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#include "cache.h" #include "blob.h" static void create_directories(const char *path, const struct checkout *state) { int len = strlen(path); char *buf = xmalloc(len + 1); const char *slash = path; while ((slash = strchr(slash+1, '/')) != NULL) { struct stat st; int stat_status; len = slash - path; memcpy(buf, path, len); buf[len] = 0; if (len <= state->base_dir_len) /* * checkout-index --prefix=<dir>; <dir> is * allowed to be a symlink to an existing * directory. */ stat_status = stat(buf, &st); else /* * if there currently is a symlink, we would * want to replace it with a real directory. */ stat_status = lstat(buf, &st); if (!stat_status && S_ISDIR(st.st_mode)) continue; /* ok, it is already a directory. */ /* * We know stat_status == 0 means something exists * there and this mkdir would fail, but that is an * error codepath; we do not care, as we unlink and * mkdir again in such a case. */ if (mkdir(buf, 0777)) { if (errno == EEXIST && state->force && !unlink(buf) && !mkdir(buf, 0777)) continue; die("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("cannot opendir %s (%s)", path, strerror(errno)); strcpy(pathbuf, path); name = pathbuf + strlen(path); *name++ = '/'; while ((de = readdir(dir)) != NULL) { struct stat st; if ((de->d_name[0] == '.') && ((de->d_name[1] == 0) || ((de->d_name[1] == '.') && de->d_name[2] == 0))) continue; strcpy(name, de->d_name); if (lstat(pathbuf, &st)) die("cannot lstat %s (%s)", pathbuf, strerror(errno)); if (S_ISDIR(st.st_mode)) remove_subtree(pathbuf); else if (unlink(pathbuf)) die("cannot unlink %s (%s)", pathbuf, strerror(errno)); } closedir(dir); if (rmdir(path)) die("cannot rmdir %s (%s)", path, strerror(errno)); } 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, const char *path, 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) { int fd; long wrote; switch (ce->ce_mode & S_IFMT) { char *new; struct strbuf buf; unsigned long size; case S_IFREG: new = read_blob_entry(ce, path, &size); if (!new) return error("git-checkout-index: unable to read sha1 file of %s (%s)", path, sha1_to_hex(ce->sha1)); /* * Convert from git internal format to working tree format */ strbuf_init(&buf, 0); if (convert_to_working_tree(ce->name, new, size, &buf)) { size_t newsize = 0; free(new); new = strbuf_detach(&buf, &newsize); size = newsize; } if (to_tempfile) { strcpy(path, ".merge_file_XXXXXX"); fd = mkstemp(path); } else fd = create_file(path, ce->ce_mode); 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); close(fd); free(new); if (wrote != size) return error("git-checkout-index: unable to write file %s", path); break; case S_IFLNK: new = read_blob_entry(ce, path, &size); if (!new) return error("git-checkout-index: unable to read sha1 file of %s (%s)", path, sha1_to_hex(ce->sha1)); if (to_tempfile || !has_symlinks) { if (to_tempfile) { strcpy(path, ".merge_link_XXXXXX"); fd = mkstemp(path); } 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); close(fd); free(new); if (wrote != size) return error("git-checkout-index: unable to write file %s", path); } else { wrote = symlink(new, path); free(new); if (wrote) return error("git-checkout-index: unable to create " "symlink %s (%s)", path, strerror(errno)); } 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) { struct stat st; lstat(ce->name, &st); fill_stat_cache_info(ce, &st); } return 0; } 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); if (!lstat(path, &st)) { unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID); 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, state); return write_entry(ce, path, state, 0); }
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