While use of the --reference option to borrow objects from an existing local repository of the same project is an effective way to reduce traffic when cloning a project over the network, it makes the resulting "borrowing" repository dependent on the "borrowed" repository. After running git clone --reference=P $URL Q the resulting repository Q will be broken if the borrowed repository P disappears. The way to allow the borrowed repository to be removed is to repack the borrowing repository (i.e. run "git repack -a -d" in Q); while power users may know it very well, it is not easily discoverable. Teach a new "--dissociate" option to "git clone" to run this repacking for the user. Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx> --- * This comes from http://thread.gmane.org/gmane.comp.version-control.git/243918/focus=245397 which is one of the low-hanging entries in the leftover-bits list http://git-blame.blogspot.com/p/leftover-bits.html Yes, I must have been really bored to do this ;-) Documentation/git-clone.txt | 11 +++++++++-- builtin/clone.c | 25 +++++++++++++++++++++++++ t/t5700-clone-reference.sh | 17 +++++++++++++++++ 3 files changed, 51 insertions(+), 2 deletions(-) diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt index 0363d00..f1f2a3f 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 bbd169c..780fbd5 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 +739,21 @@ static void write_refspec_config(const char* src_ref_prefix, strbuf_release(&value); } +static void dissociate_from_references(void) +{ + struct child_process cmd; + + memset(&cmd, 0, sizeof(cmd)); + argv_array_pushl(&cmd.args, "repack", "-a", "-d", NULL); + cmd.git_cmd = 1; + cmd.out = -1; + cmd.no_stdin = 1; + if (run_command(&cmd)) + 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 +901,10 @@ 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 +1018,9 @@ 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 6537911..3e783fc 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 -- 2.1.2-488-g6ab273f -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html