In order to discern which ref storage format a repository is supposed to
use we need to start setting up and/or discovering the format. This
needs to happen in two separate code paths.
- The first path is when we create a repository via `init_db()`. When
we are re-initializing a preexisting repository we need to retain
the previously used ref storage format -- if the user asked for a
different format then this indicates an erorr and we error out.
Otherwise we either initialize the repository with the format asked
for by the user or the default format, which currently is the
"files" backend.
- The second path is when discovering repositories, where we need to
read the config of that repository. There is not yet any way to
configure something other than the "files" backend, so we can just
blindly set the ref storage format to this backend.
Wire up this logic so that we have the ref storage format always readily
available when needed. As there is only a single backend and because it
is not configurable we cannot yet verify that this tracking works as
expected via tests, but tests will be added in subsequent commits. To
countermand this ommission now though, raise a BUG() in case the ref
storage format is not set up properly in `ref_store_init()`.
Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
builtin/clone.c | 5 +++--
builtin/init-db.c | 4 +++-
refs.c | 6 +++---
refs.h | 1 +
repository.c | 1 +
repository.h | 3 +++
setup.c | 26 +++++++++++++++++++++++---
setup.h | 6 +++++-
8 files changed, 42 insertions(+), 10 deletions(-)
diff --git a/builtin/clone.c b/builtin/clone.c
index 339af10c10..6840064b59 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -1105,7 +1105,8 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
* repository, and reference backends may persist that information into
* their on-disk data structures.
*/
- init_db(git_dir, real_git_dir, option_template, GIT_HASH_UNKNOWN, NULL,
+ init_db(git_dir, real_git_dir, option_template, GIT_HASH_UNKNOWN,
+ REF_STORAGE_FORMAT_UNKNOWN, NULL,
do_not_override_repo_unix_permissions, INIT_DB_QUIET | INIT_DB_SKIP_REFDB);
if (real_git_dir) {
@@ -1290,7 +1291,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
hash_algo = hash_algo_by_ptr(transport_get_hash_algo(transport));
initialize_repository_version(hash_algo, 1);
repo_set_hash_algo(the_repository, hash_algo);
- create_reference_database(NULL, 1);
+ create_reference_database(the_repository->ref_storage_format, NULL, 1);
/*
* Before fetching from the remote, download and install bundle
diff --git a/builtin/init-db.c b/builtin/init-db.c
index cb727c826f..b6e80feab6 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -11,6 +11,7 @@
#include "object-file.h"
#include "parse-options.h"
#include "path.h"
+#include "refs.h"
#include "setup.h"
#include "strbuf.h"
@@ -236,5 +237,6 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
flags |= INIT_DB_EXIST_OK;
return init_db(git_dir, real_git_dir, template_dir, hash_algo,
- initial_branch, init_shared_repository, flags);
+ REF_STORAGE_FORMAT_UNKNOWN, initial_branch,
+ init_shared_repository, flags);
}
diff --git a/refs.c b/refs.c
index e87c85897d..d289a5e175 100644
--- a/refs.c
+++ b/refs.c
@@ -2045,12 +2045,12 @@ static struct ref_store *ref_store_init(struct repository *repo,
const char *gitdir,
unsigned int flags)
{
- int format = REF_STORAGE_FORMAT_FILES;
- const struct ref_storage_be *be = find_ref_storage_backend(format);
+ const struct ref_storage_be *be;
struct ref_store *refs;
+ be = find_ref_storage_backend(repo->ref_storage_format);
if (!be)
- BUG("reference backend %s is unknown", ref_storage_format_to_name(format));
+ BUG("reference backend is unknown");
refs = be->init(repo, gitdir, flags);
return refs;
diff --git a/refs.h b/refs.h
index c6571bcf6c..944a67ac1b 100644
--- a/refs.h
+++ b/refs.h
@@ -11,6 +11,7 @@ struct string_list;
struct string_list_item;
struct worktree;
+int default_ref_storage_format(void);
int ref_storage_format_by_name(const char *name);
const char *ref_storage_format_to_name(int ref_storage_format);
diff --git a/repository.c b/repository.c
index a7679ceeaa..a75c1598b0 100644
--- a/repository.c
+++ b/repository.c
@@ -184,6 +184,7 @@ int repo_init(struct repository *repo,
goto error;
repo_set_hash_algo(repo, format.hash_algo);
+ repo->ref_storage_format = format.ref_storage_format;
repo->repository_format_worktree_config = format.worktree_config;
/* take ownership of format.partial_clone */
diff --git a/repository.h b/repository.h
index ea4c488b81..22c30cdbc9 100644
--- a/repository.h
+++ b/repository.h
@@ -163,6 +163,9 @@ struct repository {
/* Repository's current hash algorithm, as serialized on disk. */
const struct git_hash_algo *hash_algo;
+ /* Repository's reference storage format, as serialized on disk. */
+ int ref_storage_format;
+
/* A unique-id for tracing purposes. */
int trace2_repo_id;
diff --git a/setup.c b/setup.c
index 155fe13f70..c1bf106379 100644
--- a/setup.c
+++ b/setup.c
@@ -1564,6 +1564,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
}
if (startup_info->have_repository) {
repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
+ the_repository->ref_storage_format =
+ repo_fmt.ref_storage_format;
the_repository->repository_format_worktree_config =
repo_fmt.worktree_config;
/* take ownership of repo_fmt.partial_clone */
@@ -1657,6 +1659,8 @@ void check_repository_format(struct repository_format *fmt)
check_repository_format_gently(get_git_dir(), fmt, NULL);
startup_info->have_repository = 1;
repo_set_hash_algo(the_repository, fmt->hash_algo);
+ the_repository->ref_storage_format =
+ fmt->ref_storage_format;
the_repository->repository_format_worktree_config =
fmt->worktree_config;
the_repository->repository_format_partial_clone =
@@ -1897,7 +1901,8 @@ static int is_reinit(void)
return ret;
}
-void create_reference_database(const char *initial_branch, int quiet)
+void create_reference_database(int ref_storage_format,
+ const char *initial_branch, int quiet)
{
struct strbuf err = STRBUF_INIT;
int reinit = is_reinit();
@@ -1917,6 +1922,7 @@ void create_reference_database(const char *initial_branch, int quiet)
safe_create_dir(git_path("refs"), 1);
adjust_shared_perm(git_path("refs"));
+ the_repository->ref_storage_format = ref_storage_format;
if (refs_init_db(&err))
die("failed to set up refs db: %s", err.buf);
@@ -2135,8 +2141,20 @@ static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash
}
}
+static void validate_ref_storage_format(struct repository_format *repo_fmt, int format)
+{
+ if (repo_fmt->version >= 0 &&
+ format != REF_STORAGE_FORMAT_UNKNOWN &&
+ format != repo_fmt->ref_storage_format) {
+ die(_("attempt to reinitialize repository with different reference storage format"));
+ } else if (format != REF_STORAGE_FORMAT_UNKNOWN) {
+ repo_fmt->ref_storage_format = format;
+ }
+}
+
int init_db(const char *git_dir, const char *real_git_dir,
- const char *template_dir, int hash, const char *initial_branch,
+ const char *template_dir, int hash,
+ int ref_storage_format, const char *initial_branch,
int init_shared_repository, unsigned int flags)
{
int reinit;
@@ -2179,13 +2197,15 @@ int init_db(const char *git_dir, const char *real_git_dir,
check_repository_format(&repo_fmt);
validate_hash_algorithm(&repo_fmt, hash);
+ validate_ref_storage_format(&repo_fmt, ref_storage_format);
reinit = create_default_files(template_dir, original_git_dir,
&repo_fmt, prev_bare_repository,
init_shared_repository);
if (!(flags & INIT_DB_SKIP_REFDB))
- create_reference_database(initial_branch, flags & INIT_DB_QUIET);
+ create_reference_database(repo_fmt.ref_storage_format,
+ initial_branch, flags & INIT_DB_QUIET);
create_object_directory();
if (get_shared_repository()) {
diff --git a/setup.h b/setup.h
index 3f0f17c351..4927abf2cf 100644
--- a/setup.h
+++ b/setup.h
@@ -115,6 +115,7 @@ struct repository_format {
int worktree_config;
int is_bare;
int hash_algo;
+ int ref_storage_format;
int sparse_index;
char *work_tree;
struct string_list unknown_extensions;
@@ -131,6 +132,7 @@ struct repository_format {
.version = -1, \
.is_bare = -1, \
.hash_algo = GIT_HASH_SHA1, \
+ .ref_storage_format = REF_STORAGE_FORMAT_FILES, \
.unknown_extensions = STRING_LIST_INIT_DUP, \
.v1_only_extensions = STRING_LIST_INIT_DUP, \
}
@@ -175,10 +177,12 @@ void check_repository_format(struct repository_format *fmt);
int init_db(const char *git_dir, const char *real_git_dir,
const char *template_dir, int hash_algo,
+ int ref_storage_format,
const char *initial_branch, int init_shared_repository,
unsigned int flags);
void initialize_repository_version(int hash_algo, int reinit);
-void create_reference_database(const char *initial_branch, int quiet);
+void create_reference_database(int ref_storage_format,
+ const char *initial_branch, int quiet);
/*
* NOTE NOTE NOTE!!
--
2.43.GIT
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