$ git clone -n https://src.fedoraproject.org/rpms/paho-cpp.git /var/lib/mock/f45-build-21309-583/root/chroot_tmpdir/scmroot/paho-cpp
Cloning into '/var/lib/mock/f45-build-21309-583/root/chroot_tmpdir/scmroot/paho-cpp'...
$ git fetch origin d97fd2c5ea5db64bf2b5cb15d76cf7148467ec00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/paho-cpp
 * [new ref]         d97fd2c5ea5db64bf2b5cb15d76cf7148467ec00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d97fd2c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild