sh.zio.backup: add ability to run arbitrary restic commands

usr/local/bin/sh.zio.backup

@@ -21,10 +21,9 @@ function download_restic() {
     restic_path="/tmp/restic-$restic_version"
     restic_archive_path="${restic_path}_$(date +%s).${restic_download_url##*.}"
 
+    if [[ ! -f "$restic_path" ]]; then
         say info "Downloading Restic ($restic_version)..."
 
-    rm -f "$restic_path"
-
         curl -L -s -o "$restic_archive_path" "$restic_download_url"
         bzip2 -dc "$restic_archive_path" > "$restic_path"
         rm -f "$restic_archive_path"
@@ -33,6 +32,8 @@ function download_restic() {
 
         if [[ ! "$(echo "$("$restic_path" version)")" == "restic $restic_version"* ]]; then
             die "Unexpected output from '$restic_path version'"
+            rm -f "$restic_path"
+        fi
     fi
 }
 
@@ -60,7 +61,7 @@ function invoke_restic() {
     if [[ -z $command ]]; then
         say warning "No command specified. Not running"
     elif [[ $command == "self-update" ]]; then
-        say warning "Command 'self-update' not supported. Not running"
+        say warning "Command '$command' not supported. Not running"
     else
         "$restic_path" \
             --cache-dir "$cache_dir" \
@@ -159,6 +160,7 @@ download_restic 0.16.0
 test_file "$restic_repo_file"
 test_file "$restic_repo_passwd_file"
 
+if [[ -z "$1" ]]; then
     say info "Running backup scripts..."
 
     if ! [[ "$(ls -A $backup_scripts_dir)" ]]; then
@@ -195,5 +197,9 @@ for backup_script in $backup_scripts_dir/*; do
     done
 
     say primary "$(repeat "-" 80)"
-
-#sudo rm -f "$restic_path"
+else
+    command="$1"
+    arguments="${@:2}"
+    say info "Running: $restic_path $command $arguments"
+    invoke_restic $command $arguments
+fi