gitweb: supply '-n' to gzip for identical output

For projects that do not release official archives, gitweb's snapshot
feature would be an excellent alternative, and but without the '-n'
('--no-name') argument, gzip includes a timestamp in output which results
in different files.  Because some systems hash/checksum downloaded files
to ensure integrity of the tarball (e.g FreeBSD), it is desirable to
produce tarballs in a reproducible way for that purpose.

Whilst '--no-name' is more descriptive, the long version of the flag is
not supported on all systems.  In particular, OpenBSD does not appear to
support it.

Supply '-n' to gzip to exclude timestamp from output and produce idential
output every time.

Signed-off-by: Fraser Tweedale <frase@frase.id.au>
Acked-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index ee69ea683a..f8db40a1c2 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -186,7 +186,7 @@ our %known_snapshot_formats = (
 		'type' => 'application/x-gzip',
 		'suffix' => '.tar.gz',
 		'format' => 'tar',
-		'compressor' => ['gzip']},
+		'compressor' => ['gzip', '-n']},
 
 	'tbz2' => {
 		'display' => 'tar.bz2',