$ git clone -n https://src.fedoraproject.org/rpms/fetchlog.git /var/lib/mock/f41-build-1020729-18018/root/chroot_tmpdir/scmroot/fetchlog
Cloning into '/var/lib/mock/f41-build-1020729-18018/root/chroot_tmpdir/scmroot/fetchlog'...
$ git fetch origin e26a3165847bc4166cb0e1b3324c4972dfdd0cec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fetchlog
 * [new ref]         e26a3165847bc4166cb0e1b3324c4972dfdd0cec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e26a316 Eliminate use of obsolete %patchN syntax (#2283636)