[PATCH v2 1/2] pull --rebase: add --[no-]autostash flag

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

git pull --rebase understands --[no-]autostash flag.

This flag overrides config variable "rebase.autoStash" 
if set (default is false).

When calling "git pull --rebase" with "--autostash",
pull passes the "--autostash" option to rebase, 
which then runs rebase on a dirty worktree.

With "--no-autostash" option, the command will die
if the worktree is dirty, before calling rebase.

Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com>
---

Thanks to Paul and Matthieu for comments on previous round.
Changes:
 	- --autostash flag added
	- OPT_COLOR_FLAG replaced by OPT_BOOL
	- Default value of opt_rebase changed
	- Few changes in code
	- Commit message improvements
	- Documentation added
	- Few tests removed as suggested by Paul
	- Added test for --autostash flag
All tests passed: https://travis-ci.org/mehul2029/git 

 builtin/pull.c          | 13 ++++++++-----
 t/t5520-pull.sh         | 19 +++++++++++++++++++
 t/t5521-pull-options.sh | 16 ++++++++++++++++
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/builtin/pull.c b/builtin/pull.c
index 10eff03..60b320e 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -85,6 +85,7 @@ static char *opt_squash;
 static char *opt_commit;
 static char *opt_edit;
 static char *opt_ff;
+static int opt_autostash = 0;
 static char *opt_verify_signatures;
 static struct argv_array opt_strategies = ARGV_ARRAY_INIT;
 static struct argv_array opt_strategy_opts = ARGV_ARRAY_INIT;
@@ -146,6 +147,8 @@ static struct option pull_options[] = {
 	OPT_PASSTHRU(0, "ff-only", &opt_ff, NULL,
 		N_("abort if fast-forward is not possible"),
 		PARSE_OPT_NOARG | PARSE_OPT_NONEG),
+	OPT_BOOL(0,"autostash",&opt_autostash,
+		N_("automatically stash/stash pop before and after rebase")),
 	OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures, NULL,
 		N_("verify that the named commit has a valid GPG signature"),
 		PARSE_OPT_NOARG),
@@ -789,7 +792,8 @@ 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)
+		argv_array_push(&args,"--autostash");
 	argv_array_push(&args, "--onto");
 	argv_array_push(&args, sha1_to_hex(merge_head));
 
@@ -813,6 +817,8 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	if (!getenv("GIT_REFLOG_ACTION"))
 		set_reflog_message(argc, argv);
 
+	git_config_get_bool("rebase.autostash",&opt_autostash);
+
 	argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0);
 
 	parse_repo_refspecs(argc, argv, &repo, &refspecs);
@@ -835,13 +841,10 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 		hashclr(orig_head);
 
 	if (opt_rebase) {
-		int autostash = 0;
-
 		if (is_null_sha1(orig_head) && !is_cache_unborn())
 			die(_("Updating an unborn branch with changes added to the index."));
 
-		git_config_get_bool("rebase.autostash", &autostash);
-		if (!autostash)
+		if (!opt_autostash)
 			die_on_unclean_work_tree(prefix);
 
 		if (get_rebase_fork_point(rebase_fork_point, repo, *refspecs))
diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
index c952d5e..d80b6cc 100755
--- a/t/t5520-pull.sh
+++ b/t/t5520-pull.sh
@@ -245,6 +245,25 @@ test_expect_success '--rebase fails with multiple branches' '
 	test modified = "$(git show HEAD:file)"
 '
 
+test_expect_success 'pull --rebase --no-autostash fails with dirty working directory and rebase.autstash set false' '
+	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
+'
+
+test_expect_success 'pull --rebase --autostash succeeds with dirty working directory and rebase.autstash set 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 succeeds with dirty working directory and rebase.autostash set' '
 	test_config rebase.autostash true &&
 	git reset --hard before-rebase &&
diff --git a/t/t5521-pull-options.sh b/t/t5521-pull-options.sh
index 18372ca..3930e45 100755
--- a/t/t5521-pull-options.sh
+++ b/t/t5521-pull-options.sh
@@ -62,6 +62,22 @@ test_expect_success 'git pull -v --rebase' '
 	test_must_be_empty out)
 '
 
+test_expect_success 'git pull --rebase --autostash' '
+	mkdir clonedrbas &&
+	(cd clonedrbas  && git init &&
+	git pull --rebase --autostash "../parent" >out 2>err &&
+	test -s err &&
+	test_must_be_empty out)
+'
+
+test_expect_success 'git pull --rebase --no-autostash' '
+	mkdir clonedrbnas &&
+	(cd clonedrbnas  && git init &&
+	git pull --rebase --no-autostash "../parent" >out 2>err &&
+	test -s err &&
+	test_must_be_empty out)
+'
+
 test_expect_success 'git pull -v -q' '
 	mkdir clonedvq &&
 	(cd clonedvq && git init &&
-- 
2.7.1.340.g69eb491.dirty