--- a/check	Fri Jan 10 11:20:30 2014 +0100
+++ b/check	Sat Jan 11 17:20:05 2014 +0100
@@ -1,4 +1,5 @@
 #! /usr/bin/perl
+# source: https://ssl.schlittermann.de/hg/ius/nagios/nagios-plugin-amanda-client
 
 use 5.010;
 use strict;
@@ -28,20 +29,29 @@
 sub warning;
 sub critical;
 sub unknown;
+sub verbose;
+sub unique { my %h; @h{@_} = (); keys %h }
 
 $SIG{__DIE__} = sub { unknown @_ unless $^S };
 
 exit main @ARGV;
 
+
 #----
 
 sub main {
+    my $opt_verbose = 0;
 
     GetOptions(
         'h|help' => sub { pod2usage(-verbose => 1, -exit => 0) },
         'm|man'  => sub { pod2usage(-verbose => 2, -exit => 0) },
+        'v|verbose' => \$opt_verbose,
     ) or pod2usage;
 
+    if ($opt_verbose) { *::verbose = sub { say '# ', @_ } }
+    else { *::verbose = sub { } }
+
+
     # test needs to be run as root:* or as backup:backup
     my $USER  = 'backup';
     my $CFDIR = '/etc/amanda';
@@ -51,6 +61,7 @@
 
     # amservice needs to be suid root, but executable
     # by the backup user/group
+    verbose q{checking permissions for `amservice'};
     eval { check_perms find_tool('amservice'), 04750, 'root', $) }
       or unknown $@;
 
@@ -58,13 +69,14 @@
     # here we suppose that it's possible to find strings like
     # 'conf "foo"' in files named 'amanda-client.conf' below /etc/amanda
 
-    my @confs = eval { config_names $CFDIR }
+    verbose qq{find config names from $CFDIR};
+    my @confs = sort +unique eval { config_names $CFDIR }
       or unknown $@;
 
     eval { amchecks @confs } or critical $@;
 
     my @dles = eval { amlists @confs } or critical $@;
-    ok @dles;
+    ok 'config: ' .join(', ', @confs), @dles;
 
     # never reached
     return 0;
@@ -94,6 +106,8 @@
     }
     endgrent;
     $) = "@groups";
+
+    verbose "su to $uid:$gid";
     setgid $gid;
     setuid $uid;
 }
@@ -249,6 +263,10 @@
 
 Show the man page of this tool.
 
+=item B<-v>|B<--verbose>
+
+Show what's going only. Many for debugging purpose. (default: off)
+
 =back
 
 =head1 PREPARATIONS
@@ -293,4 +311,4 @@
 
 =cut
 
-
+# vim:et ts=4 sw=4 aw ai: