gitweb: selectable configurations that change with each request

Allow selecting whether configuration file should be (re)parsed on each
request (the default, for backward compatibility with configurations that
change per session, see commit 7f425db (gitweb: allow configurations that
change with each request, 2010-07-30)), or whether should it be parsed only
once (for performance speedup for persistent environments, though currently
only FastCGI is able to make use of it, when flexibility is not important).

You can also have configuration file parsed only once, but have parts of
configuration (re)evaluated once per each request.

This is done by introducing $per_request_config variable: if set to code
reference, this code would be run once per request, while config file would
be parsed only once.  For example gitolite's contrib/gitweb/gitweb.conf
fragment mentioned in 7f425db could be rewritten as

  our $per_request_config = sub {
  	$ENV{GL_USER} = ($cgi && $cgi->remote_user) || "gitweb";
  };

to make use of this feature.

If $per_request_config is not a code reference, it is taken to be boolean
variable, to choose between running config file for each request
(flexibility), and running config file only once (performance in
persistent environments).

The default value for $per_request_config is 1 (true), which means that
old configuration that require to change per session (like gitolite's)
will keep working.

While at it, make it so evaluate_git_version() is run only once.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/README

@@ -246,6 +246,13 @@ not include variables usually directly set during build):
    http://www.andre-simon.de due to assumptions about parameters and output).
    Useful if highlight is not installed on your webserver's PATH.
    [Default: highlight]
+ * $per_request_config
+   If set to code reference, it would be run once per each request.  You can
+   set parts of configuration that change per session, e.g. by setting it to
+     sub { $ENV{GL_USER} = $cgi->remote_user || "gitweb"; }
+   Otherwise it is treated as boolean value: if true gitweb would process
+   config file once per request, if false it would process config file only
+   once.  The default is true.
 
 Projects list file format
 ~~~~~~~~~~~~~~~~~~~~~~~~~

gitweb/gitweb.perl

@@ -601,6 +601,14 @@ sub filter_snapshot_fmts {
 		!$known_snapshot_formats{$_}{'disabled'}} @fmts;
 }
 
+# If it is set to code reference, it is code that it is to be run once per
+# request, allowing updating configurations that change with each request,
+# while running other code in config file only once.
+#
+# Otherwise, if it is false then gitweb would process config file only once;
+# if it is true then gitweb config would be run for each request.
+our $per_request_config = 1;
+
 our ($GITWEB_CONFIG, $GITWEB_CONFIG_SYSTEM);
 sub evaluate_gitweb_config {
 	our $GITWEB_CONFIG = $ENV{'GITWEB_CONFIG'} || "++GITWEB_CONFIG++";
@@ -1070,12 +1078,22 @@ sub reset_timer {
 	our $number_of_git_cmds = 0;
 }
 
+our $first_request = 1;
 sub run_request {
 	reset_timer();
 
 	evaluate_uri();
-	evaluate_gitweb_config();
-	evaluate_git_version();
+	if ($first_request) {
+		evaluate_gitweb_config();
+		evaluate_git_version();
+	}
+	if ($per_request_config) {
+		if (ref($per_request_config) eq 'CODE') {
+			$per_request_config->();
+		} elsif (!$first_request) {
+			evaluate_gitweb_config();
+		}
+	}
 	check_loadavg();
 
 	# $projectroot and $projects_list might be set in gitweb config file
@@ -1129,6 +1147,7 @@ sub evaluate_argv {
 sub run {
 	evaluate_argv();
 
+	$first_request = 1;
 	$pre_listen_hook->()
 		if $pre_listen_hook;
 
@@ -1141,6 +1160,7 @@ sub run {
 
 		$post_dispatch_hook->()
 			if $post_dispatch_hook;
+		$first_request = 0;
 
 		last REQUEST if ($is_last_request->());
 	}