Andrew's git / gitweb.git / init-db.c
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init-db.con commit git-commit --amend: allow empty commit. (8588452)
   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, int share)
  13{
  14        if (mkdir(dir, 0777) < 0) {
  15                if (errno != EEXIST) {
  16                        perror(dir);
  17                        exit(1);
  18                }
  19        }
  20        else if (share && adjust_shared_perm(dir))
  21                die("Could not make %s writable by group\n", dir);
  22}
  23
  24static int copy_file(const char *dst, const char *src, int mode)
  25{
  26        int fdi, fdo, status;
  27
  28        mode = (mode & 0111) ? 0777 : 0666;
  29        if ((fdi = open(src, O_RDONLY)) < 0)
  30                return fdi;
  31        if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  32                close(fdi);
  33                return fdo;
  34        }
  35        status = copy_fd(fdi, fdo);
  36        close(fdo);
  37
  38        if (!status && adjust_shared_perm(dst))
  39                return -1;
  40
  41        return status;
  42}
  43
  44static void copy_templates_1(char *path, int baselen,
  45                             char *template, int template_baselen,
  46                             DIR *dir)
  47{
  48        struct dirent *de;
  49
  50        /* Note: if ".git/hooks" file exists in the repository being
  51         * re-initialized, /etc/core-git/templates/hooks/update would
  52         * cause git-init-db to fail here.  I think this is sane but
  53         * it means that the set of templates we ship by default, along
  54         * with the way the namespace under .git/ is organized, should
  55         * be really carefully chosen.
  56         */
  57        safe_create_dir(path, 1);
  58        while ((de = readdir(dir)) != NULL) {
  59                struct stat st_git, st_template;
  60                int namelen;
  61                int exists = 0;
  62
  63                if (de->d_name[0] == '.')
  64                        continue;
  65                namelen = strlen(de->d_name);
  66                if ((PATH_MAX <= baselen + namelen) ||
  67                    (PATH_MAX <= template_baselen + namelen))
  68                        die("insanely long template name %s", de->d_name);
  69                memcpy(path + baselen, de->d_name, namelen+1);
  70                memcpy(template + template_baselen, de->d_name, namelen+1);
  71                if (lstat(path, &st_git)) {
  72                        if (errno != ENOENT)
  73                                die("cannot stat %s", path);
  74                }
  75                else
  76                        exists = 1;
  77
  78                if (lstat(template, &st_template))
  79                        die("cannot stat template %s", template);
  80
  81                if (S_ISDIR(st_template.st_mode)) {
  82                        DIR *subdir = opendir(template);
  83                        int baselen_sub = baselen + namelen;
  84                        int template_baselen_sub = template_baselen + namelen;
  85                        if (!subdir)
  86                                die("cannot opendir %s", template);
  87                        path[baselen_sub++] =
  88                                template[template_baselen_sub++] = '/';
  89                        path[baselen_sub] =
  90                                template[template_baselen_sub] = 0;
  91                        copy_templates_1(path, baselen_sub,
  92                                         template, template_baselen_sub,
  93                                         subdir);
  94                        closedir(subdir);
  95                }
  96                else if (exists)
  97                        continue;
  98                else if (S_ISLNK(st_template.st_mode)) {
  99                        char lnk[256];
 100                        int len;
 101                        len = readlink(template, lnk, sizeof(lnk));
 102                        if (len < 0)
 103                                die("cannot readlink %s", template);
 104                        if (sizeof(lnk) <= len)
 105                                die("insanely long symlink %s", template);
 106                        lnk[len] = 0;
 107                        if (symlink(lnk, path))
 108                                die("cannot symlink %s %s", lnk, path);
 109                }
 110                else if (S_ISREG(st_template.st_mode)) {
 111                        if (copy_file(path, template, st_template.st_mode))
 112                                die("cannot copy %s to %s", template, path);
 113                }
 114                else
 115                        error("ignoring template %s", template);
 116        }
 117}
 118
 119static void copy_templates(const char *git_dir, int len, char *template_dir)
 120{
 121        char path[PATH_MAX];
 122        char template_path[PATH_MAX];
 123        int template_len;
 124        DIR *dir;
 125
 126        if (!template_dir)
 127                template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 128        strcpy(template_path, template_dir);
 129        template_len = strlen(template_path);
 130        if (template_path[template_len-1] != '/') {
 131                template_path[template_len++] = '/';
 132                template_path[template_len] = 0;
 133        }
 134        dir = opendir(template_path);
 135        if (!dir) {
 136                fprintf(stderr, "warning: templates not found %s\n",
 137                        template_dir);
 138                return;
 139        }
 140
 141        /* Make sure that template is from the correct vintage */
 142        strcpy(template_path + template_len, "config");
 143        repository_format_version = 0;
 144        git_config_from_file(check_repository_format_version,
 145                             template_path);
 146        template_path[template_len] = 0;
 147
 148        if (repository_format_version &&
 149            repository_format_version != GIT_REPO_VERSION) {
 150                fprintf(stderr, "warning: not copying templates of "
 151                        "a wrong format version %d from '%s'\n",
 152                        repository_format_version,
 153                        template_dir);
 154                closedir(dir);
 155                return;
 156        }
 157
 158        memcpy(path, git_dir, len);
 159        path[len] = 0;
 160        copy_templates_1(path, len,
 161                         template_path, template_len,
 162                         dir);
 163        closedir(dir);
 164}
 165
 166static void create_default_files(const char *git_dir, char *template_path)
 167{
 168        unsigned len = strlen(git_dir);
 169        static char path[PATH_MAX];
 170        unsigned char sha1[20];
 171        struct stat st1;
 172        char repo_version_string[10];
 173
 174        if (len > sizeof(path)-50)
 175                die("insane git directory %s", git_dir);
 176        memcpy(path, git_dir, len);
 177
 178        if (len && path[len-1] != '/')
 179                path[len++] = '/';
 180
 181        /*
 182         * Create .git/refs/{heads,tags}
 183         */
 184        strcpy(path + len, "refs");
 185        safe_create_dir(path, 1);
 186        strcpy(path + len, "refs/heads");
 187        safe_create_dir(path, 1);
 188        strcpy(path + len, "refs/tags");
 189        safe_create_dir(path, 1);
 190
 191        /* First copy the templates -- we might have the default
 192         * config file there, in which case we would want to read
 193         * from it after installing.
 194         */
 195        path[len] = 0;
 196        copy_templates(path, len, template_path);
 197
 198        git_config(git_default_config);
 199
 200        /*
 201         * Create the default symlink from ".git/HEAD" to the "master"
 202         * branch, if it does not exist yet.
 203         */
 204        strcpy(path + len, "HEAD");
 205        if (read_ref(path, sha1) < 0) {
 206                if (create_symref(path, "refs/heads/master") < 0)
 207                        exit(1);
 208        }
 209
 210        /* This forces creation of new config file */
 211        sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 212        git_config_set("core.repositoryformatversion", repo_version_string);
 213
 214        path[len] = 0;
 215        strcpy(path + len, "config");
 216
 217        /* Check filemode trustability */
 218        if (!lstat(path, &st1)) {
 219                struct stat st2;
 220                int filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 221                                !lstat(path, &st2) &&
 222                                st1.st_mode != st2.st_mode);
 223                git_config_set("core.filemode",
 224                               filemode ? "true" : "false");
 225        }
 226}
 227
 228static const char init_db_usage[] =
 229"git-init-db [--template=<template-directory>] [--shared]";
 230
 231/*
 232 * If you want to, you can share the DB area with any number of branches.
 233 * That has advantages: you can save space by sharing all the SHA1 objects.
 234 * On the other hand, it might just make lookup slower and messier. You
 235 * be the judge.  The default case is to have one DB per managed directory.
 236 */
 237int main(int argc, char **argv)
 238{
 239        const char *git_dir;
 240        const char *sha1_dir;
 241        char *path, *template_dir = NULL;
 242        int len, i;
 243
 244        for (i = 1; i < argc; i++, argv++) {
 245                char *arg = argv[1];
 246                if (!strncmp(arg, "--template=", 11))
 247                        template_dir = arg+11;
 248                else if (!strcmp(arg, "--shared"))
 249                        shared_repository = 1;
 250                else
 251                        die(init_db_usage);
 252        }
 253
 254        /*
 255         * Set up the default .git directory contents
 256         */
 257        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 258        if (!git_dir) {
 259                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 260                fprintf(stderr, "defaulting to local storage area\n");
 261        }
 262        safe_create_dir(git_dir, 0);
 263
 264        /* Check to see if the repository version is right.
 265         * Note that a newly created repository does not have
 266         * config file, so this will not fail.  What we are catching
 267         * is an attempt to reinitialize new repository with an old tool.
 268         */
 269        check_repository_format();
 270
 271        create_default_files(git_dir, template_dir);
 272
 273        /*
 274         * And set up the object store.
 275         */
 276        sha1_dir = get_object_directory();
 277        len = strlen(sha1_dir);
 278        path = xmalloc(len + 40);
 279        memcpy(path, sha1_dir, len);
 280
 281        safe_create_dir(sha1_dir, 1);
 282        strcpy(path+len, "/pack");
 283        safe_create_dir(path, 1);
 284        strcpy(path+len, "/info");
 285        safe_create_dir(path, 1);
 286
 287        if (shared_repository)
 288                git_config_set("core.sharedRepository", "true");
 289
 290        return 0;
 291}