$ git clone -n https://src.fedoraproject.org/rpms/python-jsonrpclib.git /var/lib/mock/f45-build-31225-651/root/chroot_tmpdir/scmroot/python-jsonrpclib
Cloning into '/var/lib/mock/f45-build-31225-651/root/chroot_tmpdir/scmroot/python-jsonrpclib'...
$ git fetch origin 207c4ceacc0d2ad46b14b11967b5e595936e7121:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jsonrpclib
 * [new ref]         207c4ceacc0d2ad46b14b11967b5e595936e7121 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 207c4ce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild