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clone --single: limit the fetch refspec to fetched branch

After running "git clone --single", the resulting repository has the
usual default "+refs/heads/*:refs/remotes/origin/*" wildcard fetch
refspec installed, which means that a subsequent "git fetch" will
end up grabbing all the other branches.

Update the fetch refspec to cover only the singly cloned ref instead
to correct this.

That means:
If "--single" is used without "--branch" or "--mirror", the
fetch refspec covers the branch on which remote's HEAD points to.
If "--single" is used with "--branch", it'll cover only the branch
specified in the "--branch" option.
If "--single" is combined with "--mirror", then it'll cover all
refs of the cloned repository.
If "--single" is used with "--branch" that specifies a tag, then
it'll cover only the ref for this tag.

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent 1403db4 commit 31b808a03290a4f87c571cc1c61f26d8a03c7025 @ralfth ralfth committed with gitster Sep 20, 2012
Showing with 218 additions and 18 deletions.
  1. +11 −4 Documentation/git-clone.txt
  2. +51 −14 builtin/clone.c
  3. +156 −0 t/t5709-clone-refspec.sh
@@ -29,7 +29,8 @@ currently active branch.
After the clone, a plain `git fetch` without arguments will update
all the remote-tracking branches, and a `git pull` without
arguments will in addition merge the remote master branch into the
-current master branch, if any.
+current master branch, if any (this is untrue when "--single-branch"
+is given; see below).
This default configuration is achieved by creating references to
the remote branch heads under `refs/remotes/origin` and
@@ -147,9 +148,10 @@ objects from the source repository into a pack in the cloned repository.
-b <name>::
Instead of pointing the newly created HEAD to the branch pointed
to by the cloned repository's HEAD, point to `<name>` branch
- instead. `--branch` can also take tags and treat them like
- detached HEAD. In a non-bare repository, this is the branch
- that will be checked out.
+ instead. In a non-bare repository, this is the branch that will
+ be checked out.
+ `--branch` can also take tags and detaches the HEAD at that commit
+ in the resulting repository.
--upload-pack <upload-pack>::
-u <upload-pack>::
@@ -188,6 +190,11 @@ objects from the source repository into a pack in the cloned repository.
clone with the `--depth` option, this is the default, unless
`--no-single-branch` is given to fetch the histories near the
tips of all branches.
+ Further fetches into the resulting repository will only update the
+ remote tracking branch for the branch this option was used for the
+ initial cloning. If the HEAD at the remote did not point at any
+ branch when `--single-branch` clone was made, no remote tracking
+ branch is created.
--recursive::
--recurse-submodules::
View
@@ -610,6 +610,54 @@ static void write_config(struct string_list *config)
}
}
+static void write_refspec_config(const char* src_ref_prefix,
+ const struct ref* our_head_points_at,
+ const struct ref* remote_head_points_at, struct strbuf* branch_top)
+{
+ struct strbuf key = STRBUF_INIT;
+ struct strbuf value = STRBUF_INIT;
+
+ if (option_mirror || !option_bare) {
+ if (option_single_branch && !option_mirror) {
+ if (option_branch) {
+ if (strstr(our_head_points_at->name, "refs/tags/"))
+ strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
+ our_head_points_at->name);
+ else
+ strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
+ branch_top->buf, option_branch);
+ } else if (remote_head_points_at) {
+ strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
+ branch_top->buf,
+ skip_prefix(remote_head_points_at->name, "refs/heads/"));
+ }
+ /*
+ * otherwise, the next "git fetch" will
+ * simply fetch from HEAD without updating
+ * any remote tracking branch, which is what
+ * we want.
+ */
+ } else {
+ strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
+ }
+ /* Configure the remote */
+ if (value.len) {
+ strbuf_addf(&key, "remote.%s.fetch", option_origin);
+ git_config_set_multivar(key.buf, value.buf, "^$", 0);
+ strbuf_reset(&key);
+
+ if (option_mirror) {
+ strbuf_addf(&key, "remote.%s.mirror", option_origin);
+ git_config_set(key.buf, "true");
+ strbuf_reset(&key);
+ }
+ }
+ }
+
+ strbuf_release(&key);
+ strbuf_release(&value);
+}
+
int cmd_clone(int argc, const char **argv, const char *prefix)
{
int is_bundle = 0, is_local;
@@ -755,20 +803,6 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
}
strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
-
- if (option_mirror || !option_bare) {
- /* Configure the remote */
- strbuf_addf(&key, "remote.%s.fetch", option_origin);
- git_config_set_multivar(key.buf, value.buf, "^$", 0);
- strbuf_reset(&key);
-
- if (option_mirror) {
- strbuf_addf(&key, "remote.%s.mirror", option_origin);
- git_config_set(key.buf, "true");
- strbuf_reset(&key);
- }
- }
-
strbuf_addf(&key, "remote.%s.url", option_origin);
git_config_set(key.buf, repo);
strbuf_reset(&key);
@@ -853,6 +887,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
"refs/heads/master");
}
+ write_refspec_config(src_ref_prefix, our_head_points_at,
+ remote_head_points_at, &branch_top);
+
if (is_local)
clone_local(path, git_dir);
else if (refs && complete_refs_before_fetch)
View
@@ -0,0 +1,156 @@
+#!/bin/sh
+
+test_description='test refspec written by clone-command'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ # Make two branches, "master" and "side"
+ echo one >file &&
+ git add file &&
+ git commit -m one &&
+ echo two >file &&
+ git commit -a -m two &&
+ git tag two &&
+ echo three >file &&
+ git commit -a -m three &&
+ git checkout -b side &&
+ echo four >file &&
+ git commit -a -m four &&
+ git checkout master &&
+
+ # default clone
+ git clone . dir_all &&
+
+ # default --single that follows HEAD=master
+ git clone --single-branch . dir_master &&
+
+ # default --single that follows HEAD=side
+ git checkout side &&
+ git clone --single-branch . dir_side &&
+
+ # explicit --single that follows side
+ git checkout master &&
+ git clone --single-branch --branch side . dir_side2 &&
+
+ # default --single with --mirror
+ git clone --single-branch --mirror . dir_mirror &&
+
+ # default --single with --branch and --mirror
+ git clone --single-branch --mirror --branch side . dir_mirror_side &&
+
+ # --single that does not know what branch to follow
+ git checkout two^ &&
+ git clone --single-branch . dir_detached &&
+
+ # explicit --single with tag
+ git clone --single-branch --branch two . dir_tag &&
+
+ # advance both "master" and "side" branches
+ git checkout side &&
+ echo five >file &&
+ git commit -a -m five &&
+ git checkout master &&
+ echo six >file &&
+ git commit -a -m six &&
+
+ # update tag
+ git tag -d two && git tag two
+'
+
+test_expect_success 'by default all branches will be kept updated' '
+ (
+ cd dir_all && git fetch &&
+ git for-each-ref refs/remotes/origin |
+ sed -e "/HEAD$/d" \
+ -e "s|/remotes/origin/|/heads/|" >../actual
+ ) &&
+ # follow both master and side
+ git for-each-ref refs/heads >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success 'by default no tags will be kept updated' '
+ (
+ cd dir_all && git fetch &&
+ git for-each-ref refs/tags >../actual
+ ) &&
+ git for-each-ref refs/tags >expect &&
+ test_must_fail test_cmp expect actual
+'
+
+test_expect_success '--single-branch while HEAD pointing at master' '
+ (
+ cd dir_master && git fetch &&
+ git for-each-ref refs/remotes/origin |
+ sed -e "/HEAD$/d" \
+ -e "s|/remotes/origin/|/heads/|" >../actual
+ ) &&
+ # only follow master
+ git for-each-ref refs/heads/master >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success '--single-branch while HEAD pointing at side' '
+ (
+ cd dir_side && git fetch &&
+ git for-each-ref refs/remotes/origin |
+ sed -e "/HEAD$/d" \
+ -e "s|/remotes/origin/|/heads/|" >../actual
+ ) &&
+ # only follow side
+ git for-each-ref refs/heads/side >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success '--single-branch with explicit --branch side' '
+ (
+ cd dir_side2 && git fetch &&
+ git for-each-ref refs/remotes/origin |
+ sed -e "/HEAD$/d" \
+ -e "s|/remotes/origin/|/heads/|" >../actual
+ ) &&
+ # only follow side
+ git for-each-ref refs/heads/side >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success '--single-branch with explicit --branch with tag fetches updated tag' '
+ (
+ cd dir_tag && git fetch &&
+ git for-each-ref refs/tags >../actual
+ ) &&
+ git for-each-ref refs/tags >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success '--single-branch with --mirror' '
+ (
+ cd dir_mirror && git fetch &&
+ git for-each-ref refs > ../actual
+ ) &&
+ git for-each-ref refs >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success '--single-branch with explicit --branch and --mirror' '
+ (
+ cd dir_mirror_side && git fetch &&
+ git for-each-ref refs > ../actual
+ ) &&
+ git for-each-ref refs >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success '--single-branch with detached' '
+ (
+ cd dir_detached && git fetch &&
+ git for-each-ref refs/remotes/origin |
+ sed -e "/HEAD$/d" \
+ -e "s|/remotes/origin/|/heads/|" >../actual
+ )
+ # nothing
+ >expect &&
+ test_cmp expect actual
+'
+
+test_done

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