[bitbake-devel] Conditionally inherit own-mirrors and set SOURCE_MIRROR_URL?

[Richard Purdie]

On Thu, 2016-09-01 at 11:29 -0400, Evade Flow wrote:
> This might be an 'X-Y' problem, so I should explain what I'm trying
> to achieve. We have a somewhat beefy build server with 32 cores that
> most of my team likes to `ssh` into to do builds of our Yocto/OE
> -based BSP. But a few of us build on different machines often enough
> that I recently spun up a web server—on the 32-core build machine—to
> act as a 'pre-mirror' to statically serve  our dependencies for
> remote builds. The web server is serving the exact same folder that
> I've been pointing `SOURCE_MIRROR_URL` at, as described at: https://w
> iki.yoctoproject.org/wiki/How_do_I#Q:_How_do_I_create_my_own_source_d
> ownload_mirror_.3F
> 
> When I went to integrate support for the HTTP pre-mirror, I ran into
> the following problem: if I assign `SOURCE_MIRROR_URL` and the
> specified folder doesn't exist (as will be the case for remote
> builds), the build *fails*. I had hoped that bitbake would 'fall
> through' to searching other pre-mirrors, but that doesn't appear to
> be the case(?)
> 
> IIs there some way I can use a specific (and *invariant*) local
> source mirror folder *only if it exists*, and use our internal HTTP
> pre-mirror otherwise?

You could do something like:

def testislocal(d):
    if os.path.exists("xxxx")
        return "local"
 
  return ""

LOCALBUILD = "${@testislocal(d)}"

SOURCE_MIRROR_URL ?= "{@base_contains('LOCALBUILD', 'local', 'file://xxx', 'http://xxx', d)}"

I'm sure there are ways to neaten this up but you get the idea...

Cheers,

Richard