Add ability to have custom scripts

README.md

@@ -41,8 +41,16 @@ It uses cron to run the backups at a time you can configure in `data/borgmatic.d
 | CRON_COMMAND | Command cron will run | borgmatic --stats -v 0 2>&1 | borgmatic --stats -v 0 2>&1 |
 | EXTRA_CRON | Extra cron lines | 0 5 2 * * command1 | Empty |
 
-## Breaking change
-dockercli tag has been removed as there is now a variable to install it at container startup.
+## Customising the container
+Simply mount a volume located at /custom-cont-init.d and add any scripts you want. These scripts can contain logic for installing packages, copying over custom files to other locations, or installing plugins.
+
+For example:
+```yaml
+services:
+  borgmatic:
+    volumes:
+      - /home/foo/my-custom-files:/custom-cont-init.d:ro
+```
 
 ### Usage
 

base-fullbuild/root/etc/s6-overlay/s6-rc.d/init-custom-packages/run

@@ -2,13 +2,13 @@
 
 # Install DockerCLI if true
 if [ "${DOCKERCLI}" == "true" ]; then
-  echo "Installing Docker CLI and Compose..."
+  echo "[custom-init] Installing Docker CLI and Compose..."
   apk add -U --quiet docker-cli docker-cli-compose
 fi
 
 # Install additional packages
 if [ -v EXTRA_PKGS ]
 then
-    echo Installing extra packages: "$EXTRA_PKGS"
+    echo "[custom-init] Installing extra packages: $EXTRA_PKGS"
     apk add -U --quiet $EXTRA_PKGS
 fi

base-fullbuild/root/etc/s6-overlay/s6-rc.d/init-custom-scripts/run

@@ -0,0 +1,21 @@
+#!/usr/bin/with-contenv bash
+
+# Directories
+SCRIPTS_DIR="/custom-cont-init.d"
+
+# Make sure custom init directory exists and has files in it
+if [[ -e "${SCRIPTS_DIR}" ]] && [[ -n "$(/bin/ls -A ${SCRIPTS_DIR} 2>/dev/null)" ]]; then
+    echo "[custom-init] Files found, executing"
+    for SCRIPT in "${SCRIPTS_DIR}"/*; do
+        NAME="$(basename "${SCRIPT}")"
+        if [[ -f "${SCRIPT}" ]]; then
+            echo "[custom-init] ${NAME}: executing..."
+            /bin/bash "${SCRIPT}"
+            echo "[custom-init] ${NAME}: exited $?"
+        elif [[ ! -f "${SCRIPT}" ]]; then
+            echo "[custom-init] ${NAME}: is not a file"
+        fi
+    done
+else
+    echo "[custom-init] No custom files found, skipping..."
+fi

base-fullbuild/root/etc/s6-overlay/s6-rc.d/init-custom-scripts/type

@@ -0,0 +1 @@
+oneshot

base-fullbuild/root/etc/s6-overlay/s6-rc.d/init-custom-scripts/up

@@ -0,0 +1 @@
+/etc/s6-overlay/s6-rc.d/init-custom-scripts/run