$ git clone -n https://src.fedoraproject.org/rpms/rubygem-snmp.git /var/lib/mock/f45-build-35339-694/root/chroot_tmpdir/scmroot/rubygem-snmp
Cloning into '/var/lib/mock/f45-build-35339-694/root/chroot_tmpdir/scmroot/rubygem-snmp'...
$ git fetch origin 888302eeb2f5d732c38e2815a76610b159aa64de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-snmp
 * [new ref]         888302eeb2f5d732c38e2815a76610b159aa64de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 888302e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild