Andrew's git - gitweb.git/blob

   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7
   8#ifndef DEFAULT_GIT_TEMPLATE_DIR
   9#define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
  10#endif
  11
  12static void safe_create_dir(const char *dir)
  13{
  14        if (mkdir(dir, 0777) < 0) {
  15                if (errno != EEXIST) {
  16                        perror(dir);
  17                        exit(1);
  18                }
  19        }
  20}
  21
  22static int copy_file(const char *dst, const char *src, int mode)
  23{
  24        int fdi, fdo, status;
  25
  26        mode = (mode & 0111) ? 0777 : 0666;
  27        if ((fdi = open(src, O_RDONLY)) < 0)
  28                return fdi;
  29        if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  30                close(fdi);
  31                return fdo;
  32        }
  33        status = copy_fd(fdi, fdo);
  34        close(fdo);
  35        return status;
  36}
  37
  38static void copy_templates_1(char *path, int baselen,
  39                             char *template, int template_baselen,
  40                             DIR *dir)
  41{
  42        struct dirent *de;
  43
  44        /* Note: if ".git/hooks" file exists in the repository being
  45         * re-initialized, /etc/core-git/templates/hooks/update would
  46         * cause git-init-db to fail here.  I think this is sane but
  47         * it means that the set of templates we ship by default, along
  48         * with the way the namespace under .git/ is organized, should
  49         * be really carefully chosen.
  50         */
  51        safe_create_dir(path);
  52        while ((de = readdir(dir)) != NULL) {
  53                struct stat st_git, st_template;
  54                int namelen;
  55                int exists = 0;
  56
  57                if (de->d_name[0] == '.')
  58                        continue;
  59                namelen = strlen(de->d_name);
  60                if ((PATH_MAX <= baselen + namelen) ||
  61                    (PATH_MAX <= template_baselen + namelen))
  62                        die("insanely long template name %s", de->d_name);
  63                memcpy(path + baselen, de->d_name, namelen+1);
  64                memcpy(template + template_baselen, de->d_name, namelen+1);
  65                if (lstat(path, &st_git)) {
  66                        if (errno != ENOENT)
  67                                die("cannot stat %s", path);
  68                }
  69                else
  70                        exists = 1;
  71
  72                if (lstat(template, &st_template))
  73                        die("cannot stat template %s", template);
  74
  75                if (S_ISDIR(st_template.st_mode)) {
  76                        DIR *subdir = opendir(template);
  77                        int baselen_sub = baselen + namelen;
  78                        int template_baselen_sub = template_baselen + namelen;
  79                        if (!subdir)
  80                                die("cannot opendir %s", template);
  81                        path[baselen_sub++] =
  82                                template[template_baselen_sub++] = '/';
  83                        path[baselen_sub] =
  84                                template[template_baselen_sub] = 0;
  85                        copy_templates_1(path, baselen_sub,
  86                                         template, template_baselen_sub,
  87                                         subdir);
  88                        closedir(subdir);
  89                }
  90                else if (exists)
  91                        continue;
  92                else if (S_ISLNK(st_template.st_mode)) {
  93                        char lnk[256];
  94                        int len;
  95                        len = readlink(template, lnk, sizeof(lnk));
  96                        if (len < 0)
  97                                die("cannot readlink %s", template);
  98                        if (sizeof(lnk) <= len)
  99                                die("insanely long symlink %s", template);
 100                        lnk[len] = 0;
 101                        if (symlink(lnk, path))
 102                                die("cannot symlink %s %s", lnk, path);
 103                }
 104                else if (S_ISREG(st_template.st_mode)) {
 105                        if (copy_file(path, template, st_template.st_mode))
 106                                die("cannot copy %s to %s", template, path);
 107                }
 108                else
 109                        error("ignoring template %s", template);
 110        }
 111}
 112
 113static void copy_templates(const char *git_dir, int len, char *template_dir)
 114{
 115        char path[PATH_MAX];
 116        char template_path[PATH_MAX];
 117        int template_len;
 118        DIR *dir;
 119
 120        if (!template_dir)
 121                template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 122        strcpy(template_path, template_dir);
 123        template_len = strlen(template_path);
 124        if (template_path[template_len-1] != '/') {
 125                template_path[template_len++] = '/';
 126                template_path[template_len] = 0;
 127        }
 128        dir = opendir(template_path);
 129        if (!dir) {
 130                fprintf(stderr, "warning: templates not found %s\n",
 131                        template_dir);
 132                return;
 133        }
 134
 135        memcpy(path, git_dir, len);
 136        path[len] = 0;
 137        copy_templates_1(path, len,
 138                         template_path, template_len,
 139                         dir);
 140        closedir(dir);
 141}
 142
 143static void create_default_files(const char *git_dir,
 144                                 char *template_path)
 145{
 146        unsigned len = strlen(git_dir);
 147        static char path[PATH_MAX];
 148        unsigned char sha1[20];
 149
 150        if (len > sizeof(path)-50)
 151                die("insane git directory %s", git_dir);
 152        memcpy(path, git_dir, len);
 153
 154        if (len && path[len-1] != '/')
 155                path[len++] = '/';
 156
 157        /*
 158         * Create .git/refs/{heads,tags}
 159         */
 160        strcpy(path + len, "refs");
 161        safe_create_dir(path);
 162        strcpy(path + len, "refs/heads");
 163        safe_create_dir(path);
 164        strcpy(path + len, "refs/tags");
 165        safe_create_dir(path);
 166
 167        /*
 168         * Create the default symlink from ".git/HEAD" to the "master"
 169         * branch, if it does not exist yet.
 170         */
 171        strcpy(path + len, "HEAD");
 172        if (read_ref(path, sha1) < 0) {
 173                if (create_symref(path, "refs/heads/master") < 0)
 174                        exit(1);
 175        }
 176        path[len] = 0;
 177        copy_templates(path, len, template_path);
 178
 179        /*
 180         * Find out if we can trust the executable bit.
 181         */
 182        safe_create_dir(path);
 183        strcpy(path + len, "config");
 184        if (access(path, R_OK) < 0) {
 185                static const char contents[] =
 186                        "#\n"
 187                        "# This is the config file\n"
 188                        "#\n"
 189                        "\n"
 190                        "; core variables\n"
 191                        "[core]\n"
 192                        "       ; Don't trust file modes\n"
 193                        "       filemode = false\n"
 194                        "\n";
 195                FILE *config = fopen(path, "w");
 196                struct stat st;
 197
 198                if (!config)
 199                        die("Can not write to %s?", path);
 200
 201                fwrite(contents, sizeof(contents)-1, 1, config);
 202
 203                fclose(config);
 204
 205                if (!lstat(path, &st)) {
 206                        struct stat st2;
 207                        if (!chmod(path, st.st_mode ^ S_IXUSR) &&
 208                                        !lstat(path, &st2) &&
 209                                        st.st_mode != st2.st_mode)
 210                                unlink(path);
 211                        else
 212                                fprintf(stderr, "Ignoring file modes\n");
 213                }
 214        }
 215}
 216
 217static const char init_db_usage[] =
 218"git-init-db [--template=<template-directory>]";
 219
 220/*
 221 * If you want to, you can share the DB area with any number of branches.
 222 * That has advantages: you can save space by sharing all the SHA1 objects.
 223 * On the other hand, it might just make lookup slower and messier. You
 224 * be the judge.  The default case is to have one DB per managed directory.
 225 */
 226int main(int argc, char **argv)
 227{
 228        const char *git_dir;
 229        const char *sha1_dir;
 230        char *path, *template_dir = NULL;
 231        int len, i;
 232
 233        for (i = 1; i < argc; i++, argv++) {
 234                char *arg = argv[1];
 235                if (arg[0] != '-')
 236                        break;
 237                else if (!strncmp(arg, "--template=", 11))
 238                        template_dir = arg+11;
 239                else
 240                        die(init_db_usage);
 241        }
 242
 243        /*
 244         * Set up the default .git directory contents
 245         */
 246        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 247        if (!git_dir) {
 248                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 249                fprintf(stderr, "defaulting to local storage area\n");
 250        }
 251        safe_create_dir(git_dir);
 252        create_default_files(git_dir, template_dir);
 253
 254        /*
 255         * And set up the object store.
 256         */
 257        sha1_dir = get_object_directory();
 258        len = strlen(sha1_dir);
 259        path = xmalloc(len + 40);
 260        memcpy(path, sha1_dir, len);
 261
 262        safe_create_dir(sha1_dir);
 263        strcpy(path+len, "/pack");
 264        safe_create_dir(path);
 265        strcpy(path+len, "/info");
 266        safe_create_dir(path);
 267        return 0;
 268}