Enabling other container tools then docker

README.md

@@ -6,8 +6,10 @@
 
 Vackup: (contraction of "volume backup")
 
-Easily backup and restore Docker volumes using either tarballs or container images.
-It's designed for running from any host/container where you have the docker CLI.
+Easily backup and restore OCI volumes using either tarballs or container images.
+It's designed for running from any host/container where you have a docker capable CLI. It has been tested with Docker, Podman and Finch.  
+To use that feature, just set the env variable CONTAINERDIST in your shell session or invoke it direclty in the cmd:  
+`$ CONTAINERDIST="podman" ./vackup.sh`
 
 Note that for open files like databases,
 it's usually better to use their preferred backup tool to create a backup file,

vackup

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Docker Volume File Backup and Restore Tool
+# Docker/Container Volume File Backup and Restore Tool
 # Easily tar up a volume on a local (or remote) engine
 # Inspired by CLIP from Lukasz Lach
 
@@ -24,7 +24,8 @@ trap 'handle_error $LINENO' ERR
 usage() {
 cat <<EOF
 
-"Docker Volume Backup". Replicates image management commands for volumes.
+"Docker/Container Volume Backup". Replicates image management commands for volumes.
+You can also use an alternative Docker CMD compatible solution, if you set the env variable CONTAINERDIST. Example would be Podman
 
 export/import copies files between a host tarball and a volume. For making
   volume backups and restores.
@@ -83,10 +84,10 @@ fulldirname() {
 
   case "$DIRECTORY" in
     /*) ;;
-    .*) ;& # fallthrough
+    .*) ;; # fallthrough
     *) DIRECTORY="$(pwd)/$DIRECTORY" ;;
   esac
-  DIRECTORY=$(readlink -m "$DIRECTORY")
+  DIRECTORY=$(readlink -f "$DIRECTORY")
 
   echo "$DIRECTORY"
 }
@@ -104,7 +105,7 @@ cmd_export() {
         error usage 'Not enough arguments'
     fi
 
-    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME";
+    if ! "$CONTAINER" volume inspect --format '{{.Name}}' "$VOLUME_NAME";
     then
         error "Volume $VOLUME_NAME does not exist"
     fi
@@ -115,7 +116,7 @@ cmd_export() {
     DIRECTORY=$(fulldirname "$FILE_NAME")
     FILE_NAME=$(basename "$FILE_NAME")
 
-    if ! docker run --rm \
+    if ! "$CONTAINER" run --rm \
       -v "$VOLUME_NAME":/vackup-volume \
       -v "$DIRECTORY":/vackup \
       busybox \
@@ -135,10 +136,10 @@ cmd_import() {
         error usage 'Not enough arguments'
     fi
 
-    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME";
+    if ! "$CONTAINER" volume inspect --format '{{.Name}}' "$VOLUME_NAME";
     then
         echo "Warning: Volume $VOLUME_NAME does not exist, creating..."
-        docker volume create "$VOLUME_NAME"
+        "$CONTAINER" volume create "$VOLUME_NAME"
     fi
 
     if [ ! -r "$FILE_NAME" ]; then
@@ -154,7 +155,7 @@ cmd_import() {
     DIRECTORY=$(fulldirname "$FILE_NAME")
     FILE_NAME=$(basename "$FILE_NAME")
 
-    if ! docker run --rm \
+    if ! "$CONTAINER" run --rm \
       -v "$VOLUME_NAME":/vackup-volume \
       -v "$DIRECTORY":/vackup \
       busybox \
@@ -174,24 +175,24 @@ cmd_save() {
         error usage 'Not enough arguments'
     fi
 
-    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME";
+    if ! "$CONTAINER" volume inspect --format '{{.Name}}' "$VOLUME_NAME";
     then
         error "Volume $VOLUME_NAME does not exist"
     fi
 
-    if ! docker run \
+    if ! "$CONTAINER" run \
       -v "$VOLUME_NAME":/mount-volume \
       busybox \
       cp -Rp /mount-volume/. /volume-data/;
     then
         error 'Failed to start busybox container'
     fi
 
-    CONTAINER_ID=$(docker ps -lq)
+    CONTAINER_ID=$("$CONTAINER" ps -n 1 -q)
 
-    docker commit -m "saving volume $VOLUME_NAME to /volume-data" "$CONTAINER_ID" "$IMAGE_NAME"
+    "$CONTAINER" commit -m "saving volume $VOLUME_NAME to /volume-data" "$CONTAINER_ID" "$IMAGE_NAME"
 
-    docker container rm "$CONTAINER_ID"
+    "$CONTAINER" container rm "$CONTAINER_ID"
 
     echo "Successfully copied volume $VOLUME_NAME into image $IMAGE_NAME, under /volume-data"
 }
@@ -204,13 +205,13 @@ cmd_load() {
         error usage 'Not enough arguments'
     fi
 
-    if ! docker volume inspect --format '{{.Name}}' "$VOLUME_NAME";
+    if ! "$CONTAINER" volume inspect --format '{{.Name}}' "$VOLUME_NAME";
     then
       echo "Warning: Volume $VOLUME_NAME does not exist, creating..."
-      docker volume create "$VOLUME_NAME"
+      "$CONTAINER" volume create "$VOLUME_NAME"
     fi
 
-    if ! docker run --rm \
+    if ! "$CONTAINER" run --rm \
       -v "$VOLUME_NAME":/mount-volume \
       "$IMAGE_NAME" \
       cp -Rp /volume-data/. /mount-volume/;
@@ -221,6 +222,9 @@ cmd_load() {
     echo "Successfully copied /volume-data from $IMAGE_NAME into volume $VOLUME_NAME"
 }
 
+# Use other container management distributions, defaults to docker. Tested with Podman.
+CONTAINER=${CONTAINERDIST:-docker}
+# Standard command of the script
 COMMAND="$1"
 case "$COMMAND" in
   export) cmd_export "$@" ;;