Merge branch 'hooks' into 'master'

post_run and pre_run hook support

See merge request !1

README.md

@@ -100,4 +100,12 @@ exclude_files: {}
 # Only supportet in restic based backups
 # Ignored in vm-via-hypervisor mode
 include_files: {}
+
+# Run one or more hooks before and after each (standalone) backup run
+# Items are executed in bash in their own subshell
+hooks:
+  pre_run:
+  - mysqldump --all-databases > /var/backups/mysql-backup.sql
+  post_run:
+  - rm /var/backups/mysql-backup.sql
 ```

defaults/main.yml

@@ -48,3 +48,6 @@ backups:
     '/root/.ansible/*': true
   include_files:
     '/': true
+  hooks:
+    pre_run: []
+    post_run: []

templates/backup-standalone.j2

@@ -3,7 +3,17 @@ set -euo pipefail
 
 test -f "/etc/backup-client/enabled" || { echo "Standalone backup is disabled"; exit 0; }
 
+{% if backups.hooks.pre_run %}
+echo "Running pre_run hooks"
+{% for cmd in backups.hooks.pre_run %}
+( {{ cmd }} )
+{% endfor %}
+echo "Hooks done"
+{% endif %}
+
 {% if backup_backend == 'restic' %}
+# Run restic in subshell to avoid leaking environment to post_run hooks
+(
 	# restic backend
 	source /etc/backup-client/restic.env
 
@@ -15,9 +25,16 @@ restic backup \
 		--exclude "${RESTIC_REPOSITORY}" \
 		--exclude-file "/etc/backup-client/exclude_files" \
 		--files-from "/etc/backup-client/include_files"
-
-
+)
 {% endif %}
 {% if not backup_backend %}
 echo "Noop, backup is handled external"
 {% endif %}
+
+{% if backups.hooks.post_run %}
+echo "Running post_run hooks"
+{% for cmd in backups.hooks.post_run %}
+( {{ cmd }} )
+{% endfor %}
+echo "Hooks done"
+{% endif %}