$ git clone -n https://src.fedoraproject.org/rpms/libprometheus-cpp.git /var/lib/mock/f38-build-718578-96741/root/chroot_tmpdir/scmroot/libprometheus-cpp
Cloning into '/var/lib/mock/f38-build-718578-96741/root/chroot_tmpdir/scmroot/libprometheus-cpp'...
$ git fetch origin 0ff828fcc4852931108b5de1e618f4076c0364f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libprometheus-cpp
 * [new ref]         0ff828fcc4852931108b5de1e618f4076c0364f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ff828f Initial import (fedora#2179075).