$ git clone -n https://src.fedoraproject.org/rpms/system-config-printer.git /var/lib/mock/f40-build-797051-141053/root/chroot_tmpdir/scmroot/system-config-printer
Cloning into '/var/lib/mock/f40-build-797051-141053/root/chroot_tmpdir/scmroot/system-config-printer'...
$ git fetch origin 9cd36a65e53b55ee0293c2c5f1e90addc6206fa3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/system-config-printer
 * [new ref]         9cd36a65e53b55ee0293c2c5f1e90addc6206fa3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9cd36a6 2259526 - FTBFS s-c-p due missing distutils