$ git clone -n https://src.fedoraproject.org/rpms/erlang-exometer_core.git /var/lib/mock/f41-build-3155054-40677/root/chroot_tmpdir/scmroot/erlang-exometer_core
Cloning into '/var/lib/mock/f41-build-3155054-40677/root/chroot_tmpdir/scmroot/erlang-exometer_core'...
$ git fetch origin c20a65c288193cac3adb3e849a81e8e35b68b2a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-exometer_core
 * [new ref]         c20a65c288193cac3adb3e849a81e8e35b68b2a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c20a65c exometer_core ver. 1.7.1