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, 0777) < 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         strcpy(path+len, "/pack");
  91         safe_create_dir(path);
  92         return 0;
  93 }