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common/rc: new functions for multi-level mount/umount operations

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When I try to write cases about mount shared subtrees test, I find I
always need to do many mount operations, then then umount those
mount point one by one.

To make the code clear, I use a stack to save mounted points
sequentially, then I write 3 common functions to operate this stack.

1. The global stack named MOUNTED_POINT_STACK
2. _get_mount() accepts mount parameters like _mount() does, but the
   mountpoint parameter must be the last one. It will run the
   mount operation and push the mountpoint name into stack.
3. _put_mount() doesn't need any parameter. It will pop the newest
   mountpoint name from the stack, and umount it.
4. _clear_mount_stack() doesn't need any parameter either. It will
   umount all mountpoints in the stack sequentially, and set
   MOUNTED_POINT_STACK=""

Generally, the _clear_mount_stack() function also can be used as
_init_mount_stack() at the beginning of a case. Because it will
prepare an empty stack.

[eguan: add comments and fix code style]

Signed-off-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Zorro Lang
2017-02-13 19:55:42 -05:00
committed by Eryu Guan
parent e78ae074b2
commit 74a84259c5
1 changed files with 35 additions and 0 deletions
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common/rc
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@@ -160,6 +160,41 @@ _mount()
$MOUNT_PROG `_mount_ops_filter $*`
}
# Call _mount to do mount operation but also save mountpoint to
# MOUNTED_POINT_STACK. Note that the mount point must be the last parameter
_get_mount()
{
local mnt_point=${!#}
_mount $*
if [ $? -eq 0 ]; then
MOUNTED_POINT_STACK="$mnt_point $MOUNTED_POINT_STACK"
else
return 1
fi
}
# Unmount the last mounted mountpoint in MOUNTED_POINT_STACK
# and return it to caller
_put_mount()
{
local last_mnt=`echo $MOUNTED_POINT_STACK | awk '{print $1}'`
if [ -n "$last_mnt" ]; then
$UMOUNT_PROG $last_mnt
fi
MOUNTED_POINT_STACK=`echo $MOUNTED_POINT_STACK | cut -d\ -f2-`
}
# Unmount all mountpoints in MOUNTED_POINT_STACK and clear the stack
_clear_mount_stack()
{
if [ -n "$MOUNTED_POINT_STACK" ]; then
$UMOUNT_PROG $MOUNTED_POINT_STACK
fi
MOUNTED_POINT_STACK=""
}
_scratch_options()
{
type=$1