fix: skip non-regular files matched by glob in model test - #742
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A glob match that is a FIFO with no writer causes os.ReadFile to block forever. filepath.Glob matches are now filtered to regular files only; explicitly named paths are left untouched. Closes openfga#739
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WalkthroughThe change adds ChangesTest-file glob resolution
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟠 High · up to The command can still read FIFO matches returned by a test-file glob and hang indefinitely, so the PR does not yet reliably prevent the reported CLI failure. Merge should be blocked until the filtering helper is integrated into the command path and the affected behavior is covered. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@cmd/model/test.go`:
- Around line 178-197: Update modelTestCmd to use resolveTestFiles instead of
calling filepath.Glob directly, while preserving whether the original glob
produced matches so no-match handling remains distinct from all matches being
filtered as non-regular. Keep literal FIFO paths intact when Glob returns an
existing explicit path, and add command-level tests covering mixed matches,
all-non-regular matches, and a literal FIFO path.
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cmd/model/test.gocmd/model/test_test.go
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@terry-writer Can you please sign the CLA? |
SoulPancake
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Thanks for working on this.
-
resolveTestFilesis tested, butmodelTestCmdstill callsfilepath.Globdirectly. I ran the FIFO reproduction against bothmainand this PR, and both commands were still blocked when killed after three seconds. Wiring the resolver into the command made the same reproduction complete successfully. Could you updatemodelTestCmdto use it and add a test through the actual command path? A straight replacement also double-wraps resolver errors and treats “all matches filtered” like an unmatched glob, so those cases need to be handled separately. -
cmd/model/test_test.gousessyscall.Mkfifowithout a Unix build constraint. I verified that the model test package compiles for Windows on the base commit but fails on this PR withundefined: syscall.Mkfifoat lines 25 and 82. Could you move the FIFO-specific tests into a*_unix_test.gofile with//go:build unix, following the existing pattern ininternal/storetest/security_unix_test.go?
- Wire RunE to actually call resolveTestFiles instead of calling filepath.Glob directly, so the fix takes effect at runtime. - Fold the literal-path fallback into resolveTestFiles and distinguish 'glob matched nothing' from 'glob matched only non-regular files', avoiding double-wrapped errors and a confusing fallback-to-literal-path error message. - Move FIFO-based tests into test_unix_test.go behind //go:build unix, since syscall.Mkfifo does not exist on Windows.
…writer/cli into fix/skip-non-regular-glob-matches
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Thanks for the thorough review!
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Pull request overview
Adds safe glob resolution for model test files to avoid blocking on FIFOs.
Changes:
- Filters non-regular glob matches.
- Adds handling for unmatched/all-non-regular patterns.
- Adds general and Unix-specific tests.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
cmd/model/test.go |
Adds test-file resolution and filtering. |
cmd/model/test_test.go |
Tests literal and unmatched paths. |
cmd/model/test_unix_test.go |
Tests FIFO filtering on Unix. |
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SoulPancake
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Thanks, the glob fix works now and the Windows compile issue is sorted.
One problem left: this breaks process substitution and explicit FIFO paths.
$ fga model test --tests <(cat ok.fga.yaml)
Error: tests pattern matched only non-regular files (e.g. FIFOs); pass an explicit regular file path instead: /dev/fd/11The literal-path fallback never runs for paths that exist. filepath.Glob doesn't return zero matches for a plain path, it returns the path itself as a single match. So /dev/fd/11 goes through the regular-file filter and gets rejected.
Suggest checking for glob metacharacters up front instead:
func resolveTestFiles(testsPattern string) ([]string, error) {
// No glob metacharacters: treat as a literal path and honor it as-is so
// explicitly named non-regular paths (e.g. --tests <(...)) keep working.
if !strings.ContainsAny(testsPattern, `*?[`) {
if _, statErr := os.Stat(testsPattern); statErr != nil {
return nil, fmt.Errorf("test file %s does not exist: %w", testsPattern, statErr)
}
return []string{testsPattern}, nil
}
rawMatches, err := filepath.Glob(testsPattern)
if err != nil {
return nil, fmt.Errorf("invalid tests pattern %s due to %w", testsPattern, err)
}
regularFileNames := rawMatches[:0]
for _, name := range rawMatches {
info, statErr := os.Stat(name)
if statErr != nil {
return nil, fmt.Errorf("failed to stat test file %s: %w", name, statErr)
}
if info.Mode().IsRegular() {
regularFileNames = append(regularFileNames, name)
}
}
if len(regularFileNames) == 0 {
return nil, fmt.Errorf("%w: %s", errAllTestFilesNonRegular, testsPattern)
}
return regularFileNames, nil
}Avoid a rawMatches[0] == testsPattern equality check here: a FIFO literally named *.fga.yaml as the only match would pass it and hang again. The metacharacter check filters that correctly. This also drops the odd "stat the glob pattern as a path" fallback, so an unmatched glob gets a sensible error instead of stat *.fga.yaml: no such file.
Two tests to add:
- a literal FIFO path is returned as-is (the current literal-path test uses a regular file, so it can't catch this)
- a FIFO named
*.fga.yamlgets filtered, not treated as literal
The resolveTestFiles doc comment needs updating too, it credits process substitution to the no-match fallback, which isn't what happens.
Not blocking: stat-then-read still has a TOCTOU window. A follow-up could route the top-level read through internal/safefile like #737 did for nested refs.
- Add TestModelTestCmdDoesNotHangOnFifoGlobMatch, which runs modelTestCmd.Execute() with a FIFO glob match and asserts it returns within a deadline instead of hanging (per review). - Suppress paralleltest on that test since it mutates the shared global modelTestCmd and must not run in parallel.
…writer/cli into fix/skip-non-regular-glob-matches
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Thanks again! Addressed all three points:
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Branch on glob metacharacters up front: a pattern without *, ?, or [ is treated as an explicit literal path and honored as-is, so process substitution (--tests <(...), a FIFO like /dev/fd/11) works again. Only patterns with metacharacters go through glob expansion and the regular-file filter, so a FIFO literally named '*.fga.yaml' is still filtered rather than read. Add tests for an explicit FIFO path being honored and a FIFO named like a glob still being filtered. Update the resolveTestFiles doc comment to match the new behavior.
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Good catch — you're right, the no-match fallback never fired for Added the two tests you suggested (explicit FIFO path honored; FIFO On the TOCTOU point: agreed it's worth routing the top-level read |
SoulPancake
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Thanks @terry-writer
LGTM
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Picking up the TOCTOU follow-up we discussed — before I open a PR I Routing the top-level read through If I read the intent correctly, closing the TOCTOU window on the Does that match what you had in mind? And is it worth doing at all |
Closes #739
Problem
fga model test --testsexpands the--testsflag viafilepath.Globand reads every match with
os.ReadFile. If a match is a FIFO with nowriter, the read blocks forever and the CLI hangs until killed.
Fix
After
filepath.Glob, each match is nowos.Stat'd and filtered toregular files only (following the approach used by Terraform's
fileset, referenced in the issue). Non-regular matches (FIFOs,devices, sockets) are silently skipped rather than read.
The literal-path fallback (used when the glob pattern matches nothing)
is untouched, so explicitly named non-regular paths — e.g. process
substitution like
--tests <(...)— continue to work exactly asbefore.
The filtering logic is extracted into
resolveTestFilesso it can beunit tested without mocking the full FGA client.
Open question for maintainers
If every glob match is non-regular,
resolveTestFilesnow returnsan empty slice, and the caller falls through to the literal-path
fallback — which will
os.Statthe pattern itself (e.g.*.fga.yaml) and fail with "test file does not exist". The issuenotes that whether an explicitly named non-regular path should error
or be read "as it is today" is a separate decision; I went with the
narrower, non-breaking fix here and left that question open rather
than guessing at the intended behavior.
Testing
cmd/model/test_test.gowith 3 unit tests covering:issue, using
syscall.Mkfifo)make test-unitandmake lintpass locally.mkfifo+fga model test --tests "*.fga.yaml", confirmed it no longer hangs after thefix.
Summary by CodeRabbit
Bug Fixes
Tests