[PATCH v10 2/2] pull --rebase: add --[no-]autostash flag

[Mehul Jain <mehul.jain2029@gmail.com>]

If rebase.autoStash configuration variable is set, there is no way to
override it for "git pull --rebase" from the command line.

Teach "git pull --rebase" the --[no-]autostash command line flag which
overrides the current value of rebase.autoStash, if set. As "git rebase"
understands the --[no-]autostash option, it's just a matter of passing
the option to underlying "git rebase" when "git pull --rebase" is called.

Helped-by: Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Paul Tan <pyokagan@gmail.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com>
---
 Documentation/git-pull.txt |  9 ++++++
 builtin/pull.c             | 12 ++++++++
 t/t5520-pull.sh            | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+)

diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt
index a62a2a6..3914507 100644
--- a/Documentation/git-pull.txt
+++ b/Documentation/git-pull.txt
@@ -128,6 +128,15 @@ unless you have read linkgit:git-rebase[1] carefully.
 --no-rebase::
 	Override earlier --rebase.
 
+--autostash::
+--no-autostash::
+	Before starting rebase, stash local modifications away (see
+	linkgit:git-stash[1]) if needed, and apply the stash when
+	done. `--no-autostash` is useful to override the `rebase.autoStash`
+	configuration variable (see linkgit:git-config[1]).
++
+This option is only valid when "--rebase" is used.
+
 Options related to fetching
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/builtin/pull.c b/builtin/pull.c
index c21897d..d98f481 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -86,6 +86,7 @@ static char *opt_commit;
 static char *opt_edit;
 static char *opt_ff;
 static char *opt_verify_signatures;
+static int opt_autostash = -1;
 static int config_autostash;
 static struct argv_array opt_strategies = ARGV_ARRAY_INIT;
 static struct argv_array opt_strategy_opts = ARGV_ARRAY_INIT;
@@ -150,6 +151,8 @@ static struct option pull_options[] = {
 	OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures, NULL,
 		N_("verify that the named commit has a valid GPG signature"),
 		PARSE_OPT_NOARG),
+	OPT_BOOL(0, "autostash", &opt_autostash,
+		N_("automatically stash/stash pop before and after rebase")),
 	OPT_PASSTHRU_ARGV('s', "strategy", &opt_strategies, N_("strategy"),
 		N_("merge strategy to use"),
 		0),
@@ -802,6 +805,10 @@ static int run_rebase(const unsigned char *curr_head,
 	argv_array_pushv(&args, opt_strategy_opts.argv);
 	if (opt_gpg_sign)
 		argv_array_push(&args, opt_gpg_sign);
+	if (opt_autostash == 0)
+		argv_array_push(&args, "--no-autostash");
+	else if (opt_autostash == 1)
+		argv_array_push(&args, "--autostash");
 
 	argv_array_push(&args, "--onto");
 	argv_array_push(&args, sha1_to_hex(merge_head));
@@ -847,8 +854,13 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	if (get_sha1("HEAD", orig_head))
 		hashclr(orig_head);
 
+	if (!opt_rebase && opt_autostash != -1)
+		die(_("--[no-]autostash option is only valid with --rebase."));
+
 	if (opt_rebase) {
 		int autostash = config_autostash;
+		if (opt_autostash != -1)
+			autostash = opt_autostash;
 
 		if (is_null_sha1(orig_head) && !is_cache_unborn())
 			die(_("Updating an unborn branch with changes added to the index."));
diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
index c952d5e..745e59e 100755
--- a/t/t5520-pull.sh
+++ b/t/t5520-pull.sh
@@ -256,6 +256,76 @@ test_expect_success 'pull --rebase succeeds with dirty working directory and reb
 	test "$(cat file)" = "modified again"
 '
 
+test_expect_success 'pull --rebase --autostash & rebase.autostash=true' '
+	test_config rebase.autostash true &&
+	git reset --hard before-rebase &&
+	echo dirty >new_file &&
+	git add new_file &&
+	git pull --rebase --autostash . copy &&
+	test_cmp_rev HEAD^ copy &&
+	test "$(cat new_file)" = dirty &&
+	test "$(cat file)" = "modified again"
+'
+
+test_expect_success 'pull --rebase --autostash & rebase.autoStash=false' '
+	test_config rebase.autostash false &&
+	git reset --hard before-rebase &&
+	echo dirty >new_file &&
+	git add new_file &&
+	git pull --rebase --autostash . copy &&
+	test_cmp_rev HEAD^ copy &&
+	test "$(cat new_file)" = dirty &&
+	test "$(cat file)" = "modified again"
+'
+
+test_expect_success 'pull --rebase: --autostash & rebase.autoStash unset' '
+	git reset --hard before-rebase &&
+	echo dirty >new_file &&
+	git add new_file &&
+	git pull --rebase --autostash . copy &&
+	test_cmp_rev HEAD^ copy &&
+	test "$(cat new_file)" = dirty &&
+	test "$(cat file)" = "modified again"
+'
+
+test_expect_success 'pull --rebase --no-autostash & rebase.autostash=true' '
+	test_config rebase.autostash true &&
+	git reset --hard before-rebase &&
+	echo dirty >new_file &&
+	git add new_file &&
+	test_must_fail git pull --rebase --no-autostash . copy 2>err &&
+	test_i18ngrep "Cannot pull with rebase: Your index contains uncommitted changes." err
+'
+
+test_expect_success 'pull --rebase --no-autostash & rebase.autostash=false' '
+	test_config rebase.autostash false &&
+	git reset --hard before-rebase &&
+	echo dirty >new_file &&
+	git add new_file &&
+	test_must_fail git pull --rebase --no-autostash . copy 2>err &&
+	test_i18ngrep "Cannot pull with rebase: Your index contains uncommitted changes." err
+'
+
+test_expect_success 'pull --rebase --no-autostash & rebase.autostash unset' '
+	git reset --hard before-rebase &&
+	echo dirty >new_file &&
+	git add new_file &&
+	test_must_fail git pull --rebase --no-autostash . copy 2>err &&
+	test_i18ngrep "Cannot pull with rebase: Your index contains uncommitted changes." err
+'
+
+test_expect_success 'pull --autostash (without --rebase) should error out' '
+	test_must_fail git pull --autostash . copy 2>actual &&
+	echo "fatal: --[no-]autostash option is only valid with --rebase." >expect &&
+	test_i18ncmp actual expect
+'
+
+test_expect_success 'pull --no-autostash (without --rebase) should error out' '
+	test_must_fail git pull --no-autostash . copy 2>actual &&
+	echo "fatal: --[no-]autostash option is only valid with --rebase." >expect &&
+	test_i18ncmp actual expect
+'
+
 test_expect_success 'pull.rebase' '
 	git reset --hard before-rebase &&
 	test_config pull.rebase true &&
-- 
2.7.1.340.g69eb491.dirty