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docs: add section on how to build images with trace logs #2396

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docs: add section on how to build images with trace logs #2396

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30 changes: 30 additions & 0 deletions 301.Troubleshoot/01.Yocto-project-build/docs.md
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Expand Up @@ -39,6 +39,36 @@ PREFERRED_VERSION_mender-client = "master"
<!--AUTOVERSION: "Yocto branches higher than 3.1 (%)"/ignore "Mender client % and later"/ignore-->
In Yocto branches higher than 3.1 (dunfell), Mender client 3.0.0 and later will be built by default.


## How to build an image with Mender client and connect using trace logs

This assumes you're in the build directory of your Yocto project and bitbake has been initialized.
The snippet will change the unit files for services to start them with trace level logging.


``` bash
bitbake-layers create-layer meta-mender-helpers
bitbake-layers add-layer meta-mender-helpers

mkdir -p meta-mender-helpers/recipes-helpers/mender-connect
cat > meta-mender-helpers/recipes-helpers/mender-connect/mender-connect_%.bbappend << "EOF"
do_install:append() {
sed -i "s|ExecStart=.*|ExecStart=/usr/bin/mender-connect --trace daemon|" ${D}/${systemd_unitdir}/system/mender-connect.service
}
EOF


mkdir -p meta-mender-helpers/recipes-helpers/mender-client
cat > meta-mender-helpers/recipes-helpers/mender-client/mender_%.bbappend << "EOF"
do_install:append() {
sed -i "s|ExecStart=.*|ExecStart=/usr/bin/mender-auth --log-level trace daemon|" ${D}/${systemd_unitdir}/system/mender-authd.service
sed -i "s|ExecStart=.*|ExecStart=/usr/bin/mender-update --log-level trace daemon|" ${D}/${systemd_unitdir}/system/mender-updated.service
}
EOF
```


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Optional: Maybe a short line on how to remove the layer again.


## Your project is using a fork of U-Boot which conflicts with the U-Boot Mender uses

When [Building a Mender Yocto Project image](../../05.Operating-System-updates-Yocto-Project/03.Build-for-demo/docs.md) for your own project and device, you encounter a build error similar to the following:
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