$ git clone -n https://src.fedoraproject.org/rpms/unar.git /var/lib/mock/f40-build-780180-130701/root/chroot_tmpdir/scmroot/unar
Cloning into '/var/lib/mock/f40-build-780180-130701/root/chroot_tmpdir/scmroot/unar'...
$ git fetch origin d6607b3019c5c207634b95cb7c83448c3300c2c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unar
 * [new ref]         d6607b3019c5c207634b95cb7c83448c3300c2c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6607b3 Rebuild for ICU 74