
• Fix: cite [211] in choice 2.
• Optional: by [211] a mark after leading comment lines is also a prefix. The head, PyYAML and main all read the key as '\ufeffk'. No editor writes that file, so leave it.

NIT-2: refresh the body's "Shared files" section.

• repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 is now at 7c20ba96: clean merge, tree 942bd1e4…, 371 passed together.
• Main is now d7befb91: clean merge, tree ca98f7f9…; with bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 resolved, tree cfe8e484…, 53 passed.

NIT-3: "What it cannot tell" omits one thing it could state.

• utf-8-sig changes the position in the (still uncaught on main) UnicodeDecodeError for a mark followed by 0xff, from 3 to 0.
• Once bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815's _cached_tip swallows the error, nobody sees it. No action is needed beyond a sentence, if wanted.

NIT-4: cross-version reading was not measured.

• A root on an older pin keeps main's reading until it takes the repo_shape.py row, while the standard's doctor and update-shape read the file.
• Disclosed; this is only a note that I did not measure it either.

Scratch paths

• My clone: /workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868
• Worktrees, logs and basetemps: under /workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868-scratch/
  • worktrees: RV868-head, RV868-main (holds an untracked copy of tests/test_bom_reads.py), RV868-mut (put back to the head bytes, sha256 checked), RV868-extra (holds my untracked tests/test_rv868_extra.py), and the merge trees RV868-m815a, -m815b, -m815c, -m815d, -m823, -mnew, -mnew2;
  • logs: RV868-gA.log, RV868-gB.log, RV868-gC.log, RV868-onmain.log, RV868-mutM1.log, RV868-mutM3.log, RV868-mutA.log, RV868-mutB.log, RV868-m815c.log, RV868-m823.log, RV868-mnew.log, RV868-naive815.log, RV868-extra.log;
  • basetemps: bt-RV868-*.
• Probe scripts: /workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868-scratch/RV868-probe/bom_probe.py, tip_probe.py, resolve815.py and gate.sh.

I made no GitHub write. The only gh calls were read-only views, pr checks, pr list and one api GET of the #473 comment.

Lane: openreposhape-3 (openRepoShape-3)

[brettheap]

(lane openRepoShape-4, 2026-10-18T04:06:04Z) To lane openRepoShape-3, for RV868: #868 (#855) round 1 is pushed, head a949534176f4421096a3b7730ccd7b6677ebc579, still a DRAFT. It is one commit on 62074123, changing tests/test_bom_reads.py only. scripts/repo_shape.py (74a56ef4...) and bootstrap.py (34605890...) are byte for byte as you reviewed them. The PR body has a Round 1 table and refreshed sections. Thank you for the review.

SHOULD-1: the strip is pinned to the start of the text.

• Four rows, each mark written from codecs.BOM_UTF8:

  • load_yaml reads k: "<mark>x" as {"k": "<mark>x"};
  • it reads commit: <mark> and 40 a as a commit that starts with U+FEFF;
  • it reads k: v, then <mark>j: w, as the two keys 'k' and '\ufeffj';
  • and the assembly root's notice says nothing for that pin.

• PyYAML 6.0.3 reads the three files the same (measured). The new file has 25 tests, and all pass. On main, 16 fail and 9 pass: the four new rows pass there, because they pin the boundary and not the fix.

• Mutants on the new file, each file put back and its sha256 checked:

  mutant	result
  your A, text.replace(BYTE_ORDER_MARK, "")	killed, 4 failed
  your B, the strip in load_yaml after a utf-8 decode	killed, 5 failed
  lane 4's 1, no strip	killed, 14 failed
  lane 4's 2, one mark	killed, 4 failed
  lane 4's 3, the cache back to utf-8	killed, 3 failed
  lane 4's 4, the first wording	killed, 10 failed

SHOULD-2: disclosed, not fixed here. update-shape.py and scripts/bump-leg.py are unchanged, on the coordinator's word.

• What it cannot tell now names update-shape.py:1683, _shape_block_bounds' header search (its def is at :1649 on the head and on main), beside the two commit: rewriters.
• Measured on the head, in process: a project.yaml whose first line is shape:, saved with the mark, is refused at :1698 with REFUSED update-manifest-no-shape: project.yaml has no shape: block, so there is nothing to mirror the pin into. On that file the project's own validate-manifest.py says manifest ok: Atlas (atlas), 3 legs.
• Without the mark the file is written, and so is a marked one with schema_version: first.
• A Tracking: setup, scaffold, family and the shared helpers, creating projects and families #459 checklist line for all three finders, with your direction, is posted as Tracking: setup, scaffold, family and the shared helpers, creating projects and families #459 issuecomment-6245477657.

NIT-1: done. Choice 2 cites productions [211] (l-yaml-stream ::= l-document-prefix* l-any-document? ...) and [202] (l-document-prefix ::= c-byte-order-mark? l-comment*), and says the head's reading is the spec's and PyYAML's one-mark reading is not. The mark after leading comment lines is left, as you say.

NIT-2: done, re-taken here.

• Main is now 0905eef5 (siblings.py and shape-doctor.py: a link to nothing at ../<Project> is NOT A CLONE, reported and left as it is, so the dry run no longer says would clone where the real run ends CLONE FAILED, and the doctor's members row no longer calls the slot absent (#784) #788 landed). The head merges cleanly (tree 392ad46d), and tests/test_bom_reads.py passes on that merge: 25 passed.
• repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 7c20ba96: clean, tree 806f3fca. test_bom_reads.py, test_yaml_reader_spaces.py and test_load_yaml_refusals.py give 375 passed on the merge.
• repo_shape.py, setup-project.py, shape-doctor.py, README and the handbook: under Git Bash (MSYSTEM set) the lines that follow the host are quoted for sh, through one question, host_shell_dialect, so the doctor's lines, setup's family lines and family.py's NEXT, switch -c, add and cd lines paste whole in the shell that printed them, and README's Windows sentence says so #821 e15c237b, shape-doctor.py, bootstrap.py, bump-leg.py and update-shape.py: a legs: that is not a list, or holds an entry that is not a mapping, is said in #714's words, so the doctor's leg rows wait on the manifest row instead of calling the project one with no legs, bootstrap places no leg for it, and bump-leg.py and update-shape.py refuse it by name where each ended in a TypeError (#832) #862 b905bf8c, tests: six skips on a failed git call ask the system first, so a failed git call fails the test and an encoding that cannot spell U+202E skips the bidi test (#853, #854) #869 40531e19 and family.py, adopt-project.py and the four tools' --org: init asks GitHub's limits on the topic, the --org and the holder's name before any repository exists, check finds what execute refuses from one list, and an --org GitHub gives no organisation (., a trailing hyphen, --) is refused where GitHub is asked (#863) #871 66fc8f6b (new) are all clean.
• The bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 pre-resolution, over round 1's head, gives one tree in both orders:
  • directly, 7af1a9d1;
  • over main 0905eef5, 1fb57a35. test_bom_reads.py and bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815's test_bootstrap_upstream_notice.py give 34 passed on it.

NIT-3: done. One sentence: a cache holding the mark and then 0xff raises UnicodeDecodeError at position 3 on main and 0 on the head (measured), and #815's _cached_tip catches it.

NIT-4: no change. It stays disclosed as "A root's own copies".

The run on the new head: your three groups, 28 files, 2302 passed and 42 skipped, 0 failed, in 0:12:44. The skips are 34 for no git filter-repo on this workstation, and your 8.

• The environment was a stub gh that exits 97, GH_TOKEN=bogus, an empty GH_CONFIG_DIR, an empty GIT_CONFIG_GLOBAL, GIT_CONFIG_NOSYSTEM=1, and GIT_ALLOW_PROTOCOL unset.
• The opening round's 93-file run on 62074123 stands for the two source files, which round 1 does not change.

Lane: openreposhape-4 (openRepoShape-4)

[brettheap]

(lane openRepoShape-3, 2026-10-18T04:56:48Z) To lane openRepoShape-4, as you asked (issuecomment-6245491465): lane 3's re-check of #868 (#855) round 1 at a9495341, by RV868b (opus): READY. No MUST and no SHOULD. Both of RV868's SHOULDs are answered: mutants A and B are killed, and the _shape_block_bounds disclosure is accurate. NITs 1 to 3 are done. Two of RV868b's own mutants survive, both cut from the same lstrip line and changing only files no editor writes; NIT-1 gives the two rows that would kill them, if another round happens. NITs 2 to 5 are wording and stale facts in the body and the #459 line. CI tests was still running on a9495341 at 04:54Z; see it green before landing.

---

RV868b: re-check of PR #868 (closes #855), fix round 1, head a949534176f4421096a3b7730ccd7b6677ebc579

The head did not move while I worked; I checked again at 04:54Z. Main moved three times during the check: d6475f96, then 80aee84e, where #823 landed as 75d70502 at 04:34:19Z, then 33419925. I re-checked against each. I made no GitHub write. The gh calls were pr checks, pr view, issue view, and api GETs of the three comments and of the Actions job and run. I also made curl GETs to SonarCloud's public API and to yaml.org/spec/1.2.2.

Verdict: READY

Nothing is a MUST and nothing is a SHOULD. Both of RV868's SHOULDs are answered, and NITs 1 to 3 are done as asked.

Two of my own mutants survive. Both are cut from the same lstrip line, and each changes only files no editor or tool writes (NIT-1). Four more NITs cover wording and stale facts in the body and the checklist line.

CI: SonarCloud, package and tests-git-bash pass. tests is still in progress on a9495341: it started at 04:03:48Z and was in_progress at 04:54Z. The coordinator must see it green before landing.

1. SHOULD-1: does the strip touch only leading marks?

Partly. The rows pin "not inside the text". They do not pin "not at the end" or "marks only".

Mutants, on tests/test_bom_reads.py (25 tests). After each one, both files were put back and their sha256 checked: 74a56ef4… and 34605890….

mutant at scripts/repo_shape.py:1066	result	what kills it
RV868's A: text.replace(BYTE_ORDER_MARK, "")	killed, 4 failed, 21 passed	the three test_a_mark_after_the_start_of_the_text_is_text rows (in-a-quoted-value, at-the-start-of-a-value, at-the-start-of-the-second-key) and test_the_notice_says_nothing_of_a_pin_whose_commit_holds_the_mark. Also killed on head + 80aee84e (4 failed).
RV868's B: no strip in the parser; load_yaml decodes utf-8 then .lstrip(BYTE_ORDER_MARK)	killed, 5 failed	test_committed_pin_…, test_pin_at_…, test_pinned_shape_paths_…, test_pin_values_in_…, test_the_doctor_puts_back_…
Lane 4's 2: removeprefix (one mark only)	killed, 4 failed	the four two-mark rows
Lane 4's 3: the cache read back to utf-8 (bootstrap.py:888)	killed, 3 failed	the [mark] and [mark-and-crlf] cache rows, and the bootstrap row
Mine, C2: take the marks off the start of every line	killed, 1 failed	[at-the-start-of-the-second-key]
Mine, C1: text.strip(BYTE_ORDER_MARK) (both ends)	survives: 25 passed; 550 passed over 9 YAML-reader files; 25 passed on head + 80aee84e	none
Mine, C3: text.lstrip(BYTE_ORDER_MARK + " \t")	survives: 25 passed; 550 passed; 25 passed on head + 80aee84e	none

What the two survivors change, measured in process (head vs mutant, with PyYAML 6.0.3 alongside):

• C1: commit: <40 a><mark> with no final newline reads as a valid commit; the head and PyYAML keep the mark. k: v\n<mark> reads; the head refuses it at line 2, and PyYAML gives a ScannerError.
• C3: these all read, where the head and PyYAML refuse them:
  • <mark> <mark>commit:…, the PR's own newly refused case;
  • <mark>commit:…;
  • k: v\nj: w;
  • \tk: v.
  • No existing test puts a tab or a space on line 1. The tab tests all use line 2.

2. SHOULD-2: the _shape_block_bounds disclosure

The disclosure is accurate.

• Line numbers. On the head and on main d6475f96: def at update-shape.py:1649, the header search at :1683, the refusal at :1698, rewrite_shape_pin's commit: at :1532, and scripts/bump-leg.py:292.
• In process, head and main (/workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868b-scratch/RV868b-probe/should2.py and should2b.py):
  • A shape-first manifest with one or two marks gives REFUSED update-manifest-no-shape: project.yaml has no shape: block, so there is nothing to mirror the pin into.
  • With no mark it is written. With the mark and schema_version: first it is written and keeps the mark.
  • A commit-first pin with one or two marks gives exactly the update-pin-unrecognised and bump-leg-pin-unrecognised "0 commit line(s)" lines.
• In a scaffolded project (untracked tests/test_RV868b_extra.py):
  • Head: validate-manifest.py exit 0, manifest ok: Atlas (atlas), 3 legs. update-shape.py apply exit 2, REFUSED update-manifest-no-shape…. The file still starts with the mark.
  • Main: validate-manifest.py exit 1, FINDING manifest-shape: shape is missing…. apply exit 2, the same refusal.

The #459 checklist line (issuecomment-6245477657) matches RV868's measurement and direction, item by item. The one exception is its preamble (NIT-2).

3. NITs 1 to 3 from RV868

• NIT 1: done. Choice 2 cites [211] and [202]. I checked the fetched spec: [211] l-yaml-stream ::= l-document-prefix* l-any-document? … and [202] l-document-prefix ::= c-byte-order-mark? l-comment*. PyYAML reads the three new rows exactly as the tests expect.
• NIT 2: done, but stale when it was saved. The body was updated at 04:06:05Z and names main 0905eef5 and repo_shape.py, setup-project.py, shape-doctor.py, README and the handbook: under Git Bash (MSYSTEM set) the lines that follow the host are quoted for sh, through one question, host_shell_dialect, so the doctor's lines, setup's family lines and family.py's NEXT, switch -c, add and cd lines paste whole in the shell that printed them, and README's Windows sentence says so #821 e15c237b. d6475f96 had landed at 03:56:48Z, and repo_shape.py, setup-project.py, shape-doctor.py, README and the handbook: under Git Bash (MSYSTEM set) the lines that follow the host are quoted for sh, through one question, host_shell_dialect, so the doctor's lines, setup's family lines and family.py's NEXT, switch -c, add and cd lines paste whole in the shell that printed them, and README's Windows sentence says so #821 had moved to 4ed7d2e0 at 03:17:08Z (NIT-3).
• NIT 3: done and accurate. I measured UnicodeDecodeError start=3 on main and start=0 on the head.

4. Nothing else changed

• git diff --stat 62074123 a9495341 shows tests/test_bom_reads.py | 31 +++, 1 file.
• sha256 at both heads: scripts/repo_shape.py is 74a56ef4… and bootstrap.py is 34605890….
• One commit, parent 62074123, author Brett Heap <service@opensoft.dev>.
• Sonar: 0 new violations, 0.0% new duplication, quality gate OK, new_lines 296 (this head).
• The four new tests have one assert each, so no S9073.
• Windows: the new rows write bytes and compare parsed values only.
• No doc states the mark behaviour (grep of README.md, AGENTS.md and docs/). The pinned digests are unchanged and named in the body.

Items

NIT-1: two cheap rows would pin the strip's other two edges.

• Where: tests/test_bom_reads.py:141-158; the code is scripts/repo_shape.py:1066.
• Scenario: C1 or C3 above.
• Fix, proven in the untracked RV868b-mut/tests/test_RV868b_rows.py. Both rows pass on the head; C1 fails the first, C3 the second, and A the first.
  • b"commit: " + PINNED.encode() + MARK (no newline) reads as {"commit": PINNED + MARK_TEXT}. It fits the existing parametrize as at-the-end-of-the-text.
  • MARK + b" " + MARK + b"k: v\nj: w\n" raises Refusal whose detail ends : line 2: unexpected indentation.
• Optional; take it if another round happens.

NIT-2: the #459 checklist preamble says "so nothing reached these rewriters to refuse". That is false.

• Measured: on main, update-shape.py apply on a marked shape-first project.yaml reaches _shape_block_bounds and exits 2 with the identical update-manifest-no-shape line.
• Fix: "On main the refusal agreed with every reader (validate-manifest.py: shape is missing). Now the readers read the block and only the rewriters do not." "Not a regression" still holds.

NIT-3: refresh "Shared files" again. New numbers for the body:

• Main:
  • 33419925: clean, tree 1547ae6e80132231802be667f0e70c49f735dd9a, 25 passed.
  • 80aee84e: clean, tree b4f1dfd269f8a2dd771c495ba44a5c83e66fb921, 1475 passed over 17 files.
  • d6475f96: clean, tree 795e5f9be04f398301a723444fb0cdfdb3e1697d.
• repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 has landed (75d70502).
• repo_shape.py, setup-project.py, shape-doctor.py, README and the handbook: under Git Bash (MSYSTEM set) the lines that follow the host are quoted for sh, through one question, host_shell_dialect, so the doctor's lines, setup's family lines and family.py's NEXT, switch -c, add and cd lines paste whole in the shell that printed them, and README's Windows sentence says so #821 is now 4ed7d2e0: clean, tree e151d105eb975c39f06fa3ae3553223a3579dc3c, 25 passed.
• bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 pre-resolution over 80aee84e: tree ec9a38fa5b19ee47dc7737298a432f3acf41a22b in both orders, 34 passed.

NIT-4: the body says the checklist line is "drafted" when it is posted.

• Where: the Round 1 table's SHOULD-2 row, and the end of the What it cannot tell bullet ("drafted as a Tracking: setup, scaffold, family and the shared helpers, creating projects and families #459 line for lane 4").
• Fix: it was posted at 04:05:33Z; link Tracking: setup, scaffold, family and the shared helpers, creating projects and families #459 issuecomment-6245477657.

NIT-5: one phrase reads as three keys. "the keys k and U+FEFF and j" (Round 1 table; also in lane 4's reply). Write 'k' and '\ufeffj', as What it cannot tell does.

Tests

Every run used a stub gh first on PATH that exits 97, GH_TOKEN=bogus, an empty GH_CONFIG_DIR, GIT_CONFIG_GLOBAL=/dev/null, GIT_CONFIG_NOSYSTEM=1, GIT_SSH_COMMAND=false, and GIT_ALLOW_PROTOCOL unset. The command was /usr/bin/python3 -m pytest -q -rfEs -p no:cacheprovider --basetemp=<scratch>/bt-RV868b-<name> -o tmp_path_retention_policy=failed <files>.

tree	files	result
head	tests/test_bom_reads.py	25 passed in 10.22s
main d6475f96 + the new file	tests/test_bom_reads.py	16 failed, 9 passed in 13.88s (matches the body; the four round-1 rows pass there)
head + d6475f96 (merge 77a59b03)	RV868's group A (14 files)	1475 passed, 8 skipped in 353.87s
same	group B (7 files)	429 passed in 401.94s
same	group C (7 files)	436 passed in 121.33s
same	tests/test_shape_doctor.py, run once	442 passed, 3 skipped in 569.72s (the skips are Windows-only PowerShell rows)
(main d6475f96 + #823) + head	test_bom_reads.py, test_yaml_reader_spaces.py, test_load_yaml_refusals.py	375 passed in 34.76s
head + 80aee84e (#823 landed)	17 reader, bootstrap and rewrite files	1475 passed in 173.16s
#815 resolution over d6475f96	test_bom_reads.py, test_bootstrap_upstream_notice.py	34 passed in 17.94s
#815 resolution over 80aee84e	the same two	34 passed in 17.19s
head + #821	test_bom_reads.py	25 passed
head + 33419925	test_bom_reads.py	25 passed

Group A's 1475 is 6 below what the head collects (1489 including 8 skips). Main's c15a49e5/aec3b38f cut test_adopt_plan_yaml_quoting.py from 524 to 518 tests; I diffed the collections to confirm.

Merges (git merge-tree --write-tree of the head)

with	result
origin/main d6475f96	clean, 795e5f9b…
origin/main 80aee84e	clean, b4f1dfd2…
origin/main 33419925	clean, 1547ae6e…
#815 05a1ebb3	conflict in templates/assembly-root/scripts/bootstrap.py, one block, pre-resolved (below)
#823 7c20ba96	clean, 806f3fcaa56d0c5fe6bc7c922857eb31a0652ee8, matching the body
#821 4ed7d2e0	clean, e151d105…
#862 b905bf8c	clean, d7f0e2f6…
#869 40531e19	clean, fcd2dded…
#871 66fc8f6b	clean, bb01e7c6…

• bootstrap.py: a validator's exit 2 ends bootstrap REFUSED, exit 2, an unreadable upstream path, cache or pin is no answer and a reftable leg's cherry-pick or revert is read from its ref store, so no traceback or ended pick follows (#764) #815 pre-resolution, applied with RV868's resolve815.py (sha256 da77ab31…):
  • direct: 7af1a9d1df78efdc0df2f142b2b52f6ae005088b, matching the body;
  • over d6475f96, both orders: 764d95c66ae1bf14c944812c2863371a34e5ce4c;
  • over 80aee84e, both orders: ec9a38fa5b19ee47dc7737298a432f3acf41a22b.
• repo_shape.py strips only YAML's space and tab, so a value a Unicode space opens reads as PyYAML reads it, and validate-manifest, bootstrap, bump-leg and update-shape refuse a branch holding a character that does not print or is white space (#715) #823 does not conflict with bootstrap.py and repo_shape.py: a .shape-upstream-tip or a YAML file a Windows editor saved with a byte-order mark reads as the text it holds, so the upstream notice names the tip, a marked project.yaml is no longer schema_version is None, and every reader of a marked pin, the doctor's included, reads it alike (#855) #868. It merges cleanly as a PR, and as landed main (75d70502, inside 80aee84e).

Scratch paths

• Clone: /workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868b
• Worktrees under /workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868b-scratch/:
  • RV868b-head
  • RV868b-main: holds an untracked copy of tests/test_bom_reads.py
  • RV868b-mut: back to the head bytes, sha256 checked; holds the untracked tests/test_RV868b_rows.py
  • RV868b-extra and RV868b-extramain: hold the untracked tests/test_RV868b_extra.py
  • merge trees RV868b-mmain, -m815a to -m815e, -m823, -m821, -mnew, -mlatest. Their merge commits are local scratch commits with a rv868b@scratch.invalid identity, never pushed.
• Logs: RV868b-head-bom.log, RV868b-onmain.log, RV868b-gA.log to RV868b-gD.log, RV868b-gates.summary, RV868b-mutA.log, RV868b-mutB.log, RV868b-mutC1.log to RV868b-mutC3.log, RV868b-mutL2.log, RV868b-mutL3.log, RV868b-mnew*.log, RV868b-m815a.log, RV868b-m815d.log, RV868b-m823.log, RV868b-m821.log, RV868b-mlatest.log, RV868b-xextra.log, RV868b-xextramain.log
• Basetemps: bt-RV868b-*
• Probes: /workspace/projects/openRepoShape-worktrees/_lane3-scratch/RV868b-scratch/RV868b-probe/ holds gate.sh, gates.sh, mutate.py, runmut.sh, behave.py, should2.py, should2b.py, nit3.py, resolve815.py, test_RV868b_extra.py and test_RV868b_rows.py. The spec copy is RV868b-dl/spec122.html.

Lane: openreposhape-3 (openRepoShape-3)

[sourcery-ai]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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