Tips and tricks
SSH Config
When postmarketOS is reinstalled, a new ssh host key will be generated. Your SSH client will detect this, and refuse to connect, requiring you to run ssh-keygen -R 172.16.42.1
each time a new host key is generated.
To disable this check, and to allow you to connect by running ssh postmarketos
, add the following to your ~/.ssh/config
:
Host postmarketos HostName 172.16.42.1 StrictHostKeyChecking no UserKnownHostsFile=/dev/null
Warning: Ignoring host keys could leave you vulnerable to a Man-in-the-middle attack |
Some interesting ideas
Here are some interesting ideas that you can do with your device with postmarketOS
- Use it as a mini retro handheld gaming device. As there are many good retro emulator that ccan make your device one great gaming device.
- Use it as a mini penetration testing device. As postmarketOS is a pure linux os, you can run Wireshark and other penetration testing software with it.
- You can run full Desktop Environment, with Inkscape, GIMP and full desktop browser(not mobile version) with extension in your device, .
VNC connection
Using x11vnc, which is in the Alpine repos. You need a running X server (e.g. running XFCE), then you just run x11vnc on the device in a terminal/tty and connect to it. From there, you can manipulate the previously running X server. You might need to specify the X server if x11vnc does not detect it (e.g. by passing -display :0 to it or doing a export DISPLAY=:0 before running it, assuming the display is at :0)
Update the architecture of your device
Some devices have the armhf-architecture but the device supports armv7. Some Interfaces can not be built for armhf, so it could be useful to update the architecture:
- Update the architecture in the following files:
device/device-samsung-foo/APKBUILD
device/device-samsung-foo/deviceinfo
device/linux-samsung-foo/APKBUILD
- Update the name of the config-wiki-example.armhf in device/linux-wiki-example
- Create new Checksums, build the kernel and boot.
Due to CI-Updates in the Gitlab-repository it may be necessary to also modernize your aport before you can upstream your work.
Misc
- The splash screen is highly configurable (scroll down for an example)!
- Browse the Linux source with links to all references here
- Qualcomm and maybe some other Androids can simply reboot from postmarketOS (or any Linux distro) into your bootloader or recovery with
reboot -f bootloader
andreboot -f recovery
- Battery capacity can be monitored to trigger low battery actions. See Battery capacity monitoring for more information.
Copy a port
If you know a port of another device is working on your device too, you can copy the port.
Arguments for copying a port:
- You cannot make your device booting yourself or want to safe the time to do it.
- There are no kernel sources available for your device
- The devices are very similar (e.g. same SoC), but you need little adjustments
Keep in mind that if you copy a port you always copy all problems and bugs too. For example it can be better to create a new up-to-date port then copying a port which only compiles under gcc6 and still uses armhf.
If you want to copy the port of a device, copy all the files of the device in your device-folder and rename them to the new ones. Now simply follow the porting guide. If the config-file of your new device is available try to use it instead of the old one.