amduat-api/notes/What works in a container.md
2026-01-17 00:19:49 +01:00

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Yes — you can absolutely do most of this inside a **Debian-based container** (or even on Linux Mint, which is Ubuntu-based), with some caveats:
---
### 1⃣ What works in a container
* **Debootstrap / building the ISO filesystem** you can create the `chroot` and populate it inside a Debian container.
* **Copying your tools** (`asl-auth-host`, `asl-rescue`, helpers) into the ISO root.
* **Overlay scripts and directory structure** fully container-compatible.
* **Generating the ISO** using `genisoimage` or `xorriso` works fine in a container.
---
### 2⃣ What **wont fully work** in a container
* **ZFS pool creation** (`zpool create`) you need **kernel support** for ZFS, and containers usually dont have full access to `/dev` to create loopback-backed pools.
* Workarounds:
* Use a **loopback file inside the container** and mount ZFS on the host after building.
* Or skip actual pool creation, just **pre-create the dataset folder structure**, and mount ZFS later on the real machine.
* **Boot testing** you can build the ISO in a container, but to actually boot and test, youll need a VM or real hardware.
---
### 3⃣ Suggested container workflow
```text
[Host Linux Mint]
|
v
[Debian container] --> run build_asl_auth_host_iso.sh
|
v
[Output ISO] --> copy to VM or USB to test boot
```
Steps:
1. Run a Debian container:
```bash
docker run -it --name asl-build -v $PWD/work:/work debian:bullseye bash
```
2. Inside the container, install required packages:
```bash
apt update
apt install -y debootstrap genisoimage squashfs-tools xorriso
```
3. Copy your scripts and binaries into the container (`/work` folder).
4. Run the ISO build script (`build_asl_auth_host_iso.sh`).
5. Copy the generated ISO back to your host for boot testing.
---
**Bottom line:**
* You **can** build the ISO entirely in a container.
* For **ZFS pools or boot testing**, you need either host privileges or a VM for full functionality.
* On Linux Mint, the container approach keeps your host clean and reproducible.
---
If you want, I can **rewrite the build script specifically for container-friendly execution**, skipping ZFS creation but keeping the dataset folders so its ready to mount ZFS later. This is the smoothest workflow for Linux Mint.
Do you want me to do that?