$ git clone -n https://src.fedoraproject.org/rpms/byaccj.git /var/lib/mock/f41-build-side-1-2656028-28431/root/chroot_tmpdir/scmroot/byaccj
Cloning into '/var/lib/mock/f41-build-side-1-2656028-28431/root/chroot_tmpdir/scmroot/byaccj'...
$ git fetch origin ea3c3ef04abf46392746b04482512fbdcffcfb13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byaccj
 * [new ref]         ea3c3ef04abf46392746b04482512fbdcffcfb13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea3c3ef Convert to %autorelease and %autochangelog