[PATCH 06/14] pull: support pull.ff config

[Paul Tan <pyokagan@gmail.com>]

Since b814da8 (pull: add pull.ff configuration, 2014-01-15), git-pull.sh
would lookup the configuration value of "pull.ff", and set the flag
"--ff" if its value is "true", "--no-ff" if its value is "false" and
"--ff-only" if its value is "only".

Re-implement this behavior.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/pull.c               | 25 +++++++++++++++++++++++++
 t/t7601-merge-pull-config.sh |  4 ++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/builtin/pull.c b/builtin/pull.c
index 8982fdf..b305a47 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -209,6 +209,28 @@ static void argv_push_force(struct argv_array *arr)
 		argv_array_push(arr, "-f");
 }
 
+/**
+ * If pull.ff is "true", returns "--ff". If pull.ff is "false", returns
+ * "--no-ff". If pull.ff is "only", returns "--ff-only". Otherwise, returns
+ * NULL.
+ */
+static const char *config_get_ff(void)
+{
+	const char *value;
+
+	if (git_config_get_value("pull.ff", &value))
+		return NULL;
+	switch (git_config_maybe_bool("pull.ff", value)) {
+		case 0:
+			return "--no-ff";
+		case 1:
+			return "--ff";
+	}
+	if (!strcmp("pull.ff", "only"))
+		return "--ff-only";
+	die(_("Invalid value for pull.ff: %s"), value);
+}
+
 struct known_remote {
 	struct known_remote *next;
 	struct remote *remote;
@@ -449,6 +471,9 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0);
 	parse_repo_refspecs(argc, argv, &repo, &refspecs);
 
+	if (!opt_ff)
+		opt_ff = xstrdup_or_null(config_get_ff());
+
 	if (run_fetch(repo, refspecs))
 		return 1;
 
diff --git a/t/t7601-merge-pull-config.sh b/t/t7601-merge-pull-config.sh
index 7a846a2..f768c90 100755
--- a/t/t7601-merge-pull-config.sh
+++ b/t/t7601-merge-pull-config.sh
@@ -45,7 +45,7 @@ test_expect_success 'fast-forward pull succeeds with "true" in pull.ff' '
 	test "$(git rev-parse HEAD)" = "$(git rev-parse c1)"
 '
 
-test_expect_failure 'fast-forward pull creates merge with "false" in pull.ff' '
+test_expect_success 'fast-forward pull creates merge with "false" in pull.ff' '
 	git reset --hard c0 &&
 	test_config pull.ff false &&
 	git pull . c1 &&
@@ -53,7 +53,7 @@ test_expect_failure 'fast-forward pull creates merge with "false" in pull.ff' '
 	test "$(git rev-parse HEAD^2)" = "$(git rev-parse c1)"
 '
 
-test_expect_failure 'pull prevents non-fast-forward with "only" in pull.ff' '
+test_expect_success 'pull prevents non-fast-forward with "only" in pull.ff' '
 	git reset --hard c1 &&
 	test_config pull.ff only &&
 	test_must_fail git pull . c3
-- 
2.1.4