[yocto] might it be worth explaining BBMASK more comprehensively?

[Robert P. J. Day]

On Wed, 12 Dec 2012, Tim Bird wrote:

> On 12/12/2012 11:27 AM, Robert P. J. Day wrote:
> >
> >   a bit more pedantry, but is there a more complete example of the use
> > of BBMASK than the trivial example in the ref and dev manuals?
> >
> >   the ref manual provides this example by way of explanation:
> >
> > BBMASK = ".*/meta-ti/recipes-misc/"
> >
> > well, ok, except you occasinally find slight variations like:
> >
> > BBMASK = "meta-ti/recipes-misc/"
> >
> > or
> >
> > BBMASK = "meta-ti/recipes-misc"
> >
> >   given that there are places where a trailing slash is significant,
> > are all of the above exactly equivalent?  if so, that's worth noting.
> >
> >   also, what about an example showing masking out a couple
> > directories, or perhaps a single recipe from a layer, and so on?  at
> > the moment, the manuals suggest you can mask multiple recipes but
> > nowhere do i see the reader being given an actual example of how to do
> > that.
>
> Indeed.  These would be good clarifications.  The manual says that
> this is a single python regular expression.  Hence, when masking multiple
> directories or recipes, you use a vertical bar to separate the regex fragments.
>
> Here's a particularly complex case I used once:
> BBMASK = "meta-ti/recipes-misc|meta-ti/recipes-ti/packagegroup"
> BBMASK .= "|.*meta-oe/recipes-support"
> #BBMASK .= "|.*openldap"
> #BBMASK .= "|.*opencv"
> #BBMASK .= "|.*lzma"
> BBMASK .= "|meta-oe/recipes-core/packagegroups"
> BBMASK .= "|meta-oe/recipes-devtools"
> BBMASK .= "|meta-oe/recipes-extended"
> BBMASK .= "|meta-oe/recipes-multimedia"
> BBMASK .= "|meta-oe/recipes-navigation"
> BBMASK .= "|meta-oe/recipes-connectivity"
> BBMASK .= "|meta-oe/recipes-graphics"
> BBMASK .= "|meta-oe/recipes-qt"
>
> I don't know if the .= with leading bar is the optimal
> way to append on to BBMASK, but it seems fairly straightforward
> to me.  I sometimes use the leading ".*" and sometimes not.

  it doesn't seem like the leading ".*" makes any difference but
that's the sort of detail that might confuse a reader and should be
explained.

> In my setup it seems to not be required, but maybe for flexibility
> it should be used.  I'm not sure -- it would depend on wheter
> python re.match or re.search is used for the regex.

>  -- Tim

from your examples above, is this how you mask individual software
recipes?

  BBMASK .= "|.*openldap"

that's kind of useful to know.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

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