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| author | Neeraj Singh <neerajsi@microsoft.com> | 2021-12-06 23:05:05 +0100 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2021-12-08 23:06:46 +0100 |
| commit | ecd81dfc79cf12cc21fc0340da8ca8fcc5aa58a7 (patch) | |
| tree | c9e99733796f9a1004ddf6997075423716a4b202 | |
| parent | tmp-objdir: new API for creating temporary writable databases (diff) | |
| download | git-ecd81dfc79cf12cc21fc0340da8ca8fcc5aa58a7.tar.xz git-ecd81dfc79cf12cc21fc0340da8ca8fcc5aa58a7.zip | |
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>
| -rw-r--r-- | environment.c | 4 | ||||
| -rw-r--r-- | object-file.c | 6 | ||||
| -rw-r--r-- | object-store.h | 7 | ||||
| -rw-r--r-- | refs.c | 2 | ||||
| -rw-r--r-- | repository.c | 2 | ||||
| -rw-r--r-- | repository.h | 1 |
6 files changed, 21 insertions, 1 deletions
diff --git a/environment.c b/environment.c index e3a285a08f..d797f173b0 100644 --- a/environment.c +++ b/environment.c @@ -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); diff --git a/object-file.c b/object-file.c index 990381abee..f16441afb9 100644 --- a/object-file.c +++ b/object-file.c @@ -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; diff --git a/object-store.h b/object-store.h index 74b1b5872a..62a0c97f27 100644 --- a/object-store.h +++ b/object-store.h @@ -28,6 +28,13 @@ struct object_directory { 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. */ int will_destroy; @@ -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; diff --git a/repository.c b/repository.c index 710a3b4bf8..18e0526da0 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 3740c93bc0..77316367d9 100644 --- a/repository.h +++ b/repository.h @@ -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, |