I am new to Balena, and it seems like a super cool platform. But I really hope you can help me out debug this error - I have been stuck for days now.
I am trying to convert a nodejs project to Balena. It uses the rpio library. This library requires GCC support, and in the dockerfile I install this without any issues:
RUN apt-get update && apt-get install -yq \
alsa-utils libasound2-dev gcc-4.8 g++-4.8 && \
apt-get clean && rm -rf /var/lib/apt/lists/*
The dockerfile builds without any problems in local mode. However when the process then starts, I get the following error (invalid ELF header):
17:50:00 - error: uncaughtException: /usr/src/app/node_modules/rpio/build/Release/rpio.node: invalid ELF header
What can I try to fix this problem - I have now been stuck for days trying different things.
What I did to debug the issue
According to my Google searches, this is related to build architecture. I thus added the uname -a command to both the Dockerfile and a prerunner script in the nodeproject:
(Dockerfile)Linux 96cbf2e6ef3d 4.14.68 #1 SMP Tue Nov 27 09:53:28 UTC 2018 armv7l GNU/Linux
(Node Linux 2cfca32 4.14.68 #1 SMP Tue Nov 27 09:53:28 UTC 2018 armv7l GNU/Linux
But as I can tell this match pretty good. I added the following resources if needed:
Dockerfile
FROM resin/raspberrypi3-node:8
# use apt-get if you need to install dependencies,
# for instance if you need ALSA sound utils, just uncomment the lines below.
RUN apt-get update && apt-get install -yq \
alsa-utils libasound2-dev gcc-4.8 g++-4.8 && \
apt-get clean && rm -rf /var/lib/apt/lists/*
RUN update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50 && \
update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
RUN gcc --version
# Defines our working directory in container
WORKDIR /usr/src/app
# Copies the package.json first for better cache on later pushes
COPY package.json package.json
# COPY package-lock.json package-lock.json
# This install npm dependencies on the balena build server,
# making sure to clean up the artifacts it creates in order to reduce the image size.
RUN JOBS=MAX npm install --production --unsafe-perm && rm -rf /tmp/*
RUN uname -a
# This will copy all files in our root to the working directory in the container
COPY . ./
# Enable systemd init system in container
ENV INITSYSTEM on
# server.js will run when container starts up on the device
CMD ["npm", "start"]
package.json
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"setup-log": "touch logs/app.log",
"prestart": "bash ./deps.sh",
"start": "npm run -s setup-log && node skaale/index.js"
},
"dependencies": {
"cron": "^1.2.1",
"firebase-admin": "^6.4.0",
"moment": "^2.18.1",
"request": "^2.88.0",
"request-promise": "^4.2.0",
"rimraf": "^2.6.2",
"rpio": "^1.0.11",
"winston": "^2.3.1",
"winston-daily-rotate-file": "^1.4.6"
}
Full error stack
[ 'Error: /usr/src/app/node_modules/rpio/build/Release/rpio.node: invalid ELF header',
' at Object.Module._extensions..node (module.js:681:18)',
' at Module.load (module.js:565:32)',
' at tryModuleLoad (module.js:505:12)',
' at Function.Module._load (module.js:497:3)',
' at Module.require (module.js:596:17)',
' at require (internal/module.js:11:18)',
' at bindings (/usr/src/app/node_modules/bindings/bindings.js:81:44)',
' at Object.<anonymous> (/usr/src/app/node_modules/rpio/lib/rpio.js:17:34)',
' at Module._compile (module.js:652:30)',
' at Object.Module._extensions..js (module.js:663:10)',
' at Module.load (module.js:565:32)',
' at tryModuleLoad (module.js:505:12)',
' at Function.Module._load (module.js:497:3)',
' at Module.require (module.js:596:17)',
' at require (internal/module.js:11:18)',
' at Object.<anonymous> (/usr/src/app/utils/gpioHelper.js:5:12)',
' at Module._compile (module.js:652:30)',
' at Object.Module._extensions..js (module.js:663:10)',
' at Module.load (module.js:565:32)',
' at tryModuleLoad (module.js:505:12)',
' at Function.Module._load (module.js:497:3)',
' at Module.require (module.js:596:17)' ] }
, I will get back when I have results 
?