The ubuntu CI image build (job 103277644636) hung on Canonical's
archive: apt fetched 26 MB at 417 kB/s, then 61.6 kB in 29 s, then sat
on the package download until the job was cancelled after 23 minutes,
while download.docker.com delivered 42.8 MB in under a second on the
same runner. Locally archive.ubuntu.com and security.ubuntu.com took
20-26 s to the first byte against 2 s for a university mirror.
INFINITO_APT_UBUNTU_MIRRORS in default.env is now the one list of
Ubuntu mirrors, in failover order: de.archive.ubuntu.com, ftp.fau.de,
ftp.halifax.rwth-aachen.de, archive.ubuntu.com.
- Image builds: the Dockerfile sources the list alongside the install
scripts and runs scripts/install/apt-mirrors.sh first. In an image
with ubuntu.sources it points both stanzas at apt's mirror+file
method, priorities in list order, and sets Acquire::http::Timeout to
10 s, so apt moves on from a mirror that fails or goes silent; other
distros are untouched. In ubuntu:latest apt-get update took 8 s
against 110 s on the stock sources, a dead first mirror was left
behind within 25 s against 62 s on apt's defaults, and the swarm node
packages (80 debs) came in 17 s. The Dockerfile's own RUN lines ran
clean on ubuntu, debian, fedora and arch.
- Package cache: package.sh proxies the first entry as the primary
Ubuntu repos and the second as their fallback. Nexus revalidates
metadata on every request here (metadataMaxAge 0), which costs a
full download from a mirror without an ETag; both de.archive and
ftp.fau.de send one, and the 15 MB universe index now comes back
from the cache in 0.02 s.
- tests/external/repository/test_apt_ubuntu_mirrors.py keeps the list
honest: the first mirror must answer InRelease within 5 s (median of
three) or the test names a faster later one, no mirror's -updates may
lag the freshest by more than 24 h, and every entry must be the
primary archive, a Canonical country alias or an enabled official
mirror in Launchpad's registry. It caught the first draft of the
list: mirrors.edge.kernel.org is not an official Ubuntu mirror.
After pulling, an existing checkout needs `make dotenv-force`: plain
`make dotenv` re-reads the old .env through BASH_ENV and keeps its
values.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The pick was made once per matrix entry, in a workflow step ahead of the drill,
and every distro of that entry then ran on it. Coverage followed: one entry
exercised one filesystem, and the swarm never reached zfs at all, because
resolve.sh's userland_for() kept it out of any entry containing arch, centos or
fedora - which is every automatic sweep. The draw now happens inside the loop in
distros.sh, once per distro, so a five-distro entry covers zfs with 87% and all
three kinds with 62% probability instead of one kind with certainty.
The workflow input changes meaning with it. It was a single kind, offered as a
choice in the manual entry; it is now a space-separated allow-list. Empty draws
from all three, and naming kinds narrows the draw to them and marks the pick
required, so a host that cannot deliver one of them fails rather than quietly
running on something else. A name that is not a filesystem this project puts a
data root on is rejected outright instead of reaching the applying step.
For the draw to mean anything the images have to carry the userlands, so
scripts/install/zfs.sh becomes scripts/install/filesystem.sh and installs ext4
and btrfs alongside zfs. That is not symmetric work: btrfs-progs does not exist
in the EL family at all, because RHEL dropped btrfs, and a plain
`dnf install btrfs-progs` there fails the whole transaction and takes e2fsprogs
with it. EPEL carries it, so the EL family goes through EPEL from the start -
split by distro rather than by a failed first attempt, since Fedora has no
epel-release to fall back to and routing a transient failure there would turn it
into a fatal one. verify() now demands all four binaries, so a packaging
regression fails the build instead of leaving a hole the drill discovers later.
Measured on all five bases: debian trixie, ubuntu 26.04, arch, fedora 44 and
centos 10 each end with mkfs.ext4, mkfs.btrfs, zfs and zpool present and ldd
fully resolved.
Two defects only became reachable once a single job could ask for different
filesystems in turn:
* docker_dataroot.sh answered "already prepared" and returned for any mount it
found, so from the second distro on, every draw would have been silently
ignored on a host that survives the sweep - the runner in compose and host
mode. It now compares what is mounted against what was asked for and
dismantles the old root when they differ. Everything docker cached there
goes with it; that is what covering more than one filesystem per entry
costs.
* reclaim_stale_pool ran only when the new pick was zfs, so a zfs to btrfs
transition left the previous distro's pool imported on the shared kernel,
pinning a loop device over an image its dead container had already unlinked.
It now runs on every pick, which needed the /dev/zfs handling lifted out of
the zfs branch into zfs_device_ready().
The restore_docker trap is armed before anything can stop docker, rather than
after, so a failure while dismantling a data root cannot leave a host without a
daemon. resolve.sh splits its allow-list into an array before testing it, so a
whitespace-only input is the empty list it looks like rather than a narrowed one
that yields an empty pick marked required. pick.sh clears both keys when it
declines to draw: they are declared in default.env, so a generated .env carries
whatever was exported when it was made, and a caller gating its apply on the
value would otherwise repoint the developer's own docker in the very case the
skip exists to prevent.
Verified by execution rather than by reading: a privileged container ran
docker_dataroot.sh with real loop devices and mkfs through ext4 -> ext4 -> btrfs
-> ext4, confirming the recognition, the replacement in both directions and that
no loop leaks across it; a second harness with a recording zpool stub confirmed
that a btrfs pick does reclaim a stale pool, that no pool means no destroy, and
that a host without /dev/zfs still completes an ext4 pick without touching zpool.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
dockerd's zfs graphdriver resolves `zfs` on PATH and opens /dev/zfs before it
accepts a data root (moby daemon/graphdriver/zfs/zfs.go:54,59), so the userland
has to sit in the image, not on the host. Only the apt images carried it, which
is why resolve.sh's userland_for() kept zfs out of every entry containing arch,
centos or fedora - that is every automatic swarm sweep, so the zfs data root and
the zfs branch of the backup launcher were never once exercised. Run
30781723102 shows it: "zfs left out: not every distro of this entry carries the
userland".
scripts/install/zfs.sh joins the three existing install scripts in the image
build and takes a different route per distro, each one run in a real container
of the matching base image before landing here:
debian trixie 2.3.2 zfsutils-linux, contrib enabled first
ubuntu 26.04 2.4.1 zfsutils-linux
arch 2.4.3 the AUR PKGBUILD, which configures --with-config=user
fedora 44 2.4.3 zfsonlinux repo plus a dummy zfs-kmod provider
centos 10 2.2.10 the same, from the epel path
The dummy is what keeps the RPM route usable: the `zfs` package carries an
ungated `Requires: %{name}-kmod`, so a plain `dnf install zfs` resolves through
zfs-dkms and installs 389 extra packages and 1.44 GB of kernel and toolchain to
build a module against a kernel the container never boots. Providing zfs-kmod
from an empty package keeps the same install at 60 packages with no kernel
package at all, and the transaction is checked afterwards so a regression fails
the build instead of bloating the image. The repository is removed again once
the userland is in, because the dummy pins one version and an upgrade would
otherwise re-resolve the kmod at deploy time.
Version drift against the host module is not a concern: zpool create enables a
feature only when the loaded module reports it through /sys/module/zfs/features
.pool (cmd/zpool/zpool_main.c, module/zcommon/zfeature_common.c), and libzfs
compares no versions at all (lib/libzfs/os/linux/libzfs_util_os.c:123-134), so a
newer userland degrades rather than breaking.
With every image carrying it, userland_for() and every_distro_carries() have
nothing left to decide and go. Two defects that only became reachable once zfs
could be drawn are fixed in the same move:
* /dev/zfs is a misc device, so the old lookup in /proc/devices could never
find its major and the node was never created. A node container's /dev is
populated at creation and udevd is masked, so nothing else fills the gap
either: the first bring-up of every job would have declined, blaming a
module that modprobe had just loaded. The minor now comes from /proc/misc.
* Pools live in the kernel the lab nodes share with the runner, while the
teardown only removes containers, and the node hostnames repeat across the
distro sweep. From the second distro on, zpool create hit the previous
iteration's pool. It is destroyed and its loop detached first.
The node image drops its own apt-only zfs branch and instead masks the six boot
units the userland enables by preset, which on a node can only fail: the pool is
created after boot.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Three classes of drift cleaned up across 85 .md files:
- Em-dashes: replaced ` — ` with the contextually correct separator
(colon for `term: explanation`, period to split clauses across
sentences/source lines, parentheses for asides, semicolon for
tight-linked continuations). Two intentional exceptions remain
in `docs/contributing/documentation.md` (the rule literal) and
inside a fenced ```sh block in `docs/contributing/actions/debugging/ci.md`.
- SPOT self-labels: rewrote "This is the SPOT for X" to describe
the subject directly ("This directory holds X" / "This file
describes X"). Cross-references to other artefacts' canonical
role remain unchanged.
- Heading-emoji position: moved leading-emoji headings (`# 🧩 Title`)
to trailing position (`# Title 🧩`) per the headline rule that
emojis MUST come after the title text.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds scripts/install/sandbox.sh, a distro-aware installer for the OS-level
dependencies the Claude Code sandbox backend needs (bubblewrap, socat),
and exposes it through a new `make agent-install` target. Documents the
target in docs/contributing/tools/make.md, scripts/install/README.md, and
the Claude sandbox guide so contributors on a fresh host can bring up a
working sandbox without hand-installing distro packages.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
kevinveenbirkenbachandClaude Opus 5
Environment TestandClaude Opus 4.6