summaryrefslogtreecommitdiff
path: root/repository.c
blob: bb2fae5446b7ea8d2bfac87faa30c165f714d121 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
#include "cache.h"
#include "repository.h"
#include "config.h"
#include "submodule-config.h"

/* The main repository */
static struct repository the_repo = {
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, 0, 0
};
struct repository *the_repository = &the_repo;

static char *git_path_from_env(const char *envvar, const char *git_dir,
			       const char *path, int fromenv)
{
	if (fromenv) {
		const char *value = getenv(envvar);
		if (value)
			return xstrdup(value);
	}

	return xstrfmt("%s/%s", git_dir, path);
}

static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
{
	if (fromenv) {
		const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
		if (value) {
			strbuf_addstr(sb, value);
			return 1;
		}
	}

	return get_common_dir_noenv(sb, gitdir);
}

static void repo_setup_env(struct repository *repo)
{
	struct strbuf sb = STRBUF_INIT;

	repo->different_commondir = find_common_dir(&sb, repo->gitdir,
						    !repo->ignore_env);
	free(repo->commondir);
	repo->commondir = strbuf_detach(&sb, NULL);
	free(repo->objectdir);
	repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir,
					    "objects", !repo->ignore_env);
	free(repo->graft_file);
	repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir,
					     "info/grafts", !repo->ignore_env);
	free(repo->index_file);
	repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir,
					     "index", !repo->ignore_env);
}

void repo_set_gitdir(struct repository *repo, const char *path)
{
	const char *gitfile = read_gitfile(path);
	char *old_gitdir = repo->gitdir;

	repo->gitdir = xstrdup(gitfile ? gitfile : path);
	repo_setup_env(repo);

	free(old_gitdir);
}

/*
 * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
 * Return 0 upon success and a non-zero value upon failure.
 */
static int repo_init_gitdir(struct repository *repo, const char *gitdir)
{
	int ret = 0;
	int error = 0;
	char *abspath = NULL;
	const char *resolved_gitdir;

	abspath = real_pathdup(gitdir, 0);
	if (!abspath) {
		ret = -1;
		goto out;
	}

	/* 'gitdir' must reference the gitdir directly */
	resolved_gitdir = resolve_gitdir_gently(abspath, &error);
	if (!resolved_gitdir) {
		ret = -1;
		goto out;
	}

	repo_set_gitdir(repo, resolved_gitdir);

out:
	free(abspath);
	return ret;
}

void repo_set_worktree(struct repository *repo, const char *path)
{
	repo->worktree = real_pathdup(path, 1);
}

static int read_and_verify_repository_format(struct repository_format *format,
					     const char *commondir)
{
	int ret = 0;
	struct strbuf sb = STRBUF_INIT;

	strbuf_addf(&sb, "%s/config", commondir);
	read_repository_format(format, sb.buf);
	strbuf_reset(&sb);

	if (verify_repository_format(format, &sb) < 0) {
		warning("%s", sb.buf);
		ret = -1;
	}

	strbuf_release(&sb);
	return ret;
}

/*
 * Initialize 'repo' based on the provided 'gitdir'.
 * Return 0 upon success and a non-zero value upon failure.
 */
int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
{
	struct repository_format format;
	memset(repo, 0, sizeof(*repo));

	repo->ignore_env = 1;

	if (repo_init_gitdir(repo, gitdir))
		goto error;

	if (read_and_verify_repository_format(&format, repo->commondir))
		goto error;

	if (worktree)
		repo_set_worktree(repo, worktree);

	return 0;

error:
	repo_clear(repo);
	return -1;
}

/*
 * Initialize 'submodule' as the submodule given by 'path' in parent repository
 * 'superproject'.
 * Return 0 upon success and a non-zero value upon failure.
 */
int repo_submodule_init(struct repository *submodule,
			struct repository *superproject,
			const char *path)
{
	const struct submodule *sub;
	struct strbuf gitdir = STRBUF_INIT;
	struct strbuf worktree = STRBUF_INIT;
	int ret = 0;

	sub = submodule_from_cache(superproject, &null_oid, path);
	if (!sub) {
		ret = -1;
		goto out;
	}

	strbuf_repo_worktree_path(&gitdir, superproject, "%s/.git", path);
	strbuf_repo_worktree_path(&worktree, superproject, "%s", path);

	if (repo_init(submodule, gitdir.buf, worktree.buf)) {
		/*
		 * If initilization fails then it may be due to the submodule
		 * not being populated in the superproject's worktree.  Instead
		 * we can try to initilize the submodule by finding it's gitdir
		 * in the superproject's 'modules' directory.  In this case the
		 * submodule would not have a worktree.
		 */
		strbuf_reset(&gitdir);
		strbuf_repo_git_path(&gitdir, superproject,
				     "modules/%s", sub->name);

		if (repo_init(submodule, gitdir.buf, NULL)) {
			ret = -1;
			goto out;
		}
	}

	submodule->submodule_prefix = xstrfmt("%s%s/",
					      superproject->submodule_prefix ?
					      superproject->submodule_prefix :
					      "", path);

out:
	strbuf_release(&gitdir);
	strbuf_release(&worktree);
	return ret;
}

void repo_clear(struct repository *repo)
{
	FREE_AND_NULL(repo->gitdir);
	FREE_AND_NULL(repo->commondir);
	FREE_AND_NULL(repo->objectdir);
	FREE_AND_NULL(repo->graft_file);
	FREE_AND_NULL(repo->index_file);
	FREE_AND_NULL(repo->worktree);
	FREE_AND_NULL(repo->submodule_prefix);

	if (repo->config) {
		git_configset_clear(repo->config);
		FREE_AND_NULL(repo->config);
	}

	if (repo->submodule_cache) {
		submodule_cache_free(repo->submodule_cache);
		repo->submodule_cache = NULL;
	}

	if (repo->index) {
		discard_index(repo->index);
		FREE_AND_NULL(repo->index);
	}
}

int repo_read_index(struct repository *repo)
{
	if (!repo->index)
		repo->index = xcalloc(1, sizeof(*repo->index));

	return read_index_from(repo->index, repo->index_file);
}