Add git version to gitweb output

Add git-core binaries used version as the comment at the beginning of HTML
output, just below the comment with version of git web interface version.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/gitweb/gitweb.cgi b/gitweb/gitweb.cgi
index 89224e6..87ec565 100755
--- a/gitweb/gitweb.cgi
+++ b/gitweb/gitweb.cgi
@@ -29,6 +29,14 @@
 # location of the git-core binaries
 my $gitbin = "/usr/bin";
 
+# version of the git-core binaries
+my $git_version = qx($gitbin/git --version);
+if ($git_version =~ m/git version (.*)$/) {
+	$git_version = $1;
+} else {
+	$git_version = "unknown";
+}
+
 # location for temporary files needed for diffs
 my $git_temp = "/tmp/gitweb";
 
@@ -288,11 +296,12 @@
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
 <!-- git web interface v$version, (C) 2005-2006, Kay Sievers <kay.sievers\@vrfy.org>, Christian Gierke -->
+<!-- git core binaries version $git_version -->
 <head>
 <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
 <meta name="robots" content="index, nofollow"/>
-<link rel="stylesheet" type="text/css" href="$stylesheet"/>
 <title>$title</title>
+<link rel="stylesheet" type="text/css" href="$stylesheet"/>
 $rss_link
 </head>
 <body>
@@ -816,7 +825,7 @@
 	$key =~ s/^gitweb\.//;
 	return if ($key =~ m/\W/);
 
-	my $val = qx(git-repo-config --get gitweb.$key);
+	my $val = qx($gitbin/git-repo-config --get gitweb.$key);
 	return ($val);
 }