gitweb: allow configurations that change with each request

gitolite's contrib/gitweb/gitweb.conf includes:

	$ENV{GL_USER} = $cgi->remote_user || "gitweb";

which is useful for setups where a user has to be authenticated
to access certain repos.  Perhaps other typical configurations
change per session in other ways, too.

v1.7.2-rc2~6 (gitweb: Move evaluate_gitweb_config out of run_request,
2010-07-05) broke such configurations for a speedup, by loading
the configuration once per FastCGI process.

Probably in the end there should be a way to specify in the
configuration whether a particular installation wants the speedup or
the flexibility.  But for now it is easier to just undo the relevant
change.

This partially reverts commit 869d58813b.

Reported-by: Julio Lajara <julio.lajara@alum.rpi.edu>
Analysis-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -1037,8 +1037,12 @@ sub run_request {
 	reset_timer();
 
 	evaluate_uri();
+	evaluate_gitweb_config();
 	check_loadavg();
 
+	# $projectroot and $projects_list might be set in gitweb config file
+	$projects_list ||= $projectroot;
+
 	evaluate_query_params();
 	evaluate_path_info();
 	evaluate_and_validate_params();
@@ -1086,12 +1090,8 @@ sub evaluate_argv {
 
 sub run {
 	evaluate_argv();
-	evaluate_gitweb_config();
 	evaluate_git_version();
 
-	# $projectroot and $projects_list might be set in gitweb config file
-	$projects_list ||= $projectroot;
-
 	$pre_listen_hook->()
 		if $pre_listen_hook;