From 7d70b29c4f0b2fd3c6698956d9fb4026632d9c6e Mon Sep 17 00:00:00 2001 From: Patrick Steinhardt Date: Mon, 10 Mar 2025 08:13:31 +0100 Subject: hash: stop depending on `the_repository` in `null_oid()` The `null_oid()` function returns the object ID that only consists of zeroes. Naturally, this ID also depends on the hash algorithm used, as the number of zeroes is different between SHA1 and SHA256. Consequently, the function returns the hash-algorithm-specific null object ID. This is currently done by depending on `the_hash_algo`, which implicitly makes us depend on `the_repository`. Refactor the function to instead pass in the hash algorithm for which we want to retrieve the null object ID. Adapt callsites accordingly by passing in `the_repository`, thus bubbling up the dependency on that global variable by one layer. There are a couple of trivial exceptions for subsystems that already got rid of `the_repository`. These subsystems instead use the repository that is available via the calling context: - "builtin/grep.c" - "grep.c" - "refs/debug.c" There are also two non-trivial exceptions: - "diff-no-index.c": Here we know that we may not have a repository initialized at all, so we cannot rely on `the_repository`. Instead, we adapt `diff_no_index()` to get a `struct git_hash_algo` as parameter. The only caller is located in "builtin/diff.c", where we know to call `repo_set_hash_algo()` in case we're running outside of a Git repository. Consequently, it is fine to continue passing `the_repository->hash_algo` even in this case. - "builtin/ls-files.c": There is an in-flight patch series that drops `USE_THE_REPOSITORY_VARIABLE` in this file, which causes a semantic conflict because we use `null_oid()` in `show_submodule()`. The value is passed to `repo_submodule_init()`, which may use the object ID to resolve a tree-ish in the superproject from which we want to read the submodule config. As such, the object ID should refer to an object in the superproject, and consequently we need to use its hash algorithm. This means that we could in theory just not bother about this edge case at all and just use `the_repository` in "diff-no-index.c". But doing so would feel misdesigned. Remove the `USE_THE_REPOSITORY_VARIABLE` preprocessor define in "hash.c". Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano --- builtin/submodule--helper.c | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) (limited to 'builtin/submodule--helper.c') diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index c1a8029714..570226ea16 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -78,7 +78,7 @@ static int get_default_remote_submodule(const char *module_path, char **default_ int ret; if (repo_submodule_init(&subrepo, the_repository, module_path, - null_oid()) < 0) + null_oid(the_hash_algo)) < 0) return die_message(_("could not get a repository handle for submodule '%s'"), module_path); ret = repo_get_default_remote(&subrepo, default_remote); @@ -308,7 +308,7 @@ static void runcommand_in_submodule_cb(const struct cache_entry *list_item, displaypath = get_submodule_displaypath(path, info->prefix, info->super_prefix); - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (!sub) die(_("No url found for submodule path '%s' in .gitmodules"), @@ -468,7 +468,7 @@ static void init_submodule(const char *path, const char *prefix, displaypath = get_submodule_displaypath(path, prefix, super_prefix); - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (!sub) die(_("No url found for submodule path '%s' in .gitmodules"), @@ -645,14 +645,14 @@ static void status_submodule(const char *path, const struct object_id *ce_oid, if (validate_submodule_path(path) < 0) exit(128); - if (!submodule_from_path(the_repository, null_oid(), path)) + if (!submodule_from_path(the_repository, null_oid(the_hash_algo), path)) die(_("no submodule mapping found in .gitmodules for path '%s'"), path); displaypath = get_submodule_displaypath(path, prefix, super_prefix); if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) { - print_status(flags, 'U', path, null_oid(), displaypath); + print_status(flags, 'U', path, null_oid(the_hash_algo), displaypath); goto cleanup; } @@ -912,7 +912,7 @@ static void generate_submodule_summary(struct summary_cb *info, struct strbuf errmsg = STRBUF_INIT; int total_commits = -1; - if (!info->cached && oideq(&p->oid_dst, null_oid())) { + if (!info->cached && oideq(&p->oid_dst, null_oid(the_hash_algo))) { if (S_ISGITLINK(p->mod_dst)) { struct ref_store *refs = repo_get_submodule_ref_store(the_repository, p->sm_path); @@ -1051,7 +1051,7 @@ static void prepare_submodule_summary(struct summary_cb *info, if (info->for_status && p->status != 'A' && (sub = submodule_from_path(the_repository, - null_oid(), p->sm_path))) { + null_oid(the_hash_algo), p->sm_path))) { char *config_key = NULL; const char *value; int ignore_all = 0; @@ -1259,7 +1259,7 @@ static void sync_submodule(const char *path, const char *prefix, if (validate_submodule_path(path) < 0) exit(128); - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (sub && sub->url) { if (starts_with_dot_dot_slash(sub->url) || @@ -1404,7 +1404,7 @@ static void deinit_submodule(const char *path, const char *prefix, if (validate_submodule_path(path) < 0) exit(128); - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (!sub || !sub->name) goto cleanup; @@ -1929,7 +1929,7 @@ static int determine_submodule_update_strategy(struct repository *r, enum submodule_update_type update, struct submodule_update_strategy *out) { - const struct submodule *sub = submodule_from_path(r, null_oid(), path); + const struct submodule *sub = submodule_from_path(r, null_oid(the_hash_algo), path); char *key; const char *val; int ret; @@ -2089,7 +2089,7 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce, goto cleanup; } - sub = submodule_from_path(the_repository, null_oid(), ce->name); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), ce->name); if (!sub) { next_submodule_warn_missing(suc, out, displaypath); @@ -2485,7 +2485,7 @@ static int remote_submodule_branch(const char *path, const char **branch) char *key; *branch = NULL; - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (!sub) return die_message(_("could not initialize submodule at path '%s'"), path); @@ -2531,7 +2531,7 @@ static int ensure_core_worktree(const char *path) const char *cw; struct repository subrepo; - if (repo_submodule_init(&subrepo, the_repository, path, null_oid())) + if (repo_submodule_init(&subrepo, the_repository, path, null_oid(the_hash_algo))) return die_message(_("could not get a repository handle for submodule '%s'"), path); @@ -2644,7 +2644,7 @@ static int update_submodule(struct update_data *update_data) return ret; if (update_data->just_cloned) - oidcpy(&update_data->suboid, null_oid()); + oidcpy(&update_data->suboid, null_oid(the_hash_algo)); else if (repo_resolve_gitlink_ref(the_repository, update_data->sm_path, "HEAD", &update_data->suboid)) return die_message(_("Unable to find current revision in submodule path '%s'"), @@ -2697,8 +2697,8 @@ static int update_submodule(struct update_data *update_data) struct update_data next = *update_data; next.prefix = NULL; - oidcpy(&next.oid, null_oid()); - oidcpy(&next.suboid, null_oid()); + oidcpy(&next.oid, null_oid(the_hash_algo)); + oidcpy(&next.suboid, null_oid(the_hash_algo)); cp.dir = update_data->sm_path; cp.git_cmd = 1; @@ -3057,7 +3057,7 @@ static int module_set_url(int argc, const char **argv, const char *prefix, if (argc != 2 || !(path = argv[0]) || !(newurl = argv[1])) usage_with_options(usage, options); - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (!sub) die(_("no submodule mapping found in .gitmodules for path '%s'"), @@ -3113,7 +3113,7 @@ static int module_set_branch(int argc, const char **argv, const char *prefix, if (argc != 1 || !(path = argv[0])) usage_with_options(usage, options); - sub = submodule_from_path(the_repository, null_oid(), path); + sub = submodule_from_path(the_repository, null_oid(the_hash_algo), path); if (!sub) die(_("no submodule mapping found in .gitmodules for path '%s'"), -- cgit v1.3-5-g9baa