[PATCH v6 3/5] branch: add a dry_run parameter to create_branch()

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Add a dry_run parameter to create_branch() such that dry_run = 1 will
validate a new branch without trying to create it. This will be used in
`git branch --recurse-submodules` to ensure that the new branch can be
created in all submodules.

Signed-off-by: Glen Choo <chooglen@xxxxxxxxxx>
---
 branch.c           | 5 ++++-
 branch.h           | 9 +++++----
 builtin/branch.c   | 2 +-
 builtin/checkout.c | 3 ++-
 4 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/branch.c b/branch.c
index de680f311d..55c7ba4a25 100644
--- a/branch.c
+++ b/branch.c
@@ -420,7 +420,7 @@ static void dwim_branch_start(struct repository *r, const char *start_name,
 
 void create_branch(struct repository *r, const char *name,
 		   const char *start_name, int force, int clobber_head_ok,
-		   int reflog, int quiet, enum branch_track track)
+		   int reflog, int quiet, enum branch_track track, int dry_run)
 {
 	struct object_id oid;
 	char *real_ref;
@@ -440,6 +440,8 @@ void create_branch(struct repository *r, const char *name,
 	}
 
 	dwim_branch_start(r, start_name, track, &real_ref, &oid);
+	if (dry_run)
+		goto cleanup;
 
 	if (reflog)
 		log_all_ref_updates = LOG_REFS_NORMAL;
@@ -462,6 +464,7 @@ void create_branch(struct repository *r, const char *name,
 	if (real_ref && track)
 		setup_tracking(ref.buf + 11, real_ref, track, quiet);
 
+cleanup:
 	strbuf_release(&ref);
 	free(real_ref);
 }
diff --git a/branch.h b/branch.h
index cf3a4d3ff3..8009266343 100644
--- a/branch.h
+++ b/branch.h
@@ -62,11 +62,12 @@ void dwim_and_setup_tracking(struct repository *r, const char *new_ref,
  *   - track causes the new branch to be configured to merge the remote branch
  *     that start_name is a tracking branch for (if any).
  *
+ *   - dry_run causes the branch to be validated but not created.
+ *
  */
-void create_branch(struct repository *r,
-		   const char *name, const char *start_name,
-		   int force, int clobber_head_ok,
-		   int reflog, int quiet, enum branch_track track);
+void create_branch(struct repository *r, const char *name,
+		   const char *start_name, int force, int clobber_head_ok,
+		   int reflog, int quiet, enum branch_track track, int dry_run);
 
 /*
  * Check if 'name' can be a valid name for a branch; die otherwise.
diff --git a/builtin/branch.c b/builtin/branch.c
index 16a7e80df5..9b300cf42f 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -859,7 +859,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 
 		create_branch(the_repository,
 			      argv[0], (argc == 2) ? argv[1] : head,
-			      force, 0, reflog, quiet, track);
+			      force, 0, reflog, quiet, track, 0);
 
 	} else
 		usage_with_options(builtin_branch_usage, options);
diff --git a/builtin/checkout.c b/builtin/checkout.c
index bbbfabb871..629a288dd8 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -904,7 +904,8 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 				      opts->new_branch_force ? 1 : 0,
 				      opts->new_branch_log,
 				      opts->quiet,
-				      opts->track);
+				      opts->track,
+				      0);
 		free(new_branch_info->name);
 		free(new_branch_info->refname);
 		new_branch_info->name = xstrdup(opts->new_branch);
-- 
2.33.GIT




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