$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Virt.git /var/lib/mock/f41-build-817722-150855/root/chroot_tmpdir/scmroot/perl-Sys-Virt
Cloning into '/var/lib/mock/f41-build-817722-150855/root/chroot_tmpdir/scmroot/perl-Sys-Virt'...
$ git fetch origin 85d187488d80f48d4be774c2d3f76c450fb50558:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Virt
 * [new ref]         85d187488d80f48d4be774c2d3f76c450fb50558 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85d1874 10.5.0 bump (rhbz#2298295)