repository: introduce the repository object
[git/git.git] / repository.c
CommitLineData
359efeff
BW
1#include "cache.h"
2#include "repository.h"
3
4/* The main repository */
5static struct repository the_repo;
6struct repository *the_repository = &the_repo;
7
8static char *git_path_from_env(const char *envvar, const char *git_dir,
9 const char *path, int fromenv)
10{
11 if (fromenv) {
12 const char *value = getenv(envvar);
13 if (value)
14 return xstrdup(value);
15 }
16
17 return xstrfmt("%s/%s", git_dir, path);
18}
19
20static int find_common_dir(struct strbuf *sb, const char *gitdir, int fromenv)
21{
22 if (fromenv) {
23 const char *value = getenv(GIT_COMMON_DIR_ENVIRONMENT);
24 if (value) {
25 strbuf_addstr(sb, value);
26 return 1;
27 }
28 }
29
30 return get_common_dir_noenv(sb, gitdir);
31}
32
33static void repo_setup_env(struct repository *repo)
34{
35 struct strbuf sb = STRBUF_INIT;
36
37 repo->different_commondir = find_common_dir(&sb, repo->gitdir,
38 !repo->ignore_env);
39 repo->commondir = strbuf_detach(&sb, NULL);
40 repo->objectdir = git_path_from_env(DB_ENVIRONMENT, repo->commondir,
41 "objects", !repo->ignore_env);
42 repo->graft_file = git_path_from_env(GRAFT_ENVIRONMENT, repo->commondir,
43 "info/grafts", !repo->ignore_env);
44 repo->index_file = git_path_from_env(INDEX_ENVIRONMENT, repo->gitdir,
45 "index", !repo->ignore_env);
46}
47
48void repo_set_gitdir(struct repository *repo, const char *path)
49{
50 const char *gitfile = read_gitfile(path);
51
52 /*
53 * NEEDSWORK: Eventually we want to be able to free gitdir and the rest
54 * of the environment before reinitializing it again, but we have some
55 * crazy code paths where we try to set gitdir with the current gitdir
56 * and we don't want to free gitdir before copying the passed in value.
57 */
58 repo->gitdir = xstrdup(gitfile ? gitfile : path);
59
60 repo_setup_env(repo);
61}
62
63/*
64 * Attempt to resolve and set the provided 'gitdir' for repository 'repo'.
65 * Return 0 upon success and a non-zero value upon failure.
66 */
67static int repo_init_gitdir(struct repository *repo, const char *gitdir)
68{
69 int ret = 0;
70 int error = 0;
71 char *abspath = NULL;
72 const char *resolved_gitdir;
73
74 abspath = real_pathdup(gitdir, 0);
75 if (!abspath) {
76 ret = -1;
77 goto out;
78 }
79
80 /* 'gitdir' must reference the gitdir directly */
81 resolved_gitdir = resolve_gitdir_gently(abspath, &error);
82 if (!resolved_gitdir) {
83 ret = -1;
84 goto out;
85 }
86
87 repo_set_gitdir(repo, resolved_gitdir);
88
89out:
90 free(abspath);
91 return ret;
92}
93
94void repo_set_worktree(struct repository *repo, const char *path)
95{
96 repo->worktree = real_pathdup(path, 1);
97}
98
99static int read_and_verify_repository_format(struct repository_format *format,
100 const char *commondir)
101{
102 int ret = 0;
103 struct strbuf sb = STRBUF_INIT;
104
105 strbuf_addf(&sb, "%s/config", commondir);
106 read_repository_format(format, sb.buf);
107 strbuf_reset(&sb);
108
109 if (verify_repository_format(format, &sb) < 0) {
110 warning("%s", sb.buf);
111 ret = -1;
112 }
113
114 strbuf_release(&sb);
115 return ret;
116}
117
118/*
119 * Initialize 'repo' based on the provided 'gitdir'.
120 * Return 0 upon success and a non-zero value upon failure.
121 */
122int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
123{
124 struct repository_format format;
125 memset(repo, 0, sizeof(*repo));
126
127 repo->ignore_env = 1;
128
129 if (repo_init_gitdir(repo, gitdir))
130 goto error;
131
132 if (read_and_verify_repository_format(&format, repo->commondir))
133 goto error;
134
135 if (worktree)
136 repo_set_worktree(repo, worktree);
137
138 return 0;
139
140error:
141 repo_clear(repo);
142 return -1;
143}
144
145void repo_clear(struct repository *repo)
146{
147 free(repo->gitdir);
148 repo->gitdir = NULL;
149 free(repo->commondir);
150 repo->commondir = NULL;
151 free(repo->objectdir);
152 repo->objectdir = NULL;
153 free(repo->graft_file);
154 repo->graft_file = NULL;
155 free(repo->index_file);
156 repo->index_file = NULL;
157 free(repo->worktree);
158 repo->worktree = NULL;
159}