Create 4GB swapfile on external storage

[lukechilds]

Resolves #104

Bind mount /mnt/data/swap on external storage to /swap and create 4GB swapfile at /swap/swapfile.

[lukechilds]

I've tested this and it's working for me.

You can test the entire update process with:

sudo mkdir /umbrel
sudo chown umbrel:umbrel /umbrel
git clone --branch swap https://github.com/lukechilds/umbrel.git /umbrel
sudo ~/umbrel/scripts/update/update --path /umbrel

After the next reboot you should have a 4GB swap file at /swap/swapfile which is bind mounted to external storage and the dphys-swapfile dep should be removed.

Do you think we should create the new swapfile on the fly after OTA update so users don't need to reboot to get access to swap?

[mayankchhabra]

Looks great, @lukechilds! Super-sleek. Will test it out now.

Do you think we should create the new swapfile on the fly after OTA update so users don't need to reboot to get access to swap?

Yeah, that sounds like a great idea!

[mayankchhabra]

The 4GB swap was created successfully with no problems in my testing! Although it looks like it didn't remove dphys-swapfile for some reason (hence the total swap size is 4.1G instead of 4.0G because of the existing 100mb swapfile):

umbrel@umbrel-testnet:~ $ free -h
              total        used        free      shared  buff/cache   available
Mem:          7.6Gi       881Mi       5.9Gi       8.0Mi       932Mi       6.7Gi
Swap:         4.1Gi          0B       4.1Gi
umbrel@umbrel-testnet:~ $ dphys-swapfile
Usage: /sbin/dphys-swapfile {setup|swapon|swapoff|uninstall}

[lukechilds]

Although it looks like it didn't remove dphys-swapfile for some reason

Do you still have the dphys-swapfile binary available?

[mayankchhabra]

Yep, it looks like so:

umbrel@umbrel-testnet:~ $ dphys-swapfile
Usage: /sbin/dphys-swapfile {setup|swapon|swapoff|uninstall}
umbrel@umbrel-testnet:~ $ ls /sbin/dphys-swapfile 
/sbin/dphys-swapfile

[mayankchhabra]

Lol also didn't realize your branch was at v0.2.2. The update process changed my installation from v0.2.3 to v0.2.2. A good stress test regardless haha!

[lukechilds]

Lol also didn't realize your branch was at v0.2.2. The update process changed my installation from v0.2.3 to v0.2.2. A good stress test regardless haha!

Oops, like like I forget to fetch upstream before I branched off.

Yeah update --path does no version checks, it just blindly executes the update scripts. This is quite useful for dev so you can repeatedly re-install your branch over itself while testing.

[lukechilds]

@mayankchhabra I've made the suggested amendments.

If you re-install based on this and make sure you remove swapfile/bindmount and re-install adn enable dphys-swapfile you should see everything is uninstalled/re-created after update.

[mayankchhabra]

Tested and everything looks great, @lukechilds! Awesome work here. Let's release this tomorrow 🚀

umbrel@umbrel-testnet:~ $ dphys-swapfile
-bash: dphys-swapfile: command not found
umbrel@umbrel-testnet:~ $ free -h
              total        used        free      shared  buff/cache   available
Mem:          7.6Gi       384Mi       6.9Gi       8.0Mi       376Mi       7.1Gi
Swap:         4.0Gi          0B       4.0Gi