Allow the empty string to stand in for the null SHA-1 when pushing a new
branch, like we do when deleting branches.
This means that the following command ensures that `new-branch` is
created on the remote (that is, is must not already exist):
git push --force-with-lease=new-branch: origin new-branch
Signed-off-by: John Keeping <j...@keeping.me.uk>
---
Changes in v3:
- use hashclr()
- pull 'new branch already exists' test forward from patch 3 and use
explicit --force-with-lease syntax
Documentation/git-push.txt | 3 ++-
remote.c | 2 ++
t/t5533-push-cas.sh | 26 ++++++++++++++++++++++++++
3 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/Documentation/git-push.txt b/Documentation/git-push.txt
index bf7c9a2..927a034 100644
--- a/Documentation/git-push.txt
+++ b/Documentation/git-push.txt
@@ -201,7 +201,8 @@ if it is going to be updated, by requiring its current
value to be
the same as the specified value `<expect>` (which is allowed to be
different from the remote-tracking branch we have for the refname,
or we do not even have to have such a remote-tracking branch when
-this form is used).
+this form is used). If `<expect>` is the empty string, then the named ref
+must not already exist.
+
Note that all forms other than `--force-with-lease=<refname>:<expect>`
that specifies the expected current value of the ref explicitly are
diff --git a/remote.c b/remote.c
index a326e4e..42c4a34 100644
--- a/remote.c
+++ b/remote.c
@@ -2294,6 +2294,8 @@ int parse_push_cas_option(struct push_cas_option *cas,
const char *arg, int unse
entry = add_cas_entry(cas, arg, colon - arg);
if (!*colon)
entry->use_tracking = 1;
+ else if (!colon[1])
+ hashclr(entry->expect);
else if (get_sha1(colon + 1, entry->expect))
return error("cannot parse expected object name '%s'", colon +
1);
return 0;
diff --git a/t/t5533-push-cas.sh b/t/t5533-push-cas.sh
index c732012..ed631c3 100755
--- a/t/t5533-push-cas.sh
+++ b/t/t5533-push-cas.sh
@@ -191,4 +191,30 @@ test_expect_success 'cover everything with default
force-with-lease (allowed)' '
test_cmp expect actual
'
+test_expect_success 'new branch covered by force-with-lease (explicit)' '
+ setup_srcdst_basic &&
+ (
+ cd dst &&
+ git branch branch master &&
+ git push --force-with-lease=branch: origin branch
+ ) &&
+ git ls-remote dst refs/heads/branch >expect &&
+ git ls-remote src refs/heads/branch >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'new branch already exists' '
+ setup_srcdst_basic &&
+ (
+ cd src &&
+ git checkout -b branch master &&
+ test_commit c
+ ) &&
+ (
+ cd dst &&
+ git branch branch master &&
+ test_must_fail git push --force-with-lease=branch: origin branch
+ )
+'
+
test_done
--
2.9.2.639.g855ae9f
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