$ git clone -n https://src.fedoraproject.org/rpms/gnome-user-share.git /var/lib/mock/f42-build-side-1-3582839-46886/root/chroot_tmpdir/scmroot/gnome-user-share
Cloning into '/var/lib/mock/f42-build-side-1-3582839-46886/root/chroot_tmpdir/scmroot/gnome-user-share'...
$ git fetch origin ea7d32af445a58a9a39bcb4c5f6e5d54215c8d1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-user-share
 * [new ref]         ea7d32af445a58a9a39bcb4c5f6e5d54215c8d1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea7d32a Update to 48.0