cmd/go: document GOCACHEPROG in go help environment

This adds GOCACHEPROG to the list of environment variables in "go help environment" and points to the cacheprog package documentation for details of the protocol. Fixes #71032 Updates #59719 Change-Id: Ib8f5804926a8fa59237661076d129c2852665ac3 Reviewed-on: https://go-review.googlesource.com/c/go/+/638997 Auto-Submit: Austin Clements <austin@google.com> Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com> Reviewed-by: Michael Matloob <matloob@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
golang · Jan 2, 2025 · 0afd7e8 · 0afd7e8
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diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
diff --git a/src/cmd/go/internal/help/helpdoc.go b/src/cmd/go/internal/help/helpdoc.go
@@ -506,6 +506,10 @@ General-purpose environment variables:
 	GOCACHE
 		The directory where the go command will store cached
 		information for reuse in future builds.
+	GOCACHEPROG
+		A command (with optional space-separated flags) that implements an
+		external go command build cache.
+		See 'go doc cmd/go/internal/cacheprog'.
 	GODEBUG
 		Enable various debugging facilities. See https://go.dev/doc/godebug
 		for details.