chore(nixery): Housekeeping for depot compatibility

Cleans up a whole bunch of things I wanted to get out of the door right away: * depot internal references to //third_party/nixery have been replaced with //tools/nixery * cleaned up files from Github * fixed SPDX & Copyright headers * code formatting and inclusion in //tools/depotfmt checks Change-Id: Iea79f0fdf3aa04f71741d4f4032f88605ae415bb Reviewed-on: https://cl.tvl.fyi/c/depot/+/5486 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: tazjin <tazjin@tvl.su>
2022-04-20 16:41:20 +02:00 · 2022-04-20 16:41:20 +02:00 · 6716bf018c
commit 6716bf018c
parent 535ad8732a
32 changed files with 192 additions and 478 deletions
--- a/README.md
+++ b/README.md
@ -49,6 +49,9 @@ configuration is tracked in `//ops/{modules,machines}`.
 * [`//nix/readTree`](https://cs.tvl.fyi/depot/-/blob/nix/readTree/README.md)
  contains the Nix code which automatically registers projects in our Nix
  attribute hierarchy based on their in-tree location
+* [`//tools/nixery`](https://cs.tvl.fyi/depot/-/tree/tools/nixery)
+  contains the source code of [Nixery][], a container registry that
+  can build images ad-hoc from Nix packages
 * `//nix/yants` contains **Y**et **A**nother **N**ix **T**ype **S**ystem, which
  we use for a variety of things throughout the repository
 * `//nix/buildGo` implements a Nix library that can build Go software in the
@ -119,3 +122,4 @@ Hackint also provide a [web chat][tvl-webchat].
 [hackint-xmpp]: https://hackint.org/transport/xmpp
 [tvl-xmpp]: xmpp:#tvl@irc.hackint.org?join
 [tvl-webchat]: https://webirc.hackint.org/#ircs://irc.hackint.org/#tvl
+[Nixery]: https://nixery.dev
--- a/ops/modules/nixery.nix
+++ b/ops/modules/nixery.nix
@ -28,7 +28,7 @@ in
        StateDirectory = "nixery";
        Restart = "always";
        ExecStartPre = "${pkgs.coreutils}/bin/mkdir -p ${storagePath}";
-        ExecStart = "${depot.third_party.nixery.nixery-bin}/bin/nixery";
+        ExecStart = "${depot.tools.nixery.nixery-bin}/bin/nixery";
      };

      environment = {
--- a/third_party/nixery/default.nix
+++ b/third_party/nixery/default.nix
@ -1,19 +0,0 @@
-# Import the Nixery repository as-is, but pass our own package set
-# instead of the pin it has.
-{ depot, pkgs, ... }:
-
-let
-  inherit (depot.nix.readTree) drvTargets;
-
-  commit = "601cd998077f77f257ad1a40fa488add8464650f";
-  src = pkgs.fetchFromGitHub {
-    owner = "google";
-    repo = "nixery";
-    rev = commit;
-    sha256 = "195rz25y3hfxcmniysajzjg7g69qhz7w06lql8fn0dbcdcxsq6g4";
-  };
-in
-drvTargets (import src {
-  inherit pkgs;
-  commitHash = _: commit;
-})
--- a/tools/depotfmt.nix
+++ b/tools/depotfmt.nix
@ -24,8 +24,7 @@ let
    includes = [ "*.nix" ]
    excludes = [
      "third_party/nix/tests/*",
-      "third_party/nix/src/tests/*",
-      "tools/nixery/*"
+      "third_party/nix/src/tests/*"
    ]

    [formatter.rust]
--- a/tools/nixery/.gitattributes
+++ b/tools/nixery/.gitattributes
@ -1,2 +0,0 @@
-# Ignore stylesheet modifications for the book in Linguist stats
-*.css linguist-detectable=false
--- a/tools/nixery/.github/workflows/build-and-test.yaml
+++ b/tools/nixery/.github/workflows/build-and-test.yaml
@ -1,27 +0,0 @@
-# Build Nixery, spin up an instance and pull an image from it.
-name: "Build and test Nixery"
-on:
-  push:
-    branches:
-      - master
-  pull_request: {}
-env:
-  NIX_PATH: "nixpkgs=https://github.com/NixOS/nixpkgs/archive/4263ba5e133cc3fc699c1152ab5ee46ef668e675.tar.gz"
-jobs:
-  build-and-test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Install Nix
-        uses: cachix/install-nix-action@v13
-      - name: Checkout
-        uses: actions/checkout@v2.3.4
-      - name: Prepare environment
-        run: nix-env -f '<nixpkgs>' -iA go
-      - name: Check formatting
-        run: "test -z $(gofmt -l .)"
-      - name: Run `go vet`
-        run: "go vet ./..."
-      - name: Build Nixery
-        run: "nix-build --no-out-link"
-      - name: Run integration test
-        run: scripts/integration-test.sh
--- a/tools/nixery/CONTRIBUTING.md
+++ b/tools/nixery/CONTRIBUTING.md
@ -1,35 +0,0 @@
-# How to Contribute
-
-We'd love to accept your patches and contributions to this project. There are
-just a few small guidelines you need to follow.
-
-## Contributor License Agreement
-
-Contributions to this project must be accompanied by a Contributor License
-Agreement. You (or your employer) retain the copyright to your contribution;
-this simply gives us permission to use and redistribute your contributions as
-part of the project. Head over to <https://cla.developers.google.com/> to see
-your current agreements on file or to sign a new one.
-
-You generally only need to submit a CLA once, so if you've already submitted one
-(even if it was for a different project), you probably don't need to do it
-again.
-
-## Commit messages
-
-Commits in this repository follow the [Angular commit message
-guidelines][commits].
-
-## Code reviews
-
-All submissions, including submissions by project members, require review. We
-use GitHub pull requests for this purpose. Consult
-[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
-information on using pull requests.
-
-## Community Guidelines
-
-This project follows [Google's Open Source Community
-Guidelines](https://opensource.google.com/conduct/).
-
-[commits]: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
--- a/tools/nixery/README.md
+++ b/tools/nixery/README.md
@ -4,7 +4,7 @@

 -----------------

-[![Build Status](https://github.com/tazjin/nixery/actions/workflows/build-and-test.yaml/badge.svg)](https://github.com/tazjin/nixery/actions/workflows/build-and-test.yaml)
+[![Build status](https://badge.buildkite.com/016bff4b8ae2704a3bbbb0a250784e6692007c582983b6dea7.svg?branch=refs/heads/canon)](https://buildkite.com/tvl/depot)

 **Nixery** is a Docker-compatible container registry that is capable of
 transparently building and serving container images using [Nix][].
@ -24,6 +24,15 @@ You can watch the NixCon 2019 [talk about
 Nixery](https://www.youtube.com/watch?v=pOI9H4oeXqA) for more information about
 the project and its use-cases.

+The canonical location of the Nixery source code is
+[`//tools/nixery`][depot-link] in the [TVL](https://tvl.fyi)
+monorepository. If cloning the entire repository is not desirable, the
+Nixery subtree can be cloned like this:
+
+    git clone https://code.tvl.fyi/depot.git:/tools/nixery.git
+
+The subtree is infrequently mirrored to `tazjin/nixery` on Github.
+
 ## Demo

 Click the image to see an example in which an image containing an interactive
@ -139,8 +148,9 @@ separate Nix function, which will make it possible to build images directly in
 Nix builds.

 [Nix]: https://nixos.org/
-[layering strategy]: https://storage.googleapis.com/nixdoc/nixery-layers.html
+[layering strategy]: https://tazj.in/blog/nixery-layers
 [gist]: https://gist.github.com/tazjin/08f3d37073b3590aacac424303e6f745
 [buildLayeredImage]: https://grahamc.com/blog/nix-and-layered-docker-images
 [public]: https://nixery.dev
+[depot-link]: https://cs.tvl.fyi/depot/-/tree/tools/nixery
 [gcs]: https://cloud.google.com/storage/
--- a/tools/nixery/builder/archive.go
+++ b/tools/nixery/builder/archive.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0
 package builder

 // This file implements logic for walking through a directory and creating a
--- a/tools/nixery/builder/builder.go
+++ b/tools/nixery/builder/builder.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Package builder implements the logic for assembling container
 // images. It shells out to Nix to retrieve all required Nix-packages
--- a/tools/nixery/builder/builder_test.go
+++ b/tools/nixery/builder/builder_test.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0
 package builder

 import (
--- a/tools/nixery/builder/cache.go
+++ b/tools/nixery/builder/cache.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0
 package builder

 import (
--- a/tools/nixery/builder/layers.go
+++ b/tools/nixery/builder/layers.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // This package reads an export reference graph (i.e. a graph representing the
 // runtime dependencies of a set of derivations) created by Nix and groups it in
--- a/tools/nixery/config/config.go
+++ b/tools/nixery/config/config.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Package config implements structures to store Nixery's configuration at
 // runtime as well as the logic for instantiating this configuration from the
--- a/tools/nixery/config/pkgsource.go
+++ b/tools/nixery/config/pkgsource.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0
 package config

 import (
--- a/tools/nixery/default.nix
+++ b/tools/nixery/default.nix
@ -1,16 +1,5 @@
-# Copyright 2019-2021 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 # This function header aims to provide compatibility between builds of
 # Nixery taking place inside/outside of the TVL depot.
@ -24,7 +13,8 @@
 , extraPackages ? [ ]
 , maxLayers ? 20
 , commitHash ? null
-, ... }@args:
+, ...
+}@args:

 with pkgs;

@ -54,7 +44,8 @@ let
      "-ldflags=-s -w -X main.version=${nixery-commit-hash}"
    ];
  };
-in depot.nix.readTree.drvTargets rec {
+in
+depot.nix.readTree.drvTargets rec {
  # Implementation of the Nix image building logic
  nixery-prepare-image = import ./prepare-image { inherit pkgs; };

@ -79,7 +70,8 @@ in depot.nix.readTree.drvTargets rec {
  # Container image containing Nixery and Nix itself. This image can
  # be run on Kubernetes, published on AppEngine or whatever else is
  # desired.
-  nixery-image = let
+  nixery-image =
+    let
      # Wrapper script for the wrapper script (meta!) which configures
      # the container environment appropriately.
      #
@ -110,7 +102,8 @@ in depot.nix.readTree.drvTargets rec {

        exec ${nixery-bin}/bin/nixery
      '';
-  in dockerTools.buildLayeredImage {
+    in
+    dockerTools.buildLayeredImage {
      name = "nixery";
      config.Cmd = [ "${nixery-launch-script}/bin/nixery" ];

--- a/tools/nixery/docs/default.nix
+++ b/tools/nixery/docs/default.nix
@ -1,16 +1,5 @@
-# Copyright 2019 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 # Builds the documentation page using the Rust project's 'mdBook'
 # tool.
@ -27,7 +16,8 @@ let
    rev = "9f0baf5e270128d9101ba4446cf6844889e399a2";
    sha256 = "1pf9i90gn98vz67h296w5lnwhssk62dc6pij983dff42dbci7lhj";
  };
-in runCommand "nixery-book" { } ''
+in
+runCommand "nixery-book" { } ''
  mkdir -p $out
  cp -r ${./.}/* .
  chmod -R a+w src
--- a/tools/nixery/docs/src/nixery.md
+++ b/tools/nixery/docs/src/nixery.md
@ -68,10 +68,6 @@ production project we recommend setting up a private instance. The public Nixery
 at `nixery.dev` is run on a best-effort basis and we make no guarantees about
 availability.

-### Is this an official Google project?
-
-**No.** Nixery is not officially supported by Google.
-
 ### Who made this?

 Nixery was written by [tazjin][], but many people have contributed to Nix over
@ -81,4 +77,4 @@ time, maybe you could become one of them?
 [Nix]: https://nixos.org/nix
 [layering strategy]: https://storage.googleapis.com/nixdoc/nixery-layers.html
 [layers]: https://grahamc.com/blog/nix-and-layered-docker-images
-[tazjin]: https://github.com/tazjin
+[tazjin]: https://tazj.in
--- a/tools/nixery/docs/src/run-your-own.md
+++ b/tools/nixery/docs/src/run-your-own.md
@ -65,13 +65,17 @@ use it with your own packages. There are three options available:

 ### 2.1. With a container image

-The easiest way to run Nixery is to build a container image.
-This section assumes that the container runtime used is Docker,
-please modify instructions accordingly if
-you are using something else.
+The easiest way to run Nixery is to build a container image. This
+section assumes that the container runtime used is Docker, please
+modify instructions accordingly if you are using something else.

-With a working Nix installation, building Nixery is done by invoking `nix-build
-A nixery-image` from a checkout of the [Nixery repository][repo].
+With a working Nix installation, you can clone and build the Nixery
+image like this:
+
+```
+git clone https://code.tvl.fyi/depot.git:/tools/nixery.git
+nix-build -A nixery-image
+```

 This will create a `result`-symlink which points to a tarball containing the
 image. In Docker, this tarball can be loaded by using `docker load -i result`.
@ -184,7 +188,6 @@ If the directory doesn't exist, Nixery will run fine but serve 404.
 [nixery#4]: https://github.com/tazjin/nixery/issues/4
 [Nix]: https://nixos.org/nix
 [gcs]: https://cloud.google.com/storage/
-[repo]: https://github.com/tazjin/nixery
 [signed-urls]: under-the-hood.html#5-image-layers-are-requested
 [ADC]: https://cloud.google.com/docs/authentication/production#finding_credentials_automatically
 [nixinstall]: https://nixos.org/manual/nix/stable/installation/installing-binary.html
--- a/tools/nixery/logs/logs.go
+++ b/tools/nixery/logs/logs.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0
 package logs

 // This file configures different log formatters via logrus. The
--- a/tools/nixery/main.go
+++ b/tools/nixery/main.go
@ -1,16 +1,5 @@
-// Copyright 2019-2020 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // The nixery server implements a container registry that transparently builds
 // container images based on Nix derivations.
--- a/tools/nixery/manifest/manifest.go
+++ b/tools/nixery/manifest/manifest.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Package image implements logic for creating the image metadata
 // (such as the image manifest and configuration).
--- a/tools/nixery/popcount/default.nix
+++ b/tools/nixery/popcount/default.nix
@ -1,16 +1,5 @@
-# Copyright 2019 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 { buildGoPackage }:

--- a/tools/nixery/popcount/popcount.go
+++ b/tools/nixery/popcount/popcount.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Popcount fetches popularity information for each store path in a
 // given Nix channel from the upstream binary cache.
--- a/tools/nixery/prepare-image/default.nix
+++ b/tools/nixery/prepare-image/default.nix
@ -1,16 +1,5 @@
-# Copyright 2019 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 # This file builds a wrapper script called by Nixery to ask for the
 # content information for a given image.
--- a/tools/nixery/prepare-image/load-pkgs.nix
+++ b/tools/nixery/prepare-image/load-pkgs.nix
@ -1,16 +1,5 @@
-# Copyright 2019 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 # Load a Nix package set from one of the supported source types
 # (nixpkgs, git, path).
@ -24,7 +13,8 @@ let
    let
      url =
        "https://github.com/NixOS/nixpkgs/archive/${channel}.tar.gz";
-    in import (fetchTarball url) importArgs;
+    in
+    import (fetchTarball url) importArgs;

  # If a git repository is requested, it is retrieved via
  # builtins.fetchGit which defaults to the git configuration of the
@ -35,7 +25,8 @@ let
  # No special handling is used for paths, so users are expected to pass one
  # that will work natively with Nix.
  importPath = path: import (toPath path) importArgs;
-in if srcType == "nixpkgs" then
+in
+if srcType == "nixpkgs" then
  fetchImportChannel srcArgs
 else if srcType == "git" then
  fetchImportGit (fromJSON srcArgs)
--- a/tools/nixery/prepare-image/prepare-image.nix
+++ b/tools/nixery/prepare-image/prepare-image.nix
@ -1,16 +1,5 @@
-# Copyright 2019 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 # This file contains a derivation that outputs structured information
 # about the runtime dependencies of an image with a given set of
@ -23,13 +12,13 @@

 {
  # Description of the package set to be used (will be loaded by load-pkgs.nix)
-  srcType ? "nixpkgs",
-  srcArgs ? "nixos-20.09",
-  system ? "x86_64-linux",
-  importArgs ? { },
-  # Path to load-pkgs.nix
-  loadPkgs ? ./load-pkgs.nix,
-  # Packages to install by name (which must refer to top-level attributes of
+  srcType ? "nixpkgs"
+, srcArgs ? "nixos-20.09"
+, system ? "x86_64-linux"
+, importArgs ? { }
+, # Path to load-pkgs.nix
+  loadPkgs ? ./load-pkgs.nix
+, # Packages to install by name (which must refer to top-level attributes of
  # nixpkgs). This is passed in as a JSON-array in string form.
  packages ? "[]"
 }:
@ -77,7 +66,8 @@ let
  # `deepFetch haskellpackages.stylish-haskell` retrieves
  # `haskellPackages.stylish-haskell`.
  deepFetch = with lib; s: n:
-    let path = splitString "." n;
+    let
+      path = splitString "." n;
      err = { error = "not_found"; pkg = n; };
      # The most efficient way I've found to do a lookup against
      # case-differing versions of an attribute is to first construct a
@ -88,13 +78,16 @@ let
      # (case-sensitive) one does not yield a result.
      hasUpper = str: (match ".*[A-Z].*" str) != null;
      allUpperKeys = filter hasUpper (attrNames s);
-        lowercased = listToAttrs (map (k: {
+      lowercased = listToAttrs (map
+        (k: {
          name = toLower k;
          value = k;
-          }) allUpperKeys);
+        })
+        allUpperKeys);
      caseAmendedPath = map (v: if hasAttr v lowercased then lowercased."${v}" else v) path;
      fetchLower = attrByPath caseAmendedPath err s;
-    in attrByPath path fetchLower s;
+    in
+    attrByPath path fetchLower s;

  # allContents contains all packages successfully retrieved by name
  # from the package set, as well as any errors encountered while
@ -105,19 +98,22 @@ let
    # Folds over the results of 'deepFetch' on all requested packages to
    # separate them into errors and content. This allows the program to
    # terminate early and return only the errors if any are encountered.
-    let splitter = attrs: res:
+    let
+      splitter = attrs: res:
        if hasAttr "error" res
        then attrs // { errors = attrs.errors ++ [ res ]; }
        else attrs // { contents = attrs.contents ++ [ res ]; };
      init = { contents = [ ]; errors = [ ]; };
      fetched = (map (deepFetch pkgs) (fromJSON packages));
-    in foldl' splitter init fetched;
+    in
+    foldl' splitter init fetched;

  # Contains the export references graph of all retrieved packages,
  # which has information about all runtime dependencies of the image.
  #
  # This is used by Nixery to group closures into image layers.
-  runtimeGraph = runCommand "runtime-graph.json" {
+  runtimeGraph = runCommand "runtime-graph.json"
+    {
      __structuredAttrs = true;
      exportReferencesGraph.graph = allContents.contents;
      PATH = "${coreutils}/bin";
@ -159,7 +155,8 @@ let
  # Metadata about the symlink layer which is required for serving it.
  # Two different hashes are computed for different usages (inclusion
  # in manifest vs. content-checking in the layer cache).
-  symlinkLayerMeta = fromJSON (readFile (runCommand "symlink-layer-meta.json" {
+  symlinkLayerMeta = fromJSON (readFile (runCommand "symlink-layer-meta.json"
+    {
      buildInputs = [ coreutils jq openssl ];
    } ''
    tarHash=$(sha256sum ${symlinkLayer} | cut -d ' ' -f1)
@ -181,7 +178,8 @@ let
    error = "not_found";
    pkgs = map (err: err.pkg) allContents.errors;
  };
-in writeText "build-output.json" (if (length allContents.errors) == 0
+in
+writeText "build-output.json" (if (length allContents.errors) == 0
 then toJSON buildOutput
 else toJSON errorOutput
 )
--- a/tools/nixery/shell.nix
+++ b/tools/nixery/shell.nix
@ -1,16 +1,5 @@
-# Copyright 2019 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
+# Copyright 2022 The TVL Contributors
+# SPDX-License-Identifier: Apache-2.0

 # Configures a shell environment that builds required local packages to
 # run Nixery.
--- a/tools/nixery/storage/filesystem.go
+++ b/tools/nixery/storage/filesystem.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Filesystem storage backend for Nixery.
 package storage
--- a/tools/nixery/storage/gcs.go
+++ b/tools/nixery/storage/gcs.go
@ -1,16 +1,5 @@
-// Copyright 2019 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Google Cloud Storage backend for Nixery.
 package storage
--- a/tools/nixery/storage/storage.go
+++ b/tools/nixery/storage/storage.go
@ -1,16 +1,5 @@
-// Copyright 2019-2020 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not
-// use this file except in compliance with the License. You may obtain a copy of
-// the License at
-//
-//     https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-// License for the specific language governing permissions and limitations under
-// the License.
+// Copyright 2022 The TVL Contributors
+// SPDX-License-Identifier: Apache-2.0

 // Package storage implements an interface that can be implemented by
 // storage backends, such as Google Cloud Storage or the local
--- a/users/tazjin/blog/posts/nixery-layers.md
+++ b/users/tazjin/blog/posts/nixery-layers.md
@ -260,13 +260,13 @@ TIP: This is implemented in [popcount][] in Nixery.
 Hopefully this detailed design review was useful to you. You can also watch [my
 NixCon talk][talk] about Nixery for a review of some of this, and some demos.

-[Nixery]: https://github.com/google/nixery
+[Nixery]: https://cs.tvl.fyi/depot/-/tree/tools/nixery
 [grhmc]: https://grahamc.com/blog/nix-and-layered-docker-images
 [Nix]: https://nixos.org/nix
 [registry protocols]: https://github.com/opencontainers/distribution-spec/blob/master/spec.md
 [nixery.dev]: https://nixery.dev
 [dominator trees]: https://en.wikipedia.org/wiki/Dominator_(graph_theory)
 [gonum/graph]: https://godoc.org/gonum.org/v1/gonum/graph
-[layers.go]: https://github.com/google/nixery/blob/master/builder/layers.go
-[popcount]: https://github.com/google/nixery/tree/master/popcount
+[layers.go]: https://cs.tvl.fyi/depot/-/blob/tools/nixery/builder/layers.go
+[popcount]: https://cs.tvl.fyi/depot/-/tree/tools/nixery/popcount
 [talk]: https://www.youtube.com/watch?v=pOI9H4oeXqA