Andrew's git - gitweb.git/blob

   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        for (;;) {
  11                char c;
  12                if (*path != '.')
  13                        break;
  14                c = path[1];
  15                /* "." */
  16                if (!c) {
  17                        path++;
  18                        break;
  19                }
  20                /* "./" */
  21                if (c == '/') {
  22                        path += 2;
  23                        continue;
  24                }
  25                if (c != '.')
  26                        break;
  27                c = path[2];
  28                if (!c)
  29                        path += 2;
  30                else if (c == '/')
  31                        path += 3;
  32                else
  33                        break;
  34                /* ".." and "../" */
  35                /* Remove last component of the prefix */
  36                do {
  37                        if (!len)
  38                                die("'%s' is outside repository", orig);
  39                        len--;
  40                } while (len && prefix[len-1] != '/');
  41                continue;
  42        }
  43        if (len) {
  44                int speclen = strlen(path);
  45                char *n = xmalloc(speclen + len + 1);
  46
  47                memcpy(n, prefix, len);
  48                memcpy(n + len, path, speclen+1);
  49                path = n;
  50        }
  51        return path;
  52}
  53
  54/*
  55 * Unlike prefix_path, this should be used if the named file does
  56 * not have to interact with index entry; i.e. name of a random file
  57 * on the filesystem.
  58 */
  59const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
  60{
  61        static char path[PATH_MAX];
  62        if (!pfx || !*pfx || arg[0] == '/')
  63                return arg;
  64        memcpy(path, pfx, pfx_len);
  65        strcpy(path + pfx_len, arg);
  66        return path;
  67}
  68
  69/*
  70 * Verify a filename that we got as an argument for a pathspec
  71 * entry. Note that a filename that begins with "-" never verifies
  72 * as true, because even if such a filename were to exist, we want
  73 * it to be preceded by the "--" marker (or we want the user to
  74 * use a format like "./-filename")
  75 */
  76void verify_filename(const char *prefix, const char *arg)
  77{
  78        const char *name;
  79        struct stat st;
  80
  81        if (*arg == '-')
  82                die("bad flag '%s' used after filename", arg);
  83        name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
  84        if (!lstat(name, &st))
  85                return;
  86        if (errno == ENOENT)
  87                die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
  88                    "Use '--' to separate paths from revisions", arg);
  89        die("'%s': %s", arg, strerror(errno));
  90}
  91
  92/*
  93 * Opposite of the above: the command line did not have -- marker
  94 * and we parsed the arg as a refname.  It should not be interpretable
  95 * as a filename.
  96 */
  97void verify_non_filename(const char *prefix, const char *arg)
  98{
  99        const char *name;
 100        struct stat st;
 101
 102        if (!is_inside_work_tree() || is_inside_git_dir())
 103                return;
 104        if (*arg == '-')
 105                return; /* flag */
 106        name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
 107        if (!lstat(name, &st))
 108                die("ambiguous argument '%s': both revision and filename\n"
 109                    "Use '--' to separate filenames from revisions", arg);
 110        if (errno != ENOENT)
 111                die("'%s': %s", arg, strerror(errno));
 112}
 113
 114const char **get_pathspec(const char *prefix, const char **pathspec)
 115{
 116        const char *entry = *pathspec;
 117        const char **p;
 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        p = pathspec;
 132        prefixlen = prefix ? strlen(prefix) : 0;
 133        do {
 134                *p = prefix_path(prefix, prefixlen, entry);
 135        } while ((entry = *++p) != NULL);
 136        return (const char **) pathspec;
 137}
 138
 139/*
 140 * Test if it looks like we're at a git directory.
 141 * We want to see:
 142 *
 143 *  - either a objects/ directory _or_ the proper
 144 *    GIT_OBJECT_DIRECTORY environment variable
 145 *  - a refs/ directory
 146 *  - either a HEAD symlink or a HEAD file that is formatted as
 147 *    a proper "ref:", or a regular file HEAD that has a properly
 148 *    formatted sha1 object name.
 149 */
 150static int is_git_directory(const char *suspect)
 151{
 152        char path[PATH_MAX];
 153        size_t len = strlen(suspect);
 154
 155        strcpy(path, suspect);
 156        if (getenv(DB_ENVIRONMENT)) {
 157                if (access(getenv(DB_ENVIRONMENT), X_OK))
 158                        return 0;
 159        }
 160        else {
 161                strcpy(path + len, "/objects");
 162                if (access(path, X_OK))
 163                        return 0;
 164        }
 165
 166        strcpy(path + len, "/refs");
 167        if (access(path, X_OK))
 168                return 0;
 169
 170        strcpy(path + len, "/HEAD");
 171        if (validate_headref(path))
 172                return 0;
 173
 174        return 1;
 175}
 176
 177int is_inside_git_dir(void)
 178{
 179        if (inside_git_dir < 0)
 180                inside_git_dir = is_inside_dir(get_git_dir());
 181        return inside_git_dir;
 182}
 183
 184int is_inside_work_tree(void)
 185{
 186        if (inside_work_tree < 0)
 187                inside_work_tree = is_inside_dir(get_git_work_tree());
 188        return inside_work_tree;
 189}
 190
 191/*
 192 * If no worktree was given, and we are outside of a default work tree,
 193 * now is the time to set it.
 194 *
 195 * In other words, if the user calls git with something like
 196 *
 197 *      git --git-dir=/some/where/else/.git bla
 198 *
 199 * default to /some/where/else as working directory; if the specified
 200 * git-dir does not end in "/.git", the cwd is used as working directory.
 201 */
 202const char *set_work_tree(const char *dir)
 203{
 204        char dir_buffer[PATH_MAX];
 205        static char buffer[PATH_MAX + 1], *rel = NULL;
 206        int len, postfix_len = strlen(DEFAULT_GIT_DIR_ENVIRONMENT) + 1;
 207
 208        /* strip the variable 'dir' of the postfix "/.git" if it has it */
 209        len = strlen(dir);
 210        if (len > postfix_len && !strcmp(dir + len - postfix_len,
 211                                "/" DEFAULT_GIT_DIR_ENVIRONMENT)) {
 212                        strncpy(dir_buffer, dir, len - postfix_len);
 213
 214                /* are we inside the default work tree? */
 215                rel = get_relative_cwd(buffer, sizeof(buffer), dir_buffer);
 216        }
 217        /* if rel is set, the cwd is _not_ the current working tree */
 218        if (rel && *rel) {
 219                if (!is_absolute_path(dir))
 220                        set_git_dir(make_absolute_path(dir));
 221                dir = dir_buffer;
 222                chdir(dir);
 223                strcat(rel, "/");
 224                inside_git_dir = 0;
 225        } else {
 226                rel = NULL;
 227                dir = getcwd(buffer, sizeof(buffer));
 228        }
 229        git_work_tree_cfg = xstrdup(dir);
 230        inside_work_tree = 1;
 231
 232        return rel;
 233}
 234
 235/*
 236 * We cannot decide in this function whether we are in the work tree or
 237 * not, since the config can only be read _after_ this function was called.
 238 */
 239const char *setup_git_directory_gently(int *nongit_ok)
 240{
 241        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
 242        static char cwd[PATH_MAX+1];
 243        const char *gitdirenv;
 244        int len, offset;
 245
 246        /*
 247         * If GIT_DIR is set explicitly, we're not going
 248         * to do any discovery, but we still do repository
 249         * validation.
 250         */
 251        gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
 252        if (gitdirenv) {
 253                if (PATH_MAX - 40 < strlen(gitdirenv))
 254                        die("'$%s' too big", GIT_DIR_ENVIRONMENT);
 255                if (is_git_directory(gitdirenv)) {
 256                        if (!work_tree_env)
 257                                return set_work_tree(gitdirenv);
 258                        return NULL;
 259                }
 260                if (nongit_ok) {
 261                        *nongit_ok = 1;
 262                        return NULL;
 263                }
 264                die("Not a git repository: '%s'", gitdirenv);
 265        }
 266
 267        if (!getcwd(cwd, sizeof(cwd)-1))
 268                die("Unable to read current working directory");
 269
 270        /*
 271         * Test in the following order (relative to the cwd):
 272         * - .git/
 273         * - ./ (bare)
 274         * - ../.git/
 275         * - ../ (bare)
 276         * - ../../.git/
 277         *   etc.
 278         */
 279        offset = len = strlen(cwd);
 280        for (;;) {
 281                if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
 282                        break;
 283                if (is_git_directory(".")) {
 284                        inside_git_dir = 1;
 285                        if (!work_tree_env)
 286                                inside_work_tree = 0;
 287                        setenv(GIT_DIR_ENVIRONMENT, ".", 1);
 288                        return NULL;
 289                }
 290                chdir("..");
 291                do {
 292                        if (!offset) {
 293                                if (nongit_ok) {
 294                                        if (chdir(cwd))
 295                                                die("Cannot come back to cwd");
 296                                        *nongit_ok = 1;
 297                                        return NULL;
 298                                }
 299                                die("Not a git repository");
 300                        }
 301                } while (cwd[--offset] != '/');
 302        }
 303
 304        inside_git_dir = 0;
 305        if (!work_tree_env)
 306                inside_work_tree = 1;
 307        git_work_tree_cfg = xstrndup(cwd, offset);
 308        if (offset == len)
 309                return NULL;
 310
 311        /* Make "offset" point to past the '/', and add a '/' at the end */
 312        offset++;
 313        cwd[len++] = '/';
 314        cwd[len] = 0;
 315        return cwd + offset;
 316}
 317
 318int git_config_perm(const char *var, const char *value)
 319{
 320        if (value) {
 321                int i;
 322                if (!strcmp(value, "umask"))
 323                        return PERM_UMASK;
 324                if (!strcmp(value, "group"))
 325                        return PERM_GROUP;
 326                if (!strcmp(value, "all") ||
 327                    !strcmp(value, "world") ||
 328                    !strcmp(value, "everybody"))
 329                        return PERM_EVERYBODY;
 330                i = atoi(value);
 331                if (i > 1)
 332                        return i;
 333        }
 334        return git_config_bool(var, value);
 335}
 336
 337int check_repository_format_version(const char *var, const char *value)
 338{
 339        if (strcmp(var, "core.repositoryformatversion") == 0)
 340                repository_format_version = git_config_int(var, value);
 341        else if (strcmp(var, "core.sharedrepository") == 0)
 342                shared_repository = git_config_perm(var, value);
 343        else if (strcmp(var, "core.bare") == 0) {
 344                is_bare_repository_cfg = git_config_bool(var, value);
 345                if (is_bare_repository_cfg == 1)
 346                        inside_work_tree = -1;
 347        } else if (strcmp(var, "core.worktree") == 0) {
 348                if (git_work_tree_cfg)
 349                        free(git_work_tree_cfg);
 350                git_work_tree_cfg = xstrdup(value);
 351                inside_work_tree = -1;
 352        }
 353        return 0;
 354}
 355
 356int check_repository_format(void)
 357{
 358        git_config(check_repository_format_version);
 359        if (GIT_REPO_VERSION < repository_format_version)
 360                die ("Expected git repo version <= %d, found %d",
 361                     GIT_REPO_VERSION, repository_format_version);
 362        return 0;
 363}
 364
 365const char *setup_git_directory(void)
 366{
 367        const char *retval = setup_git_directory_gently(NULL);
 368        check_repository_format();
 369
 370        /* If the work tree is not the default one, recompute prefix */
 371        if (inside_work_tree < 0) {
 372                static char buffer[PATH_MAX + 1];
 373                char *rel;
 374                if (retval && chdir(retval))
 375                        die ("Could not jump back into original cwd");
 376                rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
 377                return rel && *rel ? strcat(rel, "/") : NULL;
 378        }
 379
 380        return retval;
 381}