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![brian m. carlson](/assets/img/avatar_default.png)
In future versions of Git, we plan to support an additional hash algorithm. Integrate the enumeration of hash algorithms with repository setup, and store a pointer to the enumerated data in struct repository. Of course, we currently only support SHA-1, so hard-code this value in read_repository_format. In the future, we'll enumerate this value from the configuration. Add a constant, the_hash_algo, which points to the hash_algo structure pointer in the repository global. Note that this is the hash which is used to serialize data to disk, not the hash which is used to display items to the user. The transition plan anticipates that these may be different. We can add an additional element in the future (say, ui_hash_algo) to provide for this case. Include repository.h in cache.h since we now need to have access to these struct and variable definitions. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
241 lines
5.6 KiB
C
241 lines
5.6 KiB
C
#include "cache.h"
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#include "repository.h"
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#include "config.h"
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#include "submodule-config.h"
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/* The main repository */
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static struct repository the_repo = {
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, 0, 0
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};
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struct repository *the_repository = &the_repo;
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static char *git_path_from_env(const char *envvar, const char *git_dir,
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const char *path, int fromenv)
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{
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if (fromenv) {
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const char *value = getenv(envvar);
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if (value)
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return xstrdup(value);
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}
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return xstrfmt("%s/%s", git_dir, path);
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}
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static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
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{
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if (fromenv) {
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const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
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if (value) {
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strbuf_addstr(sb, value);
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return 1;
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}
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}
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return get_common_dir_noenv(sb, gitdir);
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}
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static void repo_setup_env(struct repository *repo)
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{
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struct strbuf sb = STRBUF_INIT;
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repo->different_commondir = find_common_dir(&sb, repo->gitdir,
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!repo->ignore_env);
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free(repo->commondir);
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repo->commondir = strbuf_detach(&sb, NULL);
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free(repo->objectdir);
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repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir,
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"objects", !repo->ignore_env);
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free(repo->graft_file);
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repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir,
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"info/grafts", !repo->ignore_env);
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free(repo->index_file);
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repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir,
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"index", !repo->ignore_env);
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}
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void repo_set_gitdir(struct repository *repo, const char *path)
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{
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const char *gitfile = read_gitfile(path);
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char *old_gitdir = repo->gitdir;
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repo->gitdir = xstrdup(gitfile ? gitfile : path);
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repo_setup_env(repo);
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free(old_gitdir);
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}
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void repo_set_hash_algo(struct repository *repo, int hash_algo)
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{
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repo->hash_algo = &hash_algos[hash_algo];
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}
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/*
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* Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
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* Return 0 upon success and a non-zero value upon failure.
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*/
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static int repo_init_gitdir(struct repository *repo, const char *gitdir)
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{
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int ret = 0;
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int error = 0;
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char *abspath = NULL;
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const char *resolved_gitdir;
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abspath = real_pathdup(gitdir, 0);
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if (!abspath) {
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ret = -1;
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goto out;
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}
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/* 'gitdir' must reference the gitdir directly */
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resolved_gitdir = resolve_gitdir_gently(abspath, &error);
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if (!resolved_gitdir) {
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ret = -1;
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goto out;
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}
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repo_set_gitdir(repo, resolved_gitdir);
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out:
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free(abspath);
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return ret;
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}
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void repo_set_worktree(struct repository *repo, const char *path)
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{
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repo->worktree = real_pathdup(path, 1);
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}
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static int read_and_verify_repository_format(struct repository_format *format,
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const char *commondir)
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{
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int ret = 0;
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struct strbuf sb = STRBUF_INIT;
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strbuf_addf(&sb, "%s/config", commondir);
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read_repository_format(format, sb.buf);
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strbuf_reset(&sb);
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if (verify_repository_format(format, &sb) < 0) {
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warning("%s", sb.buf);
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ret = -1;
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}
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strbuf_release(&sb);
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return ret;
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}
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/*
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* Initialize 'repo' based on the provided 'gitdir'.
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* Return 0 upon success and a non-zero value upon failure.
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*/
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int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
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{
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struct repository_format format;
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memset(repo, 0, sizeof(*repo));
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repo->ignore_env = 1;
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if (repo_init_gitdir(repo, gitdir))
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goto error;
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if (read_and_verify_repository_format(&format, repo->commondir))
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goto error;
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repo_set_hash_algo(repo, format.hash_algo);
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if (worktree)
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repo_set_worktree(repo, worktree);
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return 0;
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error:
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repo_clear(repo);
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return -1;
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}
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/*
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* Initialize 'submodule' as the submodule given by 'path' in parent repository
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* 'superproject'.
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* Return 0 upon success and a non-zero value upon failure.
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*/
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int repo_submodule_init(struct repository *submodule,
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struct repository *superproject,
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const char *path)
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{
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const struct submodule *sub;
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struct strbuf gitdir = STRBUF_INIT;
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struct strbuf worktree = STRBUF_INIT;
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int ret = 0;
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sub = submodule_from_cache(superproject, &null_oid, path);
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if (!sub) {
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ret = -1;
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goto out;
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}
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strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
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strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
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if (repo_init(submodule, gitdir.buf, worktree.buf)) {
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/*
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* If initilization fails then it may be due to the submodule
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* not being populated in the superproject's worktree. Instead
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* we can try to initilize the submodule by finding it's gitdir
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* in the superproject's 'modules' directory. In this case the
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* submodule would not have a worktree.
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*/
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strbuf_reset(&gitdir);
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strbuf_repo_git_path(&gitdir, superproject,
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"modules/%s", sub->name);
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if (repo_init(submodule, gitdir.buf, NULL)) {
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ret = -1;
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goto out;
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}
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}
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submodule->submodule_prefix = xstrfmt("%s%s/",
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superproject->submodule_prefix ?
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superproject->submodule_prefix :
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"", path);
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out:
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strbuf_release(&gitdir);
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strbuf_release(&worktree);
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return ret;
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}
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void repo_clear(struct repository *repo)
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{
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FREE_AND_NULL(repo->gitdir);
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FREE_AND_NULL(repo->commondir);
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FREE_AND_NULL(repo->objectdir);
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FREE_AND_NULL(repo->graft_file);
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FREE_AND_NULL(repo->index_file);
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FREE_AND_NULL(repo->worktree);
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FREE_AND_NULL(repo->submodule_prefix);
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if (repo->config) {
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git_configset_clear(repo->config);
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FREE_AND_NULL(repo->config);
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}
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if (repo->submodule_cache) {
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submodule_cache_free(repo->submodule_cache);
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repo->submodule_cache = NULL;
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}
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if (repo->index) {
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discard_index(repo->index);
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FREE_AND_NULL(repo->index);
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}
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}
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int repo_read_index(struct repository *repo)
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{
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if (!repo->index)
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repo->index = xcalloc(1, sizeof(*repo->index));
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return read_index_from(repo->index, repo->index_file);
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}
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