$ git clone -n https://src.fedoraproject.org/rpms/sane-airscan.git /var/lib/mock/f40-build-2216081-52475/root/chroot_tmpdir/scmroot/sane-airscan
Cloning into '/var/lib/mock/f40-build-2216081-52475/root/chroot_tmpdir/scmroot/sane-airscan'...
$ git fetch origin 913879a64e0624df2f09fbdbb058ea0aa9ecb21d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sane-airscan
 * [new ref]         913879a64e0624df2f09fbdbb058ea0aa9ecb21d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 913879a fix FTBFS