trace2: Documentation/technical/api-trace2.txt
[git/git.git] / repository.c
CommitLineData
f8adbec9
NTND
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
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BW
6#include "cache.h"
7#include "repository.h"
90c62155 8#include "object-store.h"
3b256228 9#include "config.h"
99bf115c 10#include "object.h"
3a95f31d 11#include "lockfile.h"
bf12fcdf 12#include "submodule-config.h"
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13
14/* The main repository */
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15static struct repository the_repo;
16struct repository *the_repository;
f8adbec9 17struct index_state the_index;
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18
19void initialize_the_repository(void)
20{
21 the_repository = &the_repo;
22
23 the_repo.index = &the_index;
90c62155 24 the_repo.objects = raw_object_store_new();
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25 the_repo.parsed_objects = parsed_object_pool_new();
26
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NTND
27 repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
28}
359efeff 29
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NTND
30static 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
40static void repo_set_commondir(struct repository *repo,
41 const char *commondir)
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42{
43 struct strbuf sb = STRBUF_INIT;
44
f9b7573f 45 free(repo->commondir);
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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);
359efeff 54 repo->commondir = strbuf_detach(&sb, NULL);
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55}
56
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NTND
57void repo_set_gitdir(struct repository *repo,
58 const char *root,
59 const struct set_gitdir_args *o)
359efeff 60{
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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 */
1fb2b636 67 char *old_gitdir = repo->gitdir;
359efeff 68
357a03eb 69 repo->gitdir = xstrdup(gitfile ? gitfile : root);
1fb2b636 70 free(old_gitdir);
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71
72 repo_set_commondir(repo, o->commondir);
f0eaf638
JK
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,
357a03eb 79 repo->commondir, "objects");
f0eaf638 80
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SB
81 free(repo->objects->alternate_db);
82 repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
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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");
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87}
88
78a67668 89void repo_set_hash_algo(struct repository *repo, int hash_algo)
90{
91 repo->hash_algo = &hash_algos[hash_algo];
92}
93
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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 */
98static 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;
357a03eb 104 struct set_gitdir_args args = { NULL };
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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
357a03eb 119 repo_set_gitdir(repo, resolved_gitdir, &args);
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120
121out:
122 free(abspath);
123 return ret;
124}
125
126void repo_set_worktree(struct repository *repo, const char *path)
127{
128 repo->worktree = real_pathdup(path, 1);
129}
130
131static int read_and_verify_repository_format(struct repository_format *format,
132 const char *commondir)
133{
134 int ret = 0;
135 struct strbuf sb = STRBUF_INIT;
136
137 strbuf_addf(&sb, "%s/config", commondir);
138 read_repository_format(format, sb.buf);
139 strbuf_reset(&sb);
140
141 if (verify_repository_format(format, &sb) < 0) {
142 warning("%s", sb.buf);
143 ret = -1;
144 }
145
146 strbuf_release(&sb);
147 return ret;
148}
149
150/*
151 * Initialize 'repo' based on the provided 'gitdir'.
152 * Return 0 upon success and a non-zero value upon failure.
153 */
da62f786
SB
154int repo_init(struct repository *repo,
155 const char *gitdir,
156 const char *worktree)
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157{
158 struct repository_format format;
159 memset(repo, 0, sizeof(*repo));
160
90c62155 161 repo->objects = raw_object_store_new();
99bf115c 162 repo->parsed_objects = parsed_object_pool_new();
90c62155 163
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164 if (repo_init_gitdir(repo, gitdir))
165 goto error;
166
167 if (read_and_verify_repository_format(&format, repo->commondir))
168 goto error;
169
78a67668 170 repo_set_hash_algo(repo, format.hash_algo);
171
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172 if (worktree)
173 repo_set_worktree(repo, worktree);
174
175 return 0;
176
177error:
178 repo_clear(repo);
179 return -1;
180}
181
d5498e08 182int repo_submodule_init(struct repository *subrepo,
96dc883b 183 struct repository *superproject,
d5498e08 184 const struct submodule *sub)
96dc883b 185{
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186 struct strbuf gitdir = STRBUF_INIT;
187 struct strbuf worktree = STRBUF_INIT;
188 int ret = 0;
189
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190 if (!sub) {
191 ret = -1;
192 goto out;
193 }
194
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SB
195 strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", sub->path);
196 strbuf_repo_worktree_path(&worktree, superproject, "%s", sub->path);
96dc883b 197
d5498e08 198 if (repo_init(subrepo, gitdir.buf, worktree.buf)) {
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199 /*
200 * If initilization fails then it may be due to the submodule
201 * not being populated in the superproject's worktree. Instead
202 * we can try to initilize the submodule by finding it's gitdir
203 * in the superproject's 'modules' directory. In this case the
204 * submodule would not have a worktree.
205 */
206 strbuf_reset(&gitdir);
207 strbuf_repo_git_path(&gitdir, superproject,
208 "modules/%s", sub->name);
209
d5498e08 210 if (repo_init(subrepo, gitdir.buf, NULL)) {
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211 ret = -1;
212 goto out;
213 }
214 }
215
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SB
216 subrepo->submodule_prefix = xstrfmt("%s%s/",
217 superproject->submodule_prefix ?
218 superproject->submodule_prefix :
219 "", sub->path);
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220
221out:
222 strbuf_release(&gitdir);
223 strbuf_release(&worktree);
224 return ret;
225}
226
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227void repo_clear(struct repository *repo)
228{
90dd04aa
RS
229 FREE_AND_NULL(repo->gitdir);
230 FREE_AND_NULL(repo->commondir);
90dd04aa
RS
231 FREE_AND_NULL(repo->graft_file);
232 FREE_AND_NULL(repo->index_file);
233 FREE_AND_NULL(repo->worktree);
234 FREE_AND_NULL(repo->submodule_prefix);
3b256228 235
90c62155
SB
236 raw_object_store_clear(repo->objects);
237 FREE_AND_NULL(repo->objects);
238
99bf115c
SB
239 parsed_object_pool_clear(repo->parsed_objects);
240 FREE_AND_NULL(repo->parsed_objects);
241
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BW
242 if (repo->config) {
243 git_configset_clear(repo->config);
90dd04aa 244 FREE_AND_NULL(repo->config);
3b256228 245 }
639e30b5 246
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BW
247 if (repo->submodule_cache) {
248 submodule_cache_free(repo->submodule_cache);
249 repo->submodule_cache = NULL;
250 }
251
639e30b5
BW
252 if (repo->index) {
253 discard_index(repo->index);
74373b5f
NTND
254 if (repo->index != &the_index)
255 FREE_AND_NULL(repo->index);
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BW
256 }
257}
258
259int repo_read_index(struct repository *repo)
260{
261 if (!repo->index)
262 repo->index = xcalloc(1, sizeof(*repo->index));
639e30b5 263
a125a223 264 return read_index_from(repo->index, repo->index_file, repo->gitdir);
359efeff 265}
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NTND
266
267int repo_hold_locked_index(struct repository *repo,
268 struct lock_file *lf,
269 int flags)
270{
271 if (!repo->index_file)
272 BUG("the repo hasn't been setup");
273 return hold_lock_file_for_update(lf, repo->index_file, flags);
274}