From mboxrd@z Thu Jan 1 00:00:00 1970 From: Giuseppe Bilotta Subject: [PATCH] gitweb: fixes to gitweb feature check code Date: Sun, 30 Nov 2008 02:34:04 +0100 Message-ID: <1228008844-12506-1-git-send-email-giuseppe.bilotta@gmail.com> References: Cc: Jakub Narebski , Petr Baudis , Junio C Hamano , Giuseppe Bilotta To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Sun Nov 30 02:35:08 2008 Return-path: Envelope-to: gcvg-git-2@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by lo.gmane.org with esmtp (Exim 4.50) id 1L6bDH-0002se-0N for gcvg-git-2@gmane.org; Sun, 30 Nov 2008 02:35:07 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753804AbYK3Bdu (ORCPT ); Sat, 29 Nov 2008 20:33:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753722AbYK3Bdu (ORCPT ); Sat, 29 Nov 2008 20:33:50 -0500 Received: from nf-out-0910.google.com ([64.233.182.188]:32973 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753634AbYK3Bdt (ORCPT ); Sat, 29 Nov 2008 20:33:49 -0500 Received: by nf-out-0910.google.com with SMTP id d3so1030365nfc.21 for ; Sat, 29 Nov 2008 17:33:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:cc:subject:date :message-id:x-mailer:in-reply-to:references; bh=4cVWjhFT0fnEL8jGOTuV+G3O3HPbKbX430e4k8QNGUw=; b=vXsxy9Q0kVBCrOmy0HvvFI5sebe50jXmOxmNuniVBpCnJzflpmj5GILnqi8E3jcx+m WpMLaD5fOtXm5sTkrBiE8G1ciHPsxo5B9/XsdhHpOd6mBgiFpml6v3sLkrziAt+Y7tJz J1qMtBW+uGStAZchHAQdTQsw8Hukutnsv+UKo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=NcV0Uyrop8dGU/6Sx6xZYEcYoK9GZFjwj6DuSbCpA7bAFbU5hUv9msrWgIh6VP4tWg pnWNaKQSQNrKlWEvuUAfFl/0rfu44PXh7OID4Q/KpQOwfw3sVb02KiTjuHKSWGIBcxPU ltFGcN8VERWgMD5xDhhUTbqqU5tXUUXCswsUc= Received: by 10.210.51.10 with SMTP id y10mr10831646eby.98.1228008827778; Sat, 29 Nov 2008 17:33:47 -0800 (PST) Received: from localhost ([78.15.11.205]) by mx.google.com with ESMTPS id 23sm173786eya.7.2008.11.29.17.33.46 (version=TLSv1/SSLv3 cipher=RC4-MD5); Sat, 29 Nov 2008 17:33:47 -0800 (PST) X-Mailer: git-send-email 1.5.6.5 In-Reply-To: Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: The gitweb_check_feature routine was being used for two different purposes: retrieving the actual feature value (such as the list of snapshot formats or the list of additional actions), and checking if a feature was enabled. This led to subtle bugs in feature checking code: gitweb_check_feature would return (0) for disabled features, so its use in scalar context would return true instead of false. To fix this issue and future-proof the code, we split feature value retrieval into its own gitweb_get_feature()function , and ensure that the boolean feature check function gitweb_check_feature() always returns a scalar (precisely, the first/only item in the feature value list). Usage of gitweb_check_feature() across gitweb is replaced with gitweb_get_feature() where appropriate, and list evaluation of gitweb_check_feature() is demoted to scalar evaluation to prevent ambiguity. The few previously incorrect uses of gitweb_check_feature() in scalar context are left untouched because they are now correct. Signed-off-by: Giuseppe Bilotta --- gitweb/gitweb.perl | 52 +++++++++++++++++++++++++++++++++++----------------- 1 files changed, 35 insertions(+), 17 deletions(-) diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl index 933e137..4246819 100755 --- a/gitweb/gitweb.perl +++ b/gitweb/gitweb.perl @@ -190,7 +190,9 @@ our %feature = ( # if there is no 'sub' key (no feature-sub), then feature cannot be # overriden # - # use gitweb_check_feature() to check if is enabled + # use gitweb_get_feature() to retrieve the value + # (an array) or gitweb_check_feature() to check if + # is enabled # Enable the 'blame' blob view, showing the last commit that modified # each line in the file. This can be very CPU-intensive. @@ -329,7 +331,8 @@ our %feature = ( 'default' => [0]}, ); -sub gitweb_check_feature { +# retrieve the value of a given feature, as an array +sub gitweb_get_feature { my ($name) = @_; return unless exists $feature{$name}; my ($sub, $override, @defaults) = ( @@ -344,6 +347,21 @@ sub gitweb_check_feature { return $sub->(@defaults); } +# check if a given feature is enabled or not, returning the first (and only) +# value of the feature. This allows us to write +# my $bool_feat = gitweb_check_feature('bool_feat'); +# or +# gitweb_check_feature('bool_feat') or somecode; +# instead of +# my ($bool_feat) = gitweb_get_feature('bool_feat'); +# or +# (gitweb_get_feature('bool_feat'))[0] or somecode; +# respectively +sub gitweb_check_feature { + return (gitweb_get_feature(@_))[0]; +} + + sub feature_blame { my ($val) = git_get_project_config('blame', '--bool'); @@ -767,7 +785,7 @@ our $git_dir; $git_dir = "$projectroot/$project" if $project; # list of supported snapshot formats -our @snapshot_fmts = gitweb_check_feature('snapshot'); +our @snapshot_fmts = gitweb_get_feature('snapshot'); @snapshot_fmts = filter_snapshot_fmts(@snapshot_fmts); # dispatch @@ -810,7 +828,7 @@ sub href (%) { } } - my ($use_pathinfo) = gitweb_check_feature('pathinfo'); + my $use_pathinfo = gitweb_check_feature('pathinfo'); if ($use_pathinfo) { # try to put as many parameters as possible in PATH_INFO: # - project name @@ -2101,7 +2119,7 @@ sub git_get_projects_list { $filter ||= ''; $filter =~ s/\.git$//; - my ($check_forks) = gitweb_check_feature('forks'); + my $check_forks = gitweb_check_feature('forks'); if (-d $projects_list) { # search in directory @@ -2947,7 +2965,7 @@ EOF } print "\n"; - my ($have_search) = gitweb_check_feature('search'); + my $have_search = gitweb_check_feature('search'); if (defined $project && $have_search) { if (!defined $searchtext) { $searchtext = ""; @@ -2961,7 +2979,7 @@ EOF $search_hash = "HEAD"; } my $action = $my_uri; - my ($use_pathinfo) = gitweb_check_feature('pathinfo'); + my $use_pathinfo = gitweb_check_feature('pathinfo'); if ($use_pathinfo) { $action .= "/".esc_url($project); } @@ -3084,7 +3102,7 @@ sub git_print_page_nav { $arg{'tree'}{'hash'} = $treehead if defined $treehead; $arg{'tree'}{'hash_base'} = $treebase if defined $treebase; - my @actions = gitweb_check_feature('actions'); + my @actions = gitweb_get_feature('actions'); my %repl = ( '%' => '%', 'n' => $project, # project name @@ -3454,7 +3472,7 @@ sub is_patch_split { sub git_difftree_body { my ($difftree, $hash, @parents) = @_; my ($parent) = $parents[0]; - my ($have_blame) = gitweb_check_feature('blame'); + my $have_blame = gitweb_check_feature('blame'); print "
\n"; if ($#{$difftree} > 10) { print(($#{$difftree} + 1) . " files changed:\n"); @@ -3968,7 +3986,7 @@ sub git_project_list_body { # actually uses global variable $project my ($projlist, $order, $from, $to, $extra, $no_header) = @_; - my ($check_forks) = gitweb_check_feature('forks'); + my $check_forks = gitweb_check_feature('forks'); my @projects = fill_project_list_info($projlist, $check_forks); $order ||= $default_projects_order; @@ -4428,7 +4446,7 @@ sub git_summary { my @taglist = git_get_tags_list(16); my @headlist = git_get_heads_list(16); my @forklist; - my ($check_forks) = gitweb_check_feature('forks'); + my $check_forks = gitweb_check_feature('forks'); if ($check_forks) { @forklist = git_get_projects_list($project); @@ -4457,7 +4475,7 @@ sub git_summary { } # Tag cloud - my $show_ctags = (gitweb_check_feature('ctags'))[0]; + my $show_ctags = gitweb_check_feature('ctags'); if ($show_ctags) { my $ctags = git_get_project_ctags($project); my $cloud = git_populate_project_tagcloud($ctags); @@ -4747,7 +4765,7 @@ sub git_blob { $expires = "+1d"; } - my ($have_blame) = gitweb_check_feature('blame'); + my $have_blame = gitweb_check_feature('blame'); open my $fd, "-|", git_cmd(), "cat-file", "blob", $hash or die_error(500, "Couldn't cat $file_name, $hash"); my $mimetype = blob_mimetype($fd, $file_name); @@ -4840,7 +4858,7 @@ sub git_tree { my $ref = format_ref_marker($refs, $hash_base); git_header_html(); my $basedir = ''; - my ($have_blame) = gitweb_check_feature('blame'); + my $have_blame = gitweb_check_feature('blame'); if (defined $hash_base && (my %co = parse_commit($hash_base))) { my @views_nav = (); if (defined $file_name) { @@ -5838,7 +5856,7 @@ insensitive).

commit
The commit messages and authorship information will be scanned for the given pattern.
EOT - my ($have_grep) = gitweb_check_feature('grep'); + my $have_grep = gitweb_check_feature('grep'); if ($have_grep) { print <grep @@ -5855,7 +5873,7 @@ EOT
committer
Name and e-mail of the committer and date of commit will be scanned for the given pattern.
EOT - my ($have_pickaxe) = gitweb_check_feature('pickaxe'); + my $have_pickaxe = gitweb_check_feature('pickaxe'); if ($have_pickaxe) { print <pickaxe @@ -5907,7 +5925,7 @@ sub git_shortlog { sub git_feed { my $format = shift || 'atom'; - my ($have_blame) = gitweb_check_feature('blame'); + my $have_blame = gitweb_check_feature('blame'); # Atom: http://www.atomenabled.org/developers/syndication/ # RSS: http://www.notestips.com/80256B3A007F2692/1/NAMO5P9UPQ -- 1.5.6.5