$ git clone -n https://src.fedoraproject.org/rpms/rubygem-spring.git /var/lib/mock/f39-build-1499418-34744/root/chroot_tmpdir/scmroot/rubygem-spring
Cloning into '/var/lib/mock/f39-build-1499418-34744/root/chroot_tmpdir/scmroot/rubygem-spring'...
$ git fetch origin ee470ee790a129d2355c708660892ad5f126ccaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-spring
 * [new ref]         ee470ee790a129d2355c708660892ad5f126ccaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee470ee Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild