$ git clone -n https://src.fedoraproject.org/rpms/rubygem-serialport.git /var/lib/mock/f40-build-777992-129691/root/chroot_tmpdir/scmroot/rubygem-serialport
Cloning into '/var/lib/mock/f40-build-777992-129691/root/chroot_tmpdir/scmroot/rubygem-serialport'...
$ git fetch origin 18696724f7e42673f05c9d5c0668953ac0a9799f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-serialport
 * [new ref]         18696724f7e42673f05c9d5c0668953ac0a9799f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1869672 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild