nbdkit inline scripts

I have proposed a patch for nbdkit, our flexible, pluggable Network Block Device server, to make writing Linux block devices into a (long) single command.

Here’s a simple block device with virtual size 1M that reads as zeroes:

nbdkit sh - <<'EOF'
    case "$1" in
        get_size) echo 1M ;;
        pread) dd if=/dev/zero count=$3 iflag=count_bytes ;;
        *) exit 2 ;;

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