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update for SteamOS 3.6

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sugoidogo
2026-03-18 15:29:44 -07:00
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README.md
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@@ -11,10 +11,10 @@ Once installed, you can use the `steamos-rw` command to enable, disable, or rese
## Details
The overlay data is stored in a disk image at `/home/.steamos/offload/usr.img` alongside the rest of the SteamOS offload folders.
That disk image is mounted to `/var/lib/overlays/usr` alongside the `etc` overlay folder (`var-lib-overlay-usr.mount`).
Finally, overlayfs is used the same way as SteamOS does with the `etc` overlay to enable writing to the `usr` folder (`usr.mount`), which allows you to use pacman.
Overlayfs is used the same way as SteamOS does with the `etc` overlay to enable writing to the `usr` folder (`usr.mount`), which allows you to use pacman.
Additionally, all the pre-installed packages are added to the pacman `IgnorePkg` list (`/etc/pacman.conf`) to prevent you from borking your system with a `pacman -Syu`.
Next, the default mirrorlist (`/etc/pacman.d/mirrorlist`) has to have `SigLevel = Optional TrustAll` added to work at all, thanks to valve somehow breaking package/repo signing.
After initializing the pacman keyring, `pacman-contrib` is installed to get the `paccache` service, which will help prevent pacman cache from filling up the small `/var` partition.
Since SteamOS 3.6, the pacman cache is stored on the home partition, removing the need for the paccache service, and the atomic-update config allows us to exclude steamos-rw files from being removed with updates.
To get systemd services like tailscale working, a system and user service (`overlay-units.service`) is added to issue start commands to enabled services, since they show up in the system too late for systemd to automatically start them.
Finally, `steamos-rw.target` and the `steamos-rw` command allow you to easily control the overlay.
You can also use `steamos-rw reset` to re-format the overlay disk image if you'd like to reset your installed software.