[Libguestfs] [PATCH libnbd 3/3] examples: copy-libev.c: Support extents

[Richard W.M. Jones]

On Mon, Mar 08, 2021 at 01:23:05PM +0200, Nir Soffer wrote:
> Why do we use the run script?

In this case it's optional, because libtool adds some magic to
copy/nbdcopy to ensure that it links against the built copy of libnbd
(not the installed copy).

But in general it's a useful script, for a few good reasons:

(1) You're running libnbd tools written in other programming languages
like Python.  The run script will set all the environment variables
correctly to make this just work.

(2) You want to run the nbd* tools from locally built libnbd when
doing something like running nbdkit's test suite, because the run
script sets up $PATH correctly:

  nbdkit$ ../libnbd/run make check

(3) You want to use the special features like valgrind support:

  nbdkit$ LIBNBD_VALGRIND=1 ../libnbd/run make check

See also:

  https://gitlab.com/nbdkit/libnbd/-/blob/master/run.in

Rich.

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