$ git clone -n https://src.fedoraproject.org/rpms/xournalpp.git /var/lib/mock/f40-build-794021-139322/root/chroot_tmpdir/scmroot/xournalpp
Cloning into '/var/lib/mock/f40-build-794021-139322/root/chroot_tmpdir/scmroot/xournalpp'...
$ git fetch origin b351786c78b1b6b3f2f11c07bcac3c3efa7b22f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xournalpp
 * [new ref]         b351786c78b1b6b3f2f11c07bcac3c3efa7b22f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b351786 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild