[PATCH 0/2] fix "rebase -i --root" corrupting root commit

This series fixes bugs causing corruption of the root commit when "rebase -i --root" is used to swap in a new root commit. In particular, the "author" header has trailing garbage. Some tools handle the corruption somewhat gracefully by showing a bogus date, but others barf on it (gitk, for instance). git-fsck correctly identifies the corruption. I discovered this after git-rebase corrupted one of my own projects.

Unfortunately, these bugs (from js/sequencer-and-root-commits) made it into the v2.18.0 release. It's worrying that a released Git can be creating corrupt commits, but fortunately "rebase -i --root" is not likely used often (especially on well-established projects). Nevertheless, it may be 'maint' worthy and applies cleanly there.

It was only after I diagnosed and fixed these bugs that I thought to check 'pu' and discovered that Akinori MUSHA already made a stab[1] at fixing one of the three bugs which this series fixes. Akinori's fix has the somewhat undesirable property that it adds an extra blank line to the end of the script, as Phillip correctly pointed out in review[2]. Patch 2/2 of this series has the more "correct" fix, in addition to fixing another bug.

Moreover, patch 2/2 of this series provides a more thorough fix overall than Akinori, so it may make sense to replace his patch with this series, though perhaps keep the test his patch adds to augment the strict test of the "author" header added by this series.

[1]: https://public-inbox.org/git/86a7qwpt9g.knu@iDaemons.org/ [2]: https://public-inbox.org/git/f5b56540-d26a-044e-5f46-1d975f889d06@talktalk.net/

Eric Sunshine (2):
  sequencer: fix "rebase -i --root" corrupting author header
  sequencer: fix "rebase -i --root" corrupting author header timezone

 sequencer.c                   |  9 +++++++--
 t/t3404-rebase-interactive.sh | 10 +++++++++-
 2 files changed, 16 insertions(+), 3 deletions(-)