Do a cross-project merge of Paul Mackerras' gitk visualizer
[git/git.git] / init-db.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
7
8 static void safe_create_dir(const char *dir)
9 {
10 if (mkdir(dir, 0755) < 0) {
11 if (errno != EEXIST) {
12 perror(dir);
13 exit(1);
14 }
15 }
16 }
17
18 static void create_default_files(const char *git_dir)
19 {
20 unsigned len = strlen(git_dir);
21 static char path[PATH_MAX];
22
23 if (len > sizeof(path)-50)
24 die("insane git directory %s", git_dir);
25 memcpy(path, git_dir, len);
26
27 if (len && path[len-1] != '/')
28 path[len++] = '/';
29
30 /*
31 * Create .git/refs/{heads,tags}
32 */
33 strcpy(path + len, "refs");
34 safe_create_dir(path);
35 strcpy(path + len, "refs/heads");
36 safe_create_dir(path);
37 strcpy(path + len, "refs/tags");
38 safe_create_dir(path);
39
40 /*
41 * Create the default symlink from ".git/HEAD" to the "master"
42 * branch
43 */
44 strcpy(path + len, "HEAD");
45 if (symlink("refs/heads/master", path) < 0) {
46 if (errno != EEXIST) {
47 perror(path);
48 exit(1);
49 }
50 }
51 }
52
53 /*
54 * If you want to, you can share the DB area with any number of branches.
55 * That has advantages: you can save space by sharing all the SHA1 objects.
56 * On the other hand, it might just make lookup slower and messier. You
57 * be the judge. The default case is to have one DB per managed directory.
58 */
59 int main(int argc, char **argv)
60 {
61 const char *git_dir;
62 const char *sha1_dir;
63 char *path;
64 int len, i;
65
66 /*
67 * Set up the default .git directory contents
68 */
69 git_dir = gitenv(GIT_DIR_ENVIRONMENT);
70 if (!git_dir) {
71 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
72 fprintf(stderr, "defaulting to local storage area\n");
73 }
74 safe_create_dir(git_dir);
75 create_default_files(git_dir);
76
77 /*
78 * And set up the object store.
79 */
80 sha1_dir = get_object_directory();
81 len = strlen(sha1_dir);
82 path = xmalloc(len + 40);
83 memcpy(path, sha1_dir, len);
84
85 safe_create_dir(sha1_dir);
86 for (i = 0; i < 256; i++) {
87 sprintf(path+len, "/%02x", i);
88 safe_create_dir(path);
89 }
90 return 0;
91 }