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git checkout -b: allow switching out of an unborn branch

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Running "git checkout -b another" immediately after "git init" when you do
not even have a commit on 'master' fails with:

    $ git checkout -b another
    fatal: You are on a branch yet to be born

This is unnecessary, if we redefine "git checkout -b $name" that does not
take any $start_point (which has to be a commit) as "I want to check out a
new branch $name from the state I am in".

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2012-01-30 12:10:08 -08:00
parent 04f6785a08
commit abe199808c
2 changed files with 29 additions and 1 deletions
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19
builtin/checkout.c
View File

@ -916,6 +916,17 @@ static int parse_branchname_arg(int argc, const char **argv,
return argcount;
}
static int switch_unborn_to_new_branch(struct checkout_opts *opts)
{
int status;
struct strbuf branch_ref = STRBUF_INIT;
strbuf_addf(&branch_ref, "refs/heads/%s", opts->new_branch);
status = create_symref("HEAD", branch_ref.buf, "checkout -b");
strbuf_release(&branch_ref);
return status;
}
int cmd_checkout(int argc, const char **argv, const char *prefix)
{
struct checkout_opts opts;
@ -1089,5 +1100,13 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
if (opts.writeout_stage)
die(_("--ours/--theirs is incompatible with switching branches."));
if (!new.commit) {
unsigned char rev[20];
int flag;
resolve_ref("HEAD", rev, 0, &flag);
if ((flag & REF_ISSYMREF) && is_null_sha1(rev))
return switch_unborn_to_new_branch(&opts);
}
return switch_branches(&opts, &new);
}

11
t/t2015-checkout-unborn.sh
View File

@ -1,6 +1,6 @@
#!/bin/sh
test_description='checkout from unborn branch protects contents'
test_description='checkout from unborn branch'
. ./test-lib.sh
test_expect_success 'setup' '
@ -37,4 +37,13 @@ test_expect_success 'checkout from unborn merges identical index contents' '
git checkout -b new origin
'
test_expect_success 'checking out another branch from unborn state' '
git checkout --orphan newroot &&
git checkout -b anothername &&
test_must_fail git show-ref --verify refs/heads/newroot &&
git symbolic-ref HEAD >actual &&
echo refs/heads/anothername >expect &&
test_cmp expect actual
'
test_done