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-rw-r--r--Documentation/git-clone.txt11
-rw-r--r--builtin/clone.c20
-rwxr-xr-xt/t5700-clone-reference.sh17
3 files changed, 46 insertions, 2 deletions
diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 0363d0039b..f1f2a3f7ea 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -12,7 +12,7 @@ SYNOPSIS
'git clone' [--template=<template_directory>]
[-l] [-s] [--no-hardlinks] [-q] [-n] [--bare] [--mirror]
[-o <name>] [-b <name>] [-u <upload-pack>] [--reference <repository>]
- [--separate-git-dir <git dir>]
+ [--dissociate] [--separate-git-dir <git dir>]
[--depth <depth>] [--[no-]single-branch]
[--recursive | --recurse-submodules] [--] <repository>
[<directory>]
@@ -98,7 +98,14 @@ objects from the source repository into a pack in the cloned repository.
require fewer objects to be copied from the repository
being cloned, reducing network and local storage costs.
+
-*NOTE*: see the NOTE for the `--shared` option.
+*NOTE*: see the NOTE for the `--shared` option, and also the
+`--dissociate` option.
+
+--dissociate::
+ Borrow the objects from reference repositories specified
+ with the `--reference` options only to reduce network
+ transfer and stop borrowing from them after a clone is made
+ by making necessary local copies of borrowed objects.
--quiet::
-q::
diff --git a/builtin/clone.c b/builtin/clone.c
index bbd169ceb4..e1ad4df41f 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -48,6 +48,7 @@ static int option_verbosity;
static int option_progress = -1;
static struct string_list option_config;
static struct string_list option_reference;
+static int option_dissociate;
static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
{
@@ -93,6 +94,8 @@ static struct option builtin_clone_options[] = {
N_("create a shallow clone of that depth")),
OPT_BOOL(0, "single-branch", &option_single_branch,
N_("clone only one branch, HEAD or --branch")),
+ OPT_BOOL(0, "dissociate", &option_dissociate,
+ N_("use --reference only while cloning")),
OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
N_("separate git dir from working tree")),
OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
@@ -736,6 +739,16 @@ static void write_refspec_config(const char* src_ref_prefix,
strbuf_release(&value);
}
+static void dissociate_from_references(void)
+{
+ static const char* argv[] = { "repack", "-a", "-d", NULL };
+
+ if (run_command_v_opt(argv, RUN_GIT_CMD|RUN_COMMAND_NO_STDIN))
+ die(_("cannot repack to clean up"));
+ if (unlink(git_path("objects/info/alternates")) && errno != ENOENT)
+ die_errno(_("cannot unlink temporary alternates file"));
+}
+
int cmd_clone(int argc, const char **argv, const char *prefix)
{
int is_bundle = 0, is_local;
@@ -883,6 +896,10 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
if (option_reference.nr)
setup_reference();
+ else if (option_dissociate) {
+ warning(_("--dissociate given, but there is no --reference"));
+ option_dissociate = 0;
+ }
fetch_pattern = value.buf;
refspec = parse_fetch_refspec(1, &fetch_pattern);
@@ -996,6 +1013,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
transport_unlock_pack(transport);
transport_disconnect(transport);
+ if (option_dissociate)
+ dissociate_from_references();
+
junk_mode = JUNK_LEAVE_REPO;
err = checkout();
diff --git a/t/t5700-clone-reference.sh b/t/t5700-clone-reference.sh
index 6537911a43..3e783fc450 100755
--- a/t/t5700-clone-reference.sh
+++ b/t/t5700-clone-reference.sh
@@ -198,4 +198,21 @@ test_expect_success 'clone using repo pointed at by gitfile as reference' '
test_cmp expected "$base_dir/O/.git/objects/info/alternates"
'
+test_expect_success 'clone and dissociate from reference' '
+ git init P &&
+ (
+ cd P && test_commit one
+ ) &&
+ git clone P Q &&
+ (
+ cd Q && test_commit two
+ ) &&
+ git clone --no-local --reference=P Q R &&
+ git clone --no-local --reference=P --dissociate Q S &&
+ # removing the reference P would corrupt R but not S
+ rm -fr P &&
+ test_must_fail git -C R fsck &&
+ git -C S fsck
+'
+
test_done