$ git clone -n https://src.fedoraproject.org/rpms/librtprocess.git /var/lib/mock/f45-build-16915-493/root/chroot_tmpdir/scmroot/librtprocess
Cloning into '/var/lib/mock/f45-build-16915-493/root/chroot_tmpdir/scmroot/librtprocess'...
$ git fetch origin f8478ec7a9445a616f871edd3ad4e378e212e3ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librtprocess
 * [new ref]         f8478ec7a9445a616f871edd3ad4e378e212e3ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8478ec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild