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tmp-objdir: disable ref updates when replacing the primary odb 

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.

Peff's test case [1] 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.

[1] https://lore.kernel.org/git/YVOn3hDsb5pnxR53@coredump.intra.peff.net/

Reported-by: Jeff King <peff@peff.net>
Signed-off-by: Neeraj Singh <neerajsi@microsoft.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Neeraj Singh 2021-12-06 22:05:05 +00:00 committed by Junio C Hamano
parent b3cecf49ea
commit ecd81dfc79
6 changed files with 21 additions and 1 deletions
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4
environment.c
View File

@ -177,6 +177,10 @@ 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);

6
object-file.c
View File

@ -767,6 +767,12 @@ 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;

7
object-store.h
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@ -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.
*/
int disable_ref_updates;
/*
* This object store is ephemeral, so there is no need to fsync.
*/

2
refs.c
View File

@ -2126,7 +2126,7 @@ 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;

2
repository.c
View File

@ -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,

1
repository.h
View File

@ -162,6 +162,7 @@ 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,