[Libguestfs] [PATCH nbdkit 3/5] protocol: Generate map functions from NBD protocol flags to printable strings.

[Eric Blake]

On 12/6/18 3:50 PM, Richard W.M. Jones wrote:
> This generates small functions which map from various integer NBD
> protocol flags to the string equivalent.
> 
> eg:
>      name_of_nbd_cmd (NBD_CMD_READ)
>        ---> "NBD_CMD_READ"
> 
> This commit uses some hairy sed scripting to ensure that we don't add
> any more dependencies to nbdkit.
> ---

> +++ b/src/Makefile.am
> @@ -49,6 +49,7 @@ nbdkit_SOURCES = \
>   	options.h \
>   	plugins.c \
>   	protocol.h \
> +	protostrings.c \
>   	sockets.c \
>   	threadlocal.c \
>   	utils.c \
> @@ -77,11 +78,23 @@ nbdkit_LDFLAGS = \
>   	$(PTHREAD_LIBS) \
>   	$(DL_LDFLAGS)
>   
> +# protostrings.c is generated from the protocol.h header file where it
> +# is used to map NBD protocol flags to strings.
> +
> +BUILT_SOURCES = protostrings.c
> +EXTRA_DIST = protostrings.c
> +CLEANFILES += protostrings.c
> +protostrings.c: protocol.h protostrings.sed Makefile
> +	rm -f $@ $@-t
> +	$(SED) -n -f protostrings.sed < $< > $@-t

'make distcheck' caught a couple issues with this (we want 
protostrings.sed in the tarball, and sed can't find the script in VPATH 
builds). Now fixed.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org