From: Neeraj Singh <neerajsi@xxxxxxxxxxxxx>
When creating a subprocess with a temporary ODB, we set the
GIT_QUARANTINE_ENVIRONMENT env var to tell child Git processes not
to update refs, since the tmp-objdir may go away.
Introduce a similar mechanism for in-process temporary ODBs when
we call tmp_objdir_replace_primary_odb. Now both mechanisms set
the disable_ref_updates flag on the odb, which is queried by
the ref_transaction_prepare function.
Note: This change adds an assumption that the state of
the_repository is relevant for any ref transaction that might
be initiated. Unwinding this assumption should be straightforward
by saving the relevant repository to query in the transaction or
the ref_store.
Peff's test case was invoking ref updates via the cachetextconv
setting. That particular code silently does nothing when a ref
update is forbidden. See the call to notes_cache_put in
fill_textconv where errors are ignored.
Reported-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Neeraj Singh <neerajsi@xxxxxxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
environment.c | 4 ++++
object-file.c | 6 ++++++
object-store.h | 7 +++++++
refs.c | 2 +-
repository.c | 2 ++
repository.h | 1 +
6 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/environment.c b/environment.c
index 342400fcaad..2701dfeeec8 100644
--- a/environment.c
+++ b/environment.c
@@ -169,6 +169,10 @@ void setup_git_env(const char *git_dir)
args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
+ if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
+ args.disable_ref_updates = 1;
+ }
+
repo_set_gitdir(the_repository, git_dir, &args);
strvec_clear(&to_free);
diff --git a/object-file.c b/object-file.c
index 0b6a61aeaff..659ef7623ff 100644
--- a/object-file.c
+++ b/object-file.c
@@ -699,6 +699,12 @@ struct object_directory *set_temporary_primary_odb(const char *dir, int will_des
*/
new_odb = xcalloc(1, sizeof(*new_odb));
new_odb->path = xstrdup(dir);
+
+ /*
+ * Disable ref updates while a temporary odb is active, since
+ * the objects in the database may roll back.
+ */
+ new_odb->disable_ref_updates = 1;
new_odb->will_destroy = will_destroy;
new_odb->next = the_repository->objects->odb;
the_repository->objects->odb = new_odb;
diff --git a/object-store.h b/object-store.h
index 82cf13f1054..9ae9262c340 100644
--- a/object-store.h
+++ b/object-store.h
@@ -27,6 +27,13 @@ struct object_directory {
uint32_t loose_objects_subdir_seen[8]; /* 256 bits */
struct oidtree *loose_objects_cache;
+ /*
+ * This is a temporary object store created by the tmp_objdir
+ * facility. Disable ref updates since the objects in the store
+ * might be discarded on rollback.
+ */
+ unsigned int disable_ref_updates : 1;
+
/*
* This object store is ephemeral, so there is no need to fsync.
*/
diff --git a/refs.c b/refs.c
index d7cc0a23a3b..ac744e85f5f 100644
--- a/refs.c
+++ b/refs.c
@@ -2137,7 +2137,7 @@ int ref_transaction_prepare(struct ref_transaction *transaction,
break;
}
- if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
+ if (refs->repo->objects->odb->disable_ref_updates) {
strbuf_addstr(err,
_("ref updates forbidden inside quarantine environment"));
return -1;
diff --git a/repository.c b/repository.c
index c5b90ba93ea..dce8e35ac20 100644
--- a/repository.c
+++ b/repository.c
@@ -80,6 +80,8 @@ void repo_set_gitdir(struct repository *repo,
expand_base_dir(&repo->objects->odb->path, o->object_dir,
repo->commondir, "objects");
+ repo->objects->odb->disable_ref_updates = o->disable_ref_updates;
+
free(repo->objects->alternate_db);
repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
expand_base_dir(&repo->graft_file, o->graft_file,
diff --git a/repository.h b/repository.h
index a057653981c..7c04e99ac5c 100644
--- a/repository.h
+++ b/repository.h
@@ -158,6 +158,7 @@ struct set_gitdir_args {
const char *graft_file;
const char *index_file;
const char *alternate_db;
+ int disable_ref_updates;
};
void repo_set_gitdir(struct repository *repo, const char *root,
--
gitgitgadget
