On 4/22/19 10:45 AM, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > Use findmnt to determine if the passed-in argument is associated with a > mount point, and if so, use spaceman to query the mounted filesystem. > If the user passed in a file, try to find out if it's a loop mounted > live filesystem and if so query the live filesystem. > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> older util-linux doesn't have -O either, but that's getting really old and I guess we'll burn that bridge if we come to it. Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx> > --- > debian/control | 2 +- > spaceman/xfs_info.sh | 22 +++++++++++++++++++--- > 2 files changed, 20 insertions(+), 4 deletions(-) > > > diff --git a/debian/control b/debian/control > index f4f807b0..0b3205f5 100644 > --- a/debian/control > +++ b/debian/control > @@ -8,7 +8,7 @@ Standards-Version: 4.0.0 > Homepage: https://xfs.wiki.kernel.org/ > > Package: xfsprogs > -Depends: ${shlibs:Depends}, ${misc:Depends}, python3:any > +Depends: ${shlibs:Depends}, ${misc:Depends}, python3:any, util-linux > Provides: fsck-backend > Suggests: xfsdump, acl, attr, quota > Breaks: xfsdump (<< 3.0.0) > diff --git a/spaceman/xfs_info.sh b/spaceman/xfs_info.sh > index ecf17f61..1bf6d2c3 100755 > --- a/spaceman/xfs_info.sh > +++ b/spaceman/xfs_info.sh > @@ -7,6 +7,14 @@ > OPTS="" > USAGE="Usage: xfs_info [-V] [-t mtab] [mountpoint|device|file]" > > +# Try to find a loop device associated with a file. We only want to return > +# one loopdev (multiple loop devices can attach to a single file) so we grab > +# the last line and return it if it's actually a block device. > +try_find_loop_dev_for_file() { > + local x="$(losetup -O NAME -j "$1" 2> /dev/null | tail -n 1)" > + test -b "$x" && echo "$x" > +} > + > while getopts "t:V" c > do > case $c in > @@ -24,11 +32,19 @@ set -- extra "$@" > shift $OPTIND > case $# in > 1) > - if [ -b "$1" ] || [ -f "$1" ]; then > - xfs_db -p xfs_info -c "info" $OPTS "$1" > + arg="$1" > + > + # See if we can map the arg to a loop device > + loopdev="$(try_find_loop_dev_for_file "${arg}")" > + test -n "${loopdev}" && arg="${loopdev}" > + > + # If we find a mountpoint for the device, do a live query; > + # otherwise try reading the fs with xfs_db. > + if mountpt="$(findmnt -f -n -o TARGET "${arg}" 2> /dev/null)"; then > + xfs_spaceman -p xfs_info -c "info" $OPTS "${mountpt}" > status=$? > else > - xfs_spaceman -p xfs_info -c "info" $OPTS "$1" > + xfs_db -p xfs_info -c "info" $OPTS "${arg}" > status=$? > fi > ;; >
