Rebuilderd

Rebuilderd は、バイナリパッケージの独立した検証システムです。同一の環境でビルド手順を繰り返すことにより、プリコンパイルされたパッケージを検証し、パッケージが同一であることを検証できます。現在、検証できるのは ArchLinux パッケージのみです。

ノート: rebuilderd はまだ実験的なものであり、多くのビルドがまだ再現できていません。リビルドに失敗しても、そのパッケージが悪意のある物とは限りません。

再構築機能を実行する場合、または再構築機能の実行を検討している場合は、[1] IRC チャネルに参加してください。

インストール

rebuilderd パッケージをインストールして下さい。

セットアップ

単一のマシン

単一のマシンでは、ただ rebuilderd.service とワーカーサービスを 有効化 するだけです。rebuilderd-worker@workername.service を有効にします。

その後、rebuilderd が単一のワーカーで正しく動作していることを確認するには、次のように実行します。

# rebuildctl status

認証クッキーが見つからないというエラーが出た場合は、自分を rebuilderd に追加する必要があるかもしれません。ユーザグループ に追加する必要があるかもしれません。

次のセクションに進んで、ワーカーがリビルドできるようにパッケージを同期してください。

Multi-node rebuilder setup

To run a multi-node rebuilder network we need at least two servers:

• rebuilderd daemon - This one only needs very few resources (a CX11 instance is fine), it keeps track of all packages, coordinates the workers and serves results to clients. This daemon should be setup with https.
• rebuilderd worker - This server runs the actual builds. This server should have at least 16GB ram, if you want to build all packages this should be closer to 32GB.

The worker needs to authenticate itself to the daemon with a secret signup key (worker.signup_secret). This key can be generated with pwgen -1s 32.

You can also generate a second secret to use rebuildctl remotely (auth.cookie). This is optional, you can also run rebuildctl on the server after adding yourself to the rebuilderd group.

/etc/rebuilderd.conf

## Configuration for http daemon
[http]
## The address to bind to. This is 127.0.0.1:8484 by default.
bind_addr = "0.0.0.0:8484"
## If you use a reverse proxy, use this header instead of the actual connecting ip.
## Make sure the reverse proxy has filters in place to prevent spoofing issues.
#real_ip_header = "X-Real-IP"
## Set a default endpoint for rebuildctl. This is especially useful for the sync timer.
#endpoint = "http://127.0.0.1:8484"

## A random cookie for administration is generated at startup and written to /var/lib/rebuilderd/auth-cookie
## You can set this to a fixed value here. Use `pwgen -1s 32` to generate one.
## rebuildctl is searching for this cookie in ~/.config/rebuilderd.conf, /etc/rebuilderd.conf and
## /var/lib/rebuilderd/auth-cookie in that order.
#[auth]
#cookie = "INSECURE"

## The auth cookie above is only used for the default endpoint.
## You can use different endpoints with `rebuildctl -H https://rebuilder.example.com status`,
## In that case you need to configure a section below if you want to attach a cookie.
#[endpoints."https://rebuilder.example.com"]
#cookie = "INSECURE"

## IMPORTANT: in production, make sure either `authorized_workers` or `signup_secret` is configured.
[worker]
## If we have a fixed set of workers we can allow-list the keys here.
#authorized_workers = ["key1", "key2"]
## If we want to spawn new workers dynamically we can configure a sign up secret below.
## Use `pwgen -1s 32` to generate one.
signup_secret = "INSECURE"

#[schedule]
## Configure the delay to automatically retry failed rebuilds in hours. The
## default is 24h, this base is multiplied with the number of rebuilds, so the
## first retry would happen after 24h, the second retry would happen 48h after the
## first retry and the third retry would happen 72h after the second retry. There
## is no upper limit of retries, if you can't afford frequent retries it's
## recommended to set this to a high value like 168 (1 week) or higher.
## Successful rebuilds are not retried.
#retry_delay_base = 24

Start and enable rebuilderd.service.

Next we head over to our worker machines to set them up. Install rebuilderd as well and edit /etc/rebuilderd-worker.conf:

/etc/rebuilderd-worker.conf

## The rebuilderd to connect to
endpoint = "https://rebuilder.example.com" # or http://rebuilder.example.com:8484
## The server would either allowlist our key or require a signup secret
signup_secret = "INSECURE-CHANGE-ME"

[build]
#timeout = 86400 # 24 hours
## Set a maximum build log limit in bytes (default: none).
## When reaching this limit the log is truncated but the rebuilder backend is *not* terminated.
max_bytes = 10485760 # 10 MiB
## By default build output is forwarded to stdout/stderr.
## This can be disabled by settings this to true.
#silent = true

[diffoscope]
## Generate and attach diffs with diffoscope when rebuilding
enabled = true
## Pass additional arguments to diffoscope. Use wisely, some options might not work well.
#args = ["--max-container-depth", "2", "--fuzzy-threshold", "0"]
## Set a timeout in seconds after which diffoscope is terminated (default: 3600)
#timeout = 600 # 10 minutes
## Set a maximum diffoscope output limit in bytes (default: none).
## When reaching this limit, diffoscope is terminated and the output is truncated.
max_bytes = 41943040 # 40 MiB

We can start the worker unit multiple times for concurrent rebuilds (if the machine has enough resources). We are going to start with just one worker (and call it 0) by starting/enabling rebuilderd-worker@0.service

Syncing packages to rebuild

The rebuilder setup will not do anything by default until you explicitly configure where to sync packages from. The sync profiles are configured in /etc/rebuilderd-sync.conf. The profile names are supposed to be unique. You configure it to only build packages of a specific maintainer with the maintainer option. By default it is importing packages of all maintainers.

## rebuild all of core
[profile."archlinux-core"]
distro = "archlinux"
suite = "core"
architecture = "x86_64"
source = "https://ftp.halifax.rwth-aachen.de/archlinux/$repo/os/$arch"

## rebuild community packages of specific maintainers, or whitelist packages by name.
## If no filter is set, all packages are imported, if both filters are set the package only
## has to match one of them to be included.
#[profile."archlinux-community"]
#distro = "archlinux"
#suite = "community"
#architecture = "x86_64"
#source = "https://ftp.halifax.rwth-aachen.de/archlinux/$repo/os/$arch"
#maintainers = ["somebody"]
#pkgs = ["some-pkg", "python-*"]
#excludes = ["tensorflow*"]

Afterwards you can enable rebuilderd-sync@archlinux-core.timer to automatically sync the profile.

Ansible playbook

An Ansible playbook with a rebuilderd role can be found in Arch Linux's infastructure repository. Use this as inspiration as the Ansible repository is heavily dependent on how the Arch Linux infrastructure is set up.

Tips and tricks

Requeueing failed builds

Starting with rebuilderd 0.5.0 failed builds are retried automatically with increasing delays. You can retry packages immediately with:

# rebuildctl pkgs requeue --suite core --status BAD

In older versions you had to use this command to add all failed builds to the queue again:

# rebuildctl pkgs ls --distro archlinux --suite core --status BAD --json | jq -r '.[].name' | xargs -L1 rebuildctl queue push archlinux core

Package rebuilders

Rebuilders using Rebuilderd.

URL	Contact	Comment
https://reproducible.archlinux.org/	jelle
https://wolfpit.net/rebuild/	wahrwolf
https://r-b.engineering.nyu.edu/	NYU Secure Systems Lab