$ git clone -n https://src.fedoraproject.org/rpms/golang-github-prometheus-common.git /var/lib/mock/f40-build-2252415-54186/root/chroot_tmpdir/scmroot/golang-github-prometheus-common
Cloning into '/var/lib/mock/f40-build-2252415-54186/root/chroot_tmpdir/scmroot/golang-github-prometheus-common'...
$ git fetch origin d6b3731385007675506185e19289fd9201c2d2bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-prometheus-common
 * [new ref]         d6b3731385007675506185e19289fd9201c2d2bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6b3731 Update to 0.45.0 - Closes rhbz#2106454