Signed-off-by: Tay Ray Chuan <rctay89@xxxxxxxxx>
---
Documentation/git-checkout.txt | 15 +++++++++++-
builtin/checkout.c | 7 ++++-
t/t2018-checkout-branch.sh | 45 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 63 insertions(+), 4 deletions(-)
diff --git a/Documentation/git-checkout.txt b/Documentation/git-checkout.txt
index 261dd90..5849e13 100644
--- a/Documentation/git-checkout.txt
+++ b/Documentation/git-checkout.txt
@@ -9,7 +9,7 @@ SYNOPSIS
--------
[verse]
'git checkout' [-q] [-f] [-m] [<branch>]
-'git checkout' [-q] [-f] [-m] [[-b|--orphan] <new_branch>] [<start_point>]
+'git checkout' [-q] [-f] [-m] [[-b|-B|--orphan] <new_branch>] [<start_point>]
'git checkout' [-f|--ours|--theirs|-m|--conflict=<style>] [<tree-ish>] [--] <paths>...
'git checkout' --patch [<tree-ish>] [--] [<paths>...]
@@ -21,7 +21,7 @@ also update `HEAD` to set the specified branch as the current
branch.
'git checkout' [<branch>]::
-'git checkout' -b <new branch> [<start point>]::
+'git checkout' -b|-B <branch> [<start point>]::
This form switches branches by updating the index, working
tree, and HEAD to reflect the specified branch.
@@ -31,6 +31,13 @@ were called and then checked out; in this case you can
use the `--track` or `--no-track` options, which will be passed to
'git branch'. As a convenience, `--track` without `-b` implies branch
creation; see the description of `--track` below.
++
+If `-B` is given, <branch> is created if it doesn't exist; otherwise, it
+is reset. This is equivalent to
++
+------------
+$ git branch -f <branch> [<start point>] && git checkout <branch>
+------------
'git checkout' [--patch] [<tree-ish>] [--] <pathspec>...::
@@ -75,6 +82,10 @@ entries; instead, unmerged entries are ignored.
Create a new branch named <new_branch> and start it at
<start_point>; see linkgit:git-branch[1] for details.
+-B::
+ Checks out to the branch named <branch>, creating it if it does
+ not exist; otherwise, the branch is reset.
+
-t::
--track::
When creating a new branch, set up "upstream" configuration. See
diff --git a/builtin/checkout.c b/builtin/checkout.c
index e794e1e..f7c2cdd 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -512,7 +512,8 @@ static void update_refs_for_switch(struct checkout_opts *opts,
}
}
else
- create_branch(old->name, opts->new_branch_name, new->name, 0,
+ create_branch(old->name, opts->new_branch_name, new->name,
+ opts->new_branch > 1,
opts->new_branch_log, opts->track);
new->name = opts->new_branch_name;
setup_branch_path(new);
@@ -660,6 +661,8 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
OPT__QUIET(&opts.quiet),
OPT_SET_INT('b', NULL, &opts.new_branch,
"create and checkout a new branch", 1),
+ OPT_SET_INT('B', NULL, &opts.new_branch,
+ "create and checkout a branch, resetting it if it exists", 2),
OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "log for new branch"),
OPT_SET_INT('t', "track", &opts.track, "track",
BRANCH_TRACK_EXPLICIT),
@@ -869,7 +872,7 @@ no_reference:
if (strbuf_check_branch_ref(&buf, opts.new_branch_name))
die("git checkout: we do not like '%s' as a branch name.",
opts.new_branch_name);
- if (!get_sha1(buf.buf, rev))
+ if (!get_sha1(buf.buf, rev) && !(opts.new_branch > 1))
die("git checkout: branch %s already exists", opts.new_branch_name);
strbuf_release(&buf);
}
diff --git a/t/t2018-checkout-branch.sh b/t/t2018-checkout-branch.sh
index 3c13065..1caffea 100755
--- a/t/t2018-checkout-branch.sh
+++ b/t/t2018-checkout-branch.sh
@@ -118,4 +118,49 @@ test_expect_success 'checkout -b to an existing branch fails' '
test_must_fail do_checkout branch2 $HEAD2
'
+test_expect_success 'checkout -B to an existing branch resets branch to HEAD' '
+ git checkout branch1 &&
+
+ do_checkout branch2 "" -B
+'
+
+test_expect_success 'checkout -B to an existing branch with an explicit ref resets branch to that ref' '
+ git checkout branch1 &&
+
+ do_checkout branch2 $HEAD1 -B
+'
+
+test_expect_success 'checkout -B to an existing branch with unmergeable changes fails' '
+ git checkout branch1 &&
+
+ setup_dirty_unmergeable &&
+ test_must_fail do_checkout branch2 $HEAD1 -B &&
+ test_dirty_unmergeable
+'
+
+test_expect_success 'checkout -f -B to an existing branch with unmergeable changes discards changes' '
+ # still dirty and on branch1
+ do_checkout branch2 $HEAD1 "-f -B" &&
+ test_must_fail test_dirty_unmergeable
+'
+
+test_expect_success 'checkout -B to an existing branch preserves mergeable changes' '
+ git checkout branch1 &&
+
+ setup_dirty_mergeable &&
+ do_checkout branch2 $HEAD1 -B &&
+ test_dirty_mergeable
+'
+
+test_expect_success 'checkout -f -B to an existing branch with mergeable changes discards changes' '
+ # clean up from previous test
+ git reset --hard &&
+
+ git checkout branch1 &&
+
+ setup_dirty_mergeable &&
+ do_checkout branch2 $HEAD1 "-f -B" &&
+ test_must_fail test_dirty_mergeable
+'
+
test_done
--
1.7.1.513.g4f18
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