Add -m option to manually specify mount point

Fixes #71

bin/snap-sync

@@ -92,6 +92,7 @@ Options:
  -n, --noconfirm          do not ask for confirmation
  -k, --keepold            keep old incremental snapshots instead of deleting them
                           after backup is performed
+ -m, --mountpoint         optionally specify where subvolume is mounted if mounted in multiple locations
  -p, --port <port>        remote port; wsed with '--remote'.
  -q, --quiet              do not send notifications; instead print them.
  -r, --remote <address>   ip address of a remote machine to backup to
@@ -105,6 +106,7 @@ EOF
 
 ssh=""
 sudo=0
+mount_cmdline=""
 while [[ $# -gt 0 ]]; do
     key="$1"
     case $key in
@@ -124,6 +126,10 @@ while [[ $# -gt 0 ]]; do
             subvolid_cmdline="$2"
             shift 2
         ;;
+        -m|--mountpoint)
+            mount_cmdline="$2"
+            shift 2
+        ;;
         -k|--keepold)
             keep="yes"
             shift
@@ -237,14 +243,25 @@ done
 i=0
 disk=-1
 disk_count=0
-for x in $UUIDS; do
-    UUIDS_ARRAY[$i]=$x
-    if [[ "$x" == "$uuid_cmdline" && ${SUBVOLIDS_ARRAY[$((i))]} == "$subvolid_cmdline" ]]; then
-        disk=$i
-        disk_count=$(($disk_count+1))
-    fi
-    i=$((i+1))
-done
+if [[ -z "$mount_cmdline" ]]; then
+    for x in $UUIDS; do
+        UUIDS_ARRAY[$i]=$x
+        if [[ "$x" == "$uuid_cmdline" && ${SUBVOLIDS_ARRAY[$((i))]} == "$subvolid_cmdline" ]]; then
+            disk=$i
+            disk_count=$(($disk_count+1))
+        fi
+        i=$((i+1))
+    done
+else
+    for x in $UUIDS; do
+        UUIDS_ARRAY[$i]=$x
+        if [[ "$x" == "$uuid_cmdline" && ${SUBVOLIDS_ARRAY[$((i))]} == "$subvolid_cmdline" && ${TARGETS_ARRAY[$((i))]} == "$mount_cmdline"]]; then
+            disk=$i
+            disk_count=$(($disk_count+1))
+        fi
+        i=$((i+1))
+    done
+fi
 
 if [[ "${#UUIDS_ARRAY[$@]}" -eq 0 ]]; then
     die "No external btrfs subvolumes found to backup to. Run '$name -h' for more options."

man8/snap-sync.8

@@ -12,6 +12,7 @@ snap-sync \- send incremental btrfs snapshots, keeping track of them with snappe
 [\fB-p\fR \fIport\fR] 
 [\fB--sudo\fR]
 [\fB-s\fR \fIsubvolid\fR] 
+[\fB-m\fR \fImountpoint\fR] 
 [\fB-u\fR \fIUUID\fR]
 [\fB-k\fR]
 [\fB-q\fR]
@@ -110,7 +111,15 @@ Specify the subvolume id of the mounted BTRFS subvolume to back up to. Defaults
 \fB\-u, \-\-UUID\fR \fIUUID\fR
 .RS 4
 Specify the UUID of the mounted BTRFS subvolume to back up to. Otherwise will prompt.
-If multiple mount points are found with the same UUID and subvolid, will prompt user.
+If multiple mount points are found with the same UUID and subvolid, will prompt user,
+or user can specify mount point manually with \fB-m\fR.
+.RE
+.PP
+
+\fB\-m, \-\-mountpoint\fR \fImount point\fR
+.RS 4
+Specify the mount point of the disk to back up to. Useful if multiple mount points
+are used for the same disk.
 .RE
 .PP