$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Virt.git /var/lib/mock/f41-build-843873-162239/root/chroot_tmpdir/scmroot/perl-Sys-Virt
Cloning into '/var/lib/mock/f41-build-843873-162239/root/chroot_tmpdir/scmroot/perl-Sys-Virt'...
$ git fetch origin 3541ff8b795d9f3c4d05cdd5a8d5080b555a45a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Virt
 * [new ref]         3541ff8b795d9f3c4d05cdd5a8d5080b555a45a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3541ff8 10.6.0 bump (rhbz#2303226)