[PATCH 2/6] GITWEB - Missmatching git w/ gitweb

["John 'Warthog9' Hawley" <warthog9@kernel.org>]

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This adds $missmatch_git so that gitweb can run with a miss-matched
git install.  Gitweb, generally, runs fine on a very broad range of
git versions, but it's not always practicle or useful to upgrade it
every time you upgrade git.

This allows the administrator to realize they are miss-matched, and
should they be so inclined, disable the check entirely and run in
a miss-matched fasion.

This is more here to give an obvious warning as to whats going on
vs. silently failing.

Signed-off-by: John 'Warthog9' Hawley <warthog9@eaglescrag.net>
---
 gitweb/gitweb.perl |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)


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diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 813e48f..d84f4c0 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -221,6 +221,9 @@ our %avatar_size = (
 	'double'  => 32
 );
 
+# This is here to allow for missmatch git & gitweb versions
+our $missmatch_git = '';
+
 # Used to set the maximum load that we will still respond to gitweb queries.
 # if we exceed this than we do the processing to figure out if there's a mirror
 # and redirect to it, or to just return 503 server busy
@@ -579,6 +582,25 @@ if (get_loadavg() > $maxload) {
 our $git_version = qx("$GIT" --version) =~ m/git version (.*)$/ ? $1 : "unknown";
 $number_of_git_cmds++;
 
+# There's a pretty serious flaw that we silently fail if git doesn't find something it needs
+# a quick and simple check is to have gitweb do a simple check - are we running on the same
+# version of git that we shipped with - if not, throw up an error so that people doing
+# first installs don't have to debug perl to figure out whats going on
+if (
+	$git_version ne $version
+	&&
+	$missmatch_git eq ''
+){
+	git_header_html();
+	print "<p><b>*** Warning ***</b></p>\n";
+	print "<p>\n";
+	print "This version of gitweb was compiled for <b>$version</b> however git version <b>$git_version</b> was found<br/>\n";
+	print "If you are sure this version of git works with this version of gitweb - please define <b>\$missmatch_git</b> to a non empty string in your git config file.\n";
+	print "</p>\n";
+	git_footer_html();
+	exit;
+}
+
 $projects_list ||= $projectroot;
 
 # ======================================================================