$ git clone -n https://src.fedoraproject.org/rpms/jaxb-dtd-parser.git /var/lib/mock/f40-build-2165372-50976/root/chroot_tmpdir/scmroot/jaxb-dtd-parser
Cloning into '/var/lib/mock/f40-build-2165372-50976/root/chroot_tmpdir/scmroot/jaxb-dtd-parser'...
$ git fetch origin 0a4dc0f2bb3c58f96f1dce7ce7371e39ffe5d0bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-dtd-parser
 * [new ref]         0a4dc0f2bb3c58f96f1dce7ce7371e39ffe5d0bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a4dc0f Update to upstream version 1.5.1