* Enforcing version constraints on dependencies at build-time
@ 2017-04-04 20:26 Matt Hoosier
2017-04-04 21:07 ` Burton, Ross
0 siblings, 1 reply; 2+ messages in thread
From: Matt Hoosier @ 2017-04-04 20:26 UTC (permalink / raw)
To: yocto
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The RDEPENDS variable supports giving numeric version bounds. For example:
RDEPENDS_${PN} = "foo (>= 1.3)"
That works well for getting version dependencies respected at rootfs time.
But DEPENDS (used at build-time) silently ignores any similar constraint
arguments. For example:
DEPENDS = "foo (>= 1.3)"
will not cause a recipe to be skipped if foo is present only at some
version less than 1.3.
I've tried a couple of workarounds in functions like so:
python () {
# Pseudocode. Version-number parsing would have to be done.
if d.getVar('PV_pn-foo', True) < '1.3':
raise bb.parse.SkipException('...')
}
but ${PV_pn-foo} always just evaluates to None. I think this is because of
the well-defined boundaries between instantiations of variables in one
recipe and the next.
Is there any way to escape that isolation and express version boundaries?
-Matt
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* Re: Enforcing version constraints on dependencies at build-time
2017-04-04 20:26 Enforcing version constraints on dependencies at build-time Matt Hoosier
@ 2017-04-04 21:07 ` Burton, Ross
0 siblings, 0 replies; 2+ messages in thread
From: Burton, Ross @ 2017-04-04 21:07 UTC (permalink / raw)
To: Matt Hoosier; +Cc: yocto
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On 4 April 2017 at 21:26, Matt Hoosier <matt.hoosier@gmail.com> wrote:
> Is there any way to escape that isolation and express version boundaries?
>
You're right, the recipe isolation means you can't do this from inside a
recipe's contet.
I'd like to see bitbake actually verify that the version constraints are
satisfied, and fail if they are not.
https://bugzilla.yoctoproject.org/show_bug.cgi?id=8745 is a bug talking
about this. Patches welcome...
Ross
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