tree cea3844993d438015abdd92e20cb735c64266414
parent 8fa933c4bb2c1c228d2c7ef2d80e0985d1f38aad
author Brad Fitzpatrick <bradfitz@golang.org> 1551938093 +0000
committer Brad Fitzpatrick <bradfitz@golang.org> 1551995543 +0000

cmd/buildlet: add localhost proxy to farmer.golang.org's module proxy

Now that farmer.golang.org is an authenticated GOPROXY server (CL 165779),
this adds the unauthenticated localhost server on the buildlet that
adds the auth headers to farmer.golang.org.

The buildlet only does this if the build includes env
GO_BUILDER_SET_GOPROXY=coordinator, in which case it listens on an
emphemeral localhost port per exec and sets GOPROXY to an HTTP server
running on that port. This way we don't need to deal with any port
management or conflicts.

Updates golang/go#14594

Change-Id: Iae6d2deda9d5e88ab659d94aaccc43e01fcf4a7c
Reviewed-on: https://go-review.googlesource.com/c/build/+/165782
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>