Re: Go 1.21 breaks 'go get' and 'go mod tidy' downloads

[adrian-bl <adrian-bl@users.noreply.github.com>]

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New comment by adrian-bl on void-packages repository

https://github.com/void-linux/void-packages/issues/45775#issuecomment-1694403195

Comment:
> Which project are you talking about?

Any (Go) project: This is an issue with the Go installation itself, not an individual Go project.

Another way to reproduce is to attempt a simple `go install`, eg:

```
$ env | grep GO
$ which go
/usr/bin/go
$ go version
go version go1.21.0 linux/amd64
$ go install golang.org/x/tools/gopls@latest
go: golang.org/x/tools/gopls@latest: GOPROXY list is not the empty string, but contains no entries
```

Note that the same works out-of-the-box if i use a go-binary from https://go.dev/dl/:

```
$ wget https://go.dev/dl/go1.21.0.linux-amd64.tar.gz
$ tar -xvf go1.21.0.linux-amd64.tar.gz
$ cd go
$ ./bin/go version
go version go1.21.0 linux/amd64
$ ./bin/go  install golang.org/x/tools/gopls@latest
# works
```

Difference in go-env between the 2 installations:

```
$ /usr/bin/go env > 1
$ ./bin/go env > 2
$ diff -u 1 2
--- 1   2023-08-26 18:24:43.101796155 +0200
+++ 2   2023-08-26 18:24:45.258804051 +0200
@@ -15,12 +15,12 @@
 GOOS='linux'
 GOPATH='/home/wurstli/go'
 GOPRIVATE=''
-GOPROXY=''
-GOROOT='/usr/lib/go'
-GOSUMDB=''
+GOPROXY='https://proxy.golang.org,direct'
+GOROOT='/tmp/go/go'
+GOSUMDB='sum.golang.org'
 GOTMPDIR=''
-GOTOOLCHAIN=''
-GOTOOLDIR='/usr/lib/go/pkg/tool/linux_amd64'
+GOTOOLCHAIN='auto'
+GOTOOLDIR='/tmp/go/go/pkg/tool/linux_amd64'
 GOVCS=''
 GOVERSION='go1.21.0'
 GCCGO='gccgo'
@@ -37,4 +37,4 @@
 CGO_FFLAGS='-O2 -g'
 CGO_LDFLAGS='-O2 -g'
 PKG_CONFIG='pkg-config'
-GOGCCFLAGS='-fPIC -m64 -pthread -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3057310618=/tmp/go-build -gno-record-gcc-switches'
+GOGCCFLAGS='-fPIC -m64 -pthread -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1981408560=/tmp/go-build -gno-record-gcc-switches'
```


>  GOPROXY list is not the empty string which is obviously not empty string, which conflicts with what you said.

Can you elaborate? This is the error as-is printed out from the go toolchain: Where/how does it conflict with what i said?
(For reference, the error seems to come from https://github.com/golang/go/blob/master/src/cmd/go/internal/modfetch/proxy.go#L123)