diff options
Diffstat (limited to 'repository.c')
| -rw-r--r-- | repository.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/repository.c b/repository.c new file mode 100644 index 0000000000..4ffbe9bc94 --- /dev/null +++ b/repository.c @@ -0,0 +1,240 @@ +#include "cache.h" +#include "repository.h" +#include "config.h" +#include "submodule-config.h" + +/* The main repository */ +static struct repository the_repo = { + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, &hash_algos[GIT_HASH_SHA1], 0, 0 +}; +struct repository *the_repository = &the_repo; + +static char *git_path_from_env(const char *envvar, const char *git_dir, + const char *path, int fromenv) +{ + if (fromenv) { + const char *value = getenv(envvar); + if (value) + return xstrdup(value); + } + + return xstrfmt("%s/%s", git_dir, path); +} + +static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv) +{ + if (fromenv) { + const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT); + if (value) { + strbuf_addstr(sb, value); + return 1; + } + } + + return get_common_dir_noenv(sb, gitdir); +} + +static void repo_setup_env(struct repository *repo) +{ + struct strbuf sb = STRBUF_INIT; + + repo->different_commondir = find_common_dir(&sb, repo->gitdir, + !repo->ignore_env); + free(repo->commondir); + repo->commondir = strbuf_detach(&sb, NULL); + free(repo->objectdir); + repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir, + "objects", !repo->ignore_env); + free(repo->graft_file); + repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir, + "info/grafts", !repo->ignore_env); + free(repo->index_file); + repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir, + "index", !repo->ignore_env); +} + +void repo_set_gitdir(struct repository *repo, const char *path) +{ + const char *gitfile = read_gitfile(path); + char *old_gitdir = repo->gitdir; + + repo->gitdir = xstrdup(gitfile ? gitfile : path); + repo_setup_env(repo); + + free(old_gitdir); +} + +void repo_set_hash_algo(struct repository *repo, int hash_algo) +{ + repo->hash_algo = &hash_algos[hash_algo]; +} + +/* + * Attempt to resolve and set the provided 'gitdir' for repository 'repo'. + * Return 0 upon success and a non-zero value upon failure. + */ +static int repo_init_gitdir(struct repository *repo, const char *gitdir) +{ + int ret = 0; + int error = 0; + char *abspath = NULL; + const char *resolved_gitdir; + + abspath = real_pathdup(gitdir, 0); + if (!abspath) { + ret = -1; + goto out; + } + + /* 'gitdir' must reference the gitdir directly */ + resolved_gitdir = resolve_gitdir_gently(abspath, &error); + if (!resolved_gitdir) { + ret = -1; + goto out; + } + + repo_set_gitdir(repo, resolved_gitdir); + +out: + free(abspath); + return ret; +} + +void repo_set_worktree(struct repository *repo, const char *path) +{ + repo->worktree = real_pathdup(path, 1); +} + +static int read_and_verify_repository_format(struct repository_format *format, + const char *commondir) +{ + int ret = 0; + struct strbuf sb = STRBUF_INIT; + + strbuf_addf(&sb, "%s/config", commondir); + read_repository_format(format, sb.buf); + strbuf_reset(&sb); + + if (verify_repository_format(format, &sb) < 0) { + warning("%s", sb.buf); + ret = -1; + } + + strbuf_release(&sb); + return ret; +} + +/* + * Initialize 'repo' based on the provided 'gitdir'. + * Return 0 upon success and a non-zero value upon failure. + */ +int repo_init(struct repository *repo, const char *gitdir, const char *worktree) +{ + struct repository_format format; + memset(repo, 0, sizeof(*repo)); + + repo->ignore_env = 1; + + if (repo_init_gitdir(repo, gitdir)) + goto error; + + if (read_and_verify_repository_format(&format, repo->commondir)) + goto error; + + repo_set_hash_algo(repo, format.hash_algo); + + if (worktree) + repo_set_worktree(repo, worktree); + + return 0; + +error: + repo_clear(repo); + return -1; +} + +/* + * Initialize 'submodule' as the submodule given by 'path' in parent repository + * 'superproject'. + * Return 0 upon success and a non-zero value upon failure. + */ +int repo_submodule_init(struct repository *submodule, + struct repository *superproject, + const char *path) +{ + const struct submodule *sub; + struct strbuf gitdir = STRBUF_INIT; + struct strbuf worktree = STRBUF_INIT; + int ret = 0; + + sub = submodule_from_cache(superproject, &null_oid, path); + if (!sub) { + ret = -1; + goto out; + } + + strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path); + strbuf_repo_worktree_path(&worktree, superproject, "%s", path); + + if (repo_init(submodule, gitdir.buf, worktree.buf)) { + /* + * If initilization fails then it may be due to the submodule + * not being populated in the superproject's worktree. Instead + * we can try to initilize the submodule by finding it's gitdir + * in the superproject's 'modules' directory. In this case the + * submodule would not have a worktree. + */ + strbuf_reset(&gitdir); + strbuf_repo_git_path(&gitdir, superproject, + "modules/%s", sub->name); + + if (repo_init(submodule, gitdir.buf, NULL)) { + ret = -1; + goto out; + } + } + + submodule->submodule_prefix = xstrfmt("%s%s/", + superproject->submodule_prefix ? + superproject->submodule_prefix : + "", path); + +out: + strbuf_release(&gitdir); + strbuf_release(&worktree); + return ret; +} + +void repo_clear(struct repository *repo) +{ + FREE_AND_NULL(repo->gitdir); + FREE_AND_NULL(repo->commondir); + FREE_AND_NULL(repo->objectdir); + FREE_AND_NULL(repo->graft_file); + FREE_AND_NULL(repo->index_file); + FREE_AND_NULL(repo->worktree); + FREE_AND_NULL(repo->submodule_prefix); + + if (repo->config) { + git_configset_clear(repo->config); + FREE_AND_NULL(repo->config); + } + + if (repo->submodule_cache) { + submodule_cache_free(repo->submodule_cache); + repo->submodule_cache = NULL; + } + + if (repo->index) { + discard_index(repo->index); + FREE_AND_NULL(repo->index); + } +} + +int repo_read_index(struct repository *repo) +{ + if (!repo->index) + repo->index = xcalloc(1, sizeof(*repo->index)); + + return read_index_from(repo->index, repo->index_file, repo->gitdir); +} |