$ git clone -n https://src.fedoraproject.org/rpms/qemu-sanity-check.git /var/lib/mock/f40-build-799066-142138/root/chroot_tmpdir/scmroot/qemu-sanity-check
Cloning into '/var/lib/mock/f40-build-799066-142138/root/chroot_tmpdir/scmroot/qemu-sanity-check'...
$ git fetch origin d72def46ca1ffe1bf36d48ff919e13c71e52bd08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qemu-sanity-check
 * [new ref]         d72def46ca1ffe1bf36d48ff919e13c71e52bd08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d72def4 Look for kernels in /lib/modules/*/vmlinuz