$ git clone -n https://src.fedoraproject.org/rpms/unar.git /var/lib/mock/f42-build-862680-171015/root/chroot_tmpdir/scmroot/unar
Cloning into '/var/lib/mock/f42-build-862680-171015/root/chroot_tmpdir/scmroot/unar'...
$ git fetch origin ef582140201c5925fe5c7188e00dede3f4e1358e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unar
 * [new ref]         ef582140201c5925fe5c7188e00dede3f4e1358e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef58214 Rebuild for ICU 76