Support pigz compression

virt-backup

@@ -157,6 +157,10 @@ elsif ($opts{compress} eq 'plzip'){
     $opts{compext} = ".lz";
     $opts{compcmd} = "plzip -c";
 }
+elsif ($opts{compress} eq 'pigz'){
+    $opts{compext} = ".gz";
+    $opts{compcmd} = "pigz -c";
+}
 # Default is gzip
 elsif (($opts{compress} eq 'gzip') || ($opts{compress} eq '')) {
     $opts{compext} = ".gz";
@@ -742,7 +746,7 @@ sub usage{
         "or RAID10)\n\n" .
     "\t--snapsize=<snapsize>: The amount of space to use for snapshots. Use the same format as -L option of lvcreate. " .
         "eg: --snapsize=15G. Default is 5G. For thinly provisionned volumes, this will be ignored\n\n" .
-    "\t--compress[=[gzip|bzip2|pbzip2|lzop|xz|lzip|plzip]]: On the fly compress the disks images during the dump. If you " .
+    "\t--compress[=[gzip|bzip2|pbzip2|lzop|xz|lzip|plzip|pigz]]: On the fly compress the disks images during the dump. If you " .
         "don't specify a compression algo, gzip will be used. For the convert action, the compression uses " .
         "the internal qcow2 compression feature, and so, it ignores the compression format, in this case --compress " .
         "is just seen as a boolean flag\n\n" .