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- Subject: nbdkit Lua binding
- From: "Richard W.M. Jones" <rjones@...>
- Date: Sat, 7 Jul 2018 19:10:36 +0100
nbdkit is a pluggable Network Block Device (NBD) server. We allow
people to write plugins using various scripting languages.
I wrote Lua bindings for nbdkit yesterday:
I've only tested them lightly, and there are bound to be some bugs.
If anyone has any comments about the code style / naturalness of the
Lua bindings / horrible bugs then I'd be pleased to get feedback
(please CC me).
Some issues I had:
- Is there a mutable string / buffer type in the standard library?
(see https://github.com/libguestfs/nbdkit/blob/dfa6f5b580b6436d0742cc2e072bce0fbdc43b77/tests/test.lua#L22 )
- Error messages generated by Lua are very nice and easy to read.
- Is lua_Integer guaranteed to be >= 64 bit even on 32 bit platforms?
(see awkward code here: https://github.com/libguestfs/nbdkit/blob/dfa6f5b580b6436d0742cc2e072bce0fbdc43b77/plugins/lua/lua.c#L227 )
- io.open (...,"rb+") does not work, but "r+b" works. Even worse
"rb+" doesn't seem to give an error, it just fails when I try to
write to the handle. That was the thing which took me longest to
- strings in Lua code indexed from 1 ... zaaarghhh :-(
I've implemented nbdkit bindings for 6 non-C languages and Lua has
certainly been one of the nicer ones to deal with, once you get used
to how the stack works.
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
libguestfs lets you edit virtual machines. Supports shell scripting,
bindings from many languages. http://libguestfs.org