$ git clone -n https://src.fedoraproject.org/rpms/unison.git /var/lib/mock/f42-build-865834-173538/root/chroot_tmpdir/scmroot/unison
Cloning into '/var/lib/mock/f42-build-865834-173538/root/chroot_tmpdir/scmroot/unison'...
$ git fetch origin d5380bbdd367f194cda74c9bb9152d7b5d5231c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unison
 * [new ref]         d5380bbdd367f194cda74c9bb9152d7b5d5231c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5380bb OCaml 5.3.0 rebuild for Fedora 42