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fix(repo-mode): probe GNU stat before BSD so Git Bash stops crashing

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Fixes #2195. On GNU coreutils `stat -f` SUCCEEDS (filesystem status, not a
format string), so the BSD-first fallback chain never fell over — it fed
multi-word filesystem output into the cache-age arithmetic and crashed under
set -u on Windows Git Bash. GNU `stat -c` fails cleanly on BSD/macOS, making
GNU-first deterministic on both; the mtime is numeric-validated before
arithmetic as a last line of defense.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-08-16 09:20:14 -07:00
co-authored by Claude Fable 5
parent a118fd0c89
commit 2c07418ee1
1 changed files with 9 additions and 1 deletions
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bin/gstack-repo-mode
+9 -1
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@@ -44,7 +44,15 @@ fi
CACHE_DIR="$HOME/.gstack/projects/$SLUG"
CACHE_FILE="$CACHE_DIR/repo-mode.json"
if [ -f "$CACHE_FILE" ]; then
CACHE_AGE=$(( $(date +%s) - $(stat -f %m "$CACHE_FILE" 2>/dev/null || stat -c %Y "$CACHE_FILE" 2>/dev/null || echo 0) ))
# GNU first (#2195): on GNU coreutils `stat -f` SUCCEEDS with filesystem
# status (not a format string), so the BSD-first fallback chain never fell
# over — it fed multi-word filesystem output into the arithmetic below and
# crashed under set -u on Windows Git Bash. `stat -c` fails cleanly on
# BSD/macOS, making GNU-first the deterministic order. Numeric-validate
# before arithmetic as the last line of defense.
CACHE_MTIME=$(stat -c %Y "$CACHE_FILE" 2>/dev/null || stat -f %m "$CACHE_FILE" 2>/dev/null || echo 0)
case "$CACHE_MTIME" in ''|*[!0-9]*) CACHE_MTIME=0 ;; esac
CACHE_AGE=$(( $(date +%s) - CACHE_MTIME ))
if [ "$CACHE_AGE" -lt 604800 ]; then # 7 days in seconds
MODE=$(grep -o '"mode":"[^"]*"' "$CACHE_FILE" | head -1 | cut -d'"' -f4)
[ -n "$MODE" ] && echo "REPO_MODE=$(validate_mode "$MODE")" && exit 0