$ git clone -n https://src.fedoraproject.org/rpms/rubygem-chronic.git /var/lib/mock/f45-build-34815-691/root/chroot_tmpdir/scmroot/rubygem-chronic
Cloning into '/var/lib/mock/f45-build-34815-691/root/chroot_tmpdir/scmroot/rubygem-chronic'...
$ git fetch origin 266d1b93f55eb87a79bb064444e0a524d9400e26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-chronic
 * [new ref]         266d1b93f55eb87a79bb064444e0a524d9400e26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 266d1b9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild