$ git clone -n https://src.fedoraproject.org/rpms/php-sebastian-environment4.git /var/lib/mock/f40-build-2632147-65846/root/chroot_tmpdir/scmroot/php-sebastian-environment4
Cloning into '/var/lib/mock/f40-build-2632147-65846/root/chroot_tmpdir/scmroot/php-sebastian-environment4'...
$ git fetch origin 46f42a4009ccf30ad50b32c2ce98328eae7f49a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-sebastian-environment4
 * [new ref]         46f42a4009ccf30ad50b32c2ce98328eae7f49a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46f42a4 update to 4.2.5 (no change)