Merge branch 'mh/notes-duplicate-entries'
[git/git.git] / repository.c
1 /*
2 * not really _using_ the compat macros, just make sure the_index
3 * declaration matches the definition in this file.
4 */
5 #define USE_THE_INDEX_COMPATIBILITY_MACROS
6 #include "cache.h"
7 #include "repository.h"
8 #include "object-store.h"
9 #include "config.h"
10 #include "object.h"
11 #include "lockfile.h"
12 #include "submodule-config.h"
13
14 /* The main repository */
15 static struct repository the_repo;
16 struct repository *the_repository;
17 struct index_state the_index;
18
19 void initialize_the_repository(void)
20 {
21 the_repository = &the_repo;
22
23 the_repo.index = &the_index;
24 the_repo.objects = raw_object_store_new();
25 the_repo.parsed_objects = parsed_object_pool_new();
26
27 repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
28 }
29
30 static void expand_base_dir(char **out, const char *in,
31 const char *base_dir, const char *def_in)
32 {
33 free(*out);
34 if (in)
35 *out = xstrdup(in);
36 else
37 *out = xstrfmt("%s/%s", base_dir, def_in);
38 }
39
40 static void repo_set_commondir(struct repository *repo,
41 const char *commondir)
42 {
43 struct strbuf sb = STRBUF_INIT;
44
45 free(repo->commondir);
46
47 if (commondir) {
48 repo->different_commondir = 1;
49 repo->commondir = xstrdup(commondir);
50 return;
51 }
52
53 repo->different_commondir = get_common_dir_noenv(&sb, repo->gitdir);
54 repo->commondir = strbuf_detach(&sb, NULL);
55 }
56
57 void repo_set_gitdir(struct repository *repo,
58 const char *root,
59 const struct set_gitdir_args *o)
60 {
61 const char *gitfile = read_gitfile(root);
62 /*
63 * repo->gitdir is saved because the caller could pass "root"
64 * that also points to repo->gitdir. We want to keep it alive
65 * until after xstrdup(root). Then we can free it.
66 */
67 char *old_gitdir = repo->gitdir;
68
69 repo->gitdir = xstrdup(gitfile ? gitfile : root);
70 free(old_gitdir);
71
72 repo_set_commondir(repo, o->commondir);
73
74 if (!repo->objects->odb) {
75 repo->objects->odb = xcalloc(1, sizeof(*repo->objects->odb));
76 repo->objects->odb_tail = &repo->objects->odb->next;
77 }
78 expand_base_dir(&repo->objects->odb->path, o->object_dir,
79 repo->commondir, "objects");
80
81 free(repo->objects->alternate_db);
82 repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
83 expand_base_dir(&repo->graft_file, o->graft_file,
84 repo->commondir, "info/grafts");
85 expand_base_dir(&repo->index_file, o->index_file,
86 repo->gitdir, "index");
87 }
88
89 void repo_set_hash_algo(struct repository *repo, int hash_algo)
90 {
91 repo->hash_algo = &hash_algos[hash_algo];
92 }
93
94 /*
95 * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
96 * Return 0 upon success and a non-zero value upon failure.
97 */
98 static int repo_init_gitdir(struct repository *repo, const char *gitdir)
99 {
100 int ret = 0;
101 int error = 0;
102 char *abspath = NULL;
103 const char *resolved_gitdir;
104 struct set_gitdir_args args = { NULL };
105
106 abspath = real_pathdup(gitdir, 0);
107 if (!abspath) {
108 ret = -1;
109 goto out;
110 }
111
112 /* 'gitdir' must reference the gitdir directly */
113 resolved_gitdir = resolve_gitdir_gently(abspath, &error);
114 if (!resolved_gitdir) {
115 ret = -1;
116 goto out;
117 }
118
119 repo_set_gitdir(repo, resolved_gitdir, &args);
120
121 out:
122 free(abspath);
123 return ret;
124 }
125
126 void repo_set_worktree(struct repository *repo, const char *path)
127 {
128 repo->worktree = real_pathdup(path, 1);
129
130 trace2_def_repo(repo);
131 }
132
133 static int read_and_verify_repository_format(struct repository_format *format,
134 const char *commondir)
135 {
136 int ret = 0;
137 struct strbuf sb = STRBUF_INIT;
138
139 strbuf_addf(&sb, "%s/config", commondir);
140 read_repository_format(format, sb.buf);
141 strbuf_reset(&sb);
142
143 if (verify_repository_format(format, &sb) < 0) {
144 warning("%s", sb.buf);
145 ret = -1;
146 }
147
148 strbuf_release(&sb);
149 return ret;
150 }
151
152 /*
153 * Initialize 'repo' based on the provided 'gitdir'.
154 * Return 0 upon success and a non-zero value upon failure.
155 */
156 int repo_init(struct repository *repo,
157 const char *gitdir,
158 const char *worktree)
159 {
160 struct repository_format format = REPOSITORY_FORMAT_INIT;
161 memset(repo, 0, sizeof(*repo));
162
163 repo->objects = raw_object_store_new();
164 repo->parsed_objects = parsed_object_pool_new();
165
166 if (repo_init_gitdir(repo, gitdir))
167 goto error;
168
169 if (read_and_verify_repository_format(&format, repo->commondir))
170 goto error;
171
172 repo_set_hash_algo(repo, format.hash_algo);
173
174 if (worktree)
175 repo_set_worktree(repo, worktree);
176
177 clear_repository_format(&format);
178 return 0;
179
180 error:
181 repo_clear(repo);
182 return -1;
183 }
184
185 int repo_submodule_init(struct repository *subrepo,
186 struct repository *superproject,
187 const struct submodule *sub)
188 {
189 struct strbuf gitdir = STRBUF_INIT;
190 struct strbuf worktree = STRBUF_INIT;
191 int ret = 0;
192
193 if (!sub) {
194 ret = -1;
195 goto out;
196 }
197
198 strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path);
199 strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path);
200
201 if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
202 /*
203 * If initilization fails then it may be due to the submodule
204 * not being populated in the superproject's worktree. Instead
205 * we can try to initilize the submodule by finding it's gitdir
206 * in the superproject's 'modules' directory. In this case the
207 * submodule would not have a worktree.
208 */
209 strbuf_reset(&gitdir);
210 strbuf_repo_git_path(&gitdir, superproject,
211 "modules/%s", sub->name);
212
213 if (repo_init(subrepo, gitdir.buf, NULL)) {
214 ret = -1;
215 goto out;
216 }
217 }
218
219 subrepo->submodule_prefix = xstrfmt("%s%s/",
220 superproject->submodule_prefix ?
221 superproject->submodule_prefix :
222 "", sub->path);
223
224 out:
225 strbuf_release(&gitdir);
226 strbuf_release(&worktree);
227 return ret;
228 }
229
230 void repo_clear(struct repository *repo)
231 {
232 FREE_AND_NULL(repo->gitdir);
233 FREE_AND_NULL(repo->commondir);
234 FREE_AND_NULL(repo->graft_file);
235 FREE_AND_NULL(repo->index_file);
236 FREE_AND_NULL(repo->worktree);
237 FREE_AND_NULL(repo->submodule_prefix);
238
239 raw_object_store_clear(repo->objects);
240 FREE_AND_NULL(repo->objects);
241
242 parsed_object_pool_clear(repo->parsed_objects);
243 FREE_AND_NULL(repo->parsed_objects);
244
245 if (repo->config) {
246 git_configset_clear(repo->config);
247 FREE_AND_NULL(repo->config);
248 }
249
250 if (repo->submodule_cache) {
251 submodule_cache_free(repo->submodule_cache);
252 repo->submodule_cache = NULL;
253 }
254
255 if (repo->index) {
256 discard_index(repo->index);
257 if (repo->index != &the_index)
258 FREE_AND_NULL(repo->index);
259 }
260 }
261
262 int repo_read_index(struct repository *repo)
263 {
264 if (!repo->index)
265 repo->index = xcalloc(1, sizeof(*repo->index));
266
267 return read_index_from(repo->index, repo->index_file, repo->gitdir);
268 }
269
270 int repo_hold_locked_index(struct repository *repo,
271 struct lock_file *lf,
272 int flags)
273 {
274 if (!repo->index_file)
275 BUG("the repo hasn't been setup");
276 return hold_lock_file_for_update(lf, repo->index_file, flags);
277 }