Allow extra-branch-refs feature to tell gitweb to show refs from
additional hierarchies in addition to branches in the list-of-branches
view.

Signed-off-by: Krzesimir Nowak <krzesi...@endocode.com>
Reviewed-by: Junio C Hamano <gits...@pobox.com>
Reviewed-by: Jakub Narębski <jna...@gmail.com>
---
 Documentation/gitweb.conf.txt | 37 +++++++++++++++++++
 gitweb/gitweb.perl            | 85 +++++++++++++++++++++++++++++++++++++------
 2 files changed, 110 insertions(+), 12 deletions(-)

diff --git a/Documentation/gitweb.conf.txt b/Documentation/gitweb.conf.txt
index e2113d9..5a77452 100644
--- a/Documentation/gitweb.conf.txt
+++ b/Documentation/gitweb.conf.txt
@@ -849,6 +849,43 @@ time zones in the form of "+/-HHMM", such as "+0200".
 +
 Project specific override is not supported.
 
+extra-branch-refs::
+       List of additional directories under "refs" which are going to
+       be used as branch refs. For example if you have a gerrit setup
+       where all branches under refs/heads/ are official,
+       push-after-review ones and branches under refs/sandbox/,
+       refs/wip and refs/other are user ones where permissions are
+       much wider, then you might want to set this variable as
+       follows:
++
+--------------------------------------------------------------------------------
+$feature{'extra-branch-refs'}{'default'} =
+       ['sandbox', 'wip', 'other'];
+--------------------------------------------------------------------------------
++
+If overriding was enabled then this feature can be configured on a
+per-repository basis via repository's `gitweb.extrabranchrefs`
+configuration variable, which contains a space separated list of
+refs. An example:
++
+--------------------------------------------------------------------------------
+[gitweb]
+       extrabranchrefs = sandbox wip other
+--------------------------------------------------------------------------------
++
+The gitweb.extrabranchrefs is actually a multi-valued configuration
+variable, so following example is also correct and the result is the
+same as of the snippet above:
++
+--------------------------------------------------------------------------------
+[gitweb]
+       extrabranchrefs = sandbox
+       extrabranchrefs = wip other
+--------------------------------------------------------------------------------
++
+It is an error to specify a ref that does not pass "git check-ref-format"
+scrutiny. Duplicated values are filtered.
+
 
 EXAMPLES
 --------
diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 3434602..6d3d52d 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -548,6 +548,20 @@ our %feature = (
                'sub' => sub { feature_bool('remote_heads', @_) },
                'override' => 0,
                'default' => [0]},
+
+       # Enable showing branches under other refs in addition to heads
+
+       # To set system wide extra branch refs have in $GITWEB_CONFIG
+       # $feature{'extra-branch-refs'}{'default'} = ['dirs', 'of', 'choice'];
+       # To have project specific config enable override in $GITWEB_CONFIG
+       # $feature{'extra-branch-refs'}{'override'} = 1;
+       # and in project config gitweb.extrabranchrefs = dirs of choice
+       # Every directory is separated with whitespace.
+
+       'extra-branch-refs' => {
+               'sub' => \&feature_extra_branch_refs,
+               'override' => 0,
+               'default' => []},
 );
 
 sub gitweb_get_feature {
@@ -626,6 +640,26 @@ sub feature_avatar {
        return @val ? @val : @_;
 }
 
+sub feature_extra_branch_refs {
+       my (@branch_refs) = @_;
+       my $values = git_get_project_config('extrabranchrefs');
+
+       if ($values) {
+               unless (ref $values) {
+                       $values = [$values];
+               }
+               unless (ref $values eq 'ARRAY') {
+                       return @branch_refs;
+               }
+               @branch_refs = ();
+               foreach my $value (@{$values}) {
+                       push @branch_refs, split /\s+/, $value;
+               }
+       }
+
+       return @branch_refs;
+}
+
 # checking HEAD file with -e is fragile if the repository was
 # initialized long time ago (i.e. symlink HEAD) and was pack-ref'ed
 # and then pruned.
@@ -656,6 +690,18 @@ sub filter_snapshot_fmts {
                !$known_snapshot_formats{$_}{'disabled'}} @fmts;
 }
 
+sub filter_and_validate_refs {
+       my @refs = @_;
+       my %unique_refs = ();
+
+       foreach my $ref (@refs) {
+               die_error(500, "Invalid ref '$ref' in 'extra-branch-refs' 
feature") unless (check_ref_format($ref));
+               # 'heads' are added implicitly in get_branch_refs().
+               $unique_refs{$ref} = 1 if ($ref ne 'heads');
+       }
+       return sort keys %unique_refs;
+}
+
 # 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.
@@ -1113,7 +1159,7 @@ sub evaluate_git_dir {
        our $git_dir = "$projectroot/$project" if $project;
 }
 
-our (@snapshot_fmts, $git_avatar);
+our (@snapshot_fmts, $git_avatar, @extra_branch_refs);
 sub configure_gitweb_features {
        # list of supported snapshot formats
        our @snapshot_fmts = gitweb_get_feature('snapshot');
@@ -1131,6 +1177,13 @@ sub configure_gitweb_features {
        } else {
                $git_avatar = '';
        }
+
+       our @extra_branch_refs = gitweb_get_feature('extra-branch-refs');
+       @extra_branch_refs = filter_and_validate_refs (@extra_branch_refs);
+}
+
+sub get_branch_refs {
+       return ('heads', @extra_branch_refs);
 }
 
 # custom error handler: 'die <message>' is Internal Server Error
@@ -2529,6 +2582,7 @@ sub format_snapshot_links {
 sub get_feed_info {
        my $format = shift || 'Atom';
        my %res = (action => lc($format));
+       my $matched_ref = 0;
 
        # feed links are possible only for project views
        return unless (defined $project);
@@ -2536,12 +2590,17 @@ sub get_feed_info {
        # or don't have specific feed yet (so they should use generic)
        return if (!$action || $action =~ /^(?:tags|heads|forks|tag|search)$/x);
 
-       my $branch;
-       # branches refs uses 'refs/heads/' prefix (fullname) to differentiate
-       # from tag links; this also makes possible to detect branch links
-       if ((defined $hash_base && $hash_base =~ m!^refs/heads/(.*)$!) ||
-           (defined $hash      && $hash      =~ m!^refs/heads/(.*)$!)) {
-               $branch = $1;
+       my $branch = undef;
+       # branches refs uses 'refs/' + $get_branch_refs()[x] + '/' prefix
+       # (fullname) to differentiate from tag links; this also makes
+       # possible to detect branch links
+       for my $ref (get_branch_refs()) {
+               if ((defined $hash_base && $hash_base =~ 
m!^refs/\Q$ref\E/(.*)$!) ||
+                   (defined $hash      && $hash      =~ 
m!^refs/\Q$ref\E/(.*)$!)) {
+                       $branch = $1;
+                       $matched_ref = $ref;
+                       last;
+               }
        }
        # find log type for feed description (title)
        my $type = 'log';
@@ -2554,7 +2613,7 @@ sub get_feed_info {
        }
 
        $res{-title} = $type;
-       $res{'hash'} = (defined $branch ? "refs/heads/$branch" : undef);
+       $res{'hash'} = (defined $branch ? "refs/$matched_ref/$branch" : undef);
        $res{'file_name'} = $file_name;
 
        return %res;
@@ -3209,7 +3268,7 @@ sub git_get_last_activity {
             '--format=%(committer)',
             '--sort=-committerdate',
             '--count=1',
-            'refs/heads') or return;
+            map { "refs/$_" } get_branch_refs ()) or return;
        my $most_recent = <$fd>;
        close $fd or return;
        if (defined $most_recent &&
@@ -3660,7 +3719,7 @@ sub parse_from_to_diffinfo {
 
 sub git_get_heads_list {
        my ($limit, @classes) = @_;
-       @classes = ('heads') unless @classes;
+       @classes = get_branch_refs() unless @classes;
        my @patterns = map { "refs/$_" } @classes;
        my @headslist;
 
@@ -3678,7 +3737,8 @@ sub git_get_heads_list {
                my ($committer, $epoch, $tz) =
                        ($committerinfo =~ /^(.*) ([0-9]+) (.*)$/);
                $ref_item{'fullname'}  = $name;
-               $name =~ s!^refs/(?:head|remote)s/!!;
+               my $strip_refs = join '|', map { quotemeta } get_branch_refs();
+               $name =~ s!^refs/($strip_refs|remotes)/!!;
 
                $ref_item{'name'}  = $name;
                $ref_item{'id'}    = $hash;
@@ -7195,7 +7255,8 @@ sub snapshot_name {
                $ver = $1;
        } else {
                # branches and other need shortened SHA-1 hash
-               if ($hash =~ m!^refs/(?:heads|remotes)/(.*)$!) {
+               my $strip_refs = join '|', map { quotemeta } get_branch_refs();
+               if ($hash =~ m!^refs/($strip_refs|remotes)/(.*)$!) {
                        $ver = $1;
                }
                $ver .= '-' . git_get_short_hash($project, $hash);
-- 
1.8.3.1

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