1 files changed, 21 insertions, 11 deletions

diff --git a/systemd-zfs-partition-backup.sh b/systemd-zfs-partition-backup.sh
index e40c241..aa3951f 100755
--- a/systemd-zfs-partition-backup.sh
+++ b/systemd-zfs-partition-backup.sh
@@ -1,16 +1,6 @@
 #!/usr/bin/bash
 # Written in 2020 by Max Christian Pohle <webmaster@coderonline.de>
 
-# check for a configuration file and source it in if its there
-test -f /etc/default/systemd-zfs-partition-backup &&\
-   source /etc/default/systemd-zfs-partition-backup
-
-DISK_NAME=$1
-DISK_NAME_ESCAPED=$(systemd-escape "$DISK_NAME")
-
-logger "Disk: $DISK_NAME"
-logger "    : $DISK_NAME_ESCAPED (escaped)"
-
 function beep() {
     test -f /usr/bin/beep &&\
         env -u SUDO_GID -u SUDO_COMMAND -u SUDO_USER -u SUDO_UID /usr/bin/beep $@
@@ -34,9 +24,29 @@ function stop() {
 }
 
 
+
+# check for a configuration file and source it in if its there
+test -f /etc/default/systemd-zfs-partition-backup &&\
+   source /etc/default/systemd-zfs-partition-backup
+
+DISK_NAME=$1
+DISK_NAME_ESCAPED=$(systemd-escape "$DISK_NAME")
+
+logger "Disk: $DISK_NAME"
+logger "    : $DISK_NAME_ESCAPED (escaped)"
+
+DATASETS_WITH_DISKNAME=$(zfs list -H -o name | grep $DISK_NAME)
+
+
+[ -z "$DATASETS_WITH_DISKNAME" ] &&\
+        (fail "no datasets found with name $DISK_NAME. Please create some." ; exit 1)
+
+logger "Datasets: $DATASETS_WITH_DISKNAME"
+
 # iterate over all datasets
-for i in $(zfs list -H -o name);
+for i in ${DATASETS_WITH_DISKNAME[@]};
 do
+    logger "assertion: $(basename $i) == $DISK_NAME"
     # compare the 'tail' of the PATH against the disk name...
     if [ "$(basename $i)" == "$DISK_NAME" ]; then
         start $DISK_NAME