X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=Debian%2FDgit.pm;h=e2f8edd05848c76f74e13c65d6561e39df1d1e48;hp=211bae3a6626d503b6452864aa5815769ba1c6e9;hb=996984bbcc5c1c7b4ed734fdb7a3dd844f2ff567;hpb=e1adbc736603409551756653090e4455562833af

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index 211bae3a..e2f8edd0 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -12,6 +12,7 @@ BEGIN {
     $VERSION     = 1.00;
     @ISA         = qw(Exporter);
     @EXPORT      = qw(debiantag server_branch server_ref
+                      stat_exists git_for_each_ref
                       $package_re $branchprefix);
     %EXPORT_TAGS = ( policyflags => qw() );
     @EXPORT_OK   = qw();
@@ -43,4 +44,35 @@ sub debiantag ($) {
 sub server_branch ($) { return "$branchprefix/$_[0]"; }
 sub server_ref ($) { return "refs/".server_branch($_[0]); }
 
+sub stat_exists ($) {
+    my ($f) = @_;
+    return 1 if stat $f;
+    return 0 if $!==&ENOENT;
+    die "stat $f: $!";
+}
+
+sub git_for_each_ref ($$) {
+    my ($pattern,$func) = @_;
+    # calls $func->($objid,$objtype,$fullrefname,$reftail);
+    # $reftail is RHS of ref after refs/\w+/
+    # breaks if $pattern matches any ref `refs/blah' where blah has no `/'
+    my $fh = new IO::File, "-|", qw(git for-each-ref), $pattern or die $!;
+    while (<$fh>) {
+	m#^(\w+)\s+(\w+)\s+(refs/\w+/(\S+))\s# or die "$_ ?";
+	$func->($1,$2,$3,$4);
+    }
+    $!=0; $?=0; close $fh or die "$pattern $? $!";
+}
+
+sub git_for_each_tag_referring ($$) {
+    my ($objreferring, $func) = @_;
+    # calls $func->($objid,$fullrefname,$tagname);
+    git_for_each_ref('refs/tags', sub {
+	my ($objid,$objtype,$fullrefname,$tagname) = @_;
+	next unless $objtype eq 'tag';
+	next if defined $objreferring and $objid ne $objreferring;
+	$func->($objid,$fullrefname,$tagname);
+    });
+}
+
 1;