settings: support predefined variables in go.toolsEnvVars

[edp1096]

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• #vscode channel in Gophers Slack

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Helpful pages include:

• GOPATH
• Module Support
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  • Set "trace": "log" and share the resulting logs in the debug console when logging an issue.

Please answer these questions before submitting your issue. Thanks!

What version of Go, VS Code & VS Code Go extension are you using?

• Run go version to get version of Go
  • go version go1.14.4 windows/amd64
• Run code -v or code-insiders -v to get version of VS Code or VS Code Insiders
  • 버전: 1.47.2
    커밋: 17299e413d5590b14ab0340ea477cdd86ff13daf
    날짜: 2020-07-15T18:22:06.216Z
    Electron: 7.3.2
    Chrome: 78.0.3904.130
    Node.js: 12.8.1
    V8: 7.8.279.23-electron.0
    OS: Windows_NT x64 10.0.18363
• Check your installed extensions to get the version of the VS Code Go extension
  • 이름: Go
    ID: golang.go
    설명: Rich Go language support for Visual Studio Code
    버전: 0.15.2
    게시자: Go Team at Google
    VS Marketplace 링크: https://marketplace.visualstudio.com/items?itemName=golang.Go
• Run go env to get the go development environment details

	- ws$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=D:\devs\pcbangstudio\user\gocache
set GOENV=D:\devs\pcbangstudio\user\userprofile\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=D:\devs\pcbangstudio\user\gopath
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=D:\devs\pcbangstudio\tools\langs\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=D:\devs\pcbangstudio\tools\langs\go\pkg\tool\windows_amd64
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=D:\devs\pcbangstudio\workspace\chsn-inventory\ws\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=D:\devs\pcbangstudio\user\tmp\go-build876394286=/tmp/go-build -gno-record-gcc-switches
ws$

Share the Go related settings you have added/edited

Run Preferences: Open Settings (JSON) command to open your settings.json file.
Share all the settings with the go. or ["go"] or gopls prefixes.

    "go.toolsEnvVars": {
        "GOARCH": "amd64",
        "GOOS": "windows",
        "GOBIN": "${workspaceFolder}/bin"
    },
    "go.useLanguageServer": true,
    "[go]": {
        "editor.snippetSuggestions": "none",
        "editor.formatOnSave": true,
        "editor.codeActionsOnSave": {
            "source.organizeImports": true,
            "source.fixAll": true,
        },
        "editor.defaultFormatter": "golang.go"
    },
    "files.eol": "\n",
    "gopls": {
        "usePlaceholders": true // add parameter placeholders when completing a function
    },
    "go.languageServerExperimentalFeatures": {
        "format": true,
        "autoComplete": true,
        "rename": true,
        "goToDefinition": true,
        "hover": true,
        "signatureHelp": true,
        "goToTypeDefinition": true,
        "goToImplementation": true,
        "documentSymbols": true, // =outline
        "workspaceSymbols": true,
        "findReferences": true
    },
    "go.languageServerFlags": [],
    "go.docsTool": "gogetdoc",
    "go.formatTool": "goimports",
    "go.gocodeAutoBuild": true,

Describe the bug

A clear and concise description of what the bug.
A clear and concise description of what you expected to happen.

When use install features with Predefined variable of vscode, vscode-go cannot recognize the path value.

• Go: Install Current Package - Output message when try to install my source to GOBIN where I specified.

Installing current package
Installation failed: cannot install, GOBIN must be an absolute path

• Go: Install/Update Tools - Output message when try to install go tools by vscode-go.

Tools environment: GOPATH=D:\devs\pcbangstudio\user\gopath, GOBIN=${workspaceFolder}/bin
Installing 1 tool at the configured GOBIN: ${workspaceFolder}/bin in module mode.
  gopls

Installing golang.org/x/tools/gopls FAILED

1 tools failed to install.

gopls: failed to install [object Object]: Error: Command failed: D:\devs\pcbangstudio\tools\langs\go\bin\go.exe get -v golang.org/x/tools/gopls
go: golang.org/x/tools/gopls upgrade => v0.4.3
cannot install, GOBIN must be an absolute path
 undefined  

[stamblerre]

I'm not sure if specifying ${workspaceFolder} in your settings will work the same way as in a launch.json. Can you remove that setting or use the go.toolsGopath setting to specify a location in which to install tools?

[edp1096]

Hello Rebecca,
Solved tools installation by adding "go.toolsGopath": "${env:GOPATH}", thank you but, Go: Install Current Package feature is still showing same message failed.
Is there not possible using go.toolsEnvVars with Predefined variables at settings.json anymore?

[stamblerre]

It's possible that we accidentally made a change that broke this. You're right - this does seem like it should work, and I am able to reproduce the error. Thanks for the report - we'll look into it.

[gopherbot]

Change https://golang.org/cl/246519 mentions this issue: src/goEnv.ts: readd go.toolsEnvVars variable substitution