Andrew's git / gitweb.git / setup.c
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setup.con commit more D/F conflict tests (934f930)
   1#include "cache.h"
   2#include "dir.h"
   3
   4static int inside_git_dir = -1;
   5static int inside_work_tree = -1;
   6
   7const char *prefix_path(const char *prefix, int len, const char *path)
   8{
   9        const char *orig = path;
  10        char *sanitized = xmalloc(len + strlen(path) + 1);
  11        if (is_absolute_path(orig))
  12                strcpy(sanitized, path);
  13        else {
  14                if (len)
  15                        memcpy(sanitized, prefix, len);
  16                strcpy(sanitized + len, path);
  17        }
  18        if (normalize_path_copy(sanitized, sanitized))
  19                goto error_out;
  20        if (is_absolute_path(orig)) {
  21                size_t len, total;
  22                const char *work_tree = get_git_work_tree();
  23                if (!work_tree)
  24                        goto error_out;
  25                len = strlen(work_tree);
  26                total = strlen(sanitized) + 1;
  27                if (strncmp(sanitized, work_tree, len) ||
  28                    (sanitized[len] != '\0' && sanitized[len] != '/')) {
  29                error_out:
  30                        die("'%s' is outside repository", orig);
  31                }
  32                if (sanitized[len] == '/')
  33                        len++;
  34                memmove(sanitized, sanitized + len, total - len);
  35        }
  36        return sanitized;
  37}
  38
  39/*
  40 * Unlike prefix_path, this should be used if the named file does
  41 * not have to interact with index entry; i.e. name of a random file
  42 * on the filesystem.
  43 */
  44const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
  45{
  46        static char path[PATH_MAX];
  47#ifndef WIN32
  48        if (!pfx || !*pfx || is_absolute_path(arg))
  49                return arg;
  50        memcpy(path, pfx, pfx_len);
  51        strcpy(path + pfx_len, arg);
  52#else
  53        char *p;
  54        /* don't add prefix to absolute paths, but still replace '\' by '/' */
  55        if (is_absolute_path(arg))
  56                pfx_len = 0;
  57        else
  58                memcpy(path, pfx, pfx_len);
  59        strcpy(path + pfx_len, arg);
  60        for (p = path + pfx_len; *p; p++)
  61                if (*p == '\\')
  62                        *p = '/';
  63#endif
  64        return path;
  65}
  66
  67int check_filename(const char *prefix, const char *arg)
  68{
  69        const char *name;
  70        struct stat st;
  71
  72        name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
  73        if (!lstat(name, &st))
  74                return 1; /* file exists */
  75        if (errno == ENOENT || errno == ENOTDIR)
  76                return 0; /* file does not exist */
  77        die_errno("failed to stat '%s'", arg);
  78}
  79
  80/*
  81 * Verify a filename that we got as an argument for a pathspec
  82 * entry. Note that a filename that begins with "-" never verifies
  83 * as true, because even if such a filename were to exist, we want
  84 * it to be preceded by the "--" marker (or we want the user to
  85 * use a format like "./-filename")
  86 */
  87void verify_filename(const char *prefix, const char *arg)
  88{
  89        if (*arg == '-')
  90                die("bad flag '%s' used after filename", arg);
  91        if (check_filename(prefix, arg))
  92                return;
  93        die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
  94            "Use '--' to separate paths from revisions", arg);
  95}
  96
  97/*
  98 * Opposite of the above: the command line did not have -- marker
  99 * and we parsed the arg as a refname.  It should not be interpretable
 100 * as a filename.
 101 */
 102void verify_non_filename(const char *prefix, const char *arg)
 103{
 104        if (!is_inside_work_tree() || is_inside_git_dir())
 105                return;
 106        if (*arg == '-')
 107                return; /* flag */
 108        if (!check_filename(prefix, arg))
 109                return;
 110        die("ambiguous argument '%s': both revision and filename\n"
 111            "Use '--' to separate filenames from revisions", arg);
 112}
 113
 114const char **get_pathspec(const char *prefix, const char **pathspec)
 115{
 116        const char *entry = *pathspec;
 117        const char **src, **dst;
 118        int prefixlen;
 119
 120        if (!prefix && !entry)
 121                return NULL;
 122
 123        if (!entry) {
 124                static const char *spec[2];
 125                spec[0] = prefix;
 126                spec[1] = NULL;
 127                return spec;
 128        }
 129
 130        /* Otherwise we have to re-write the entries.. */
 131        src = pathspec;
 132        dst = pathspec;
 133        prefixlen = prefix ? strlen(prefix) : 0;
 134        while (*src) {
 135                const char *p = prefix_path(prefix, prefixlen, *src);
 136                *(dst++) = p;
 137                src++;
 138        }
 139        *dst = NULL;
 140        if (!*pathspec)
 141                return NULL;
 142        return pathspec;
 143}
 144
 145/*
 146 * Test if it looks like we're at a git directory.
 147 * We want to see:
 148 *
 149 *  - either an objects/ directory _or_ the proper
 150 *    GIT_OBJECT_DIRECTORY environment variable
 151 *  - a refs/ directory
 152 *  - either a HEAD symlink or a HEAD file that is formatted as
 153 *    a proper "ref:", or a regular file HEAD that has a properly
 154 *    formatted sha1 object name.
 155 */
 156static int is_git_directory(const char *suspect)
 157{
 158        char path[PATH_MAX];
 159        size_t len = strlen(suspect);
 160
 161        strcpy(path, suspect);
 162        if (getenv(DB_ENVIRONMENT)) {
 163                if (access(getenv(DB_ENVIRONMENT), X_OK))
 164                        return 0;
 165        }
 166        else {
 167                strcpy(path + len, "/objects");
 168                if (access(path, X_OK))
 169                        return 0;
 170        }
 171
 172        strcpy(path + len, "/refs");
 173        if (access(path, X_OK))
 174                return 0;
 175
 176        strcpy(path + len, "/HEAD");
 177        if (validate_headref(path))
 178                return 0;
 179
 180        return 1;
 181}
 182
 183int is_inside_git_dir(void)
 184{
 185        if (inside_git_dir < 0)
 186                inside_git_dir = is_inside_dir(get_git_dir());
 187        return inside_git_dir;
 188}
 189
 190int is_inside_work_tree(void)
 191{
 192        if (inside_work_tree < 0)
 193                inside_work_tree = is_inside_dir(get_git_work_tree());
 194        return inside_work_tree;
 195}
 196
 197/*
 198 * set_work_tree() is only ever called if you set GIT_DIR explicitely.
 199 * The old behaviour (which we retain here) is to set the work tree root
 200 * to the cwd, unless overridden by the config, the command line, or
 201 * GIT_WORK_TREE.
 202 */
 203static const char *set_work_tree(const char *dir)
 204{
 205        char buffer[PATH_MAX + 1];
 206
 207        if (!getcwd(buffer, sizeof(buffer)))
 208                die ("Could not get the current working directory");
 209        git_work_tree_cfg = xstrdup(buffer);
 210        inside_work_tree = 1;
 211
 212        return NULL;
 213}
 214
 215void setup_work_tree(void)
 216{
 217        const char *work_tree, *git_dir;
 218        static int initialized = 0;
 219
 220        if (initialized)
 221                return;
 222        work_tree = get_git_work_tree();
 223        git_dir = get_git_dir();
 224        if (!is_absolute_path(git_dir))
 225                git_dir = make_absolute_path(git_dir);
 226        if (!work_tree || chdir(work_tree))
 227                die("This operation must be run in a work tree");
 228        set_git_dir(make_relative_path(git_dir, work_tree));
 229        initialized = 1;
 230}
 231
 232static int check_repository_format_gently(int *nongit_ok)
 233{
 234        git_config(check_repository_format_version, NULL);
 235        if (GIT_REPO_VERSION < repository_format_version) {
 236                if (!nongit_ok)
 237                        die ("Expected git repo version <= %d, found %d",
 238                             GIT_REPO_VERSION, repository_format_version);
 239                warning("Expected git repo version <= %d, found %d",
 240                        GIT_REPO_VERSION, repository_format_version);
 241                warning("Please upgrade Git");
 242                *nongit_ok = -1;
 243                return -1;
 244        }
 245        return 0;
 246}
 247
 248/*
 249 * Try to read the location of the git directory from the .git file,
 250 * return path to git directory if found.
 251 */
 252const char *read_gitfile_gently(const char *path)
 253{
 254        char *buf;
 255        struct stat st;
 256        int fd;
 257        size_t len;
 258
 259        if (stat(path, &st))
 260                return NULL;
 261        if (!S_ISREG(st.st_mode))
 262                return NULL;
 263        fd = open(path, O_RDONLY);
 264        if (fd < 0)
 265                die_errno("Error opening '%s'", path);
 266        buf = xmalloc(st.st_size + 1);
 267        len = read_in_full(fd, buf, st.st_size);
 268        close(fd);
 269        if (len != st.st_size)
 270                die("Error reading %s", path);
 271        buf[len] = '\0';
 272        if (prefixcmp(buf, "gitdir: "))
 273                die("Invalid gitfile format: %s", path);
 274        while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
 275                len--;
 276        if (len < 9)
 277                die("No path in gitfile: %s", path);
 278        buf[len] = '\0';
 279        if (!is_git_directory(buf + 8))
 280                die("Not a git repository: %s", buf + 8);
 281        path = make_absolute_path(buf + 8);
 282        free(buf);
 283        return path;
 284}
 285
 286/*
 287 * We cannot decide in this function whether we are in the work tree or
 288 * not, since the config can only be read _after_ this function was called.
 289 */
 290const char *setup_git_directory_gently(int *nongit_ok)
 291{
 292        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 293        const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
 294        static char cwd[PATH_MAX+1];
 295        const char *gitdirenv;
 296        const char *gitfile_dir;
 297        int len, offset, ceil_offset;
 298
 299        /*
 300         * Let's assume that we are in a git repository.
 301         * If it turns out later that we are somewhere else, the value will be
 302         * updated accordingly.
 303         */
 304        if (nongit_ok)
 305                *nongit_ok = 0;
 306
 307        /*
 308         * If GIT_DIR is set explicitly, we're not going
 309         * to do any discovery, but we still do repository
 310         * validation.
 311         */
 312        gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 313        if (gitdirenv) {
 314                if (PATH_MAX - 40 < strlen(gitdirenv))
 315                        die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 316                if (is_git_directory(gitdirenv)) {
 317                        static char buffer[1024 + 1];
 318                        const char *retval;
 319
 320                        if (!work_tree_env) {
 321                                retval = set_work_tree(gitdirenv);
 322                                /* config may override worktree */
 323                                if (check_repository_format_gently(nongit_ok))
 324                                        return NULL;
 325                                return retval;
 326                        }
 327                        if (check_repository_format_gently(nongit_ok))
 328                                return NULL;
 329                        retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
 330                                        get_git_work_tree());
 331                        if (!retval || !*retval)
 332                                return NULL;
 333                        set_git_dir(make_absolute_path(gitdirenv));
 334                        if (chdir(work_tree_env) < 0)
 335                                die_errno ("Could not chdir to '%s'", work_tree_env);
 336                        strcat(buffer, "/");
 337                        return retval;
 338                }
 339                if (nongit_ok) {
 340                        *nongit_ok = 1;
 341                        return NULL;
 342                }
 343                die("Not a git repository: '%s'", gitdirenv);
 344        }
 345
 346        if (!getcwd(cwd, sizeof(cwd)-1))
 347                die_errno("Unable to read current working directory");
 348
 349        ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
 350        if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
 351                ceil_offset = 1;
 352
 353        /*
 354         * Test in the following order (relative to the cwd):
 355         * - .git (file containing "gitdir: <path>")
 356         * - .git/
 357         * - ./ (bare)
 358         * - ../.git
 359         * - ../.git/
 360         * - ../ (bare)
 361         * - ../../.git/
 362         *   etc.
 363         */
 364        offset = len = strlen(cwd);
 365        for (;;) {
 366                gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
 367                if (gitfile_dir) {
 368                        if (set_git_dir(gitfile_dir))
 369                                die("Repository setup failed");
 370                        break;
 371                }
 372                if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
 373                        break;
 374                if (is_git_directory(".")) {
 375                        inside_git_dir = 1;
 376                        if (!work_tree_env)
 377                                inside_work_tree = 0;
 378                        if (offset != len) {
 379                                cwd[offset] = '\0';
 380                                setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
 381                        } else
 382                                setenv(GIT_DIR_ENVIRONMENT, ".", 1);
 383                        check_repository_format_gently(nongit_ok);
 384                        return NULL;
 385                }
 386                while (--offset > ceil_offset && cwd[offset] != '/');
 387                if (offset <= ceil_offset) {
 388                        if (nongit_ok) {
 389                                if (chdir(cwd))
 390                                        die_errno("Cannot come back to cwd");
 391                                *nongit_ok = 1;
 392                                return NULL;
 393                        }
 394                        die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
 395                }
 396                if (chdir(".."))
 397                        die_errno("Cannot change to '%s/..'", cwd);
 398        }
 399
 400        inside_git_dir = 0;
 401        if (!work_tree_env)
 402                inside_work_tree = 1;
 403        git_work_tree_cfg = xstrndup(cwd, offset);
 404        if (check_repository_format_gently(nongit_ok))
 405                return NULL;
 406        if (offset == len)
 407                return NULL;
 408
 409        /* Make "offset" point to past the '/', and add a '/' at the end */
 410        offset++;
 411        cwd[len++] = '/';
 412        cwd[len] = 0;
 413        return cwd + offset;
 414}
 415
 416int git_config_perm(const char *var, const char *value)
 417{
 418        int i;
 419        char *endptr;
 420
 421        if (value == NULL)
 422                return PERM_GROUP;
 423
 424        if (!strcmp(value, "umask"))
 425                return PERM_UMASK;
 426        if (!strcmp(value, "group"))
 427                return PERM_GROUP;
 428        if (!strcmp(value, "all") ||
 429            !strcmp(value, "world") ||
 430            !strcmp(value, "everybody"))
 431                return PERM_EVERYBODY;
 432
 433        /* Parse octal numbers */
 434        i = strtol(value, &endptr, 8);
 435
 436        /* If not an octal number, maybe true/false? */
 437        if (*endptr != 0)
 438                return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
 439
 440        /*
 441         * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
 442         * a chmod value to restrict to.
 443         */
 444        switch (i) {
 445        case PERM_UMASK:               /* 0 */
 446                return PERM_UMASK;
 447        case OLD_PERM_GROUP:           /* 1 */
 448                return PERM_GROUP;
 449        case OLD_PERM_EVERYBODY:       /* 2 */
 450                return PERM_EVERYBODY;
 451        }
 452
 453        /* A filemode value was given: 0xxx */
 454
 455        if ((i & 0600) != 0600)
 456                die("Problem with core.sharedRepository filemode value "
 457                    "(0%.3o).\nThe owner of files must always have "
 458                    "read and write permissions.", i);
 459
 460        /*
 461         * Mask filemode value. Others can not get write permission.
 462         * x flags for directories are handled separately.
 463         */
 464        return -(i & 0666);
 465}
 466
 467int check_repository_format_version(const char *var, const char *value, void *cb)
 468{
 469        if (strcmp(var, "core.repositoryformatversion") == 0)
 470                repository_format_version = git_config_int(var, value);
 471        else if (strcmp(var, "core.sharedrepository") == 0)
 472                shared_repository = git_config_perm(var, value);
 473        else if (strcmp(var, "core.bare") == 0) {
 474                is_bare_repository_cfg = git_config_bool(var, value);
 475                if (is_bare_repository_cfg == 1)
 476                        inside_work_tree = -1;
 477        } else if (strcmp(var, "core.worktree") == 0) {
 478                if (!value)
 479                        return config_error_nonbool(var);
 480                free(git_work_tree_cfg);
 481                git_work_tree_cfg = xstrdup(value);
 482                inside_work_tree = -1;
 483        }
 484        return 0;
 485}
 486
 487int check_repository_format(void)
 488{
 489        return check_repository_format_gently(NULL);
 490}
 491
 492const char *setup_git_directory(void)
 493{
 494        const char *retval = setup_git_directory_gently(NULL);
 495
 496        /* If the work tree is not the default one, recompute prefix */
 497        if (inside_work_tree < 0) {
 498                static char buffer[PATH_MAX + 1];
 499                char *rel;
 500                if (retval && chdir(retval))
 501                        die_errno ("Could not jump back into original cwd");
 502                rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
 503                if (rel && *rel && chdir(get_git_work_tree()))
 504                        die_errno ("Could not jump to working directory");
 505                return rel && *rel ? strcat(rel, "/") : NULL;
 506        }
 507
 508        return retval;
 509}