zfs-functions.in: in_mtab() always returns 1

$fs used with the wrong sed command where should be $mntpnt instead
to match a variable exported by read_mtab()

The fix is mostly to reuse the sed command found in read_mtab()

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Michael Niewöhner <[email protected]>
Signed-off-by: Alexey Smirnoff <[email protected]>
Closes #9168 

1 files changed, 5 insertions, 2 deletions

diff --git a/etc/init.d/zfs-functions.in b/etc/init.d/zfs-functions.in
index 490503e91..14667b4e9 100644
--- a/etc/init.d/zfs-functions.in
+++ b/etc/init.d/zfs-functions.in
@@ -373,10 +373,13 @@ read_mtab()
 
 in_mtab()
 {
-	local fs="$(echo "$1" | sed 's,/,_,g')"
+	local mntpnt="$1"
+	# Remove 'unwanted' characters.
+	mntpnt=$(printf '%b\n' "$mntpnt" | sed -e 's,/,,g' \
+	    -e 's,-,,g' -e 's,\.,,g' -e 's, ,,g')   
 	local var
 
-	var="$(eval echo MTAB_$fs)"
+	var="$(eval echo MTAB_$mntpnt)"
 	[ "$(eval echo "$""$var")" != "" ]
 	return "$?"
 }