[PATCH v2 1/2] builtin/clone.c: add --no-shallow option

["lilinchao via GitGitGadget" <gitgitgadget@gmail.com>]

From: lilinchao <lilinchao@oschina.cn>

This patch add a new option that reject to clone a shallow repository.
Clients don't know it's a shallow repository until they download it
locally, in some scenariors, clients just don't want to clone this kind
of repository, and want to exit the process immediately without creating
any unnecessary files.

Signed-off-by: lilinchao <lilinchao@oschina.cn>
---
 Documentation/config/clone.txt |  3 +++
 Documentation/git-clone.txt    |  8 +++++++-
 builtin/clone.c                | 13 +++++++++++++
 t/t5606-clone-options.sh       |  7 +++++++
 t/t5611-clone-config.sh        |  7 +++++++
 5 files changed, 37 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 builtin/clone.c

diff --git a/Documentation/config/clone.txt b/Documentation/config/clone.txt
index 47de36a5fedf..29b779b8a825 100644
--- a/Documentation/config/clone.txt
+++ b/Documentation/config/clone.txt
@@ -2,3 +2,6 @@ clone.defaultRemoteName::
 	The name of the remote to create when cloning a repository.  Defaults to
 	`origin`, and can be overridden by passing the `--origin` command-line
 	option to linkgit:git-clone[1].
+
+clone.rejectshallow::
+	Reject to clone a repository if it is a shallow one.
diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 02d9c19cec75..9ce6e545577f 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -15,7 +15,7 @@ SYNOPSIS
 	  [--dissociate] [--separate-git-dir <git dir>]
 	  [--depth <depth>] [--[no-]single-branch] [--no-tags]
 	  [--recurse-submodules[=<pathspec>]] [--[no-]shallow-submodules]
-	  [--[no-]remote-submodules] [--jobs <n>] [--sparse]
+	  [--[no-]remote-submodules] [--jobs <n>] [--sparse] [--no-shallow]
 	  [--filter=<filter>] [--] <repository>
 	  [<directory>]
 
@@ -149,6 +149,12 @@ objects from the source repository into a pack in the cloned repository.
 --no-checkout::
 	No checkout of HEAD is performed after the clone is complete.
 
+--no-shallow::
+	Don't clone a shallow source repository. In some scenariors, clients
+	want the cloned repository information to be complete. Otherwise,
+	the cloning process should end immediately without creating any files,
+	which can save some disk space.
+
 --bare::
 	Make a 'bare' Git repository.  That is, instead of
 	creating `<directory>` and placing the administrative
diff --git a/builtin/clone.c b/builtin/clone.c
old mode 100644
new mode 100755
index e335734b4cfd..b07d867e6641
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -50,6 +50,7 @@ static int option_no_checkout, option_bare, option_mirror, option_single_branch
 static int option_local = -1, option_no_hardlinks, option_shared;
 static int option_no_tags;
 static int option_shallow_submodules;
+static int option_no_shallow;
 static int deepen;
 static char *option_template, *option_depth, *option_since;
 static char *option_origin = NULL;
@@ -90,6 +91,7 @@ static struct option builtin_clone_options[] = {
 	OPT__VERBOSITY(&option_verbosity),
 	OPT_BOOL(0, "progress", &option_progress,
 		 N_("force progress reporting")),
+	OPT_BOOL(0, "no-shallow", &option_no_shallow, N_("don't clone shallow repository")),
 	OPT_BOOL('n', "no-checkout", &option_no_checkout,
 		 N_("don't create a checkout")),
 	OPT_BOOL(0, "bare", &option_bare, N_("create a bare repository")),
@@ -858,6 +860,9 @@ static int git_clone_config(const char *k, const char *v, void *cb)
 		free(remote_name);
 		remote_name = xstrdup(v);
 	}
+	if (!strcmp(k, "clone.rejectshallow")) {
+		option_no_shallow = 1;
+	}
 	return git_default_config(k, v, cb);
 }
 
@@ -963,6 +968,7 @@ static int path_exists(const char *path)
 int cmd_clone(int argc, const char **argv, const char *prefix)
 {
 	int is_bundle = 0, is_local;
+	int is_shallow = 0;
 	const char *repo_name, *repo, *work_tree, *git_dir;
 	char *path, *dir, *display_repo = NULL;
 	int dest_exists, real_dest_exists = 0;
@@ -1215,6 +1221,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		if (filter_options.choice)
 			warning(_("--filter is ignored in local clones; use file:// instead."));
 		if (!access(mkpath("%s/shallow", path), F_OK)) {
+			is_shallow = 1;
 			if (option_local > 0)
 				warning(_("source repository is shallow, ignoring --local"));
 			is_local = 0;
@@ -1222,6 +1229,12 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	}
 	if (option_local > 0 && !is_local)
 		warning(_("--local is ignored"));
+
+	if (is_shallow) {
+		if (option_no_shallow)
+			die(_("source repository is shallow, reject to clone."));
+	}
+
 	transport->cloning = 1;
 
 	transport_set_option(transport, TRANS_OPT_KEEP, "yes");
diff --git a/t/t5606-clone-options.sh b/t/t5606-clone-options.sh
index 5d6e63a841f7..e9b2bde8be8e 100755
--- a/t/t5606-clone-options.sh
+++ b/t/t5606-clone-options.sh
@@ -45,6 +45,13 @@ test_expect_success 'disallows --bare with --separate-git-dir' '
 
 '
 
+test_expect_success 'reject clone shallow repository' '
+	git clone --depth=1 --no-local parent shallow-repo &&
+	test_must_fail git clone --no-shallow shallow-repo out 2>err &&
+	test_i18ngrep -e "source repository is shallow, reject to clone." err
+
+'
+
 test_expect_success 'uses "origin" for default remote name' '
 
 	git clone parent clone-default-origin &&
diff --git a/t/t5611-clone-config.sh b/t/t5611-clone-config.sh
index 9f555b87ecdf..68fdf5b7ce1b 100755
--- a/t/t5611-clone-config.sh
+++ b/t/t5611-clone-config.sh
@@ -95,6 +95,13 @@ test_expect_success 'clone -c remote.<remote>.fetch=<refspec> --origin=<name>' '
 	test_cmp expect actual
 '
 
+test_expect_success 'clone -c clone.rejectshallow' '
+	rm -rf child &&
+	git clone --depth=1 --no-local . child &&
+	test_must_fail git clone -c clone.rejectshallow child out 2>err &&
+	test_i18ngrep -e "source repository is shallow, reject to clone." err
+'
+
 test_expect_success MINGW 'clone -c core.hideDotFiles' '
 	test_commit attributes .gitattributes "" &&
 	rm -rf child &&
-- 
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