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smallwebwaf/docs/image.md
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The image creates SWW_STATE_DIR when it is missing (closes #337)
Before `waf` starts, the image's `run` script now makes `SWW_STATE_DIR` if it is missing (`mkdir -p`), gives it to `sww:sww` and sets its mode to `0700`, as it already does for the cache directory's owner. A value that is not an absolute path, or an unreadable `SWW_STATE_DIR_FILE`, still changes nothing, and `waf` stops naming the setting. The `Dockerfile` comment, `docs/image.md`, `docs/settings.md` and `SPEC.md` say the image makes the directory. `script/example-app` checks that a missing `SWW_STATE_DIR` is made, owned by `sww` with mode `0700`.

- `chmod 0700` also applies to an existing directory, a mounted volume included, at every start of `waf`.

Model: opus-5-5
2026-11-11 11:33:08 +01:00

1.6 KiB

What the image holds

The contents of the smallwebwaf image, and how each part is pinned. The image runs rproxy by default, or waf with SWW_COMMAND=waf. "Deployment" in SPEC.md says why each part is there and why it is pinned that way.

Contents

  • Ubuntu 26.04 LTS, pinned by digest.
  • ca-certificates, nix-bin and runit from Ubuntu's archive.
  • Nix, with nixpkgs nixos-26.05.11045.774debe7a0d1 set up for root as nixpkgs. No Nix daemon; build-users-group = in /etc/nix/nix.conf. Root's Nix profile, /nix/var/nix/profiles/default/bin, last on the PATH. Unpacked, nixpkgs takes about 500 MiB.
  • runsvinit as the entrypoint, built from github.com/peterbourgon/runsvinit at a fixed commit hash.
  • The sww binary, and the user sww (uid and gid 65532).
  • The service directory /etc/service/sww, with the run script share/sww.run.
  • /var/lib/sww for waf's state files, and /etc/sww/rules.d with the default rule file share/rules.d/00-default.rules. The run script makes SWW_STATE_DIR when it is missing.
  • EXPOSE 8080, and the HEALTHCHECK that runs sww healthcheck.

Pins

  • Ubuntu's packages are not pinned: they come from the live archive, whose packages change with every update.
  • nixpkgs: the release file nixexprs.tar.xz of nixos-26.05.11045.774debe7a0d1 on releases.nixos.org, named with its SHA-256 hash.
  • runsvinit: the archived repository, unchanged since 2015, at its last commit (b4b2c78, eight commits after v2.0.0), by commit hash, with a go.mod the build writes.
  • The Go image that builds sww: by digest.