$ git clone -n https://src.fedoraproject.org/rpms/perl-File-DesktopEntry.git /var/lib/mock/f40-build-2624021-65036/root/chroot_tmpdir/scmroot/perl-File-DesktopEntry
Cloning into '/var/lib/mock/f40-build-2624021-65036/root/chroot_tmpdir/scmroot/perl-File-DesktopEntry'...
$ git fetch origin ff058ca4a37b9f90b65d1f6f7fd4a3ffd5e01fa8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-DesktopEntry
 * [new ref]         ff058ca4a37b9f90b65d1f6f7fd4a3ffd5e01fa8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff058ca Break a build cycle