#!/bin/sh

# Copyright (C) 2021 by Achim Leitner <aleitner@lis-engineering.de>
# This program is distributable under the terms of the GNU GPL (see COPYING)
#
# Modern linux systems have the protected_regular feature set to 1 or 2
# See https://www.kernel.org/doc/Documentation/sysctl/fs.txt
# Make sure we can still write these files in --inplace mode

. "$suitedir/rsync.fns"

test -f /proc/sys/fs/protected_regular || test_skipped "Can't find protected_regular setting (only available on Linux)"
pr_lvl=`cat /proc/sys/fs/protected_regular 2>/dev/null` || test_skipped "Can't check if fs.protected_regular is enabled"
test "$pr_lvl" != 0 || test_skipped "fs.protected_regular is not enabled"

workdir="$tmpdir/files"
mkdir -p "$workdir"
chmod 1777 "$workdir"

echo "Source" > "$workdir/src"
echo ""       > "$workdir/dst"

if ! chown 5001 "$workdir/dst" 2>/dev/null; then
    # Not root - try re-running under unshare with UID mapping
    if [ -z "$RSYNC_UNSHARED" ] && unshare --user --map-root-user --map-users 5001:100000:1 true 2>/dev/null; then
	echo "Re-running under unshare with UID mapping..."
	RSYNC_UNSHARED=1 exec unshare --user --map-root-user --map-users 5001:100000:1 "$SHELL_PATH" $RUNSHFLAGS "$0"
    fi
    test_skipped "Can't chown (need root or unshare with uidmap)"
fi

echo "Contents of $workdir:"
ls -al "$workdir"

$RSYNC --inplace "$workdir/src" "$workdir/dst" || test_fail

exit 0