[PATCH] gitweb: do misparse nonnumeric content tag files that contain a digit

[Jonathan Nieder <jrnieder@gmail.com>]

v1.7.6-rc0~27^2~4 (gitweb: Change the way "content tags" ('ctags') are
handled, 2011-04-29) tried to make gitweb's tag cloud feature more
intuitive for webmasters by checking whether the ctags/<label> under
a project's .git dir contains a number (representing the strength of
association to <label>) before treating it as one.

So after that change, after putting '$feature{'ctags'}{'default'} =
[1];' in your $GITWEB_CONFIG, you could do

	echo Linux >.git/ctags/linux

and gitweb would treat that as a request to tag the current repository
with the Linux tag, instead of the previous behavior of writing an
error page embedded in the projects list that triggers error messages
from Chromium and Firefox about malformed XML.

Unfortunately the pattern (\d+) used to match numbers is too loose,
and the "XML declaration allowed only at the start of the document"
error can still be experienced if you write "Linux-2.6" in place of
"Linux" in the example above.  Fix it by tightening the pattern to
^\d+$.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Hi,

Jakub Narebski wrote:
>> On Thu, Mar 03, 2011 at 01:42:15AM +0100, Jakub Narebski wrote:

>>> 1. Hardening parsing of ctags files, so that gitweb does not crash on
>>>    malformed entries, but e.g. just ignores them.
>
> Done.

Sorry for a (long-) delayed response.  Based on testing rc0 today, it
works well; thanks!  Patch to fix a small detail noticed while trying
'-1' follows.

 gitweb/gitweb.perl                     |    2 +-
 t/t9500-gitweb-standalone-no-errors.sh |    8 ++++++++
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index ebf2d1c..1b83a8d 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -2644,7 +2644,7 @@ sub git_get_project_ctags {
 			close $ct;
 
 			(my $ctag = $tagfile) =~ s#.*/##;
-			if ($val =~ /\d+/) {
+			if ($val =~ /^\d+$/) {
 				$ctags->{$ctag} = $val;
 			} else {
 				$ctags->{$ctag} = 1;
diff --git a/t/t9500-gitweb-standalone-no-errors.sh b/t/t9500-gitweb-standalone-no-errors.sh
index f5648a6..5329715 100755
--- a/t/t9500-gitweb-standalone-no-errors.sh
+++ b/t/t9500-gitweb-standalone-no-errors.sh
@@ -644,6 +644,14 @@ test_expect_success \
 	'ctags: search projects by non existent tag' \
 	'gitweb_run "by_tag=non-existent"'
 
+test_expect_success \
+	'ctags: malformed tag weights' \
+	'mkdir -p .git/ctags &&
+	 echo "not-a-number" > .git/ctags/nan &&
+	 echo "not-a-number-2" > .git/ctags/nan2 &&
+	 echo "0.1" >.git/ctags/floating-point &&
+	 gitweb_run'
+
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-- 
1.7.6.rc0