# BUGFIX: Missing disk tools (sfdisk, mkfs.ext4, etc.)

## Problem
`sfdisk` not found in container PATH → partitioning fails.

## Required packages

### In the controller Dockerfile (container image)
```dockerfile
RUN apt-get update && apt-get install -y --no-install-recommends \
    fdisk \
    e2fsprogs \
    mount \
    && rm -rf /var/lib/apt/lists/*
```

Provides:
- `fdisk` package → `sfdisk`, `fdisk`, `cfdisk`
- `e2fsprogs` package → `mkfs.ext4`, `e2fsck`, `tune2fs`
- `mount` package → `mount`, `umount`, `blkid`, `findmnt`, `lsblk`

**Note:** `util-linux` (which provides `lsblk`, `blkid`, `mount`) is likely already installed as a base dependency. Check with `docker exec felhom-controller which lsblk` — if it exists, skip `mount` package. The critical missing ones are `fdisk` and `e2fsprogs`.

### On the host node (docker-setup.sh)
These should already exist on a standard Debian 13 install, but ensure:
```bash
apt-get install -y fdisk e2fsprogs util-linux
```

Add to docker-setup.sh's dependency installation section if not already there. The host needs these for `mount -a` (fstab reload) and as fallback.

## Quick verification after rebuild
```bash
docker exec felhom-controller which sfdisk mkfs.ext4 blkid mount lsblk
# Should show paths for all five
```