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am: handle stray $dotest directory

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The following bug has been observed:

  $ git am  # no input file
  ^C
  $ git am --abort
  Resolve operation not in progress, we are not resuming.

This happens because the following test fails:

  test -d "$dotest" && test -f "$dotest/last" && test -f "$dotest/next"

and the codepath for an "am in-progress" is not executed.  It falls back
to the codepath that treats this as a "fresh execution".  Before
rr/rebase-autostash, this condition was

  test -d "$dotest"

It would incorrectly execute the "normal" am --abort codepath:

  git read-tree --reset -u HEAD ORIG_HEAD
  git reset ORIG_HEAD

by incorrectly assuming that an am is "in progress" (i.e. ORIG_HEAD
etc. was written during the previous execution).

Notice that

  $ git am
  ^C

executes nothing of significance, is equivalent to

  $ mkdir .git/rebase-apply

Therefore, the correct solution is to treat .git/rebase-apply as a
"stray directory" and remove it on --abort in the fresh-execution
codepath.  Also ensure that we're not called with --rebasing from
git-rebase--am.sh; in that case, it is the responsibility of the caller
to handle and stray directories.

While at it, tell the user to run "git am --abort" to get rid of the
stray $dotest directory, if she attempts anything else.

Reported-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ramkumar Ramachandra 2013-06-15 18:13:11 +05:30 committed by Junio C Hamano
parent 587947750b
commit b141f3c9d3
2 changed files with 23 additions and 0 deletions
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17
git-am.sh
View file

@ -506,6 +506,23 @@ then
esac
rm -f "$dotest/dirtyindex"
else
# Possible stray $dotest directory in the independent-run
# case; in the --rebasing case, it is upto the caller
# (git-rebase--am) to take care of stray directories.
if test -d "$dotest" && test -z "$rebasing"
then
case "$skip,$resolved,$abort" in
,,t)
rm -fr "$dotest"
exit 0
;;
*)
die "$(eval_gettext "Stray \$dotest directory found.
Use \"git am --abort\" to remove it.")"
;;
esac
fi
# Make sure we are not given --skip, --resolved, nor --abort
test "$skip$resolved$abort" = "" ||
die "$(gettext "Resolve operation not in progress, we are not resuming.")"

6
t/t4150-am.sh
View file

@ -363,6 +363,12 @@ test_expect_success 'am --skip works' '
test_cmp expected another
'
test_expect_success 'am --abort removes a stray directory' '
mkdir .git/rebase-apply &&
git am --abort &&
test_path_is_missing .git/rebase-apply
'
test_expect_success 'am --resolved works' '
echo goodbye >expected &&
rm -fr .git/rebase-apply &&