User:CesarB/Using a local overlay

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A local overlay is a way to add your own bitbake recipes (or override the ones from openembedded and openmoko) without having them clobbered when you update these trees.

Contents

Creating a local overlay

To create a local overlay:

  • Create a directory for it and its subdirectories 
mkdir local local/conf local/classes local/packages
  • Copy site.conf from the openmoko tree to local/conf 
cp oe/conf/site.conf local/conf/site.conf
  • Edit the local.conf you copied to add the new tree as a source for bitbake recipes. You must change the BBFILES and BBFILE_COLLECTIONS variables and add new BBFILE_PATTERN and BBFILE_PRIORITY variables. 
BBFILES := "${OMDIR}/openembedded/packages/*/*.bb ${OMDIR}/oe/packages/*/*.bb ${OMDIR}/local/packages/*/*.bb"
BBFILE_COLLECTIONS = "upstream local overlay"
BBFILE_PATTERN_overlay = "^${OMDIR}/local/"
BBFILE_PRIORITY_overlay = "20"

The BBFILE_PRIORITY should be greater than all the other BBFILE_PRIORITY variables on the same file.

  • Change your BBPATH environment variable to add the new tree before the two others (for MokoMakefile, the variable is on the setup-env file). 
export BBPATH="${OMDIR}/build:${OMDIR}/local:${OMDIR}/oe:${OMDIR}/openembedded"

Using a local overlay

How you use the local overlay depends on which part of the tree you want to affect.

Changing files in conf/

To change a file in conf/, just copy the file to the overlay tree (preserving the directory structure) and edit it.

Changing files in classes/

To change a file in classes/, just copy the file to the overlay tree and edit it.

Changing packages

Changing a package's recipe is a bit more complex. You have to copy over (or symlink) not only the .bb file for the package, but also all the files it includes with require, and the FILESDIR directories (all directories referred to by FILESDIR, usually named either package-version or files). If you forget one of them, the build will give an error (either when parsing the recipe in the case of require, or when trying to build in the case of the FILESDIR directories).

Adding a new package

You can add a new package (or a recipe for a new version of a package) to the overlay tree simply by creating it on the overlay tree.

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A local overlay is a way to add your own bitbake recipes (or override the ones from openembedded and openmoko) without having them clobbered when you update these trees.

Creating a local overlay

To create a local overlay:

  • Create a directory for it and its subdirectories 
mkdir local local/conf local/classes local/packages
  • Copy site.conf from the openmoko tree to local/conf 
cp oe/conf/site.conf local/conf/site.conf
  • Edit the local.conf you copied to add the new tree as a source for bitbake recipes. You must change the BBFILES and BBFILE_COLLECTIONS variables and add new BBFILE_PATTERN and BBFILE_PRIORITY variables. 
BBFILES := "${OMDIR}/openembedded/packages/*/*.bb ${OMDIR}/oe/packages/*/*.bb ${OMDIR}/local/packages/*/*.bb"
BBFILE_COLLECTIONS = "upstream local overlay"
BBFILE_PATTERN_overlay = "^${OMDIR}/local/"
BBFILE_PRIORITY_overlay = "20"

The BBFILE_PRIORITY should be greater than all the other BBFILE_PRIORITY variables on the same file.

  • Change your BBPATH environment variable to add the new tree before the two others (for MokoMakefile, the variable is on the setup-env file). 
export BBPATH="${OMDIR}/build:${OMDIR}/local:${OMDIR}/oe:${OMDIR}/openembedded"

Using a local overlay

How you use the local overlay depends on which part of the tree you want to affect.

Changing files in conf/

To change a file in conf/, just copy the file to the overlay tree (preserving the directory structure) and edit it.

Changing files in classes/

To change a file in classes/, just copy the file to the overlay tree and edit it.

Changing packages

Changing a package's recipe is a bit more complex. You have to copy over (or symlink) not only the .bb file for the package, but also all the files it includes with require, and the FILESDIR directories (all directories referred to by FILESDIR, usually named either package-version or files). If you forget one of them, the build will give an error (either when parsing the recipe in the case of require, or when trying to build in the case of the FILESDIR directories).

Adding a new package

You can add a new package (or a recipe for a new version of a package) to the overlay tree simply by creating it on the overlay tree.