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.
#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
------------
Note, -x does show a remounted dev:
Ishtar:/tmp/foo1/mnt> sudo mknod sda b 8 0
Ishtar:/tmp/foo1> ll mnt/sda
brw-rw-r-- 1 8, 0 Apr 15 17:59 mnt/sda
Ishtar:/tmp/foo1> touch mnt_sda
Ishtar:/tmp/foo1> sudo mount --bind mnt/sda mnt_sda
Ishtar:/tmp/foo1> ll mnt_sda
brw-rw-r-- 1 8, 0 Apr 15 17:59 mnt_sda
Ishtar:/tmp/foo1> mountpoint -x mnt_sda
8:0
"mount |grep foo1" shows all the mount points:
Ishtar:/tmp/foo1> mount |grep foo1
tmpfs on /tmp/foo1/mnt type tmpfs (rw,relatime)
tmpfs on /tmp/foo1/mnt_file type tmpfs (rw,relatime)
tmpfs on /tmp/foo1/mnt_null type tmpfs (rw,relatime)
tmpfs on /tmp/foo1/mnt_sda type tmpfs (rw,relatime)
======
Side (or end) note:
Besides "mountpoint" handling mounted inodes, it **could**
be "more complete" by being enhanced to:
1) scan all names on its command line
2) scan all inodes in a directory
or
3) scan all inodes recursively, starting at a directory
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