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#!/bin/sh
# shellcheck shell=busybox
case "$1" in
duperemove)
# btrfs-extent-same has no --version/--help; it prints usage and
# exits 1 when run without the required file/offset arguments.
btrfs-extent-same 2>&1 | grep -F "Usage:" || exit 1
# duperemove only scans a path whose filesystem it can identify: off
# btrfs it rejects devices with major 0 (tmpfs, overlayfs) and
# otherwise needs libblkid to find a UUID for the backing device.
# The CI container's filesystem usually fails one of those, and the
# path is then skipped silently (exit 0, nothing hashed). So the
# scan is only checked end to end where the filesystem is
# supported; elsewhere we require duperemove's own refusal message,
# so a genuine scan regression still fails.
#
# Keep the hashfile outside the scanned directory so duperemove
# does not pick up its own hashfile/WAL/SHM files as scan targets.
# Both are absolute paths under the physical CWD (pwd -P), since
# duperemove canonicalizes scanned paths with realpath() before
# recording them and the lookup below must match that spelling. A CWD
# of "/" would otherwise yield "//name", so strip the trailing slash.
cwd="$(pwd -P)"
cwd="${cwd%/}"
dir="$(mktemp -d "$cwd/duperemove-test.XXXXXX")"
hashfile="$(mktemp "$cwd/duperemove-test-hashes.XXXXXX")"
trap 'rm -rf "$dir" "$hashfile" "$hashfile-wal" "$hashfile-shm"' EXIT
# Two identical files give duperemove real duplicate extents to
# hash, exercising the same code path (including the lscpu-based
# core count detection) that a real scan would use.
head -c 1048576 /dev/urandom > "$dir/a"
cp "$dir/a" "$dir/b"
# --debug is what makes duperemove explain why it skipped a path.
out="$(duperemove -r --debug --hashfile="$hashfile" "$dir" 2>&1)" || {
echo "$out"
exit 1
}
[ -s "$hashfile" ] || exit 1
if hashstats -l "$hashfile" 2>&1 | grep -F "$dir/a"; then
exit 0
fi
if echo "$out" | grep -E 'unsupported filesystem|could not get uuid|unable to find the mount infos'; then
echo "scan skipped: duperemove does not support this filesystem"
exit 0
fi
echo "$out"
exit 1
;;
*)
echo "Untested package: $1" >&2
exit 1
;;
esac
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