[oe] A new bitbake extension: .bbappend files

[Douglas Royds]

On 17/07/10 02:25, Richard Purdie wrote:
> Whilst our layers mechanism, is great it does have a drawback which has
> bugged me for a while. If you have a recipe like pointercal which has
> machine specific information in it and you have your new machine code in
> a layer, how do you add a pointercal file for your machine?
>
> Answer is you copy the whole pointercal recipe and files into your
> layer, then add the single file for your machine.
>    

For our overlay distro, I solved this problem as follows (in 
"conf/distro/tait.conf"):

# Compute a FILESPATHBASE that will cause the FILESPATH search string 
(for file:// URIs) to
# list tait.openembedded directories first, and org.openembedded 
directories second.
# This allows us to put a single file, eg. lighttpd.conf, into our 
tait.openembedded distribution,
# and it will be picked up by OE in preference to the deault lighttpd.conf.
# The directory containing the recipe is not necessarily the same as the 
package name.
# For instance, for lighttpd_1.2.3.bb, we want
# FILE_DIRBASENAME = lighttpd
# FILESPATHBASE = 
"/home/roydsd/Work/DBS/tait.openembedded/branches/2.6.32/recipes/lighttpd:
# 
/home/roydsd/Work/DBS/org.openembedded.dev/branches/2010-02-23/recipes/lighttpd"
# BBFILES is a space-separated list of /path/to/recipes/*/*.bb patterns.
# Split each pattern at the recipes keyword to get 
/home/roydsd/Work/DBS/tait.oe/trunk/,
# then tack on recipes/lighttpd, and
# join the whole lot together with colons
FILE_DIRBASENAME = 
"${@os.path.basename(os.path.dirname(bb.data.getVar('FILE', d)))}"
FILESPATHBASE = ${@':'.join([ pattern.split('recipes')[0] + 
'recipes/${FILE_DIRBASENAME}' for pattern in '${BBFILES}'.split() ])}

For example:

tait.openembedded/trunk/recipes/ntp/
└── files/
└── ntp.conf

BBFILES="/home/roydsd/Work/DBS/tait.openembedded/trunk/recipes/*/*.bb 
/home/roydsd/Work/DBS/org.openembedded.dev/branches/2010-02-23/recipes/*/*.bb"
FILESPATHBASE="/home/roydsd/Work/DBS/tait.openembedded/trunk/recipes/ntp:/home/roydsd/Work/DBS/org.openembedded.dev/branches/2010-02-23/recipes/ntp"

Does this achieve what you had in mind?
Douglas.
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