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Charon/scripts/ci/dry_run_history_rewrite.sh
2026-03-04 18:34:49 +00:00

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#!/usr/bin/env bash
set -euo pipefail
# CI wrapper that fails if the repo contains historical objects or commits
# touching specified paths, or objects larger than the configured strip size.
PATHS="backend/codeql-db,codeql-db,codeql-db-js,codeql-db-go"
STRIP_SIZE=50
usage() {
cat <<EOF
Usage: $0 [--paths 'p1,p2'] [--strip-size N]
Runs a quick, non-destructive check against the repository history and fails
with a non-zero exit code if any commits or objects are found that touch the
specified paths or if any historical blobs exceed the --strip-size in MB.
EOF
}
while [ "$#" -gt 0 ]; do
case "$1" in
--paths)
PATHS="$2"; shift 2;;
--strip-size)
STRIP_SIZE="$2"; shift 2;;
--help)
usage; exit 0;;
*)
echo "Unknown option: $1" >&2; usage; exit 1;;
esac
done
IFS=','; set -f
paths_list=""
for p in $PATHS; do
paths_list="$paths_list $p"
done
set +f; unset IFS
echo "Checking repository history for banned paths: $paths_list"
echo "Blobs larger than: ${STRIP_SIZE}M will fail the check"
failed=0
# 1) Check for commits touching paths
for p in $paths_list; do
count=$(git rev-list --all -- "$p" | wc -l | tr -d ' ')
if [ "$count" -gt 0 ]; then
echo "ERROR: Found $count historical commit(s) touching path: $p"
git rev-list --all -- "$p" | nl -ba | sed -n '1,50p'
echo "DRY-RUN FAILED: historical commits detected"
exit 1
else
echo "OK: No history touching: $p"
fi
done
# 2) Check for blob objects in paths only (ignore tag/commit objects)
# Temp files
tmp_objects=$(mktemp)
blob_list=$(mktemp)
# shellcheck disable=SC2086 # $paths_list is intentionally unquoted to expand into multiple args
git rev-list --objects --all -- $paths_list > "$tmp_objects"
blob_count=0
tmp_oids="$(mktemp)"
trap 'rm -f "$tmp_objects" "$blob_list" "$tmp_oids"' EXIT INT TERM
while read -r line; do
oid=$(printf '%s' "$line" | awk '{print $1}')
# Determine object type and only consider blobs
type=$(git cat-file -t "$oid" 2>/dev/null || true)
if [ "$type" = "blob" ]; then
echo "$line" >> "$blob_list"
blob_count=$((blob_count + 1))
fi
done < "$tmp_objects"
if [ "$blob_count" -gt 0 ]; then
echo "ERROR: Found $blob_count blob object(s) in specified paths"
nl -ba "$blob_list" | sed -n '1,100p'
echo "DRY-RUN FAILED: repository blob objects found in banned paths"
exit 1
else
echo "OK: No repository blob objects in specified paths"
fi
# 3) Check for large objects across history
echo "Scanning for objects larger than ${STRIP_SIZE}M..."
large_found=0
# Write all object oids to a temp file to avoid a subshell problem
tmp_oids="$(mktemp)"
git rev-list --objects --all | awk '{print $1}' > "$tmp_oids"
while read -r oid; do
size=$(git cat-file -s "$oid" 2>/dev/null || echo 0)
if [ -n "$size" ] && [ "$size" -ge $((STRIP_SIZE * 1024 * 1024)) ]; then
echo "LARGE OBJECT: $oid size=$size"
large_found=1
failed=1
fi
done < "$tmp_oids"
if [ "$large_found" -eq 0 ]; then
echo "OK: No large objects detected across history"
else
echo "DRY-RUN FAILED: large historical blobs detected"
exit 1
fi
if [ "$failed" -ne 0 ]; then
echo "DRY-RUN FAILED: Repository history contains blocked entries"
exit 1
fi
echo "DRY-RUN OK: No problems detected"
exit 0