chore(buf): Use nixpkgs-provided buf

The version of buf used is quite old.

nixpkgs provides a more recent version, but it requires us to migrate
config to the latest version.

depot_scanner.proto doesn't honor some of the conventions, so we need
allow_comment_ignores and drop a bunch of comments in there.

Change-Id: Ic978fe92fb7c8471f58c137497528f18aad8f3ab
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7053
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: tazjin <tazjin@tvl.su>

buf.gen.yaml

@@ -0,0 +1 @@
+version: v1

buf.yaml

@@ -1,13 +1,12 @@
-build:
+version: v1
-  roots:
+
-    #- proto
-    - third_party
 lint:
-  ignore:
+  allow_comment_ignores: true
-    - nix/buildGo
   use:
     - BASIC
     - FILE_LOWER_SNAKE_CASE
   except:
     - ENUM_VALUE_UPPER_SNAKE_CASE
     - PACKAGE_DIRECTORY_MATCH
+  ignore:
+    - nix/buildGo

nix/bufCheck/default.nix

@@ -3,7 +3,7 @@
 { depot, pkgs, ... }:
 
 pkgs.writeShellScriptBin "ci-buf-check" ''
-  ${depot.third_party.bufbuild}/bin/buf check lint --input .
+  ${depot.third_party.nixpkgs.buf}/bin/buf lint .
   # Report-only
-  ${depot.third_party.bufbuild}/bin/buf check breaking --input "." --against-input "./.git#branch=canon" || true
+  ${depot.third_party.nixpkgs.buf}/bin/buf breaking . --against "./.git#ref=HEAD~1" || true
 ''

third_party/bufbuild/default.nix

@@ -1,29 +0,0 @@
-# buf.build is a Protobuf linter and breaking change detector.
-# Several binaries are produced.
-{ pkgs, lib, ... }:
-
-pkgs.buildGoModule {
-  pname = "buf";
-  version = "v0.20.1";
-  vendorHash = "sha256:1gg5c7aiqb4w1zxwsraxxpln33xkmkzlp1h69xgi9i08zvrfipqs";
-
-  src = pkgs.fetchFromGitHub {
-    owner = "bufbuild";
-    repo = "buf";
-    rev = "5e8bf4c800de911764ffdf8d2188b7f6f54476e4";
-    sha256 = "1rni5swfnb4sbrd9rls4mc3902xhqrlsja96lfcdfjzx08g6kg20";
-  };
-
-  doCheck = false;
-
-  # TODO(riking): postinstall produce shell completions for bash, fish, zsh
-  # bin/buf bash-completion
-  # bin/buf zsh-completion
-  # # bin/buf manpages # not yet functional
-
-  meta = with lib; {
-    description = "Protobuf linter and breaking change detector";
-    homepage = "https://buf.build/docs/introduction";
-    license = licenses.asl20;
-  };
-}

tools/depot-scanner/depot_scanner.proto

@@ -18,19 +18,25 @@ message ScanRequest {
   string attr = 2;
   // Optionally, the attr to evaluate can be provided as a path to a folder or a
   // .nix file.  This is used by the HTTP service.
+  // buf:lint:ignore FIELD_LOWER_SNAKE_CASE
   string attrAsPath = 3;
 }
 
 message ScanResponse {
+  // buf:lint:ignore FIELD_LOWER_SNAKE_CASE
   repeated string depotPath = 1;
+  // buf:lint:ignore FIELD_LOWER_SNAKE_CASE
   repeated string nixStorePath = 2;
+  // buf:lint:ignore FIELD_LOWER_SNAKE_CASE
   repeated string corePkgsPath = 4;
+  // buf:lint:ignore FIELD_LOWER_SNAKE_CASE
   repeated string otherPath = 3;
 
   bytes derivation = 5;
 }
 
 message ArchiveRequest {
+  // buf:lint:ignore FIELD_LOWER_SNAKE_CASE
   repeated string depotPath = 1;
 }