$ git clone -n https://src.fedoraproject.org/rpms/binaryen.git /var/lib/mock/f40-build-797625-141419/root/chroot_tmpdir/scmroot/binaryen
Cloning into '/var/lib/mock/f40-build-797625-141419/root/chroot_tmpdir/scmroot/binaryen'...
$ git fetch origin 1a9dd659e71e67025275c1711c0182139595db08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/binaryen
 * [new ref]         1a9dd659e71e67025275c1711c0182139595db08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a9dd65 Merge branch 'f38' into f39