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#!/usr/bin/env bash
#
# snapshot-cgroup - Copy cgroup v2 files from the live system into a
# directory tree suitable for use with TestIntegrationCgroupLimits.
#
# Usage: snapshot-cgroup <output-dir>
#
# The script reads /proc/self/cgroup to find the v2 group path and copies
# exactly the files that the cgroup package needs:
#
# proc/self/cgroup
# sys/fs/cgroup/<group>/cpu.max
# sys/fs/cgroup/<group>/memory.max
set -euo pipefail
if [[ $# -ne 1 ]]; then
echo "Usage: $0 <output-dir>" >&2
exit 1
fi
out="$1"
mkdir -p "$out"
copy_file() {
local src="$1" dst="$out/$2"
mkdir -p "$(dirname "$dst")"
cp "$src" "$dst"
}
copy_file /proc/self/cgroup proc/self/cgroup
group=$(awk -F: '/^0::/ { print $3 }' /proc/self/cgroup)
cgdir="/sys/fs/cgroup${group}"
for f in cpu.max memory.max; do
if [[ -f "$cgdir/$f" ]]; then
copy_file "$cgdir/$f" "sys/fs/cgroup${group}/$f"
fi
done
echo "Snapshot written to $out"
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