1 files changed, 40 insertions, 0 deletions
diff --git a/arch-system/backup-sudo b/arch-system/backup-sudo
new file mode 100755
index 0000000..90590e0
--- /dev/null
+++ b/arch-system/backup-sudo
@@ -0,0 +1,40 @@
+#!/bin/bash -e
+
+validate_path() {
+    # validate path
+    targetpath="$(realpath -m -- "$1")"
+    if [[ "$targetpath" != /.snapshots/* ]]; then
+        echo "Invalid path given." >&2
+        exit 2
+    fi
+}
+
+case "$1" in
+    snapshot)
+        validate_path "$2"
+        # small race, but shouldn't matter
+        if ! btrfs subvolume show "$3" > /dev/null 2>&1; then
+            echo "Not a btrfs subvolume." >&2
+            exit 3
+        fi
+        touch -c -- "$3"
+        btrfs subvolume snapshot -r -- "$3" "$2"
+        ;;
+    delete_snapshot)
+        validate_path "$2"
+        btrfs subvolume delete -- "$2"
+        ;;
+    mount)
+        validate_path "$2"
+        mkdir -p /backup
+        mount --bind -- "$2" /backup
+        ;;
+    cleanup)
+        umount /backup 2> /dev/null || true
+        rm -df /backup
+        ;;
+    *)
+        echo "No command specified." >&2
+        exit 1
+        ;;
+esac