From 07f8684e69e967cce8dc64dbe9c484f812ea0a8f Mon Sep 17 00:00:00 2001
From: dmgk <dmgk@FreeBSD.org>
Date: Mon, 2 Mar 2020 13:58:40 +0000
Subject: [PATCH] Mk/Uses/go.mk: Avoid pollution of Go module cache with
 modules downloaded by gomod-vendor

Use module cache local to the WRKDIR and add the -modcacherw flag (available in
go1.14 [1, 2]) to instruct go mod vendor to leave directories in the module
cache read-write instead of making them unwritable.

[1] https://github.com/golang/go/issues/31481
[2] https://go-review.googlesource.com/c/go/+/202079/

Reviewed by:	swills
Differential Revision:	https://reviews.freebsd.org/D23063
---
 Mk/Uses/go.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Mk/Uses/go.mk b/Mk/Uses/go.mk
index ed2a97e4765b9..59c03d880dd7e 100644
--- a/Mk/Uses/go.mk
+++ b/Mk/Uses/go.mk
@@ -179,7 +179,7 @@ _MODULES2TUPLE_CMD=	modules2tuple
 gomod-vendor: patch
 	@if type ${GO_CMD} > /dev/null 2>&1; then \
 		if type ${_MODULES2TUPLE_CMD} > /dev/null 2>&1; then \
-			cd ${WRKSRC}; ${GO_CMD} mod vendor; \
+			cd ${WRKSRC}; ${SETENV} GOPATH=${WRKDIR}/.gopath GOFLAGS=-modcacherw ${GO_CMD} mod vendor; \
 			[ -r vendor/modules.txt ] && ${_MODULES2TUPLE_CMD} vendor/modules.txt; \
 		else \
 			${ECHO_MSG} "===> Please install \"ports-mgmt/modules2tuple\""; \