Fix pre-commit hook Bash 3.2 support and partial-staging swallow - #2133
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe pre-commit hook now propagates failures from staged-file discovery. It reports the Git read failure to stderr and exits with status 1 before treating the staged-file list as empty. Existing C/C++ path filtering remains unchanged. ChangesPre-commit failure handling
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In @.githooks/pre-commit:
- Line 28: Update the staged-file discovery loop around the files array to
propagate git diff failures: append an empty NUL-delimited sentinel when the
process substitution command fails, detect that sentinel before the empty-files
return, report the failure to stderr, and exit nonzero. Preserve the existing
file filtering and Bash 3.2-compatible syntax.
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.githooks/pre-commit
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Replace the mapfile-based collection of staged files with a NUL-separated read loop so the hook also runs on Bash 3.2 (/bin/bash on macOS), and filter file extensions inside the loop instead of piping through grep. Refuse to format staged C/C++ files that also have unstaged working tree changes: pgindent runs on the working tree and its result was re-added wholesale, silently pulling deliberately unstaged edits into the commit. The hook now stops with a clear error listing the offending files, leaving the index and working tree untouched. Assisted-by: Claude Code:qwen3.8-max Percentage of AI-generated code: 100% Co-Authored-By: Claude Code <noreply@anthropic.com> Signed-off-by: pilichoumao <99873428+pilichoumao@users.noreply.github.com>
A failed process substitution does not propagate its exit status to the reading loop, so a failing `git diff --cached` (e.g. a corrupt index) left the hook with an empty file list and it exited 0 without formatting anything. Emit a NUL sentinel when git diff fails and turn it into a clear error and nonzero exit. Git never lists empty filenames, so the sentinel cannot collide with real output. Addresses the CodeRabbit review comment on the previous commit. Assisted-by: Claude Code:qwen3.8-max Percentage of AI-generated code: 100% Co-Authored-By: Claude Code <noreply@anthropic.com> Signed-off-by: pilichoumao <99873428+pilichoumao@users.noreply.github.com>
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Fixes #2132.
.githooks/pre-commithad two defects: it used the Bash 4-onlymapfilebuiltin (so it died with exit 127 on macOS
/bin/bash3.2), and it formattedthe working-tree copies of staged files and then
git add-ed the wholefiles, silently pulling deliberately-unstaged edits into the commit.
What this changes
Single file:
.githooks/pre-commit.mapfile < <(... | grep ...)pipeline with a NUL-separatedwhile IFS= read -r -d '' floop overgit diff --cached --name-only --diff-filter=ACMR -z, doing the.c/.h/.cpp/.hppandsrc/tools/pg_bsd_indent/filtering with shell patternmatches inside the loop. This runs on Bash 3.2, keeps names with spaces /
non-ASCII intact, and drops the dependency on GNU
grep -zbehavior(macOS ships BSD grep).
pg_bsd_indentor formattinganything, each staged file is checked with
git diff --quiet -- "$f". If anyhas unstaged working-tree changes, the hook prints the offending paths, tells
the user their options (
git addthe whole file, set the unstaged changesaside themselves e.g.
git stash, orPG_NO_FORMAT=1 git commit), and exitsnon-zero. The index and working tree are left byte-for-byte unchanged —
nothing is formatted, re-added, or stashed.
review): a failed process substitution does not propagate its exit status to
the reading loop, so a failing
git diff --cached(e.g. a corrupt index)previously left the hook with an empty list and it exited 0 without
formatting. The command now emits a NUL sentinel on failure and the loop
turns it into a clear error and non-zero exit; git never lists empty
filenames, so the sentinel cannot collide with real output.
Everything else is unchanged: the
PG_NO_FORMAT=1skip,set -euo pipefail,the
pg_bsd_indentbuild logic,PGINDENT/PGTYPEDEFSexport, and thesecond
--checkverification.The fix deliberately stops on partial staging rather than trying to widen
the commit. Auto-formatting only the staged blob and replaying the unstaged
diff needs conflict and interrupt-recovery handling; that is left for a
separate design discussion and is not attempted here. No stash/pop (which could
lose user work) is used.
Verification
Acceptance matrix run in isolated throwaway git repos with a mocked
formatter, plus a real chain with the actual
pgindent+ a gcc/clang-builtpg_bsd_indent. Every scenario compares the index (git write-tree) andworking-tree file hashes (SHA-256) before and after.
/bin/bash3.2.57bash5.2.21pg_bsd_indent/)PG_NO_FORMAT=1Mocked matrix: 42/42 assertions pass on both Bash 3.2 and Bash 5.2 (final
head
4f07016984b; the first commit passed 37/37 before the listing-failurescenario was added).
Real chain (real
pgindentreformatting a real staged C file, then refusing apartial staging of the same file): Test A (reformat committed) = yes and Test B
(refuse, unchanged) = yes on both platforms. The resulting index hashes are
identical across macOS and Linux (
530e8207… -> a9a2cb65…for the reformat,aa6a88e9…unchanged for the refusal).Defects reproduced with the unmodified hook first: on macOS Bash 3.2 the
original hook exits
127withmapfile: command not found; on Linux Bash 5.2the original hook exits
0and swallows the unstagedint b = 3;into theindex.
git diff --checkpasses.Notes on the Linux real-chain build
The verification instance has no
bison/flexand package installs were outof scope.
pg_bsd_indent/pgindentdo not use the bison/flex-generatedbackend parser sources, so the build was run with the tree's own
NO_GENERATED_HEADERS=1switch, after generating the two perl-only headers thedependency chain actually needs (
utils/errcodes.h,utils/wait_event_types.h) with the in-tree perl scripts. This affects onlythe local verification build, not the committed change.
Scope / not done
infrastructure, and PostgreSQL-family projects conventionally do not test
hooks). The fixtures used for the matrix above live outside the repo.
tools/enable-git-hooks.sh(worktree compatibility) is intentionally leftfor a separate PR.
Assisted-by: Claude Code:qwen3.8-max
Percentage of AI-generated code: 100%
Human-reviewed. No
Signed-off-by/ DCO / CLA is added by the assistant; thesubmitter certifies that themselves.
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