On Sat, Apr 15, 2017 at 06:08:17PM -0700, L A Walsh wrote:
>
> mountpoint doesn't detect file, device
> or other inode mount points.
>
> Also, the "-d" switch doesn't show the maj:min of the mounted
> inode. Of note: "-x" does show the maj:min of a remounted blockdev.
Version, distro, do you have classic mtab, etc, etc.... ?
> #reproduce (showing additional variant w/a char device)
>
> cd /tmp
> mkdir foo1
> cd foo1
> mkdir mnt
> sudo mount tmpfs -t tmpfs mnt
> touch mnt/file mnt_file mnt_null
> sudo mknod mnt/null c 1 3
> sudo mount --bind mnt/file mnt_file
> sudo mount --bind mnt/null mnt_null
> function is_mountedQ {
> if /usr/bin/mountpoint -q $1; then
> echo "$1 is a mount point"
> else
> echo "$1 is not a mount point"
> fi
> }
> is_mountedQ mnt_file
> is_mountedQ mnt_null
Works for me:
# cd /tmp
# mkdir foo1
# cd foo1
# mkdir mnt
# mount tmpfs -t tmpfs mnt
# touch mnt/file mnt_file mnt_null
# mknod mnt/null c 1 3
# mount --bind mnt/file mnt_file
# mount --bind mnt/null mnt_null
# mountpoint mnt_null
mnt_null is a mountpoint
# mountpoint mnt_file
mnt_file is a mountpoint
# findmnt --submounts /tmp
TARGET SOURCE FSTYPE OPTIONS
/tmp tmpfs tmpfs rw,nosuid,nodev
├─/tmp/foo1/mnt tmpfs tmpfs rw,relatime
├─/tmp/foo1/mnt_file tmpfs[/file] tmpfs rw,relatime
└─/tmp/foo1/mnt_null tmpfs[/null] tmpfs rw,relatime
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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