Re: [ptxdist] dependencies with collections

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

On Thu, Aug 16, 2012 at 03:06:11PM +0200, Alexander Dahl wrote:
> to not use a workaround on building our BSP I'd like to have some ideas
> on a dependency problem together with collections. We use collections to
> have slightly different builds of a BSP on the same target hardware. I
> have set PTXCONF_OPENSSL=m so I can activate/deactivate it in a
> collection. In one of our make rules (lets say rules/foo.make) there are
> the following lines:
> 
> 279 # install openssl default config
> 280 ifdef PTXCONF_OPENSSL
> 281     @$(call install_copy, foo, root, root, 0644, \
> 282         $(PTXDIST_SYSROOT_TARGET)/usr/lib/ssl/openssl.cnf,
> /usr/lib/ssl/openssl.cnf)
> 283 endif
> 
> The openssl package does not install this by default. If I had special
> needs for this file I would put it in my projectroot but I don't so the
> default which comes with openssl is sufficient.
> 
> Now my problem: If I deactivate openssl in my collection, then in
> foo.make PTXCONF_OPENSSL still seems to be defined so the install_copy
> is executed, but does not find openssl.conf if openssl it was not build
> before. Actually it was not (yet?) build in this case because nothing
> else depends on it. `ptxdist install openssl` and then `ptxdist go`
> leads to installing openssl.conf although I don't need it.
> 
> I see two possible solutions at the moment from my point of view:
> 
> 1) There's a way to test in the make file if openssl is activated in
> the collection and I missed it.

ifneq ($(filter openssl,$(PACKAGES)),)
...
endif

I think. I would not recommend this. This will break if you switch
collections without rebuilding everything.
Also, you need to depend on openssl to make sure the file is already
available.

> 2) Someone™ adapts the openssl package to make it possible to choose
> between installing the generic openssl.conf or her own copy from
> projectroot.

install_alternative should looks in pkgdir if nothing is found in
projectroot etc.

> 3) The third even more elegant solution I missed.

Create a separate package that selects openssl and is enabled/disabled with
it on the collectionconfig.

Michael

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