$ git clone -n https://src.fedoraproject.org/rpms/gentoo.git /var/lib/mock/f41-build-816154-14288/root/chroot_tmpdir/scmroot/gentoo
Cloning into '/var/lib/mock/f41-build-816154-14288/root/chroot_tmpdir/scmroot/gentoo'...
$ git fetch origin f60fe42282310ae263d670ef97a93bc56f01a89e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gentoo
 * [new ref]         f60fe42282310ae263d670ef97a93bc56f01a89e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f60fe42 Eliminate use of obsolete %patchN syntax (#2283636)