$ git clone -n https://src.fedoraproject.org/rpms/xournal.git /var/lib/mock/f45-build-39054-731/root/chroot_tmpdir/scmroot/xournal
Cloning into '/var/lib/mock/f45-build-39054-731/root/chroot_tmpdir/scmroot/xournal'...
$ git fetch origin 1576df05db07960b80f688bb6b7ea01004cd31fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xournal
 * [new ref]         1576df05db07960b80f688bb6b7ea01004cd31fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1576df0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild