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| author | Jim Meyering <meyering@redhat.com> | 2011-12-29 14:49:00 +0100 |
|---|---|---|
| committer | Jim Meyering <meyering@redhat.com> | 2012-01-03 16:55:58 +0100 |
| commit | 1e18d8416f9ef43bf08982cabe54220587061a08 (patch) | |
| tree | 7d5d10b59ce3e81508e3bd2114f17d69d321914c /NEWS | |
| parent | 520b69ce36a71f83772e7d2bfeed7aefd1bc4f6f (diff) | |
| download | coreutils-1e18d8416f9ef43bf08982cabe54220587061a08.tar.xz | |
df: work around long-named /dev/disk/by-uuid/... symlinks
On systems with recent kernel/tools, a symlink from /etc/mtab to
/proc/mounts, and a by-UUID mount (i.e., soon, nearly everyone),
you will see something like the following when running "df -hT":
(this has been truncated to fit in a width-limited ChangeLog file)
Filesystem Type Siz...
rootfs rootfs 11G
udev devtmpfs 3.8G
tmpfs tmpfs 774M
/dev/disk/by-uuid/828fc648-9f30-43d8-a0b1-f7096a2edb66 ext4 11G
tmpfs tmpfs 1.6G
/dev/sda2 ext3 494M
/dev/sda5 ext4 12G
/dev/sda6 ext4 9.9G
Contrast that with what we're used to seeing (modulo the
two entries mounted on "/", which is a separate problem):
Filesystem Type Size Used Avail Use% Mounted on
rootfs rootfs 11G 1.9G 8.0G 19% /
udev devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs tmpfs 774M 376K 774M 1% /run
/dev/sda3 ext4 11G 1.9G 8.0G 19% /
tmpfs tmpfs 1.6G 8.0K 1.6G 1% /run/shm
/dev/sda2 ext3 494M 78M 392M 17% /boot
/dev/sda5 ext4 12G 7.6G 3.7G 68% /usr
/dev/sda6 ext4 9.9G 6.6G 2.8G 71% /var
When that long /dev/disk/by-uuid/... name is merely a symlink
to a much shorter (and often more useful) device name like
"/dev/sda3", and when it's part of a listing of all file systems,
I would much prefer to see only the latter. Similarly, when using
an encrypted root file system, you would see a name like
/dev/mapper/luks-828fc648-9f30-43d8-a0b1-f7196a2edb66 pointing
to say, /dev/dm-0, I prefer the shorter name.
I.e., if I explicitly run
"df -hT /dev/disk/by-uuid/828fc648-9f30-43d8-a0b1-f7096a2edb66",
then, it's fine -- and expected -- to print to the long name.
It was explicitly given. However, with no non-option argument,
df should print the shorter name. Note that performing this
translation at a lower level (via a change to gnulib's mountlist.c)
would make it impossible to distinguish those two cases.
* src/df.c: Include "canonicalize.h".
(get_dev): Add a parameter, telling when we're in process-all-
mount-points mode; update all callers. When true, resolve
UUID-suffixed symlinks.
* NEWS (Changes in behavior): Mention it.
Reported by Dan Jacobson in http://bugs.gnu.org/10363
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -36,6 +36,11 @@ GNU coreutils NEWS -*- outline -*- ** Changes in behavior + df, with no non-option argument and recent enough kernel/tools, would + print a long UUID-including file system name, pushing second and subsequent + columns far to the right. Now, when that long name refers to a symlink, + df prints the usually-short referent instead. + tail -f now uses polling (not inotify) when any of its file arguments resides on a file system of unknown type. In addition, for each such argument, tail -f prints a warning with the FS type magic number and a |