TODO
- more tests, see "todo" in gdr-editw
reference docs
git-debrebase(5) data model
git-debrebase(1) command line
[git-debrebase breakwater: declare upstream]
[git-debrebase pseudomerge: stitch]
+[git-debrebase convert-to-gbp: commit patches]
+
m{^\[git-debrebase (?:\w*-)?upstream combine \.((?: $extra_orig_namepart_re)+)\]}
Every breakwater commit must be a merge. In principle, this is not