There are many ways for any command to access a git repository:
- most of them will try to discover the .git dir via
setup_git_directory() and friends
- the server side programs already know where the repo is and prepare
with enter_repo()
- special commands that deal with repo creation (init/clone) use
init_db() once the new repo is ready for access.
- somebody accesses $GIT_DIR before any of above functions are called
and accidentally sets up a git repository by set_git_dir() alone
"the_repository" is partially set up via set_git_dir() at some point
in all four cases. The hash algorithm though is configured later after
.git/config is read.
So far proper repo initialization is done only for the first case [1].
The second case is not covered (but that's fine [3]). The third case
was found and worked around in [2]. The fourth case is a buggy one,
which should be fixed already by jk/no-looking-at-dotgit-outside-repo
and never happens again.
This patch makes sure all cases initialize the hash algorithm in
the_repository correctly. Both second and third cases must run
check_repo_format() before "entering" it. Eventually we probably just
rename this function to init_repo() or something.
[1] 78a6766802 (Integrate hash algorithm support with repo setup -
2017-11-12)
[2] e26f7f19b6 (repository: pre-initialize hash algo pointer -
2018-01-19)
[3] the reason server side is still running ok with no hash algo
before [2] is because the programs that use enter_repo() do very
little then spawn a new program (like pack-objects or
upload-archive) to do the heavy lifting. These programs already
use setup_git_dir..()
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
builtin/init-db.c | 3 ++-
cache.h | 3 ++-
path.c | 2 +-
setup.c | 5 ++++-
4 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/builtin/init-db.c b/builtin/init-db.c
index c9b7946bad..d119d9906b 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -9,6 +9,7 @@
#include "builtin.h"
#include "exec_cmd.h"
#include "parse-options.h"
+#include "repository.h"
#ifndef DEFAULT_GIT_TEMPLATE_DIR
#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
@@ -369,7 +370,7 @@ int init_db(const char *git_dir, const char *real_git_dir,
* config file, so this will not fail. What we are catching
* is an attempt to reinitialize new repository with an old tool.
*/
- check_repository_format();
+ check_repository_format(the_repository);
reinit = create_default_files(template_dir, original_git_dir);
diff --git a/cache.h b/cache.h
index 21fbcc2414..6b97138264 100644
--- a/cache.h
+++ b/cache.h
@@ -894,6 +894,7 @@ extern int repository_format_precious_objects;
extern char *repository_format_partial_clone;
extern const char *core_partial_clone_filter_default;
+struct repository;
struct repository_format {
int version;
int precious_objects;
@@ -926,7 +927,7 @@ int verify_repository_format(const struct repository_format *format,
* set_git_dir() before calling this, and use it only for "are we in a valid
* repo?".
*/
-extern void check_repository_format(void);
+extern void check_repository_format(struct repository *);
#define MTIME_CHANGED 0x0001
#define CTIME_CHANGED 0x0002
diff --git a/path.c b/path.c
index da8b655730..a544252198 100644
--- a/path.c
+++ b/path.c
@@ -827,7 +827,7 @@ const char *enter_repo(const char *path, int strict)
if (is_git_directory(".")) {
set_git_dir(".");
- check_repository_format();
+ check_repository_format(the_repository);
return path;
}
diff --git a/setup.c b/setup.c
index c5d55dcee4..a82103832e 100644
--- a/setup.c
+++ b/setup.c
@@ -1180,11 +1180,14 @@ int git_config_perm(const char *var, const char *value)
return -(i & 0666);
}
-void check_repository_format(void)
+/* optionally configure "repo" to the correct format */
+void check_repository_format(struct repository *repo)
{
struct repository_format repo_fmt;
check_repository_format_gently(get_git_dir(), &repo_fmt, NULL);
startup_info->have_repository = 1;
+ if (repo)
+ repo_set_hash_algo(repo, repo_fmt.hash_algo);
}
/*
--
2.16.1.435.g8f24da2e1a
