tree 769f5cb52ae23c0654d36112575b5fe504f62e55
parent e74f1bd585edab6d9359eeb7516b7e97d12e59f8
author Heschi Kreinick <heschi@google.com> 1540322008 -0400
committer Heschi Kreinick <heschi@google.com> 1540579114 +0000

go/packages/packagestest: use a module proxy

Instead of writing replace directives to link the test's modules
together, fill a GOPROXY dir and use `go mod download` to fill a real
GOCACHE with them. This makes the tests more realistic, since replace
directives will be somewhat unusual. It also gives the name= query
something to search.

Actually doing this in a way that's compatible with packagestest's
abstraction is a little tricky, since it wants to know where the files
will be. The actual files will be created by go mod download, so we have
to get Export to put them there to begin with, then move them out of the
way.

Since the GOPROXY zip format doesn't support symlinks, those will only
work in the primary module.

Change-Id: I6bc1d368f1c950d789e409213107d60bb1389802
Reviewed-on: https://go-review.googlesource.com/c/144498
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>