init-db.con commit Merge with gitk. (3f81fc8)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7
   8static 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
  18static int copy_file(const char *dst, const char *src, int mode)
  19{
  20        int fdi, fdo;
  21
  22        mode = (mode & 0111) ? 0777 : 0666;
  23        if ((fdi = open(src, O_RDONLY)) < 0)
  24                return fdi;
  25        if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  26                close(fdi);
  27                return fdo;
  28        }
  29        while (1) {
  30                char buf[BUFSIZ];
  31                ssize_t leni, leno, ofs;
  32                leni = read(fdi, buf, sizeof(buf));
  33                if (leni < 0) {
  34                error_return:
  35                        close(fdo);
  36                        close(fdi);
  37                        return -1;
  38                }
  39                if (!leni)
  40                        break;
  41                ofs = 0;
  42                do {
  43                        leno = write(fdo, buf+ofs, leni);
  44                        if (leno < 0)
  45                                goto error_return;
  46                        leni -= leno;
  47                        ofs += leno;
  48                } while (0 < leni);
  49        }
  50        close(fdo);
  51        close(fdi);
  52        return 0;
  53}
  54
  55static void copy_templates_1(char *path, int baselen,
  56                             char *template, int template_baselen,
  57                             DIR *dir)
  58{
  59        struct dirent *de;
  60
  61        /* Note: if ".git/hooks" file exists in the repository being
  62         * re-initialized, /etc/core-git/templates/hooks/update would
  63         * cause git-init-db to fail here.  I think this is sane but
  64         * it means that the set of templates we ship by default, along
  65         * with the way the namespace under .git/ is organized, should
  66         * be really carefully chosen.
  67         */
  68        safe_create_dir(path);
  69        while ((de = readdir(dir)) != NULL) {
  70                struct stat st_git, st_template;
  71                int namelen;
  72                int exists = 0;
  73
  74                if (de->d_name[0] == '.')
  75                        continue;
  76                namelen = strlen(de->d_name);
  77                if ((PATH_MAX <= baselen + namelen) ||
  78                    (PATH_MAX <= template_baselen + namelen))
  79                        die("insanely long template name %s", de->d_name);
  80                memcpy(path + baselen, de->d_name, namelen+1);
  81                memcpy(template + template_baselen, de->d_name, namelen+1);
  82                if (lstat(path, &st_git)) {
  83                        if (errno != ENOENT)
  84                                die("cannot stat %s", path);
  85                }
  86                else
  87                        exists = 1;
  88
  89                if (lstat(template, &st_template))
  90                        die("cannot stat template %s", template);
  91
  92                if (S_ISDIR(st_template.st_mode)) {
  93                        DIR *subdir = opendir(template);
  94                        int baselen_sub = baselen + namelen;
  95                        int template_baselen_sub = template_baselen + namelen;
  96                        if (!subdir)
  97                                die("cannot opendir %s", template);
  98                        path[baselen_sub++] =
  99                                template[template_baselen_sub++] = '/';
 100                        path[baselen_sub] =
 101                                template[template_baselen_sub] = 0;
 102                        copy_templates_1(path, baselen_sub,
 103                                         template, template_baselen_sub,
 104                                         subdir);
 105                        closedir(subdir);
 106                }
 107                else if (exists)
 108                        continue;
 109                else if (S_ISLNK(st_template.st_mode)) {
 110                        char lnk[256];
 111                        int len;
 112                        len = readlink(template, lnk, sizeof(lnk));
 113                        if (len < 0)
 114                                die("cannot readlink %s", template);
 115                        if (sizeof(lnk) <= len)
 116                                die("insanely long symlink %s", template);
 117                        lnk[len] = 0;
 118                        if (symlink(lnk, path))
 119                                die("cannot symlink %s %s", lnk, path);
 120                }
 121                else if (S_ISREG(st_template.st_mode)) {
 122                        if (copy_file(path, template, st_template.st_mode))
 123                                die("cannot copy %s to %s", template, path);
 124                }
 125                else
 126                        error("ignoring template %s", template);
 127        }
 128}
 129
 130static void copy_templates(const char *git_dir)
 131{
 132        char path[PATH_MAX];
 133        char template_path[PATH_MAX];
 134        char *template_dir;
 135        int len, template_len;
 136        DIR *dir;
 137
 138        strcpy(path, git_dir);
 139        len = strlen(path);
 140        template_dir = gitenv(TEMPLATE_DIR_ENVIRONMENT);
 141        if (!template_dir)
 142                template_dir = DEFAULT_GIT_TEMPLATE_ENVIRONMENT;
 143        strcpy(template_path, template_dir);
 144        template_len = strlen(template_path);
 145        if (template_path[template_len-1] != '/') {
 146                template_path[template_len++] = '/';
 147                template_path[template_len] = 0;
 148        }
 149
 150        dir = opendir(template_path);
 151        if (!dir)
 152                return;
 153        copy_templates_1(path, len,
 154                         template_path, template_len,
 155                         dir);
 156        closedir(dir);
 157}
 158
 159static void create_default_files(const char *git_dir)
 160{
 161        unsigned len = strlen(git_dir);
 162        static char path[PATH_MAX];
 163
 164        if (len > sizeof(path)-50)
 165                die("insane git directory %s", git_dir);
 166        memcpy(path, git_dir, len);
 167
 168        if (len && path[len-1] != '/')
 169                path[len++] = '/';
 170
 171        /*
 172         * Create .git/refs/{heads,tags}
 173         */
 174        strcpy(path + len, "refs");
 175        safe_create_dir(path);
 176        strcpy(path + len, "refs/heads");
 177        safe_create_dir(path);
 178        strcpy(path + len, "refs/tags");
 179        safe_create_dir(path);
 180
 181        /*
 182         * Create the default symlink from ".git/HEAD" to the "master"
 183         * branch
 184         */
 185        strcpy(path + len, "HEAD");
 186        if (symlink("refs/heads/master", path) < 0) {
 187                if (errno != EEXIST) {
 188                        perror(path);
 189                        exit(1);
 190                }
 191        }
 192        path[len] = 0;
 193        copy_templates(path);
 194}
 195
 196/*
 197 * If you want to, you can share the DB area with any number of branches.
 198 * That has advantages: you can save space by sharing all the SHA1 objects.
 199 * On the other hand, it might just make lookup slower and messier. You
 200 * be the judge.  The default case is to have one DB per managed directory.
 201 */
 202int main(int argc, char **argv)
 203{
 204        const char *git_dir;
 205        const char *sha1_dir;
 206        char *path;
 207        int len, i;
 208
 209        /*
 210         * Set up the default .git directory contents
 211         */
 212        git_dir = gitenv(GIT_DIR_ENVIRONMENT);
 213        if (!git_dir) {
 214                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 215                fprintf(stderr, "defaulting to local storage area\n");
 216        }
 217        safe_create_dir(git_dir);
 218        create_default_files(git_dir);
 219
 220        /*
 221         * And set up the object store.
 222         */
 223        sha1_dir = get_object_directory();
 224        len = strlen(sha1_dir);
 225        path = xmalloc(len + 40);
 226        memcpy(path, sha1_dir, len);
 227
 228        safe_create_dir(sha1_dir);
 229        for (i = 0; i < 256; i++) {
 230                sprintf(path+len, "/%02x", i);
 231                safe_create_dir(path);
 232        }
 233        strcpy(path+len, "/pack");
 234        safe_create_dir(path);
 235        return 0;
 236}