$ git clone -n https://src.fedoraproject.org/rpms/arb.git /var/lib/mock/f38-build-side-42-init-devel-804436-28144/root/chroot_tmpdir/scmroot/arb
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-804436-28144/root/chroot_tmpdir/scmroot/arb'...
$ git fetch origin f4059d2ce0d00cc3fb265257f56317dfde5b67e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arb
 * [new ref]         f4059d2ce0d00cc3fb265257f56317dfde5b67e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4059d2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild