$ git clone -n https://src.fedoraproject.org/rpms/php-sebastian-diff6.git /var/lib/mock/f45-build-28373-629/root/chroot_tmpdir/scmroot/php-sebastian-diff6
Cloning into '/var/lib/mock/f45-build-28373-629/root/chroot_tmpdir/scmroot/php-sebastian-diff6'...
$ git fetch origin 49a0f25a9ecc15082576601dfd2f5200a7086918:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-sebastian-diff6
 * [new ref]         49a0f25a9ecc15082576601dfd2f5200a7086918 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49a0f25 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild