sh.zio.backup: add dump command

usr/local/bin/sh.zio.backup

@@ -196,6 +196,7 @@ function prune_backup() {
 
 function get_dump_dir() {
     service="$1"
+
     specific_dumps_dir="/srv/dumps/$host/$service/$(date +"%Y%m%d%H%M%S")"
     mkdir -p "$specific_dumps_dir"
     [[ $? == "0" ]] && echo "$specific_dumps_dir"
@@ -225,6 +226,9 @@ Usage:
     $me_filename <script>
         Run a specific script from a given path
 
+    $me_filename dump <snapshot ID>
+        Restore <snapshot ID> to /srv/dumps/$host/restic/<snapshot ID>/
+
     $me_filename <command> [arguments]
         Execute 'restic' with arbitrary commands and optional arguments
 
@@ -282,11 +286,19 @@ if [[ -z "$1" || -f "$1" ]]; then
         --host "$host" \
         --tag "$(basename "$0")" \
         | sed -E ":begin;$!N;s/$(basename "$0")\n\s+?//;tbegin;P;D"
+elif [[ "$1" == "dump" ]]; then
+    snapshot="$2"
+
+    [[ -z "$snapshot" ]] && die "No snapshot ID provided"
+
+    invoke_restic restore \
+        --target "/srv/dumps/$host/restic/$snapshot" \
+        "$snapshot"
 else
     command="$1"
     arguments="${@:2}"
 
-    [[ $command = "purge" ]] && command="prune"
+    [[ $command == "purge" ]] && command="prune"
 
     say info "Running: $restic_path $command $arguments"
     invoke_restic $command $arguments