$ git clone -n https://src.fedoraproject.org/rpms/xastir.git /var/lib/mock/f42-build-864826-172594/root/chroot_tmpdir/scmroot/xastir
Cloning into '/var/lib/mock/f42-build-864826-172594/root/chroot_tmpdir/scmroot/xastir'...
$ git fetch origin d55506fb0793ced9b3671ede0c8ef23400542de1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xastir
 * [new ref]         d55506fb0793ced9b3671ede0c8ef23400542de1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d55506f Rebuild for hdf5 1.14.5