Add option to get the sig file for an image instead of the ndz file.

utils/spewimage.in

 #!/usr/bin/perl -wT
 #
-# Copyright (c) 2000-2013 University of Utah and the Flux Group.
+# Copyright (c) 2000-2015 University of Utah and the Flux Group.
 # 
 # {{{EMULAB-LICENSE
 # 
@@ -38,9 +38,10 @@ sub usage()
 	"Spew an image file to a (widearea) node.\n";
     exit(-1);
 }
-my $optlist   = "t:k:h";
+my $optlist   = "t:k:hs";
 my $debug     = 0;
 my $headonly  = 0;
+my $sigfile   = 0;
 my $access_key;
 my $timestamp;			# GM Time.
 
@@ -98,6 +99,9 @@ if (! getopts($optlist, \%options)) {
 if (defined($options{"h"})) {
     $headonly = 1;
 }
+if (defined($options{"s"})) {
+    $sigfile = 1;
+}
 if (defined($options{"k"})) {
     $access_key = $options{"k"};
 
@@ -141,7 +145,8 @@ exit(0);
 sub SpewImage()
 {
     my $file = $image->path();
-    
+    $file   .= ".sig" if ($sigfile);
+
     open(FD, "< $file")
 	or fatal("Could not open $file!\n");
 
@@ -205,6 +210,8 @@ sub VerifyImage()
     # have provided proper access key. 
     #
     my $file = $image->path();
+    $file   .= ".sig" if ($sigfile);
+    
     if (! -r $file) {
 	if ($debug) {
 	    print STDERR "Cannot read $file\n";

www/spewimage.php

 <?php
 #
-# Copyright (c) 2003-2014 University of Utah and the Flux Group.
+# Copyright (c) 2003-2015 University of Utah and the Flux Group.
 # 
 # {{{EMULAB-LICENSE
 # 
@@ -53,7 +53,8 @@ if (!isset($_SERVER["SSL_PROTOCOL"])) {
 #
 $reqargs = RequiredPageArguments("image",	PAGEARG_IMAGE,
 				 "access_key",	PAGEARG_STRING);
-$optargs = OptionalPageArguments("stamp",       PAGEARG_INTEGER);
+$optargs = OptionalPageArguments("stamp",       PAGEARG_INTEGER,
+                                 "sigfile",     PAGEARG_BOOLEAN);
 
 #
 # A cleanup function to keep the child from becoming a zombie, since
@@ -80,7 +81,9 @@ register_shutdown_function("SPEWCLEANUP");
 $imageid    = $image->imageid();
 $versid     = $image->versid();
 $access_key = escapeshellarg($access_key);
-$arg        = (isset($stamp) ? "-t " . escapeshellarg($stamp) : "");
+$arg        = "";
+$arg       .= (isset($stamp) ? "-t " . escapeshellarg($stamp) : "");
+$arg       .= (isset($sigfile) && $sigfile ? "-s " : "");
 $group      = $image->Group();
 $pid        = $group->pid();
 $unix_gid   = $group->unix_gid();