{
echo "== /dev =="
ls -la /dev
echo "== block =="
ls -la /dev/nvme* /dev/sd* /dev/vd* 2>&1
echo "== try read =="
head -c 64 /dev/root 2>&1 | head -c 100; echo
echo "== /proc/partitions =="
cat /proc/partitions
echo "== /sys/block =="
ls /sys/block 2>&1
} > /www/snap/dev.out 2>&1