[chore] Clarify that cmd/otelcorecol and top-level go.mod are not the…

… source of the core distro (#10351) #### Description Documents the purpose of `cmd/otelcorecol` in a new README and in a comment on the builder manifest. Adds note to top-level go.mod. This is a common point of confusion and was recently confusing for users on the aftermath of CVE-2024-36129 Counterpart to open-telemetry/opentelemetry-collector-contrib/pull/33409 --------- Co-authored-by: Armin Ruech <[email protected]>
open-telemetry · Jun 6, 2024 · d3c5ce0 · d3c5ce0
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diff --git a/cmd/otelcorecol/README.md b/cmd/otelcorecol/README.md
@@ -0,0 +1,4 @@
+# `otelcorecol` test binary
+
+This folder contains the sources for the `otelcorecol` test binary. This binary is intended for internal **TEST PURPOSES ONLY**. The source files in this folder are **NOT** the ones used to build any official OpenTelemetry Collector releases.
+Check [open-telemetry/opentelemetry-collector-releases](https://github.com/open-telemetry/opentelemetry-collector-releases) for the official releases. Check the [**`otelcol` folder**](https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol) on that repository for the official Collector core manifest.
diff --git a/cmd/otelcorecol/builder-config.yaml b/cmd/otelcorecol/builder-config.yaml
@@ -1,3 +1,11 @@
+# NOTE:
+# This builder configuration is NOT used to build any official binary.
+# To see the builder manifests used for official binaries, 
+# check https://github.com/open-telemetry/opentelemetry-collector-releases
+# 
+# For the OpenTelemetry Collector Core official distribution sources, check
+# https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol
+
 dist:
   module: go.opentelemetry.io/collector/cmd/otelcorecol
   name: otelcorecol

diff --git a/go.mod b/go.mod
@@ -1,5 +1,13 @@
 module go.opentelemetry.io/collector
 
+// NOTE:
+// This go.mod is NOT used to build any official binary.
+// To see the builder manifests used for official binaries,
+// check https://github.com/open-telemetry/opentelemetry-collector-releases
+//
+// For the OpenTelemetry Collector Core distribution specifically, see
+// https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol
+
 go 1.21.0
 
 require (