Merge branch 'pw/rebase-i-merge-segv-fix'

"git rebase -i", when a 'merge <branch>' insn in its todo list
fails, segfaulted, which has been (minimally) corrected.

* pw/rebase-i-merge-segv-fix:
  rebase -i: fix SIGSEGV when 'merge <branch>' fails
  t3430: add conflicting commit

1 files changed, 19 insertions, 5 deletions

diff --git a/sequencer.c b/sequencer.c
index 2db52fe800..65d371c746 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2610,8 +2610,13 @@ static int error_with_patch(struct commit *commit,
 	const char *subject, int subject_len,
 	struct replay_opts *opts, int exit_code, int to_amend)
 {
-	if (make_patch(commit, opts))
-		return -1;
+	if (commit) {
+		if (make_patch(commit, opts))
+			return -1;
+	} else if (copy_file(rebase_path_message(),
+			     git_path_merge_msg(the_repository), 0666))
+		return error(_("unable to copy '%s' to '%s'"),
+			     git_path_merge_msg(the_repository), rebase_path_message());
 
 	if (to_amend) {
 		if (intend_to_amend())
@@ -2626,9 +2631,18 @@ static int error_with_patch(struct commit *commit,
 			  "\n"
 			  "  git rebase --continue\n"),
 			gpg_sign_opt_quoted(opts));
-	} else if (exit_code)
-		fprintf_ln(stderr, _("Could not apply %s... %.*s"),
-			short_commit_name(commit), subject_len, subject);
+	} else if (exit_code) {
+		if (commit)
+			fprintf_ln(stderr, _("Could not apply %s... %.*s"),
+				   short_commit_name(commit), subject_len, subject);
+		else
+			/*
+			 * We don't have the hash of the parent so
+			 * just print the line from the todo file.
+			 */
+			fprintf_ln(stderr, _("Could not merge %.*s"),
+				   subject_len, subject);
+	}
 
 	return exit_code;
 }