Merge pull request spotify#3 from rccrdpccl/add-only-driver-volume-de…

…lete

add VOLUME_DELETE_ONLY_DRIVER

README.md

@@ -184,8 +184,10 @@ $ docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -v /etc:/etc spot
 The `/etc` directory is also mapped so that it can read any exclude files
 that you've created.
 
-If you want to remove volumes, you can do it so by passing REMOVE_VOLUMES env var set to 1.
+If you want to remove volumes, you can do so by passing REMOVE_VOLUMES env var set to 1.
 
 ```sh
 $ docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -v /etc:/etc -e REMOVE_VOLUMES=1 spotify/docker-gc
 ```
+
+If you want to remove volumes only for a specified driver, you can do it by passing VOLUME_DELETE_ONLY_DRIVER env var set to the driver name.

docker-gc

@@ -57,6 +57,7 @@ DRY_RUN=${DRY_RUN:=0}
 EXCLUDE_DEAD=${EXCLUDE_DEAD:=0}
 REMOVE_VOLUMES=${REMOVE_VOLUMES:=0}
 EXCLUDE_VOLUMES_IDS_FILE=${EXCLUDE_VOLUMES_IDS_FILE:=/etc/docker-gc-exclude-volumes}
+VOLUME_DELETE_ONLY_DRIVER=${VOLUME_DELETE_ONLY_DRIVER:=locale}
 
 for pid in $(pidof -s docker-gc); do
     if [[ $pid != $$ ]]; then
@@ -323,7 +324,11 @@ if [[ $REMOVE_VOLUMES -gt 0 ]]; then
             log "$MESSAGE"
         fi
     else
-        $DOCKER volume ls --filter "dangling=true" -q | grep -v -f $EXCLUDE_VOLUMES_IDS_FILE > volumes.reap
+        if [[ -z "$VOLUME_DELETE_ONLY_DRIVER" ]]; then
+            $DOCKER volume ls --filter "dangling=true" -q | grep -v -f $EXCLUDE_VOLUMES_IDS_FILE > volumes.reap
+        else
+            $DOCKER volume ls --filter "dangling=true" --filter "driver=$VOLUME_DELETE_ONLY_DRIVER" -q | grep -v -f $EXCLUDE_VOLUMES_IDS_FILE > volumes.reap
+        fi
 
         if [[ $DRY_RUN -gt 0 ]]; then
             volumes_log "The following volume would have been removed" volumes.reap