$ git clone -n https://src.fedoraproject.org/rpms/rubygem-timecop.git /var/lib/mock/f39-build-1499430-34744/root/chroot_tmpdir/scmroot/rubygem-timecop
Cloning into '/var/lib/mock/f39-build-1499430-34744/root/chroot_tmpdir/scmroot/rubygem-timecop'...
$ git fetch origin e8d719d1b1cc0ef7d74e144616720a45397f061b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-timecop
 * [new ref]         e8d719d1b1cc0ef7d74e144616720a45397f061b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8d719d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild