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[PATCH 0/4] fix BUG() with "git am -i --resolved"

On Mon, May 20, 2019 at 06:02:11AM -0400, Jeff King wrote:

> I haven't tried to reproduce yet. Is the repository (and patch) that you
> used to demonstrate this publicly available? Or alternatively, is it
> possible to show a backtrace from the coredump?

Never mind. It reproduces quite easily, because AFAICT "am -i
--resolved" has been totally broken since it was converted to C (in
2015!). I guess it does not have many users. :)

> If my blind guess is right, then something like this probably fixes it:

This is indeed the problem. Here are some patches. The actual fix is
what I showed already. The other three are just making it possible to
cover this with the test suite (until now, we had no coverage of "am
--interactive" at all).

  [1/4]: am: simplify prompt response handling
  [2/4]: am: read interactive input from stdin
  [3/4]: am: drop tty requirement for --interactive
  [4/4]: am: fix --interactive HEAD tree resolution

 builtin/am.c              | 30 +++++++++++++++---------
 t/t4257-am-interactive.sh | 49 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 11 deletions(-)
 create mode 100755 t/t4257-am-interactive.sh