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ci: shallow checkout with on-demand base fetch (issue #306, B5) #329

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Merged
ShixiangWang merged 1 commit into from
Oct 11, 2026
Merged

ci: shallow checkout with on-demand base fetch (issue #306, B5) #329

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17 changes: 16 additions & 1 deletion .github/workflows/quarto-publish.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,10 @@ jobs:
- name: Checkout repo
uses: actions/checkout@v7
with:
fetch-depth: 0
# Shallow checkout (issue #306, B5): the change-detection step
# below needs only the base commit, which it fetches on demand.
# Full history costs ~1 min of checkout against a ~5 GB .git.
fetch-depth: 1

# ── Detect changed files ─────────────────────────────────
# Determines which QMDs changed so we can:
Expand All @@ -106,6 +109,18 @@ jobs:
exit 0
fi

# Shallow checkout (issue #306, B5): fetch just the base commit so
# the diff below has both endpoints. Fails soft – on error (e.g.
# the base commit was force-pushed away) fall back to a full build.
if ! git fetch --no-tags --depth=1 origin "$BASE_SHA"; then
echo "⚠️ Could not fetch base $BASE_SHA – treating as full build"
echo "changed_qmds=" >> "$GITHUB_OUTPUT"
echo "has_changes=false" >> "$GITHUB_OUTPUT"
echo "need_julia=true" >> "$GITHUB_OUTPUT"
echo "need_python=true" >> "$GITHUB_OUTPUT"
exit 0
fi

CHANGED_QMDS=$(git diff --name-only --diff-filter=ACMR "$BASE_SHA" HEAD -- '*.qmd' 2>/dev/null | tr '\n' ' ' || echo "")
echo "changed_qmds=$CHANGED_QMDS" >> "$GITHUB_OUTPUT"

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