#include "cache.h" #include "dir.h" static int inside_git_dir = -1; static int inside_work_tree = -1; static int sanitary_path_copy(char *dst, const char *src) { char *dst0; if (has_dos_drive_prefix(src)) { *dst++ = *src++; *dst++ = *src++; } dst0 = dst; if (is_dir_sep(*src)) { *dst++ = '/'; while (is_dir_sep(*src)) src++; } for (;;) { char c = *src; /* * A path component that begins with . could be * special: * (1) "." and ends -- ignore and terminate. * (2) "./" -- ignore them, eat slash and continue. * (3) ".." and ends -- strip one and terminate. * (4) "../" -- strip one, eat slash and continue. */ if (c == '.') { if (!src[1]) { /* (1) */ src++; } else if (is_dir_sep(src[1])) { /* (2) */ src += 2; while (is_dir_sep(*src)) src++; continue; } else if (src[1] == '.') { if (!src[2]) { /* (3) */ src += 2; goto up_one; } else if (is_dir_sep(src[2])) { /* (4) */ src += 3; while (is_dir_sep(*src)) src++; goto up_one; } } } /* copy up to the next '/', and eat all '/' */ while ((c = *src++) != '\0' && !is_dir_sep(c)) *dst++ = c; if (is_dir_sep(c)) { *dst++ = '/'; while (is_dir_sep(c)) c = *src++; src--; } else if (!c) break; continue; up_one: /* * dst0..dst is prefix portion, and dst[-1] is '/'; * go up one level. */ dst -= 2; /* go past trailing '/' if any */ if (dst < dst0) return -1; while (1) { if (dst <= dst0) break; c = *dst--; if (c == '/') { /* MinGW: cannot be '\\' anymore */ dst += 2; break; } } } *dst = '\0'; return 0; } const char *prefix_path(const char *prefix, int len, const char *path) { const char *orig = path; char *sanitized = xmalloc(len + strlen(path) + 1); if (is_absolute_path(orig)) strcpy(sanitized, path); else { if (len) memcpy(sanitized, prefix, len); strcpy(sanitized + len, path); } if (sanitary_path_copy(sanitized, sanitized)) goto error_out; if (is_absolute_path(orig)) { const char *work_tree = get_git_work_tree(); size_t len = strlen(work_tree); size_t total = strlen(sanitized) + 1; if (strncmp(sanitized, work_tree, len) || (sanitized[len] != '\0' && sanitized[len] != '/')) { error_out: die("'%s' is outside repository", orig); } if (sanitized[len] == '/') len++; memmove(sanitized, sanitized + len, total - len); } return sanitized; } /* * Unlike prefix_path, this should be used if the named file does * not have to interact with index entry; i.e. name of a random file * on the filesystem. */ const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) { static char path[PATH_MAX]; #ifndef __MINGW32__ if (!pfx || !*pfx || is_absolute_path(arg)) return arg; memcpy(path, pfx, pfx_len); strcpy(path + pfx_len, arg); #else char *p; /* don't add prefix to absolute paths, but still replace '\' by '/' */ if (is_absolute_path(arg)) pfx_len = 0; else memcpy(path, pfx, pfx_len); strcpy(path + pfx_len, arg); for (p = path + pfx_len; *p; p++) if (*p == '\\') *p = '/'; #endif return path; } /* * Verify a filename that we got as an argument for a pathspec * entry. Note that a filename that begins with "-" never verifies * as true, because even if such a filename were to exist, we want * it to be preceded by the "--" marker (or we want the user to * use a format like "./-filename") */ void verify_filename(const char *prefix, const char *arg) { const char *name; struct stat st; if (*arg == '-') die("bad flag '%s' used after filename", arg); name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; if (!lstat(name, &st)) return; if (errno == ENOENT) die("ambiguous argument '%s': unknown revision or path not in the working tree.\n" "Use '--' to separate paths from revisions", arg); die("'%s': %s", arg, strerror(errno)); } /* * Opposite of the above: the command line did not have -- marker * and we parsed the arg as a refname. It should not be interpretable * as a filename. */ void verify_non_filename(const char *prefix, const char *arg) { const char *name; struct stat st; if (!is_inside_work_tree() || is_inside_git_dir()) return; if (*arg == '-') return; /* flag */ name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg; if (!lstat(name, &st)) die("ambiguous argument '%s': both revision and filename\n" "Use '--' to separate filenames from revisions", arg); if (errno != ENOENT && errno != ENOTDIR) die("'%s': %s", arg, strerror(errno)); } const char **get_pathspec(const char *prefix, const char **pathspec) { const char *entry = *pathspec; const char **src, **dst; int prefixlen; if (!prefix && !entry) return NULL; if (!entry) { static const char *spec[2]; spec[0] = prefix; spec[1] = NULL; return spec; } /* Otherwise we have to re-write the entries.. */ src = pathspec; dst = pathspec; prefixlen = prefix ? strlen(prefix) : 0; while (*src) { const char *p = prefix_path(prefix, prefixlen, *src); *(dst++) = p; src++; } *dst = NULL; if (!*pathspec) return NULL; return pathspec; } /* * Test if it looks like we're at a git directory. * We want to see: * * - either an objects/ directory _or_ the proper * GIT_OBJECT_DIRECTORY environment variable * - a refs/ directory * - either a HEAD symlink or a HEAD file that is formatted as * a proper "ref:", or a regular file HEAD that has a properly * formatted sha1 object name. */ static int is_git_directory(const char *suspect) { char path[PATH_MAX]; size_t len = strlen(suspect); strcpy(path, suspect); if (getenv(DB_ENVIRONMENT)) { if (access(getenv(DB_ENVIRONMENT), X_OK)) return 0; } else { strcpy(path + len, "/objects"); if (access(path, X_OK)) return 0; } strcpy(path + len, "/refs"); if (access(path, X_OK)) return 0; strcpy(path + len, "/HEAD"); if (validate_headref(path)) return 0; return 1; } int is_inside_git_dir(void) { if (inside_git_dir < 0) inside_git_dir = is_inside_dir(get_git_dir()); return inside_git_dir; } int is_inside_work_tree(void) { if (inside_work_tree < 0) inside_work_tree = is_inside_dir(get_git_work_tree()); return inside_work_tree; } /* * set_work_tree() is only ever called if you set GIT_DIR explicitely. * The old behaviour (which we retain here) is to set the work tree root * to the cwd, unless overridden by the config, the command line, or * GIT_WORK_TREE. */ static const char *set_work_tree(const char *dir) { char buffer[PATH_MAX + 1]; if (!getcwd(buffer, sizeof(buffer))) die ("Could not get the current working directory"); git_work_tree_cfg = xstrdup(buffer); inside_work_tree = 1; return NULL; } void setup_work_tree(void) { const char *work_tree, *git_dir; static int initialized = 0; if (initialized) return; work_tree = get_git_work_tree(); git_dir = get_git_dir(); if (!is_absolute_path(git_dir)) git_dir = make_absolute_path(git_dir); if (!work_tree || chdir(work_tree)) die("This operation must be run in a work tree"); set_git_dir(make_relative_path(git_dir, work_tree)); initialized = 1; } static int check_repository_format_gently(int *nongit_ok) { git_config(check_repository_format_version, NULL); if (GIT_REPO_VERSION < repository_format_version) { if (!nongit_ok) die ("Expected git repo version <= %d, found %d", GIT_REPO_VERSION, repository_format_version); warning("Expected git repo version <= %d, found %d", GIT_REPO_VERSION, repository_format_version); warning("Please upgrade Git"); *nongit_ok = -1; return -1; } return 0; } /* * Try to read the location of the git directory from the .git file, * return path to git directory if found. */ const char *read_gitfile_gently(const char *path) { char *buf; struct stat st; int fd; size_t len; if (stat(path, &st)) return NULL; if (!S_ISREG(st.st_mode)) return NULL; fd = open(path, O_RDONLY); if (fd < 0) die("Error opening %s: %s", path, strerror(errno)); buf = xmalloc(st.st_size + 1); len = read_in_full(fd, buf, st.st_size); close(fd); if (len != st.st_size) die("Error reading %s", path); buf[len] = '\0'; if (prefixcmp(buf, "gitdir: ")) die("Invalid gitfile format: %s", path); while (buf[len - 1] == '\n' || buf[len - 1] == '\r') len--; if (len < 9) die("No path in gitfile: %s", path); buf[len] = '\0'; if (!is_git_directory(buf + 8)) die("Not a git repository: %s", buf + 8); path = make_absolute_path(buf + 8); free(buf); return path; } /* * We cannot decide in this function whether we are in the work tree or * not, since the config can only be read _after_ this function was called. */ const char *setup_git_directory_gently(int *nongit_ok) { const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT); const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT); static char cwd[PATH_MAX+1]; const char *gitdirenv; const char *gitfile_dir; int len, offset, ceil_offset; /* * Let's assume that we are in a git repository. * If it turns out later that we are somewhere else, the value will be * updated accordingly. */ if (nongit_ok) *nongit_ok = 0; /* * If GIT_DIR is set explicitly, we're not going * to do any discovery, but we still do repository * validation. */ gitdirenv = getenv(GIT_DIR_ENVIRONMENT); if (gitdirenv) { if (PATH_MAX - 40 < strlen(gitdirenv)) die("'$%s' too big", GIT_DIR_ENVIRONMENT); if (is_git_directory(gitdirenv)) { static char buffer[1024 + 1]; const char *retval; if (!work_tree_env) { retval = set_work_tree(gitdirenv); /* config may override worktree */ if (check_repository_format_gently(nongit_ok)) return NULL; return retval; } if (check_repository_format_gently(nongit_ok)) return NULL; retval = get_relative_cwd(buffer, sizeof(buffer) - 1, get_git_work_tree()); if (!retval || !*retval) return NULL; set_git_dir(make_absolute_path(gitdirenv)); if (chdir(work_tree_env) < 0) die ("Could not chdir to %s", work_tree_env); strcat(buffer, "/"); return retval; } if (nongit_ok) { *nongit_ok = 1; return NULL; } die("Not a git repository: '%s'", gitdirenv); } if (!getcwd(cwd, sizeof(cwd)-1)) die("Unable to read current working directory"); ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs); if (ceil_offset < 0 && has_dos_drive_prefix(cwd)) ceil_offset = 1; /* * Test in the following order (relative to the cwd): * - .git (file containing "gitdir: <path>") * - .git/ * - ./ (bare) * - ../.git * - ../.git/ * - ../ (bare) * - ../../.git/ * etc. */ offset = len = strlen(cwd); for (;;) { gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT); if (gitfile_dir) { if (set_git_dir(gitfile_dir)) die("Repository setup failed"); break; } if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) break; if (is_git_directory(".")) { inside_git_dir = 1; if (!work_tree_env) inside_work_tree = 0; setenv(GIT_DIR_ENVIRONMENT, ".", 1); check_repository_format_gently(nongit_ok); return NULL; } while (--offset > ceil_offset && cwd[offset] != '/'); if (offset <= ceil_offset) { if (nongit_ok) { if (chdir(cwd)) die("Cannot come back to cwd"); *nongit_ok = 1; return NULL; } die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT); } if (chdir("..")) die("Cannot change to %s/..: %s", cwd, strerror(errno)); } inside_git_dir = 0; if (!work_tree_env) inside_work_tree = 1; git_work_tree_cfg = xstrndup(cwd, offset); if (check_repository_format_gently(nongit_ok)) return NULL; if (offset == len) return NULL; /* Make "offset" point to past the '/', and add a '/' at the end */ offset++; cwd[len++] = '/'; cwd[len] = 0; return cwd + offset; } int git_config_perm(const char *var, const char *value) { int i; char *endptr; if (value == NULL) return PERM_GROUP; if (!strcmp(value, "umask")) return PERM_UMASK; if (!strcmp(value, "group")) return PERM_GROUP; if (!strcmp(value, "all") || !strcmp(value, "world") || !strcmp(value, "everybody")) return PERM_EVERYBODY; /* Parse octal numbers */ i = strtol(value, &endptr, 8); /* If not an octal number, maybe true/false? */ if (*endptr != 0) return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK; /* * Treat values 0, 1 and 2 as compatibility cases, otherwise it is * a chmod value. */ switch (i) { case PERM_UMASK: /* 0 */ return PERM_UMASK; case OLD_PERM_GROUP: /* 1 */ return PERM_GROUP; case OLD_PERM_EVERYBODY: /* 2 */ return PERM_EVERYBODY; } /* A filemode value was given: 0xxx */ if ((i & 0600) != 0600) die("Problem with core.sharedRepository filemode value " "(0%.3o).\nThe owner of files must always have " "read and write permissions.", i); /* * Mask filemode value. Others can not get write permission. * x flags for directories are handled separately. */ return i & 0666; } int check_repository_format_version(const char *var, const char *value, void *cb) { if (strcmp(var, "core.repositoryformatversion") == 0) repository_format_version = git_config_int(var, value); else if (strcmp(var, "core.sharedrepository") == 0) shared_repository = git_config_perm(var, value); else if (strcmp(var, "core.bare") == 0) { is_bare_repository_cfg = git_config_bool(var, value); if (is_bare_repository_cfg == 1) inside_work_tree = -1; } else if (strcmp(var, "core.worktree") == 0) { if (!value) return config_error_nonbool(var); free(git_work_tree_cfg); git_work_tree_cfg = xstrdup(value); inside_work_tree = -1; } return 0; } int check_repository_format(void) { return check_repository_format_gently(NULL); } const char *setup_git_directory(void) { const char *retval = setup_git_directory_gently(NULL); /* If the work tree is not the default one, recompute prefix */ if (inside_work_tree < 0) { static char buffer[PATH_MAX + 1]; char *rel; if (retval && chdir(retval)) die ("Could not jump back into original cwd"); rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree()); if (rel && *rel && chdir(get_git_work_tree())) die ("Could not jump to working directory"); return rel && *rel ? strcat(rel, "/") : NULL; } return retval; }