cvsimport: use git-update-index --index-info

This should reduce the number of git-update-index forks required per
commit. We now do adds/removes in one call, and we are no longer forced to
deal with argv limitations.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index 712cdc0..90ca018 100755 (executable)
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -565,29 +565,19 @@ my($patchset,$date,$author_name,$author_email,$branch,$ancestor,$tag,$logmsg);
 my(@old,@new,@skipped);
 sub commit {
        my $pid;
-       while(@old) {
-               my @o2;
-               if(@old > 55) {
-                       @o2 = splice(@old,0,50);
-               } else {
-                       @o2 = @old;
-                       @old = ();
-               }
-               system("git-update-index","--force-remove","--",@o2);
-               die "Cannot remove files: $?\n" if $?;
-       }
-       while(@new) {
-               my @n2;
-               if(@new > 12) {
-                       @n2 = splice(@new,0,10);
-               } else {
-                       @n2 = @new;
-                       @new = ();
-               }
-               system("git-update-index","--add",
-                       (map { ('--cacheinfo', @$_) } @n2));
-               die "Cannot add files: $?\n" if $?;
-       }
+
+       open(my $fh, '|-', qw(git-update-index -z --index-info))
+               or die "unable to open git-update-index: $!";
+       print $fh
+               (map { "0 0000000000000000000000000000000000000000\t$_\0" }
+                       @old),
+               (map { '100' . sprintf('%o', $_->[0]) . " $_->[1]\t$_->[2]\0" }
+                       @new)
+               or die "unable to write to git-update-index: $!";
+       close $fh
+               or die "unable to write to git-update-index: $!";
+       $? and die "git-update-index reported error: $?";
+       @old = @new = ();
 
        $pid = open(C,"-|");
        die "Cannot fork: $!" unless defined $pid;