$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gem2rpm.git /var/lib/mock/f40-build-2033727-47836/root/chroot_tmpdir/scmroot/rubygem-gem2rpm
Cloning into '/var/lib/mock/f40-build-2033727-47836/root/chroot_tmpdir/scmroot/rubygem-gem2rpm'...
$ git fetch origin 7e010c63e180bd143a48af641da483c254bf4799:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gem2rpm
 * [new ref]         7e010c63e180bd143a48af641da483c254bf4799 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e010c6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild