branch: introduce --set-upstream-to

The existing --set-uptream option can cause confusion, as it uses the
usual branch convention of assuming a starting point of HEAD if none
is specified, causing

    git branch --set-upstream origin/master

to create a new local branch 'origin/master' that tracks the current
branch. As --set-upstream already exists, we can't simply change its
behaviour. To work around this, introduce --set-upstream-to which
accepts a compulsory argument indicating what the new upstream branch
should be and one optinal argument indicating which branch to change,
defaulting to HEAD.

The new options allows us to type

    git branch --set-upstream-to origin/master

to set the current branch's upstream to be origin's master.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-branch.txt b/Documentation/git-branch.txt
index 47235bea0403bf25fa73529a37a7c5f87d0d7eb9..e41c4b55fd421f96a6cbed9573d6848b8f783922 100644 (file)
--- a/Documentation/git-branch.txt
+++ b/Documentation/git-branch.txt
@@ -13,6 +13,7 @@ SYNOPSIS
        [--column[=<options>] | --no-column]
        [(--merged | --no-merged | --contains) [<commit>]] [<pattern>...]
 'git branch' [--set-upstream | --track | --no-track] [-l] [-f] <branchname> [<start-point>]
+'git branch' (--set-upstream-to=<upstream> | -u <upstream>) [<branchname>]
 'git branch' (-m | -M) [<oldbranch>] <newbranch>
 'git branch' (-d | -D) [-r] <branchname>...
 'git branch' --edit-description [<branchname>]
@@ -48,7 +49,7 @@ branch so that 'git pull' will appropriately merge from
 the remote-tracking branch. This behavior may be changed via the global
 `branch.autosetupmerge` configuration flag. That setting can be
 overridden by using the `--track` and `--no-track` options, and
-changed later using `git branch --set-upstream`.
+changed later using `git branch --set-upstream-to`.
 
 With a `-m` or `-M` option, <oldbranch> will be renamed to <newbranch>.
 If <oldbranch> had a corresponding reflog, it is renamed to match
@@ -173,6 +174,12 @@ start-point is either a local or remote-tracking branch.
        like `--track` would when creating the branch, except that where
        branch points to is not changed.
 
+-u <upstream>::
+--set-upstream-to=<upstream>::
+       Set up <branchname>'s tracking information so <upstream> is
+       considered <branchname>'s upstream branch. If no <branchname>
+       is specified, then it defaults to the current branch.
+
 --edit-description::
        Open an editor and edit the text to explain what the branch is
        for, to be used by various other commands (e.g. `request-pull`).

diff --git a/builtin/branch.c b/builtin/branch.c
index 0e060f2e4a982efdda0f88d021e0a9d3f23c6b75..3c978eb18e70ef29ea9f8eb7deb7b8551328e8e0 100644 (file)
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -713,6 +713,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
        int verbose = 0, abbrev = -1, detached = 0;
        int reflog = 0, edit_description = 0;
        int quiet = 0;
+       const char *new_upstream = NULL;
        enum branch_track track;
        int kinds = REF_LOCAL_BRANCH;
        struct commit_list *with_commit = NULL;
@@ -726,6 +727,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                        BRANCH_TRACK_EXPLICIT),
                OPT_SET_INT( 0, "set-upstream",  &track, "change upstream info",
                        BRANCH_TRACK_OVERRIDE),
+               OPT_STRING('u', "set-upstream-to", &new_upstream, "upstream", "change the upstream info"),
                OPT__COLOR(&branch_use_color, "use colored output"),
                OPT_SET_INT('r', "remotes",     &kinds, "act on remote-tracking branches",
                        REF_REMOTE_BRANCH),
@@ -794,10 +796,10 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
        argc = parse_options(argc, argv, prefix, options, builtin_branch_usage,
                             0);
 
-       if (!delete && !rename && !edit_description && argc == 0)
+       if (!delete && !rename && !edit_description && !new_upstream && argc == 0)
                list = 1;
 
-       if (!!delete + !!rename + !!force_create + !!list > 1)
+       if (!!delete + !!rename + !!force_create + !!list + !!new_upstream > 1)
                usage_with_options(builtin_branch_usage, options);
 
        if (abbrev == -1)
@@ -852,6 +854,17 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                        rename_branch(argv[0], argv[1], rename > 1);
                else
                        usage_with_options(builtin_branch_usage, options);
+       } else if (new_upstream) {
+               struct branch *branch = branch_get(argv[0]);
+
+               if (!ref_exists(branch->refname))
+                       die(_("branch '%s' does not exist"), branch->name);
+
+               /*
+                * create_branch takes care of setting up the tracking
+                * info and making sure new_upstream is correct
+                */
+               create_branch(head, branch->name, new_upstream, 0, 0, 0, quiet, BRANCH_TRACK_OVERRIDE);
        } else if (argc > 0 && argc <= 2) {
                if (kinds != REF_LOCAL_BRANCH)
                        die(_("-a and -r options to 'git branch' do not make sense with a branch name"));

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index a17f8b2a407c2de2bf81d8a858957da409f1c980..e9019ac9432f88500f26ffb08295daff67de8908 100755 (executable)
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -369,6 +369,20 @@ test_expect_success \
     'git tag foobar &&
      test_must_fail git branch --track my11 foobar'
 
+test_expect_success 'use --set-upstream-to modify HEAD' \
+    'test_config branch.master.remote foo &&
+     test_config branch.master.merge foo &&
+     git branch my12
+     git branch --set-upstream-to my12 &&
+     test "$(git config branch.master.remote)" = "." &&
+     test "$(git config branch.master.merge)" = "refs/heads/my12"'
+
+test_expect_success 'use --set-upstream-to modify a particular branch' \
+    'git branch my13
+     git branch --set-upstream-to master my13 &&
+     test "$(git config branch.my13.remote)" = "." &&
+     test "$(git config branch.my13.merge)" = "refs/heads/master"'
+
 # Keep this test last, as it changes the current branch
 cat >expect <<EOF
 $_z40 $HEAD $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1117150200 +0000        branch: Created from master