$ git clone -n https://src.fedoraproject.org/rpms/rubygem-curb.git /var/lib/mock/f39-build-1458187-33041/root/chroot_tmpdir/scmroot/rubygem-curb
Cloning into '/var/lib/mock/f39-build-1458187-33041/root/chroot_tmpdir/scmroot/rubygem-curb'...
$ git fetch origin 10e4ee0c6ac0c6b9baa01edab2911792659bcb86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-curb
 * [new ref]         10e4ee0c6ac0c6b9baa01edab2911792659bcb86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10e4ee0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild