AT_TAR_CHECK([
genfile --file foo --length 50000k
genfile --file baz
-genfile --run 'tar -H pax -vcf bar foo baz' --checkpoint 10 --length 49995k --truncate foo
+genfile --run 'tar -vcf bar foo baz' --checkpoint 10 --length 49995k --truncate foo
echo separator
sleep 1
dd if=/dev/zero of=foo bs=1k seek=49995 count=5 >/dev/null 2>&1