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docs: require overlay storage driver for bootc switch #21

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19 changes: 19 additions & 0 deletions docs/laptop-bootc-architecture.md
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Expand Up @@ -43,6 +43,25 @@ flowchart TD
an internal kernel-command-line crate rename.
- Secure Boot must remain disabled until a signed Arch UKI workflow is added.

## Host prerequisites

- `/etc/containers/storage.conf` must explicitly set `driver = "overlay"`:
```toml
[storage]
driver = "overlay"
```
Without it, a fresh `bootc switch` can fail with:
```
ERRO[0000] User-selected graph driver "overlay" overwritten by graph
driver "vfs" from database - delete libpod local files
("/run/bootc/storage") to resolve.
```
`/run/bootc/storage` is bootc's own ephemeral staging store for the image
it is about to switch to, kept on tmpfs. Deleting that directory alone does
not fix it, since the driver decision is re-derived on the next invocation;
the host-wide storage driver must be pinned explicitly at the `/etc`
level, which overrides every other `storage.conf` on the system.

## Image policy

- Official Arch packages by default for the operating system and desktop.
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