$ git clone -n https://src.fedoraproject.org/rpms/ant-contrib.git /var/lib/mock/f39-build-1772096-41502/root/chroot_tmpdir/scmroot/ant-contrib
Cloning into '/var/lib/mock/f39-build-1772096-41502/root/chroot_tmpdir/scmroot/ant-contrib'...
$ git fetch origin 36f8f7a171f500762b0107b227ab813ea593cd8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ant-contrib
 * [new ref]         36f8f7a171f500762b0107b227ab813ea593cd8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36f8f7a Added ExclusiveArch