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docs: Add note on RuntimeBuildSources= to hacking guide

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Daan De Meyer 2024-04-08 12:14:47 +02:00 committed by Luca Boccassi
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docs/HACKING.md
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@ -82,6 +82,21 @@ to `mkosi.local.conf`:
QemuFirmware=uefi
```
To avoid having to build a new image all the time when iterating on a patch, add
the following to `mkosi.local.conf`:
```conf
[Host]
RuntimeBuildSources=yes
```
After enabling this setting, the source and build directories will be mounted to
`/work/src` and `/work/build` respectively when booting the image as a container
or virtual machine. To build the latest changes and re-install, run
`meson install -C /work/build --only-changed` in the container or virtual machine
and optionally restart the daemon(s) you're working on using
`systemctl restart <units>` or `systemctl daemon-reexec` if you're working on pid1.
Putting this all together, here's a series of commands for preparing a patch
for systemd: