+=head2 lock_read_all_merged_bugs
+
+ my ($locks,@bug_data) = lock_read_all_merged_bugs($bug_num,$location);
+
+Performs a filelock, then reads the bug passed. If the bug is merged,
+locks the merge lock, then reads and locks all of the other merged
+bugs. Returns a list of the number of locks and the bug data for all
+of the merged bugs.
+
+Will also return undef if any of the merged bugs failed to be read,
+even if all of the others were read properly.
+
+=cut
+
+sub lock_read_all_merged_bugs {
+ my ($bug_num,$location) = @_;
+ my @data = (lockreadbug(@_));
+ if (not @data and not defined $data[0]) {
+ return (0,undef);
+ }
+ if (not length $data[0]->{mergedwith}) {
+ return (1,@data);
+ }
+ unfilelock();
+ filelock("$config{spool_dir}/lock/merge");
+ my $locks = 0;
+ @data = (lockreadbug(@_));
+ if (not @data and not defined $data[0]) {
+ unfilelock(); #for merge lock above
+ return (0,undef);
+ }
+ $locks++;
+ my @bugs = split / /, $data[0]->{mergedwith};
+ for my $bug (@bugs) {
+ my $newdata = undef;
+ if ($bug ne $bug_num) {
+ $newdata = lockreadbug($bug,$location);
+ if (not defined $newdata) {
+ for (1..$locks) {
+ unfilelock();
+ }
+ $locks = 0;
+ warn "Unable to read bug: $bug while handling merged bug: $bug_num";
+ return ($locks,undef);
+ }
+ $locks++;
+ push @data,$newdata;
+ }
+ # perform a sanity check to make sure that the merged bugs are
+ # all merged with eachother
+ my $expectmerge= join(' ',grep($_ != $bug, sort { $a <=> $b } @bugs));
+ if ($newdata->{mergedwith} ne $expectmerge) {
+ for (1..$locks) {
+ unfilelock();
+ }
+ die "Bug $bug_num differs from bug $bug: ($newdata->{mergedwith}) vs. ($expectmerge) (".join(' ',@bugs).")";
+ }
+ }
+ return (2,@data);
+}
+