I'd like to merge libmount and findmnt(8) into util-linux-ng in next
days. Currently, this stuff is at:
git://git.kernel.org/pub/scm/utils/util-linux-ng/kzak/libmount.git
The libmount library is designed to be used in low-level utils like
mount(8) and /sbin/mount.<type> helpers as well as in some other
projects (for example autofs and systemd come to mind).
The library API is still officially unstable and my plan is to keep it
unstable for the next util-linux-ng release.
The existing utils like mount(8) or umount(8) won't be linked against
the library in the next release (plan is to have 2.18-rc1 this week).
This invasive change is planned for util-linux-ng-2.19 (October/November).
Features (already implemented):
* allows to set/get/remove mount options from a string
* simple mount options parser
* high-level extensible mount options parser
- mount options are described by "mount options maps" and it's
possible to create FS specific map; built-in are maps with
userspace mount options and kernel FS independent options
- this parser allows to generate data and flags for mount(2)
* fstab, mtab and /proc/self/mountinfo parser
* allows to search in parsed fstab, mtab and mountinfo files
- these functions cover all possibilities like LABEL vs. UUID vs. devname,
canonicalized vs. non-canonicalized paths, etc.
- all LABEL/UUID operations are hidden, the library uses libblkid
for tags evaluation
* old mtab locking methods (necessary for backward compatibility)
* utils for fstype and mount options matching (see -t and -O in mount.8)
Planned features (near future -- 2.19):
* support /etc/fstab.d/
* support systems without /etc/mtab
- one API for work with mtab on systems with or without /etc/mtab
- maintain userspace specific mount options in /var/run/libmount
* monitor VFS changes (poll(/proc/self/mountinfo)), something like
$ findmnt --monitor /home/foo
* hing-level API for mount(2) to avoid exec(/bin/mount) in some programs
The findmnt(8) is a new util linked against libmount. This util is a
command line interface for all look-up functionality in the library. It's
designed to be used in init scripts or from command line (use grep(1) is
a bad idea). See below for examples.
Comments & wishes & suggestions?
Karel
$ findmnt
TARGET SOURCE FSTYPE OPTIONS
/ /dev/sda4 ext3 rw,noatime,errors=co
├─/proc /proc proc rw,relatime
│ ├─/proc/bus/usb /proc/bus/usb usbfs rw,relatime
│ └─/proc/sys/fs/binfmt_misc none binfmt_m rw,relatime
├─/sys /sys sysfs rw,relatime
├─/dev udev devtmpfs rw,relatime,size=197
│ ├─/dev/pts devpts devpts rw,relatime,gid=5,mo
│ └─/dev/shm tmpfs tmpfs rw,relatime
├─/boot /dev/sda1 ext3 rw,noatime,errors=co
├─/home/kzak /dev/mapper/kzak-home ext4 rw,noatime,barrier=1
│ └─/home/kzak/.gvfs gvfs-fuse-daemon fuse.gvf rw,nosuid,nodev,rela
└─/var/lib/nfs/rpc_pipefs sunrpc rpc_pipe rw,relatime
$ findmnt --fstab -t ext3
TARGET SOURCE FSTYPE OPTIONS
/ UUID=d3a8f783-df75-4dc8-9163-975a891052c0 ext3 noatime,defaults
/boot UUID=f1cd38fa-c887-4ab8-834b-c8ee659b97fe ext3 noatime,defaults
$ findmnt --fstab --evaluate -t ext3
TARGET SOURCE FSTYPE OPTIONS
/ /dev/sda4 ext3 noatime,defaults
/boot /dev/sda1 ext3 noatime,defaults
$ findmnt --help
Usage:
findmnt [options]
findmnt [options] <device> | <mountpoint>
findmnt [options] <device> <mountpoint>
findmnt [options] [--source <device>] [--target <mountpoint>]
Options:
-s, --fstab search in static table of filesystems
-m, --mtab search in table of mounted filesystems
-k, --kernel search in kernel table of mounted
filesystems (default)
-c, --canonicalize canonicalize printed paths
-d, --direction <word> search direction - 'forward' or 'backward'
-e, --evaluate print all TAGs (LABEL/UUID) evaluated
-f, --first-only print the first found filesystem only
-h, --help print this help
-i, --invert invert sense of matching
-l, --list use list format ouput
-n, --noheadings don't print headings
-u, --notruncate don't truncate text in columns
-O, --options <list> limit the set of filesystems by mount options
-o, --output <list> output columns
-r, --raw use raw format output
-a, --ascii use ascii chars for tree formatting
-t, --types <list> limit the set of filesystem by FS types
-S, --source <string> device, LABEL= or UUID=device
-T, --target <string> mountpoint
For more information see findmnt(1).
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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