btrfs-progs/tests/misc-tests/029-send-p-different-mountp.../test.sh

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#!/bin/bash
# test that send -p does not corrupt paths when send is using 2 different mount
# points
source "$TEST_TOP/common" || exit
check_prereq btrfs
check_prereq mkfs.btrfs
setup_root_helper
prepare_test_dev
# we need two mount points, cannot nest the subvolume under TEST_MNT
SUBVOL_MNT="`pwd`/subvol_mnt"
# the 2nd mount directory is created here, add a fallback in case we're on NFS
run_mayfail $SUDO_HELPER mkdir -p "$SUBVOL_MNT" ||
run_check mkdir -p "$SUBVOL_MNT"
run_check_mkfs_test_dev
run_check_mount_test_dev
run_check $SUDO_HELPER "$TOP/btrfs" subvolume create "$TEST_MNT/subv1"
run_check $SUDO_HELPER mount -t btrfs -o subvol=subv1 "$TEST_DEV" "$SUBVOL_MNT"
run_check $SUDO_HELPER "$TOP/btrfs" subvolume create "$TEST_MNT/test-subvol"
run_check $SUDO_HELPER "$TOP/btrfs" subvolume snapshot -r \
"$TEST_MNT/test-subvol" "$SUBVOL_MNT/test-subvol-mnt-subvol"
run_check $SUDO_HELPER "$TOP/btrfs" subvolume snapshot -r \
"$TEST_MNT/test-subvol" "$TEST_MNT/test-subvol-mnt-root"
run_mustfail_stdout "send -p on 2 mount points" \
$SUDO_HELPER "$TOP/btrfs" send -f /dev/null -p \
"$SUBVOL_MNT/test-subvol-mnt-subvol" "$TEST_MNT/test-subvol-mnt-root" \
| _log_stdout \
| grep -q "not on mount point: .*/mnt" \
|| _fail "expected output not found, please check the logs"
# without a fix, this leads to a corrupted path, with something like:
#
# ERROR: open st-subvol-mnt-subvol failed. No such file or directory
# ^^^^^^^^^^^^^^^^^^^^
# ERROR: could not resolve rootid for .../tests/mnt/subvol/test-subvol-mnt-subvol
# expected output:
# ERROR: not on mount point: .../tests/mnt/toplevel
run_check_umount_test_dev "$SUBVOL_MNT"
run_check_umount_test_dev "$TEST_MNT"
run_mayfail $SUDO_HELPER rmdir "$SUBVOL_MNT"
run_mayfail rmdir "$SUBVOL_MNT"
# don't propagate any potential error from run_mayfail()
exit 0