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|
#!/bin/bash
#
# Copyright (C) 2024 Masatake YAMATO <yamato@redhat.com>
#
# This file is part of util-linux.
#
# This file is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This file is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
TS_TOPDIR="${0%/*}/../.."
TS_DESC="SOURCE column for fd opening a file on btrfs"
. "$TS_TOPDIR"/functions.sh
ts_init "$*"
ts_skip_nonroot
ts_check_test_command "$TS_CMD_LSFD"
ts_check_prog "stat"
ts_check_prog "sed"
ts_check_prog "mkfs.btrfs"
ts_check_prog "dd"
ts_cd "$TS_OUTDIR"
PID=
FD=3
IMG=img-column-source-btrfs.btrfs
MNTPNT=mntpnt-column-source-btrfs
FILE=${MNTPNT}/afile
mkdir -p $MNTPNT
dd if=/dev/zero of=$IMG bs=114294784 count=1 status=none
if ! mkfs.btrfs -q $IMG; then
ts_skip "failed to make a btrfs image: $IMG"
fi
if ! mount $IMG $MNTPNT; then
ts_skip "failed to mount a btrfs image, $IMG to $MNTPNT"
fi
trap "umount $MNTPNT; rm -f $IMG" EXIT
if ! touch $FILE; then
ts_skip "failed to touch a file on a btrfs filesystem: $FILE"
fi
#
# We cannot use %d of the stat command here.
#
# The major number may be 0. But we cannot assume the device number is
# the same as that of the minor number. A device number is composed of a
# major number and a minor number in a more complicated way on Linux.
# See /usr/include/bits/sysmacros.h.
#
# Fortunately, stat command provides %Ld format specifier for
# printing the minor number of a given file.
#
MIN=$(stat -c %Ld $FILE)
# %Ld is available since version 9.0 of coreutils.
# We cannot expect it to be available in any environment.
if ! [[ "$MIN" =~ [0-9]+ ]]; then
ts_skip "stat commands doesn't support %Ld format specifier"
fi
EXPECTED="btrfs:$MIN"
{
coproc MKFDS { "$TS_HELPER_MKFDS" ro-regular-file $FD file=$FILE; }
if read -u ${MKFDS[0]} PID; then
EXPR='(PID == '"${PID}"') and (FD == '"$FD"')'
SOURCE=$(${TS_CMD_LSFD} -n --raw -o SOURCE -Q "${EXPR}")
echo "SOURCE": $?
if [[ "$SOURCE" == "$EXPECTED" ]]; then
echo "SOURCE == EXPECTED"
else
echo "SOURCE: $SOURCE"
echo "EXPECTED: $EXPECTED"
fi
echo DONE >&"${MKFDS[1]}"
fi
wait "${MKFDS_PID}"
} > "$TS_OUTPUT" 2>&1
ts_finalize
|
