[PATCH v4 16/19] pull: configure --rebase via branch.<name>.rebase or pull.rebase

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Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28),
fetch+rebase could be set by default by defining the config variable
branch.<name>.rebase. This setting can be overriden on the command line
by --rebase and --no-rebase.

Since 6b37dff (pull: introduce a pull.rebase option to enable --rebase,
2011-11-06), git-pull --rebase can also be configured via the
pull.rebase configuration option.

Re-implement support for these two configuration settings by introducing
config_get_rebase() which is called before parse_options() to set the
default value of opt_rebase.

Helped-by: Stefan Beller <sbeller@xxxxxxxxxx>
Helped-by: Duy Nguyen <pclouds@xxxxxxxxx>
Signed-off-by: Paul Tan <pyokagan@xxxxxxxxx>
---

Notes:
    v4
    
    * Fixed the use-after-free. Thanks Duy for catching it.

 builtin/pull.c | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/builtin/pull.c b/builtin/pull.c
index 33a7b98..1c4fb44 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -72,7 +72,7 @@ static int opt_verbosity;
 static char *opt_progress;
 
 /* Options passed to git-merge or git-rebase */
-static enum rebase_type opt_rebase;
+static enum rebase_type opt_rebase = -1;
 static char *opt_diffstat;
 static char *opt_log;
 static char *opt_squash;
@@ -266,6 +266,36 @@ static const char *config_get_ff(void)
 }
 
 /**
+ * Returns the default configured value for --rebase. It first looks for the
+ * value of "branch.$curr_branch.rebase", where $curr_branch is the current
+ * branch, and if HEAD is detached or the configuration key does not exist,
+ * looks for the value of "pull.rebase". If both configuration keys do not
+ * exist, returns REBASE_FALSE.
+ */
+static enum rebase_type config_get_rebase(void)
+{
+	struct branch *curr_branch = branch_get("HEAD");
+	const char *value;
+
+	if (curr_branch) {
+		char *key = xstrfmt("branch.%s.rebase", curr_branch->name);
+
+		if (!git_config_get_value(key, &value)) {
+			enum rebase_type ret = parse_config_rebase(key, value, 1);
+			free(key);
+			return ret;
+		}
+
+		free(key);
+	}
+
+	if (!git_config_get_value("pull.rebase", &value))
+		return parse_config_rebase("pull.rebase", value, 1);
+
+	return REBASE_FALSE;
+}
+
+/**
  * Appends merge candidates from FETCH_HEAD that are not marked not-for-merge
  * into merge_heads.
  */
@@ -707,6 +737,9 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	if (!opt_ff)
 		opt_ff = xstrdup_or_null(config_get_ff());
 
+	if (opt_rebase < 0)
+		opt_rebase = config_get_rebase();
+
 	git_config(git_default_config, NULL);
 
 	if (read_cache_unmerged())
-- 
2.1.4

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