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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 | #ifndef ENABLE_SHA256 | |
93 | if (hash_algo != GIT_HASH_SHA1) | |
94 | die(_("The hash algorithm %s is not supported in this build."), repo->hash_algo->name); | |
95 | #endif | |
96 | } | |
97 | ||
98 | /* | |
99 | * Attempt to resolve and set the provided 'gitdir' for repository 'repo'. | |
100 | * Return 0 upon success and a non-zero value upon failure. | |
101 | */ | |
102 | static int repo_init_gitdir(struct repository *repo, const char *gitdir) | |
103 | { | |
104 | int ret = 0; | |
105 | int error = 0; | |
106 | char *abspath = NULL; | |
107 | const char *resolved_gitdir; | |
108 | struct set_gitdir_args args = { NULL }; | |
109 | ||
110 | abspath = real_pathdup(gitdir, 0); | |
111 | if (!abspath) { | |
112 | ret = -1; | |
113 | goto out; | |
114 | } | |
115 | ||
116 | /* 'gitdir' must reference the gitdir directly */ | |
117 | resolved_gitdir = resolve_gitdir_gently(abspath, &error); | |
118 | if (!resolved_gitdir) { | |
119 | ret = -1; | |
120 | goto out; | |
121 | } | |
122 | ||
123 | repo_set_gitdir(repo, resolved_gitdir, &args); | |
124 | ||
125 | out: | |
126 | free(abspath); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | void repo_set_worktree(struct repository *repo, const char *path) | |
131 | { | |
132 | repo->worktree = real_pathdup(path, 1); | |
133 | ||
134 | trace2_def_repo(repo); | |
135 | } | |
136 | ||
137 | static int read_and_verify_repository_format(struct repository_format *format, | |
138 | const char *commondir) | |
139 | { | |
140 | int ret = 0; | |
141 | struct strbuf sb = STRBUF_INIT; | |
142 | ||
143 | strbuf_addf(&sb, "%s/config", commondir); | |
144 | read_repository_format(format, sb.buf); | |
145 | strbuf_reset(&sb); | |
146 | ||
147 | if (verify_repository_format(format, &sb) < 0) { | |
148 | warning("%s", sb.buf); | |
149 | ret = -1; | |
150 | } | |
151 | ||
152 | strbuf_release(&sb); | |
153 | return ret; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Initialize 'repo' based on the provided 'gitdir'. | |
158 | * Return 0 upon success and a non-zero value upon failure. | |
159 | */ | |
160 | int repo_init(struct repository *repo, | |
161 | const char *gitdir, | |
162 | const char *worktree) | |
163 | { | |
164 | struct repository_format format = REPOSITORY_FORMAT_INIT; | |
165 | memset(repo, 0, sizeof(*repo)); | |
166 | ||
167 | repo->objects = raw_object_store_new(); | |
168 | repo->parsed_objects = parsed_object_pool_new(); | |
169 | ||
170 | if (repo_init_gitdir(repo, gitdir)) | |
171 | goto error; | |
172 | ||
173 | if (read_and_verify_repository_format(&format, repo->commondir)) | |
174 | goto error; | |
175 | ||
176 | repo_set_hash_algo(repo, format.hash_algo); | |
177 | ||
178 | if (worktree) | |
179 | repo_set_worktree(repo, worktree); | |
180 | ||
181 | clear_repository_format(&format); | |
182 | return 0; | |
183 | ||
184 | error: | |
185 | repo_clear(repo); | |
186 | return -1; | |
187 | } | |
188 | ||
189 | int repo_submodule_init(struct repository *subrepo, | |
190 | struct repository *superproject, | |
191 | const struct submodule *sub) | |
192 | { | |
193 | struct strbuf gitdir = STRBUF_INIT; | |
194 | struct strbuf worktree = STRBUF_INIT; | |
195 | int ret = 0; | |
196 | ||
197 | if (!sub) { | |
198 | ret = -1; | |
199 | goto out; | |
200 | } | |
201 | ||
202 | strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path); | |
203 | strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path); | |
204 | ||
205 | if (repo_init(subrepo, gitdir.buf, worktree.buf)) { | |
206 | /* | |
207 | * If initialization fails then it may be due to the submodule | |
208 | * not being populated in the superproject's worktree. Instead | |
209 | * we can try to initialize the submodule by finding it's gitdir | |
210 | * in the superproject's 'modules' directory. In this case the | |
211 | * submodule would not have a worktree. | |
212 | */ | |
213 | strbuf_reset(&gitdir); | |
214 | strbuf_repo_git_path(&gitdir, superproject, | |
215 | "modules/%s", sub->name); | |
216 | ||
217 | if (repo_init(subrepo, gitdir.buf, NULL)) { | |
218 | ret = -1; | |
219 | goto out; | |
220 | } | |
221 | } | |
222 | ||
223 | subrepo->submodule_prefix = xstrfmt("%s%s/", | |
224 | superproject->submodule_prefix ? | |
225 | superproject->submodule_prefix : | |
226 | "", sub->path); | |
227 | ||
228 | out: | |
229 | strbuf_release(&gitdir); | |
230 | strbuf_release(&worktree); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | void repo_clear(struct repository *repo) | |
235 | { | |
236 | FREE_AND_NULL(repo->gitdir); | |
237 | FREE_AND_NULL(repo->commondir); | |
238 | FREE_AND_NULL(repo->graft_file); | |
239 | FREE_AND_NULL(repo->index_file); | |
240 | FREE_AND_NULL(repo->worktree); | |
241 | FREE_AND_NULL(repo->submodule_prefix); | |
242 | ||
243 | raw_object_store_clear(repo->objects); | |
244 | FREE_AND_NULL(repo->objects); | |
245 | ||
246 | parsed_object_pool_clear(repo->parsed_objects); | |
247 | FREE_AND_NULL(repo->parsed_objects); | |
248 | ||
249 | if (repo->config) { | |
250 | git_configset_clear(repo->config); | |
251 | FREE_AND_NULL(repo->config); | |
252 | } | |
253 | ||
254 | if (repo->submodule_cache) { | |
255 | submodule_cache_free(repo->submodule_cache); | |
256 | repo->submodule_cache = NULL; | |
257 | } | |
258 | ||
259 | if (repo->index) { | |
260 | discard_index(repo->index); | |
261 | if (repo->index != &the_index) | |
262 | FREE_AND_NULL(repo->index); | |
263 | } | |
264 | } | |
265 | ||
266 | int repo_read_index(struct repository *repo) | |
267 | { | |
268 | if (!repo->index) | |
269 | repo->index = xcalloc(1, sizeof(*repo->index)); | |
270 | ||
271 | return read_index_from(repo->index, repo->index_file, repo->gitdir); | |
272 | } | |
273 | ||
274 | int repo_hold_locked_index(struct repository *repo, | |
275 | struct lock_file *lf, | |
276 | int flags) | |
277 | { | |
278 | if (!repo->index_file) | |
279 | BUG("the repo hasn't been setup"); | |
280 | return hold_lock_file_for_update(lf, repo->index_file, flags); | |
281 | } |