[PATCH v4 5/9] rebase: add coverage of other incompatible options

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

The git-rebase manual noted several sets of incompatible options, but
we were missing tests for a few of these.  Further, we were missing
code checks for some of these, which could result in command line
options being silently ignored.

Also, note that adding a check for autosquash means that using
--whitespace=fix together with the config setting rebase.autosquash=true
will trigger an error.  A subsequent commit will improve the error
message.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 Documentation/git-rebase.txt           |  2 +-
 builtin/rebase.c                       | 30 ++++++++++++++++++++------
 t/t3422-rebase-incompatible-options.sh | 25 +++++++++++++++++++++
 3 files changed, 49 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index 846aeed1b69..8cb075b2bdb 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -650,7 +650,7 @@ are incompatible with the following options:
  * --exec
  * --no-keep-empty
  * --empty=
- * --reapply-cherry-picks
+ * --[no-]reapply-cherry-picks
  * --edit-todo
  * --update-refs
  * --root when used without --onto
diff --git a/builtin/rebase.c b/builtin/rebase.c
index b742cc8fb5c..ed7475804cb 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1224,6 +1224,26 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		if (options.fork_point < 0)
 			options.fork_point = 0;
 	}
+	/*
+	 * The apply backend does not support --[no-]reapply-cherry-picks.
+	 * The behavior it implements by default is equivalent to
+	 * --no-reapply-cherry-picks (due to passing --cherry-picks to
+	 * format-patch), but --keep-base alters the upstream such that no
+	 * cherry-picks can be found (effectively making it act like
+	 * --reapply-cherry-picks).
+	 *
+	 * Now, if the user does specify --[no-]reapply-cherry-picks, but
+	 * does so in such a way that options.reapply_cherry_picks ==
+	 * keep_base, then the behavior they get will match what they
+	 * expect despite options.reapply_cherry_picks being ignored.  We
+	 * could just allow the flag in that case, but it seems better to
+	 * just alert the user that they've specified a flag that the
+	 * backend ignores.
+	 */
+	if (options.reapply_cherry_picks >= 0)
+		imply_merge(&options, options.reapply_cherry_picks ? "--reapply-cherry-picks" :
+								     "--no-reapply-cherry-picks");
+
 	/*
 	 * --keep-base defaults to --reapply-cherry-picks to avoid losing
 	 * commits when using this option.
@@ -1406,13 +1426,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	if (options.empty != EMPTY_UNSPECIFIED)
 		imply_merge(&options, "--empty");
 
-	/*
-	 * --keep-base implements --reapply-cherry-picks by altering upstream so
-	 * it works with both backends.
-	 */
-	if (options.reapply_cherry_picks && !keep_base)
-		imply_merge(&options, "--reapply-cherry-picks");
-
 	if (gpg_sign)
 		options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
 
@@ -1503,6 +1516,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	if (options.update_refs)
 		imply_merge(&options, "--update-refs");
 
+	if (options.autosquash)
+		imply_merge(&options, "--autosquash");
+
 	if (options.type == REBASE_UNSPECIFIED) {
 		if (!strcmp(options.default_backend, "merge"))
 			imply_merge(&options, "--merge");
diff --git a/t/t3422-rebase-incompatible-options.sh b/t/t3422-rebase-incompatible-options.sh
index f86274990b0..6a17b571ec7 100755
--- a/t/t3422-rebase-incompatible-options.sh
+++ b/t/t3422-rebase-incompatible-options.sh
@@ -50,6 +50,11 @@ test_rebase_am_only () {
 		test_must_fail git rebase $opt --strategy-option=ours A
 	"
 
+	test_expect_success "$opt incompatible with --autosquash" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --autosquash A
+	"
+
 	test_expect_success "$opt incompatible with --interactive" "
 		git checkout B^0 &&
 		test_must_fail git rebase $opt --interactive A
@@ -60,6 +65,26 @@ test_rebase_am_only () {
 		test_must_fail git rebase $opt --exec 'true' A
 	"
 
+	test_expect_success "$opt incompatible with --keep-empty" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --keep-empty A
+	"
+
+	test_expect_success "$opt incompatible with --empty=..." "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --empty=ask A
+	"
+
+	test_expect_success "$opt incompatible with --no-reapply-cherry-picks" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --no-reapply-cherry-picks A
+	"
+
+	test_expect_success "$opt incompatible with --reapply-cherry-picks" "
+		git checkout B^0 &&
+		test_must_fail git rebase $opt --reapply-cherry-picks A
+	"
+
 	test_expect_success "$opt incompatible with --update-refs" "
 		git checkout B^0 &&
 		test_must_fail git rebase $opt --update-refs A
-- 
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