$ git clone -n https://src.fedoraproject.org/rpms/copr-messaging.git /var/lib/mock/f41-build-side-1-2811104-32926/root/chroot_tmpdir/scmroot/copr-messaging
Cloning into '/var/lib/mock/f41-build-side-1-2811104-32926/root/chroot_tmpdir/scmroot/copr-messaging'...
$ git fetch origin 5f870d21d2e6a67113263c24907073c6e48bed88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-messaging
 * [new ref]         5f870d21d2e6a67113263c24907073c6e48bed88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f870d2 Update copr-messaging to 1.0-1