$ git clone -n https://src.fedoraproject.org/rpms/xournalpp.git /var/lib/mock/f45-build-39053-731/root/chroot_tmpdir/scmroot/xournalpp
Cloning into '/var/lib/mock/f45-build-39053-731/root/chroot_tmpdir/scmroot/xournalpp'...
$ git fetch origin 72216be6bce48b747a1d94772594f70ad78d6215:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xournalpp
 * [new ref]         72216be6bce48b747a1d94772594f70ad78d6215 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72216be Update to upstream 1.3.7