libzetta-rs

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Stable interface for programmatic administration of ZFS from Rust

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> libzetta-rs is a stable interface for programmatic administration of ZFS

## Installation

Not yet. It won't break your pool or kill your brother, but API might change. Wait until 1.0.0. I have a pretty decent roadmap to 1.0.0.

## Usage

Public API for `zpool` stable. Public API for `zfs` might change after I actually get to use it in other projects. Consult the [documention](https://docs.rs/libzetta/latest/libzetta/) on usage.

### FreeBSD

This library focused on FreeBSD support. This should work on any FreeBSD version since 9.2. No intention on supporting legacy versions. Supported versions:
 - 12.1
 - 13.0 (No CI setup for it)
 
*NOTE*: FreeBSD 13.0 borked `libzfs_core` dependencies. Until it's fixed solution is to use `LD_PRELOAD` to load `libzfs_core` from ports.
*NOTE*: Since FreeBSD switched to OpenZFS, support for "legacy" will be dropped at first breakage.

### Linux

Verified on what is avaiable for Ubuntu 20.04 at the time of writting it's `0.8.3`.

## How it works

ZFS doesn't have stable API at all.`libzfs_core`(`lzc`) fills some gaps, but not entirely. While `lzc` provides stable APi to some features of zfs, there is no such thing for zpool. This library resorts to `zfs(8)` and `zpool(8)` where `lzc` falls shorts.

## Running tests

`Vagrantfile` has 3 VMS: ubuntu-20.04, FreeBSD 12 and FreeBSD 13 to use them:

- Spin up either one of those
 - Install [`just`](https://github.com/casey/just)
 - Run `just test-ubuntu` or `just test-freebsd12` to run tests in the VM
 - To run a specific test run `just test-ubuntu "-- easy_snapshot_and_bookmark"`

*NOTE*: Integration tests must be run as a root. Zpools and datasets will be created/modified/destroyed. If it wipes your system datasets that's on you for running it outside of VM.

## Nix

Project is [nix-flake](https://nixos.wiki/wiki/Flakes) enabled, but it flake itself isn't enough: you need to provide `libzfs_core` and its dependencies yourself. This is on-purpose.

## Current feature status

### zpool

|       | Create | Destroy | Get Properties | Set Properties | Scrub | Export | Import | List Available | Read Status | Add vdev | Replace Disk |
|-------|--------|---------|----------------|----------------|-------|--------|--------|----------------|-------------|----------|--------------|
| open3 | ✔      | ✔       | ✔              | ✔              | ✔     | ✔      | ✔      | ✔              | ✔¹         | ✔        | ✔            |

1. Reads the status, but api isn't stable and does poor job at reporting scrubbing status.

### zfs

#### Filesystem and ZVOL

|         | Create    | Destroy     | List     | Get Properties    | Update Properties     |
| ------- | --------- | ----------- | -------- | ----------------- | --------------------- |
| open3   | ❌        | ❌          | ✔        | ✔                 | ❌                    |
| lzc     | ✔¹        | ✔           | ❌       | ❌                | ❌                    |

1. Might not have all properties available.

#### Snapshot and bookmark

|       	|  Create 	|   Destroy 	|   List 	|  Get Properties 	|   Send 	| Recv 	|
|-------	|---------	|-----------	|--------	|-----------------	|--------	|------	|
| open3 	| ❌       	| ❌         	| ✔      	| ✔               	| ❌      	| ❌    	|
|  lzc  	| ✔¹     	| ✔         	| ❌      	| ❌               	| ✔      	| ❌    	|

1. Might not have all properties available.

## Alternatives

### https://github.com/whamcloud/rust-libzfs

Unlike them LibZetta doesn't link against private libraries of ZFS. `libzetta` also has more documention.

### https://github.com/jmesmon/rust-libzfs

LibZetta has zpool APIs. LibZetta shares `-sys` crates with this library. LibZetta also will delegate certain features of `zfs(8)` to open3 implementation.

## LICENSE

[BSD-2-Clause](LICENSE).

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