Merge branch 'ag/sequencer-reduce-rewriting-todo' into pw/rebase-i-internal
[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;
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         return 0;
178
179 error:
180         repo_clear(repo);
181         return -1;
182 }
183
184 int repo_submodule_init(struct repository *subrepo,
185                         struct repository *superproject,
186                         const struct submodule *sub)
187 {
188         struct strbuf gitdir = STRBUF_INIT;
189         struct strbuf worktree = STRBUF_INIT;
190         int ret = 0;
191
192         if (!sub) {
193                 ret = -1;
194                 goto out;
195         }
196
197         strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path);
198         strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path);
199
200         if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
201                 /*
202                  * If initilization fails then it may be due to the submodule
203                  * not being populated in the superproject's worktree.  Instead
204                  * we can try to initilize the submodule by finding it's gitdir
205                  * in the superproject's 'modules' directory.  In this case the
206                  * submodule would not have a worktree.
207                  */
208                 strbuf_reset(&gitdir);
209                 strbuf_repo_git_path(&gitdir, superproject,
210                                      "modules/%s", sub->name);
211
212                 if (repo_init(subrepo, gitdir.buf, NULL)) {
213                         ret = -1;
214                         goto out;
215                 }
216         }
217
218         subrepo->submodule_prefix = xstrfmt("%s%s/",
219                                             superproject->submodule_prefix ?
220                                             superproject->submodule_prefix :
221                                             "", sub->path);
222
223 out:
224         strbuf_release(&gitdir);
225         strbuf_release(&worktree);
226         return ret;
227 }
228
229 void repo_clear(struct repository *repo)
230 {
231         FREE_AND_NULL(repo->gitdir);
232         FREE_AND_NULL(repo->commondir);
233         FREE_AND_NULL(repo->graft_file);
234         FREE_AND_NULL(repo->index_file);
235         FREE_AND_NULL(repo->worktree);
236         FREE_AND_NULL(repo->submodule_prefix);
237
238         raw_object_store_clear(repo->objects);
239         FREE_AND_NULL(repo->objects);
240
241         parsed_object_pool_clear(repo->parsed_objects);
242         FREE_AND_NULL(repo->parsed_objects);
243
244         if (repo->config) {
245                 git_configset_clear(repo->config);
246                 FREE_AND_NULL(repo->config);
247         }
248
249         if (repo->submodule_cache) {
250                 submodule_cache_free(repo->submodule_cache);
251                 repo->submodule_cache = NULL;
252         }
253
254         if (repo->index) {
255                 discard_index(repo->index);
256                 if (repo->index != &the_index)
257                         FREE_AND_NULL(repo->index);
258         }
259 }
260
261 int repo_read_index(struct repository *repo)
262 {
263         if (!repo->index)
264                 repo->index = xcalloc(1, sizeof(*repo->index));
265
266         return read_index_from(repo->index, repo->index_file, repo->gitdir);
267 }
268
269 int repo_hold_locked_index(struct repository *repo,
270                            struct lock_file *lf,
271                            int flags)
272 {
273         if (!repo->index_file)
274                 BUG("the repo hasn't been setup");
275         return hold_lock_file_for_update(lf, repo->index_file, flags);
276 }