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sw:yocto:bitbake:tips [2022/09/09 12:00] – niziaksw:yocto:bitbake:tips [2025/06/11 11:55] (current) – niziak
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   * [[https://stackoverflow.com/questions/51002891/overwriting-yocto-classes-through-meta-layer|Overwriting Yocto Classes through meta-layer]]   * [[https://stackoverflow.com/questions/51002891/overwriting-yocto-classes-through-meta-layer|Overwriting Yocto Classes through meta-layer]]
  
-===== MACHINEOVERRIDES =====+===== Pass env variables to bitbake =====
  
-When creatung new machine.conf based on existing one [[https://docs.yoctoproject.org/ref-manual/variables.html?highlight=machineoverrides#term-MACHINEOVERRIDES|MACHINEOVERRIDES]] can be used:+To control additional or user defined recipe's variables from env (usefull for CI) add variables to ''BB_ENV_PASSTHROUGH_ADDITIONS'': 
 +<code bash> 
 +export foo="BAR" 
 +export BB_ENV_PASSTHROUGH_ADDITIONS="${BB_ENV_PASSTHROUGH_ADDITIONS} foo BUILD_VERSION CI_COMMIT_BRANCH CI_COMMIT_SHORT_SHA" 
 +bitbake ... 
 +</code>
  
  
 +
 +
 +===== add files to rootfs =====
 +
 +''IMAGE_PREPROCESS_COMMAND += "rsync -a --exclude=.git ${FILE_SRC}/rootfs/* ${WORKDIR}/rootfs;"''
 +
 +===== override .conf =====
 +
 +No override or appends mechanism. But some workaround possible:
 +
 +  - override variables in ''local.conf''
 +  - create new conf file and inherit old one with ''require''
 +  - create new conf file with the same name to mask old file (take care of layer priority)
 +
 +===== MACHINEOVERRIDES =====
 +
 +When creatung new machine.conf based on existing one [[https://docs.yoctoproject.org/ref-manual/variables.html?highlight=machineoverrides#term-MACHINEOVERRIDES|MACHINEOVERRIDES]] can be used:
  
 [[https://github.com/Freescale/meta-freescale/blob/master/classes/machine-overrides-extender.bbclass|machine-overrides-extender.bbclass]] [[https://github.com/Freescale/meta-freescale/blob/master/classes/machine-overrides-extender.bbclass|machine-overrides-extender.bbclass]]
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 bb.debug("HELLO = %s" % HELLO) bb.debug("HELLO = %s" % HELLO)
 +
 </code> </code>
 +