opentelemetry-collector-releases: add updateScript

Before this there was no auto-updates for
opentelemetry-collector-releases, but since
opentelemetry-collector-builder received auto-updates the versioning
regularly broke. This adds an updateScript that updates both at the
same time.

pkgs/tools/misc/opentelemetry-collector/builder.nix

@@ -6,7 +6,7 @@
 buildGoModule rec {
   pname = "ocb";
   # Also update `pkgs/tools/misc/opentelemetry-collector/releases.nix`
-  # whenever that version changes.
+  # whenever this version changes.
   version = "0.155.0";
 
   src = fetchFromGitHub {
@@ -31,6 +31,8 @@ buildGoModule rec {
     "-skip TestGenerateAndCompile|TestReplaceStatementsAreComplete|TestVersioning|TestRunInit"
   ];
 
+  passthru.updateScript = ./update.sh;
+
   # Rename to ocb (it's generated as "builder")
   postInstall = ''
     mv $out/bin/builder $out/bin/ocb

pkgs/tools/misc/opentelemetry-collector/releases.nix

@@ -4,9 +4,7 @@
   fetchFromGitHub,
   installShellFiles,
   testers,
-  nixosTests,
   opentelemetry-collector-builder,
-  pkgs,
   go,
   git,
   cacert,
@@ -17,12 +15,10 @@ let
   builder = "${opentelemetry-collector-builder}/bin/ocb";
 
   # Keep the version in sync with the builder.
-  rev = opentelemetry-collector-builder.src.rev;
-
-  version = lib.removePrefix "cmd/builder/v" rev;
+  version = "0.151.0";
 
   # This is a weird meta-repo where all the open-telemetry collectors are.
-  src = fetchFromGitHub {
+  releasesSrc = fetchFromGitHub {
     owner = "open-telemetry";
     repo = "opentelemetry-collector-releases";
     rev = "v${version}";
@@ -39,7 +35,10 @@ let
       hash,
     }:
     stdenv.mkDerivation {
-      inherit name;
+      # Inherit the version from the builder, so that updates there trigger
+      # a rebuild here.
+      inherit version;
+      pname = "${name}-src";
 
       nativeBuildInputs = [
         cacert
@@ -47,7 +46,7 @@ let
         go
       ];
 
-      inherit src;
+      src = releasesSrc;
 
       outputHash = hash;
       outputHashMode = "recursive";
@@ -117,11 +116,16 @@ let
             --zsh <($out/bin/${name} completion zsh)
         '';
 
-        passthru.tests = {
-          version = testers.testVersion {
-            inherit package version;
-            command = "${name} -v";
+        passthru = {
+          tests = {
+            version = testers.testVersion {
+              inherit package version;
+              command = "${name} -v";
+            };
           };
+          # The updatescript for the builder updates the releases
+          updateScript = null;
+          inherit releasesSrc;
         };
 
         meta = {

pkgs/tools/misc/opentelemetry-collector/update.sh

@@ -0,0 +1,19 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p curl jq nix-update common-updater-scripts
+set -euf
+
+# Get latest version from releases repo
+version=$(curl https://api.github.com/repos/open-telemetry/opentelemetry-collector-releases/releases/latest | jq -r '.name')
+version=${version#v}
+
+# Update builder
+nix-update opentelemetry-collector-builder --version="${version}"
+
+# Update the otel-collector-releases source
+update-source-version opentelemetry-collector-releases.otelcol "${version}" --source-key="releasesSrc"
+
+# Update the individual distributions
+for dist in {"",-contrib,-k8s,-otlp}
+do
+  nix-update "opentelemetry-collector-releases.otelcol${dist}" --version skip
+done