make it experimental

[dgit.git] / dgit

diff --git a/dgit b/dgit
index 12f7510033cbede7ee554e3106553da7636e2967..a18f45cad6cf2235c2d8e7befc8fc523d40bf400 100755 (executable)
--- a/dgit
+++ b/dgit
@@ -1,4 +1,22 @@
 #!/usr/bin/perl -w
+# dgit
+# Integration between git and Debian-style archives
+#
+# Copyright (C)2013 Ian Jackson
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 use strict;
 
 use IO::Handle;
@@ -216,6 +234,16 @@ END
 
 my $lastupl_ref = "refs/remotes/$remotename/upload/$suite";
 
+sub rev_parse ($) {
+    return cmdoutput qw(git rev-parse --), "$_[0]~0";
+}
+
+sub is_fast_fwd ($$) {
+    my ($ancestor,$child) = @_;
+    my $mb = cmdoutput qw(git merge-base), $dsc_hash, $lastupl_hash;
+    return rev_parse($mb) eq rev_parse($ancestor);
+}
+
 sub fetch_from_archive () {
     # ensures that $lastupl_ref is what is actually in the archive,
     #  one way or another
@@ -230,10 +258,9 @@ sub fetch_from_archive () {
        $hash = generate_commit_from_dsc();
     }
     if ($lastupl_hash) {
-       my $mb = cmdoutput qw(git merge-base), $dsc_hash, $lastupl_hash;
        die "not fast forward on last upload branch!".
            " (archive's version left in DGIT_ARCHIVE)"
-           unless $mb eq $lastupl_hash;
+           unless is_fast_fwd($lastupl_hash, $dsc_hash);
     }
     if ($lastupl_ref ne $hash) {
        cmdoutput qw(git update-ref -m), 'dgit fetch', $lastupl_ref, $hash;
@@ -297,8 +324,11 @@ sub push () {
     runcmd qw(git fetch), $alioth_git,
         map { "$_:refs/remotes/$remotename/$_" }
         (mainbranch(), uploadbranch());
-    
     die <<END;
+    if (!is_fast_fwd(mainbranch
+xxx introduce remote_lref
+xxx use remote_lref everywhere
+
 fetch from alioth
 do fast forward check and maybe fake merge
 push to uploading