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fix: REPO_MODE defaults to unknown when helper emits nothing

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- Remove head -20 truncation that biased solo classification by
  dropping low-volume contributors from the denominator
- Use atomic write (mktemp + mv) for cache to prevent concurrent
  preamble reads from seeing partial JSON

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-03-21 10:12:37 -07:00
parent 51bd9a5a63
commit f6b8360269
1 changed files with 7 additions and 3 deletions
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bin/gstack-repo-mode
+7 -3
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@@ -57,12 +57,13 @@ if [ -z "$DEFAULT_BRANCH" ]; then
DEFAULT_BRANCH="HEAD"
fi
fi
SHORTLOG=$(git shortlog -sn --since="90 days ago" --no-merges "$DEFAULT_BRANCH" 2>/dev/null | head -20)
SHORTLOG=$(git shortlog -sn --since="90 days ago" --no-merges "$DEFAULT_BRANCH" 2>/dev/null)
if [ -z "$SHORTLOG" ]; then
echo "REPO_MODE=unknown"
exit 0
fi
# Compute TOTAL from ALL authors (not truncated) to avoid solo bias
TOTAL=$(echo "$SHORTLOG" | awk '{s+=$1} END {print s}')
TOP=$(echo "$SHORTLOG" | head -1 | awk '{print $1}')
AUTHORS=$(echo "$SHORTLOG" | wc -l | tr -d ' ')
@@ -82,8 +83,11 @@ else
MODE=collaborative
fi
# Cache result (fail silently if ~/.gstack is unwritable)
# Cache result atomically (fail silently if ~/.gstack is unwritable)
mkdir -p "$CACHE_DIR" 2>/dev/null || true
echo "{\"mode\":\"$MODE\",\"top_pct\":$TOP_PCT,\"authors\":$AUTHORS,\"total\":$TOTAL,\"computed\":\"$(date -u +%Y-%m-%dT%H:%M:%SZ)\"}" > "$CACHE_FILE" 2>/dev/null || true
CACHE_TMP=$(mktemp "$CACHE_DIR/.repo-mode-XXXXXX" 2>/dev/null || true)
if [ -n "$CACHE_TMP" ]; then
echo "{\"mode\":\"$MODE\",\"top_pct\":$TOP_PCT,\"authors\":$AUTHORS,\"total\":$TOTAL,\"computed\":\"$(date -u +%Y-%m-%dT%H:%M:%SZ)\"}" > "$CACHE_TMP" 2>/dev/null && mv "$CACHE_TMP" "$CACHE_FILE" 2>/dev/null || rm -f "$CACHE_TMP" 2>/dev/null
fi
echo "REPO_MODE=$MODE"