allow all commands of proxmox-backup-client and improve help

pbc

@@ -1,24 +1,46 @@
 #!/usr/bin/env bash
 
 function usage() {
+  full=${1:-false}
   cat <<EOF
-Usage: $SCRIPT COMMAND
+Usage: $SCRIPT [-h] [-H] [-c config] command [OPTIONS]
 
 Helper script for proxmox-backup-client.
 
-Available commands:
+Options:
+  -h, --help           show this help message and exit
+  -H, --full-help      show this help message and all commands of proxmox-backup-client
+                       if it is available
+  -c, --config CONFIG  path to config file, default: $ETC_DIR/config
 
-    backup                               Run backup and print output to screen.
+Commands:
-    backup-cron                          Run backup and suppress output on success.
+
-    list                                 List groups, latest snapshots and archives.
+backup                               run backup and print output to screen
-    snapshot-list [GROUP]                List snapshots, sizes and archives.
+backup-cron                          run backup and suppress output on success
-    catalog-shell [SNAPSHOT [ARCHIVE]]   Run interactive shell to explore arhive contents
+list                                 list groups, latest snapshots and archives
-                                         and restore files/dirs selectively.
+snapshot-list [group]                list snapshots, sizes and archives
-    mount [SNAPSHOT [ARCHIVE [TARGET]]]  Mount snapshot archive locally.
+catalog-shell [snapshot [archive]]   run interactive shell to explore arhive contents
+                                     and restore files/dirs selectively
+mount [snapshot [archive [target]]]  mount snapshot archive locally
+install [--update]                   install proxmox-backup-client binary and dependencies
+                                     use --update to update the currently installed binary
 
-    install [--update]                   Install proxmox-backup-client binary and dependencies.
-                                         Use --update to update the currently installed binary.
 EOF
+  ! $full && cat <<EOF
+Other commands and options are passed to proxmox-backup-client.
+See \`$SCRIPT -H\` for a full help message including all available commands.
+
+EOF
+}
+
+function full_usage() {
+  usage true
+  [ ! -e "$PBC" ] && echo "Error: $PBC is not executable!" >&2 && return 254
+  echo "Commands of proxmox-backup-client:"
+  echo
+  "$PBC" help | tail -n +3
+  echo
+  return $?
 }
 
 function pbc-version() {
@@ -189,9 +211,6 @@ while [ -n "$1" ]; do
   shift
   if [ -z "$action" ]; then
     case "$opt" in
-      backup|backup-cron|list|snapshot-list|catalog-shell|mount|install)
-        action=$opt
-      ;;
       -c|--config)
         cfgfile=$1
         shift
@@ -201,17 +220,34 @@ while [ -n "$1" ]; do
         usage
         exit 0
       ;;
-      *)
+      -H|--full-help)
+        full_usage
+        exit 0
+      ;;
+      -*)
+        echo "Error: invalid option: $opt" >&2
+        echo
         usage
         exit 255
       ;;
+      *)
+        action=$opt
+      ;;
     esac
   elif [ "$action" == "install" ]; then
     case "$opt" in
       -u|--update)
         args+=('true')
       ;;
+      -*)
+        echo "Error: invalid option: $opt" >&2
+        echo
+        usage
+        exit 255
+      ;;
       *)
+        echo "Error: invalid argument: $opt" >&2
+        echo
         usage
         exit 255
       ;;
@@ -362,7 +398,6 @@ case "$action" in
     echo "$action successful!"
   ;;
   *)
-    usage
+    "$PBC" "$action" "${args[@]}" || exit $?
-    exit 1
   ;;
 esac