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 <giuseppe.bilotta@xxxxxxxxx>
---
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(<feature>) to check if <feature> is enabled
+ # use gitweb_get_feature(<feature>) to retrieve the <feature> value
+ # (an array) or gitweb_check_feature(<feature>) to check if <feature>
+ # 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 $projects_list) {
# search in directory
@@ -2947,7 +2965,7 @@ EOF
}
print "</div>\n";
- my ($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 $have_blame = gitweb_check_feature('blame');
print "<div class=\"list_head\">\n";
if ($#{$difftree} > 10) {
print(($#{$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 $file_name) {
@@ -5838,7 +5856,7 @@ insensitive).</p>
<dt><b>commit</b></dt>
<dd>The commit messages and authorship information will be scanned for the given pattern.</dd>
EOT
- my ($have_grep) = gitweb_check_feature('grep');
+ my $have_grep = gitweb_check_feature('grep');
if ($have_grep) {
print <<EOT;
<dt><b>grep</b></dt>
@@ -5855,7 +5873,7 @@ EOT
<dt><b>committer</b></dt>
<dd>Name and e-mail of the committer and date of commit will be scanned for the given pattern.</dd>
EOT
- my ($have_pickaxe) = gitweb_check_feature('pickaxe');
+ my $have_pickaxe = gitweb_check_feature('pickaxe');
if ($have_pickaxe) {
print <<EOT;
<dt><b>pickaxe</b></dt>
@@ -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
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