cvsimport: ignore CVSPS_NO_BRANCH and impossible branches

cvsps output often contains references to CVSPS_NO_BRANCH, commits
that it could not trace to a branch. Ignore that branch.

Additionally, cvsps will sometimes draw circular relationships
between branches -- where two branches are recorded as opening
from the other.  In those cases, and where the ancestor branch
hasn't been seen, ignore it.

Signed-off-by: Martin Langhoff <martin@catalyst.net.nz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index 76f6246..d83c52f 100755 (executable)
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -595,7 +595,11 @@ sub write_tree () {
 }
 
 my($patchset,$date,$author_name,$author_email,$branch,$ancestor,$tag,$logmsg);
-my(@old,@new,@skipped);
+my(@old,@new,@skipped,%ignorebranch);
+
+# commits that cvsps cannot place anywhere...
+$ignorebranch{'#CVSPS_NO_BRANCH'} = 1;
+
 sub commit {
        update_index(@old, @new);
        @old = @new = ();
@@ -751,7 +755,16 @@ while(<CVS>) {
                        $state = 11;
                        next;
                }
+               if (exists $ignorebranch{$branch}) {
+                       print STDERR "Skipping $branch\n";
+                       $state = 11;
+                       next;
+               }
                if($ancestor) {
+                       if($ancestor eq $branch) {
+                               print STDERR "Branch $branch erroneously stems from itself -- changed ancestor to $opt_o\n";
+                               $ancestor = $opt_o;
+                       }
                        if(-f "$git_dir/refs/heads/$branch") {
                                print STDERR "Branch $branch already exists!\n";
                                $state=11;
@@ -759,6 +772,7 @@ while(<CVS>) {
                        }
                        unless(open(H,"$git_dir/refs/heads/$ancestor")) {
                                print STDERR "Branch $ancestor does not exist!\n";
+                               $ignorebranch{$branch} = 1;
                                $state=11;
                                next;
                        }
@@ -766,6 +780,7 @@ while(<CVS>) {
                        close(H);
                        unless(open(H,"> $git_dir/refs/heads/$branch")) {
                                print STDERR "Could not create branch $branch: $!\n";
+                               $ignorebranch{$branch} = 1;
                                $state=11;
                                next;
                        }