Function import_object

builtin/replace.c:263–323

* Read a previously-exported (and possibly edited) object back from "filename", * interpreting it as "type", and writing the result to the object database. * The sha1 of the written object is returned via sha1. */

 * The sha1 of the written object is returned via sha1.
 */
static int import_object(struct object_id *oid, enum object_type type,
			  int raw, const char *filename)
{
	int fd;

	fd = open(filename, O_RDONLY);
	if (fd < 0)
		return error_errno(_("unable to open %s for reading"), filename);

	if (!raw && type == OBJ_TREE) {
		struct child_process cmd = CHILD_PROCESS_INIT;
		struct strbuf result = STRBUF_INIT;

		strvec_push(&cmd.args, "mktree");
		cmd.git_cmd = 1;
		cmd.in = fd;
		cmd.out = -1;

		if (start_command(&cmd)) {
			close(fd);
			return error(_("unable to spawn mktree"));
		}

		if (strbuf_read(&result, cmd.out, the_hash_algo->hexsz + 1) < 0) {
			error_errno(_("unable to read from mktree"));
			close(fd);
			close(cmd.out);
			return -1;
		}
		close(cmd.out);

		if (finish_command(&cmd)) {
			strbuf_release(&result);
			return error(_("mktree reported failure"));
		}
		if (get_oid_hex(result.buf, oid) < 0) {
			strbuf_release(&result);
			return error(_("mktree did not return an object name"));
		}

		strbuf_release(&result);
	} else {
		struct stat st;
		int flags = INDEX_FORMAT_CHECK | INDEX_WRITE_OBJECT;

		if (fstat(fd, &st) < 0) {
			error_errno(_("unable to fstat %s"), filename);
			close(fd);
			return -1;
		}
		if (index_fd(the_repository->index, oid, fd, &st, type, NULL, flags) < 0)
			return error(_("unable to write object to database"));
		/* index_fd close()s fd for us */
	}

	/*
	 * No need to close(fd) here; both run-command and index-fd
	 * will have done it for us.