$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rest-client.git /var/lib/mock/f40-build-2639300-66352/root/chroot_tmpdir/scmroot/rubygem-rest-client
Cloning into '/var/lib/mock/f40-build-2639300-66352/root/chroot_tmpdir/scmroot/rubygem-rest-client'...
$ git fetch origin 98b38a85e133730eeef6f3f2803cd37786dea6a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rest-client
 * [new ref]         98b38a85e133730eeef6f3f2803cd37786dea6a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98b38a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild