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fix(presets): skip an unreadable restore source in preset remove (#4020)

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* fix(presets): skip an unreadable restore source in `preset remove`

`_unregister_skills_in_dir` restores each preset-owned SKILL.md from a core
command template or an extension source. Both of those reads were bare
`read_text(encoding="utf-8")` calls, so a project-owned override in
`.specify/templates/commands/` that exists but cannot be read or decoded
raised a raw `UnicodeDecodeError`/`OSError` straight out of
`PresetManager.remove()`, which has no handler for it — `specify preset
remove` dies with a traceback.

Every other failure in this loop degrades with `continue`: an unsafe
registry name, a missing skill subdirectory, a foreign owner. Sibling reads
of the very same directory are already guarded — `_infer_legacy_skill_
provenance` and `_delete_agent_preset_skills` both wrap their SKILL.md read
in `except (OSError, UnicodeDecodeError): continue`, and the read inside
`_substitute_core_template` was just given the same boundary in #3961. The
two restore reads were the remaining gap.

`continue` is the right recovery here rather than falling through: the
`else` branch below removes the skill outright, so treating an unreadable
source as "no source" would delete a user's skill at exactly the moment its
replacement cannot be generated. Skipping leaves the skill in place and
keeps it out of the returned `mutated_names`, so callers don't record a
restore that never happened.

Two regression tests, one per exception arm: a non-UTF-8 core template, and
a mocked `PermissionError` so the `OSError` half is also covered under
privileged CI where permission bits aren't enforced. Both assert the skill
survives untouched and is not reported as mutated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(presets): warn when a skill keeps preset content after a failed restore

Review follow-up on two points.

Surface the skipped restore. Skipping is still the correct recovery — the
alternative branch deletes the skill — but it was silent, and it is a
partial removal: `remove()` goes on to delete the preset directory and the
registry entry, while this `SKILL.md` keeps the removed preset's content,
and leaving the name out of `mutated_names` also keeps it out of
reconciliation, so nothing retries it. Both arms now emit a warning naming
the skill, the unreadable source, and the exception, and pointing at the
re-run that refreshes it once the file is fixed. `warnings.warn` matches
how the surrounding code reports non-fatal degradation (the reconciliation
failures in `remove()`/`install_from_directory`, the unreadable core
template in `_substitute_core_template` from #3961).

Cover the extension arm. A skill backed by an installed extension never
reaches the core-template read, so the two branches can regress
independently and both prior tests exercised only the core one.
`test_unregister_skills_in_dir_unreadable_extension_source_skips` installs
an extension whose command file is non-UTF-8 and asserts the skill survives
byte-for-byte and is absent from `mutated_names`. Verified it raises the
raw `UnicodeDecodeError` against unpatched source. The two existing tests
now assert the warning via `pytest.warns` so dropping it fails the suite.

pytest tests/test_presets.py -> 583 passed, 2 skipped, 7 failed; the 7 are
the pre-existing Windows symlink tests that need elevation, unchanged from
main. ruff check passes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Noor ul ain
2026-08-10 12:26:07 -05:00
committed by GitHub
co-authored by Claude Opus 4.8
parent f0ee1fc419
commit 1a44a6aa08
2 changed files with 197 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/test_presets.py
+149
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@@ -9452,6 +9452,155 @@ class TestPresetSkills:
"---\nname: speckit-specify\n---\n\nuser-owned content\n"
)
def test_unregister_skills_in_dir_unreadable_core_template_skips(
self, project_dir
):
"""An undecodable core template must not crash `preset remove`.
Every other failure in the restore loop — an unsafe registry name,
a missing skill subdirectory, a foreign owner — skips the skill
with ``continue``. The core-template read was outside that
boundary, so one non-UTF-8 project-owned override in
``.specify/templates/commands/`` raised a raw ``UnicodeDecodeError``
straight out of ``PresetManager.remove()``, which has no handler
for it. Sibling reads of the very same directory are already
guarded (``_substitute_core_template``, the provenance reads in
``_infer_legacy_skill_provenance``).
"""
self._write_init_options(project_dir, ai="claude", ai_skills=True)
skills_dir = project_dir / ".claude" / "skills"
skill_dir = self._create_skill(
skills_dir, "speckit-specify", "installed content"
)
core_commands = project_dir / ".specify" / "templates" / "commands"
core_commands.mkdir(parents=True, exist_ok=True)
(core_commands / "specify.md").write_bytes(
b"---\ndescription: \xff\xfe not utf-8\n---\n\nCore body\n"
)
manager = PresetManager(project_dir)
with pytest.warns(UserWarning, match="speckit-specify"):
mutated = manager._unregister_skills_in_dir(
["speckit-specify"], skills_dir, "claude"
)
assert mutated == [], (
"a skill whose restore source could not be read was not "
"restored, so it must not be reported as mutated"
)
assert (skill_dir / "SKILL.md").read_text(encoding="utf-8") == (
"---\nname: speckit-specify\n---\n\ninstalled content\n"
), (
"an unreadable core template must leave the skill untouched — "
"falling through to the rmtree branch would delete it exactly "
"when its replacement cannot be generated"
)
def test_unregister_skills_in_dir_unreadable_core_template_oserror_skips(
self, project_dir, monkeypatch
):
"""The same boundary must cover ``OSError`` (e.g. permission denied).
Mocked rather than chmod-based so the case also holds under
privileged CI, where permission bits are not enforced.
"""
self._write_init_options(project_dir, ai="claude", ai_skills=True)
skills_dir = project_dir / ".claude" / "skills"
skill_dir = self._create_skill(
skills_dir, "speckit-specify", "installed content"
)
core_commands = project_dir / ".specify" / "templates" / "commands"
core_commands.mkdir(parents=True, exist_ok=True)
core_template = core_commands / "specify.md"
core_template.write_text(
"---\ndescription: Core specify\n---\n\nCore body\n",
encoding="utf-8",
)
original_read_text = Path.read_text
def failing_read_text(self_path, *args, **kwargs):
if self_path == core_template:
raise PermissionError(13, "Permission denied")
return original_read_text(self_path, *args, **kwargs)
monkeypatch.setattr(Path, "read_text", failing_read_text)
manager = PresetManager(project_dir)
with pytest.warns(UserWarning, match="speckit-specify"):
mutated = manager._unregister_skills_in_dir(
["speckit-specify"], skills_dir, "claude"
)
monkeypatch.undo()
assert mutated == []
assert (skill_dir / "SKILL.md").read_text(encoding="utf-8") == (
"---\nname: speckit-specify\n---\n\ninstalled content\n"
)
def test_unregister_skills_in_dir_unreadable_extension_source_skips(
self, project_dir
):
"""The extension-restore arm needs the same boundary as the core arm.
The two restore reads are independent branches — a skill backed by an
installed extension never reaches the core-template read — so this
half of the guard can regress on its own. An undecodable extension
command file must warn, leave the skill byte-for-byte intact, and stay
out of ``mutated_names``.
"""
self._write_init_options(project_dir, ai="claude", ai_skills=True)
skills_dir = project_dir / ".claude" / "skills"
skill_dir = self._create_skill(
skills_dir, "speckit-fakeext-cmd", "installed content"
)
extension_dir = project_dir / ".specify" / "extensions" / "fakeext"
(extension_dir / "commands").mkdir(parents=True, exist_ok=True)
(extension_dir / "commands" / "cmd.md").write_bytes(
b"---\ndescription: \xff\xfe not utf-8\n---\n\nExtension body\n"
)
extension_manifest = {
"schema_version": "1.0",
"extension": {
"id": "fakeext",
"name": "Fake Extension",
"version": "1.0.0",
"description": "Test",
},
"requires": {"speckit_version": ">=0.1.0"},
"provides": {
"commands": [
{
"name": "speckit.fakeext.cmd",
"file": "commands/cmd.md",
"description": "Fake extension command",
}
]
},
}
with open(extension_dir / "extension.yml", "w") as f:
yaml.dump(extension_manifest, f)
manager = PresetManager(project_dir)
with pytest.warns(UserWarning, match="speckit-fakeext-cmd"):
mutated = manager._unregister_skills_in_dir(
["speckit-fakeext-cmd"], skills_dir, "claude"
)
assert mutated == [], (
"a skill whose extension restore source could not be read was "
"not restored, so it must not be reported as mutated"
)
assert (skill_dir / "SKILL.md").read_text(encoding="utf-8") == (
"---\nname: speckit-fakeext-cmd\n---\n\ninstalled content\n"
), (
"an unreadable extension source must leave the skill untouched — "
"falling through to the rmtree branch would delete it exactly "
"when its replacement cannot be generated"
)
def test_unregister_skills_in_dir_rejects_absolute_registry_name(
self, project_dir
):