All submodules must have the same ref storage (for now). Confirm that
this is so before attempting to do anything with submodule refs.
Signed-off-by: David Turner <dturner@xxxxxxxxxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
refs.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
refs.h | 2 +-
refs/files-backend.c | 8 ++------
3 files changed, 57 insertions(+), 7 deletions(-)
diff --git a/refs.c b/refs.c
index a18cb4d..5d69179 100644
--- a/refs.c
+++ b/refs.c
@@ -301,6 +301,54 @@ int for_each_tag_ref(each_ref_fn fn, void *cb_data)
return for_each_ref_in("refs/tags/", fn, cb_data);
}
+static int submodule_backend(const char *key, const char *value, void *data)
+{
+ const char **path = data;
+ char **old_path = data;
+ if (!strcmp(key, "extensions.refstorage") &&
+ !git_config_string(path, key, "extensions.refstorage"))
+ free(*old_path);
+
+ return 0;
+}
+
+/*
+ * Check that a submodule exists. If its ref storage backend differs
+ * from the current backend, die. If the submodule exists, return
+ * 0. Else return -1.
+ */
+static int check_submodule_backend(const char *submodule)
+{
+ struct strbuf sb = STRBUF_INIT;
+ char *submodule_storage_backend;
+ int result = -1;
+
+ if (!submodule)
+ return 0;
+
+ submodule_storage_backend = xstrdup("files");
+
+ strbuf_addstr(&sb, submodule);
+ if (!is_nonbare_repository_dir(&sb))
+ goto done;
+
+ strbuf_reset(&sb);
+ strbuf_git_path_submodule(&sb, submodule, "config");
+
+ git_config_from_file(submodule_backend, sb.buf,
+ &submodule_storage_backend);
+ if (strcmp(submodule_storage_backend, ref_storage_backend))
+ die(_("Ref storage '%s' for submodule '%s' does not match our storage, '%s'"),
+ submodule_storage_backend, submodule, ref_storage_backend);
+
+ result = 0;
+done:
+ free(submodule_storage_backend);
+ strbuf_release(&sb);
+
+ return result;
+}
+
int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
@@ -313,6 +361,7 @@ int for_each_branch_ref(each_ref_fn fn, void *cb_data)
int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
+ check_submodule_backend(submodule);
return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
}
@@ -323,6 +372,7 @@ int for_each_remote_ref(each_ref_fn fn, void *cb_data)
int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
{
+ check_submodule_backend(submodule);
return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
}
@@ -1138,6 +1188,7 @@ int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
int flag;
if (submodule) {
+ check_submodule_backend(submodule);
if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
return fn("HEAD", &oid, 0, cb_data);
@@ -1561,6 +1612,9 @@ int create_symref(const char *ref_target, const char *refs_heads_master,
int resolve_gitlink_ref(const char *path, const char *refname,
unsigned char *sha1)
{
+ if (check_submodule_backend(path))
+ return -1;
+
return the_refs_backend->resolve_gitlink_ref(path, refname, sha1);
}
diff --git a/refs.h b/refs.h
index 09486b2..1888ad8 100644
--- a/refs.h
+++ b/refs.h
@@ -512,7 +512,7 @@ extern int reflog_expire(const char *refname, const unsigned char *sha1,
void *policy_cb_data);
/*
- * Read the refdb storage backend name out of the config file
+ * Read the ref storage backend name out of the config file
*/
int ref_storage_backend_config(const char *var, const char *value, void *ptr);
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 7ccaf88..a13d419 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1347,13 +1347,9 @@ static int files_resolve_gitlink_ref(const char *path, const char *refname,
strbuf_add(&submodule, path, len);
refs = lookup_ref_cache(submodule.buf);
- if (!refs) {
- if (!is_nonbare_repository_dir(&submodule)) {
- strbuf_release(&submodule);
- return -1;
- }
+ if (!refs)
refs = create_ref_cache(submodule.buf);
- }
+
strbuf_release(&submodule);
retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
--
2.4.2.767.g62658d5-twtrsrc
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