#include "cache.h" #include "blob.h" #include "dir.h" static void create_directories(const char *path, int path_len, const struct checkout *state) { char *buf = xmalloc(path_len + 1); int len = 0; while (len < path_len) { do { buf[len] = path[len]; len++; } while (len < path_len && path[len] != '/'); if (len >= path_len) break; buf[len] = 0; /* * For 'checkout-index --prefix=<dir>', <dir> is * allowed to be a symlink to an existing directory, * and we set 'state->base_dir_len' below, such that * we test the path components of the prefix with the * stat() function instead of the lstat() function. */ if (has_dirs_only_path(buf, len, state->base_dir_len)) continue; /* ok, it is already a directory. */ /* * If this mkdir() would fail, it could be that there * is already a symlink or something else exists * there, therefore we then try to unlink it and try * one more time to create the directory. */ if (mkdir(buf, 0777)) { if (errno == EEXIST && state->force && !unlink_or_warn(buf) && !mkdir(buf, 0777)) continue; die_errno("cannot create directory at '%s'", buf); } } free(buf); } static void remove_subtree(const char *path) { DIR *dir = opendir(path); struct dirent *de; char pathbuf[PATH_MAX]; char *name; if (!dir) die_errno("cannot opendir '%s'", path); strcpy(pathbuf, path); name = pathbuf + strlen(path); *name++ = '/'; while ((de = readdir(dir)) != NULL) { struct stat st; if (is_dot_or_dotdot(de->d_name)) continue; strcpy(name, de->d_name); if (lstat(pathbuf, &st)) die_errno("cannot lstat '%s'", pathbuf); if (S_ISDIR(st.st_mode)) remove_subtree(pathbuf); else if (unlink(pathbuf)) die_errno("cannot unlink '%s'", pathbuf); } closedir(dir); if (rmdir(path)) die_errno("cannot rmdir '%s'", path); } static int create_file(const char *path, unsigned int mode) { mode = (mode & 0100) ? 0777 : 0666; return open(path, O_WRONLY | O_CREAT | O_EXCL, mode); } static void *read_blob_entry(struct cache_entry *ce, unsigned long *size) { enum object_type type; void *new = read_sha1_file(ce->sha1, &type, size); if (new) { if (type == OBJ_BLOB) return new; free(new); } return NULL; } static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile) { unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT; int fd, ret, fstat_done = 0; char *new; struct strbuf buf = STRBUF_INIT; unsigned long size; size_t wrote, newsize = 0; struct stat st; switch (ce_mode_s_ifmt) { case S_IFREG: case S_IFLNK: new = read_blob_entry(ce, &size); if (!new) return error("git checkout-index: unable to read sha1 file of %s (%s)", path, sha1_to_hex(ce->sha1)); if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) { ret = symlink(new, path); free(new); if (ret) return error("git checkout-index: unable to create symlink %s (%s)", path, strerror(errno)); break; } /* * Convert from git internal format to working tree format */ if (ce_mode_s_ifmt == S_IFREG && convert_to_working_tree(ce->name, new, size, &buf)) { free(new); new = strbuf_detach(&buf, &newsize); size = newsize; } if (to_tempfile) { if (ce_mode_s_ifmt == S_IFREG) strcpy(path, ".merge_file_XXXXXX"); else strcpy(path, ".merge_link_XXXXXX"); fd = mkstemp(path); } else if (ce_mode_s_ifmt == S_IFREG) { fd = create_file(path, ce->ce_mode); } else { fd = create_file(path, 0666); } if (fd < 0) { free(new); return error("git checkout-index: unable to create file %s (%s)", path, strerror(errno)); } wrote = write_in_full(fd, new, size); /* use fstat() only when path == ce->name */ if (fstat_is_reliable() && state->refresh_cache && !to_tempfile && !state->base_dir_len) { fstat(fd, &st); fstat_done = 1; } close(fd); free(new); if (wrote != size) return error("git checkout-index: unable to write file %s", path); break; case S_IFGITLINK: if (to_tempfile) return error("git checkout-index: cannot create temporary subproject %s", path); if (mkdir(path, 0777) < 0) return error("git checkout-index: cannot create subproject directory %s", path); break; default: return error("git checkout-index: unknown file mode for %s", path); } if (state->refresh_cache) { if (!fstat_done) lstat(ce->name, &st); fill_stat_cache_info(ce, &st); } return 0; } /* * This is like 'lstat()', except it refuses to follow symlinks * in the path, after skipping "skiplen". */ int check_path(const char *path, int len, struct stat *st, int skiplen) { const char *slash = path + len; while (path < slash && *slash != '/') slash--; if (!has_dirs_only_path(path, slash - path, skiplen)) { errno = ENOENT; return -1; } return lstat(path, st); } int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath) { static char path[PATH_MAX + 1]; struct stat st; int len = state->base_dir_len; if (topath) return write_entry(ce, topath, state, 1); memcpy(path, state->base_dir, len); strcpy(path + len, ce->name); len += ce_namelen(ce); if (!check_path(path, len, &st, state->base_dir_len)) { unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); if (!changed) return 0; if (!state->force) { if (!state->quiet) fprintf(stderr, "git-checkout-index: %s already exists\n", path); return -1; } /* * We unlink the old file, to get the new one with the * right permissions (including umask, which is nasty * to emulate by hand - much easier to let the system * just do the right thing) */ if (S_ISDIR(st.st_mode)) { /* If it is a gitlink, leave it alone! */ if (S_ISGITLINK(ce->ce_mode)) return 0; if (!state->force) return error("%s is a directory", path); remove_subtree(path); } else if (unlink(path)) return error("unable to unlink old '%s' (%s)", path, strerror(errno)); } else if (state->not_new) return 0; create_directories(path, len, state); return write_entry(ce, path, state, 0); }