4ffbe9bc94edc18314cb49c945038e2f20a40922
[git/git.git] / repository.c
1 #include "cache.h"
2 #include "repository.h"
3 #include "config.h"
4 #include "submodule-config.h"
5
6 /* The main repository */
7 static struct repository the_repo = {
8 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, &hash_algos[GIT_HASH_SHA1], 0, 0
9 };
10 struct repository *the_repository = &the_repo;
11
12 static char *git_path_from_env(const char *envvar, const char *git_dir,
13 const char *path, int fromenv)
14 {
15 if (fromenv) {
16 const char *value = getenv(envvar);
17 if (value)
18 return xstrdup(value);
19 }
20
21 return xstrfmt("%s/%s", git_dir, path);
22 }
23
24 static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
25 {
26 if (fromenv) {
27 const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
28 if (value) {
29 strbuf_addstr(sb, value);
30 return 1;
31 }
32 }
33
34 return get_common_dir_noenv(sb, gitdir);
35 }
36
37 static void repo_setup_env(struct repository *repo)
38 {
39 struct strbuf sb = STRBUF_INIT;
40
41 repo->different_commondir = find_common_dir(&sb, repo->gitdir,
42 !repo->ignore_env);
43 free(repo->commondir);
44 repo->commondir = strbuf_detach(&sb, NULL);
45 free(repo->objectdir);
46 repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir,
47 "objects", !repo->ignore_env);
48 free(repo->graft_file);
49 repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir,
50 "info/grafts", !repo->ignore_env);
51 free(repo->index_file);
52 repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir,
53 "index", !repo->ignore_env);
54 }
55
56 void repo_set_gitdir(struct repository *repo, const char *path)
57 {
58 const char *gitfile = read_gitfile(path);
59 char *old_gitdir = repo->gitdir;
60
61 repo->gitdir = xstrdup(gitfile ? gitfile : path);
62 repo_setup_env(repo);
63
64 free(old_gitdir);
65 }
66
67 void repo_set_hash_algo(struct repository *repo, int hash_algo)
68 {
69 repo->hash_algo = &hash_algos[hash_algo];
70 }
71
72 /*
73 * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
74 * Return 0 upon success and a non-zero value upon failure.
75 */
76 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
77 {
78 int ret = 0;
79 int error = 0;
80 char *abspath = NULL;
81 const char *resolved_gitdir;
82
83 abspath = real_pathdup(gitdir, 0);
84 if (!abspath) {
85 ret = -1;
86 goto out;
87 }
88
89 /* 'gitdir' must reference the gitdir directly */
90 resolved_gitdir = resolve_gitdir_gently(abspath, &error);
91 if (!resolved_gitdir) {
92 ret = -1;
93 goto out;
94 }
95
96 repo_set_gitdir(repo, resolved_gitdir);
97
98 out:
99 free(abspath);
100 return ret;
101 }
102
103 void repo_set_worktree(struct repository *repo, const char *path)
104 {
105 repo->worktree = real_pathdup(path, 1);
106 }
107
108 static int read_and_verify_repository_format(struct repository_format *format,
109 const char *commondir)
110 {
111 int ret = 0;
112 struct strbuf sb = STRBUF_INIT;
113
114 strbuf_addf(&sb, "%s/config", commondir);
115 read_repository_format(format, sb.buf);
116 strbuf_reset(&sb);
117
118 if (verify_repository_format(format, &sb) < 0) {
119 warning("%s", sb.buf);
120 ret = -1;
121 }
122
123 strbuf_release(&sb);
124 return ret;
125 }
126
127 /*
128 * Initialize 'repo' based on the provided 'gitdir'.
129 * Return 0 upon success and a non-zero value upon failure.
130 */
131 int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
132 {
133 struct repository_format format;
134 memset(repo, 0, sizeof(*repo));
135
136 repo->ignore_env = 1;
137
138 if (repo_init_gitdir(repo, gitdir))
139 goto error;
140
141 if (read_and_verify_repository_format(&format, repo->commondir))
142 goto error;
143
144 repo_set_hash_algo(repo, format.hash_algo);
145
146 if (worktree)
147 repo_set_worktree(repo, worktree);
148
149 return 0;
150
151 error:
152 repo_clear(repo);
153 return -1;
154 }
155
156 /*
157 * Initialize 'submodule' as the submodule given by 'path' in parent repository
158 * 'superproject'.
159 * Return 0 upon success and a non-zero value upon failure.
160 */
161 int repo_submodule_init(struct repository *submodule,
162 struct repository *superproject,
163 const char *path)
164 {
165 const struct submodule *sub;
166 struct strbuf gitdir = STRBUF_INIT;
167 struct strbuf worktree = STRBUF_INIT;
168 int ret = 0;
169
170 sub = submodule_from_cache(superproject, &null_oid, path);
171 if (!sub) {
172 ret = -1;
173 goto out;
174 }
175
176 strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
177 strbuf_repo_worktree_path(&worktree, superproject, "%s", path);
178
179 if (repo_init(submodule, gitdir.buf, worktree.buf)) {
180 /*
181 * If initilization fails then it may be due to the submodule
182 * not being populated in the superproject's worktree. Instead
183 * we can try to initilize the submodule by finding it's gitdir
184 * in the superproject's 'modules' directory. In this case the
185 * submodule would not have a worktree.
186 */
187 strbuf_reset(&gitdir);
188 strbuf_repo_git_path(&gitdir, superproject,
189 "modules/%s", sub->name);
190
191 if (repo_init(submodule, gitdir.buf, NULL)) {
192 ret = -1;
193 goto out;
194 }
195 }
196
197 submodule->submodule_prefix = xstrfmt("%s%s/",
198 superproject->submodule_prefix ?
199 superproject->submodule_prefix :
200 "", path);
201
202 out:
203 strbuf_release(&gitdir);
204 strbuf_release(&worktree);
205 return ret;
206 }
207
208 void repo_clear(struct repository *repo)
209 {
210 FREE_AND_NULL(repo->gitdir);
211 FREE_AND_NULL(repo->commondir);
212 FREE_AND_NULL(repo->objectdir);
213 FREE_AND_NULL(repo->graft_file);
214 FREE_AND_NULL(repo->index_file);
215 FREE_AND_NULL(repo->worktree);
216 FREE_AND_NULL(repo->submodule_prefix);
217
218 if (repo->config) {
219 git_configset_clear(repo->config);
220 FREE_AND_NULL(repo->config);
221 }
222
223 if (repo->submodule_cache) {
224 submodule_cache_free(repo->submodule_cache);
225 repo->submodule_cache = NULL;
226 }
227
228 if (repo->index) {
229 discard_index(repo->index);
230 FREE_AND_NULL(repo->index);
231 }
232 }
233
234 int repo_read_index(struct repository *repo)
235 {
236 if (!repo->index)
237 repo->index = xcalloc(1, sizeof(*repo->index));
238
239 return read_index_from(repo->index, repo->index_file, repo->gitdir);
240 }