Template out a backup module for desktops

Kinda primitive, but the idea is that I can just link shit into ~/.backups and it'll get backed up

roles/desktop/tasks/main.yml

@@ -57,4 +57,9 @@
         state: started
       loop:
         - syncthing@salt.service
+    - name: Template out backup module
+      template:
+        src: "backup.sh"
+        dest: "/opt/backups/modules/desktop.sh"
+        mode: "0600"
   become: yes

roles/desktop/templates/backup.sh

@@ -0,0 +1,41 @@
+#! /bin/bash
+#
+# desktop.sh
+# Backup script for desktops. Meant to be sourced by our main backup script
+# Copyright (C) 2020 Vintage Salt <rehashedsalt@cock.li>
+#
+# Distributed under terms of the MIT license.
+#
+
+set -e
+
+export OUTDIR="$BACKUPSDIR/{{ dokuwiki_url }}"
+retention=7 # 7-day retention period
+
+# Sanity checks
+if [ -z "$BACKUPSDIR" ]; then
+	log "BACKUPSDIR was undefined. Run the main backup script instead of this one."
+	return 1
+fi
+if ! [ -d "$OUTDIR" ]; then
+	if ! mkdir "$OUTDIR"; then
+		log "Unable to find or create output directory: $OUTDIR"
+		return 2
+	fi
+fi
+
+# Purge oldest backup if we need to
+currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
+if (( currentbackupcount >= retention )); then
+	lastbackup="$(find "$OUTDIR" -name \*.tar.gz 2>/dev/null | sort | head -n 1)"
+	if [ -f "$lastbackup" ]; then
+		log "Removing old backup: $lastbackup"
+		rm "$lastbackup"
+	fi
+fi
+# WE MAKE BACKUP NOW SERGEI
+for dir in /home/*; do
+	username="$(basename -- "$dir")"
+	tar czhf "$OUTDIR/desktop-$username-{{ inventory_hostname }}-$(date -Iseconds).tar.gz" "$dir/.backup"
+done
+