cmd/go: set go.work path using GOWORK, and remove -workfile flag

This change removes the -workfile flag and allows the go.work file path
to be set using GOWORK (which was previously read-only). This removes
the potential discrepancy and confusion between the flag and environment
variable.

GOWORK will still return the actual path of the go.work file found if it
is set to '' or 'auto'. GOWORK will return 'off' if it is set to 'off'.

For #45713
Fixes #51171

Change-Id: I72eed65d47c63c81433f2b54158d514daeaa1ab3
Reviewed-on: https://go-review.googlesource.com/c/go/+/385995
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>

27 files changed, 80 insertions, 86 deletions

diff --git a/doc/go1.18.html b/doc/go1.18.html
index 243df2b7d4..c75bfe9e5d 100644
--- a/doc/go1.18.html
+++ b/doc/go1.18.html
@@ -345,8 +345,8 @@ Do not send CLs removing the interior tags from such phrases.
 <p><!-- https://golang.org/issue/45713 -->
   The <code>go</code> command now supports a "Workspace" mode. If a
   <code>go.work</code> file is found in the working directory or a
-  parent directory, or one is specified using the <code>-workfile</code>
-  flag, it will put the <code>go</code> command into workspace mode.
+  parent directory, or one is specified using the <code>GOWORK</code>
+  environment variable, it will put the <code>go</code> command into workspace mode.
   In workspace mode, the <code>go.work</code> file will be used to
   determine the set of main modules used as the roots for module
   resolution, instead of using the normally-found <code>go.mod</code>
diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
index 13a3f00d6f..63e7900e02 100644
--- a/src/cmd/go/alldocs.go
+++ b/src/cmd/go/alldocs.go
@@ -177,14 +177,6 @@
 // 		directory, but it is not accessed. When -modfile is specified, an
 // 		alternate go.sum file is also used: its path is derived from the
 // 		-modfile flag by trimming the ".mod" extension and appending ".sum".
-// 	-workfile file
-// 		in module aware mode, use the given go.work file as a workspace file.
-// 		By default or when -workfile is "auto", the go command searches for a
-// 		file named go.work in the current directory and then containing directories
-// 		until one is found. If a valid go.work file is found, the modules
-// 		specified will collectively be used as the main modules. If -workfile
-// 		is "off", or a go.work file is not found in "auto" mode, workspace
-// 		mode is disabled.
 // 	-overlay file
 // 		read a JSON config file that provides an overlay for build operations.
 // 		The file is a JSON struct with a single field, named 'Replace', that
@@ -2075,6 +2067,14 @@
 // 	GOVCS
 // 		Lists version control commands that may be used with matching servers.
 // 		See 'go help vcs'.
+// 	GOWORK
+// 		In module aware mode, use the given go.work file as a workspace file.
+// 		By default or when GOWORK is "auto", the go command searches for a
+// 		file named go.work in the current directory and then containing directories
+// 		until one is found. If a valid go.work file is found, the modules
+// 		specified will collectively be used as the main modules. If GOWORK
+// 		is "off", or a go.work file is not found in "auto" mode, workspace
+// 		mode is disabled.
 //
 // Environment variables for use with cgo:
 //
diff --git a/src/cmd/go/internal/base/flag.go b/src/cmd/go/internal/base/flag.go
index 2c72c7e562..120420a126 100644
--- a/src/cmd/go/internal/base/flag.go
+++ b/src/cmd/go/internal/base/flag.go
@@ -62,13 +62,6 @@ func AddModFlag(flags *flag.FlagSet) {
 	flags.Var(explicitStringFlag{value: &cfg.BuildMod, explicit: &cfg.BuildModExplicit}, "mod", "")
 }
 
-// AddWorkfileFlag adds the workfile flag to the flag set. It enables workspace
-// mode for commands that support it by resetting the cfg.WorkFile variable
-// to "" (equivalent to auto) rather than off.
-func AddWorkfileFlag(flags *flag.FlagSet) {
-	flags.Var(explicitStringFlag{value: &cfg.WorkFile, explicit: &cfg.WorkFileExplicit}, "workfile", "")
-}
-
 // AddModCommonFlags adds the module-related flags common to build commands
 // and 'go mod' subcommands.
 func AddModCommonFlags(flags *flag.FlagSet) {
diff --git a/src/cmd/go/internal/cfg/cfg.go b/src/cmd/go/internal/cfg/cfg.go
index 7f68d7bb62..deab3dddd0 100644
--- a/src/cmd/go/internal/cfg/cfg.go
+++ b/src/cmd/go/internal/cfg/cfg.go
@@ -49,10 +49,8 @@ var (
 	BuildWork              bool // -work flag
 	BuildX                 bool // -x flag
 
-	ModCacheRW       bool   // -modcacherw flag
-	ModFile          string // -modfile flag
-	WorkFile         string // -workfile flag
-	WorkFileExplicit bool   // whether -workfile was set explicitly
+	ModCacheRW bool   // -modcacherw flag
+	ModFile    string // -modfile flag
 
 	CmdName string // "build", "install", "list", "mod tidy", etc.
 
diff --git a/src/cmd/go/internal/envcmd/env.go b/src/cmd/go/internal/envcmd/env.go
index e56dd8223f..c1adf8cef4 100644
--- a/src/cmd/go/internal/envcmd/env.go
+++ b/src/cmd/go/internal/envcmd/env.go
@@ -154,6 +154,10 @@ func ExtraEnvVars() []cfg.EnvVar {
 	}
 	modload.InitWorkfile()
 	gowork := modload.WorkFilePath()
+	// As a special case, if a user set off explicitly, report that in GOWORK.
+	if cfg.Getenv("GOWORK") == "off" {
+		gowork = "off"
+	}
 	return []cfg.EnvVar{
 		{Name: "GOMOD", Value: gomod},
 		{Name: "GOWORK", Value: gowork},
diff --git a/src/cmd/go/internal/help/helpdoc.go b/src/cmd/go/internal/help/helpdoc.go
index d1eaad1c12..28ddaac8f1 100644
--- a/src/cmd/go/internal/help/helpdoc.go
+++ b/src/cmd/go/internal/help/helpdoc.go
@@ -545,6 +545,14 @@ General-purpose environment variables:
 	GOVCS
 		Lists version control commands that may be used with matching servers.
 		See 'go help vcs'.
+	GOWORK
+		In module aware mode, use the given go.work file as a workspace file.
+		By default or when GOWORK is "auto", the go command searches for a
+		file named go.work in the current directory and then containing directories
+		until one is found. If a valid go.work file is found, the modules
+		specified will collectively be used as the main modules. If GOWORK
+		is "off", or a go.work file is not found in "auto" mode, workspace
+		mode is disabled.
 
 Environment variables for use with cgo:
 
diff --git a/src/cmd/go/internal/list/list.go b/src/cmd/go/internal/list/list.go
index d9a7078ccf..8be9211935 100644
--- a/src/cmd/go/internal/list/list.go
+++ b/src/cmd/go/internal/list/list.go
@@ -316,7 +316,6 @@ For more about modules, see https://golang.org/ref/mod.
 func init() {
 	CmdList.Run = runList // break init cycle
 	work.AddBuildFlags(CmdList, work.DefaultBuildFlags)
-	base.AddWorkfileFlag(&CmdList.Flag)
 }
 
 var (
diff --git a/src/cmd/go/internal/modcmd/download.go b/src/cmd/go/internal/modcmd/download.go
index 6b8a010fd9..5bc6cbc4bb 100644
--- a/src/cmd/go/internal/modcmd/download.go
+++ b/src/cmd/go/internal/modcmd/download.go
@@ -70,7 +70,6 @@ func init() {
 	// TODO(jayconrod): https://golang.org/issue/35849 Apply -x to other 'go mod' commands.
 	cmdDownload.Flag.BoolVar(&cfg.BuildX, "x", false, "")
 	base.AddModCommonFlags(&cmdDownload.Flag)
-	base.AddWorkfileFlag(&cmdDownload.Flag)
 }
 
 type moduleJSON struct {
diff --git a/src/cmd/go/internal/modcmd/graph.go b/src/cmd/go/internal/modcmd/graph.go
index 9b6aa1fb14..9568c65740 100644
--- a/src/cmd/go/internal/modcmd/graph.go
+++ b/src/cmd/go/internal/modcmd/graph.go
@@ -42,7 +42,6 @@ var (
 func init() {
 	cmdGraph.Flag.Var(&graphGo, "go", "")
 	base.AddModCommonFlags(&cmdGraph.Flag)
-	base.AddWorkfileFlag(&cmdGraph.Flag)
 }
 
 func runGraph(ctx context.Context, cmd *base.Command, args []string) {
diff --git a/src/cmd/go/internal/modcmd/verify.go b/src/cmd/go/internal/modcmd/verify.go
index 3f0c005d5d..459bf5d070 100644
--- a/src/cmd/go/internal/modcmd/verify.go
+++ b/src/cmd/go/internal/modcmd/verify.go
@@ -39,7 +39,6 @@ See https://golang.org/ref/mod#go-mod-verify for more about 'go mod verify'.
 
 func init() {
 	base.AddModCommonFlags(&cmdVerify.Flag)
-	base.AddWorkfileFlag(&cmdVerify.Flag)
 }
 
 func runVerify(ctx context.Context, cmd *base.Command, args []string) {
diff --git a/src/cmd/go/internal/modcmd/why.go b/src/cmd/go/internal/modcmd/why.go
index d8355cca95..2d3f1eb05b 100644
--- a/src/cmd/go/internal/modcmd/why.go
+++ b/src/cmd/go/internal/modcmd/why.go
@@ -59,7 +59,6 @@ var (
 func init() {
 	cmdWhy.Run = runWhy // break init cycle
 	base.AddModCommonFlags(&cmdWhy.Flag)
-	base.AddWorkfileFlag(&cmdWhy.Flag)
 }
 
 func runWhy(ctx context.Context, cmd *base.Command, args []string) {
diff --git a/src/cmd/go/internal/modload/init.go b/src/cmd/go/internal/modload/init.go
index 523be8c473..a07066696e 100644
--- a/src/cmd/go/internal/modload/init.go
+++ b/src/cmd/go/internal/modload/init.go
@@ -288,16 +288,16 @@ func BinDir() string {
 // operate in workspace mode. It should not be called by other commands,
 // for example 'go mod tidy', that don't operate in workspace mode.
 func InitWorkfile() {
-	switch cfg.WorkFile {
+	switch gowork := cfg.Getenv("GOWORK"); gowork {
 	case "off":
 		workFilePath = ""
 	case "", "auto":
 		workFilePath = findWorkspaceFile(base.Cwd())
 	default:
-		if !filepath.IsAbs(cfg.WorkFile) {
-			base.Fatalf("the path provided to -workfile must be an absolute path")
+		if !filepath.IsAbs(gowork) {
+			base.Fatalf("the path provided to GOWORK must be an absolute path")
 		}
-		workFilePath = cfg.WorkFile
+		workFilePath = gowork
 	}
 }
 
@@ -1109,7 +1109,7 @@ func setDefaultBuildMod() {
 		if inWorkspaceMode() && cfg.BuildMod != "readonly" {
 			base.Fatalf("go: -mod may only be set to readonly when in workspace mode, but it is set to %q"+
 				"\n\tRemove the -mod flag to use the default readonly value,"+
-				"\n\tor set -workfile=off to disable workspace mode.", cfg.BuildMod)
+				"\n\tor set GOWORK=off to disable workspace mode.", cfg.BuildMod)
 		}
 		// Don't override an explicit '-mod=' argument.
 		return
diff --git a/src/cmd/go/internal/run/run.go b/src/cmd/go/internal/run/run.go
index c4b70b64fe..00a3e4b332 100644
--- a/src/cmd/go/internal/run/run.go
+++ b/src/cmd/go/internal/run/run.go
@@ -65,7 +65,6 @@ func init() {
 	CmdRun.Run = runRun // break init loop
 
 	work.AddBuildFlags(CmdRun, work.DefaultBuildFlags)
-	base.AddWorkfileFlag(&CmdRun.Flag)
 	CmdRun.Flag.Var((*base.StringsFlag)(&work.ExecCmd), "exec", "")
 }
 
diff --git a/src/cmd/go/internal/test/testflag.go b/src/cmd/go/internal/test/testflag.go
index b9d1ec91ff..c046caca25 100644
--- a/src/cmd/go/internal/test/testflag.go
+++ b/src/cmd/go/internal/test/testflag.go
@@ -28,7 +28,6 @@ import (
 
 func init() {
 	work.AddBuildFlags(CmdTest, work.OmitVFlag)
-	base.AddWorkfileFlag(&CmdTest.Flag)
 
 	cf := CmdTest.Flag
 	cf.BoolVar(&testC, "c", false, "")
diff --git a/src/cmd/go/internal/work/build.go b/src/cmd/go/internal/work/build.go
index 1c278d3d99..0b5848a77d 100644
--- a/src/cmd/go/internal/work/build.go
+++ b/src/cmd/go/internal/work/build.go
@@ -130,14 +130,6 @@ and test commands:
 		directory, but it is not accessed. When -modfile is specified, an
 		alternate go.sum file is also used: its path is derived from the
 		-modfile flag by trimming the ".mod" extension and appending ".sum".
-	-workfile file
-		in module aware mode, use the given go.work file as a workspace file.
-		By default or when -workfile is "auto", the go command searches for a
-		file named go.work in the current directory and then containing directories
-		until one is found. If a valid go.work file is found, the modules
-		specified will collectively be used as the main modules. If -workfile
-		is "off", or a go.work file is not found in "auto" mode, workspace
-		mode is disabled.
 	-overlay file
 		read a JSON config file that provides an overlay for build operations.
 		The file is a JSON struct with a single field, named 'Replace', that
@@ -217,7 +209,6 @@ func init() {
 
 	AddBuildFlags(CmdBuild, DefaultBuildFlags)
 	AddBuildFlags(CmdInstall, DefaultBuildFlags)
-	base.AddWorkfileFlag(&CmdBuild.Flag)
 }
 
 // Note that flags consulted by other parts of the code
diff --git a/src/cmd/go/internal/workcmd/edit.go b/src/cmd/go/internal/workcmd/edit.go
index e7b1b13271..05f4f3dddf 100644
--- a/src/cmd/go/internal/workcmd/edit.go
+++ b/src/cmd/go/internal/workcmd/edit.go
@@ -110,8 +110,6 @@ func init() {
 	cmdEdit.Flag.Var(flagFunc(flagEditworkDropUse), "dropuse", "")
 	cmdEdit.Flag.Var(flagFunc(flagEditworkReplace), "replace", "")
 	cmdEdit.Flag.Var(flagFunc(flagEditworkDropReplace), "dropreplace", "")
-
-	base.AddWorkfileFlag(&cmdEdit.Flag)
 }
 
 func runEditwork(ctx context.Context, cmd *base.Command, args []string) {
@@ -137,7 +135,7 @@ func runEditwork(ctx context.Context, cmd *base.Command, args []string) {
 	}
 
 	if gowork == "" {
-		base.Fatalf("go: no go.work file found\n\t(run 'go work init' first or specify path using -workfile flag)")
+		base.Fatalf("go: no go.work file found\n\t(run 'go work init' first or specify path using GOWORK environment variable)")
 	}
 
 	anyFlags :=
diff --git a/src/cmd/go/internal/workcmd/init.go b/src/cmd/go/internal/workcmd/init.go
index aa3126319a..63bee6e4f5 100644
--- a/src/cmd/go/internal/workcmd/init.go
+++ b/src/cmd/go/internal/workcmd/init.go
@@ -33,7 +33,6 @@ current go version will also be listed in the go.work file.
 
 func init() {
 	base.AddModCommonFlags(&cmdInit.Flag)
-	base.AddWorkfileFlag(&cmdInit.Flag)
 }
 
 func runInit(ctx context.Context, cmd *base.Command, args []string) {
@@ -41,11 +40,6 @@ func runInit(ctx context.Context, cmd *base.Command, args []string) {
 
 	modload.ForceUseModules = true
 
-	// TODO(matloob): support using the -workfile path
-	// To do that properly, we'll have to make the module directories
-	// make dirs relative to workFile path before adding the paths to
-	// the directory entries
-
 	workFile := modload.WorkFilePath()
 	if workFile == "" {
 		workFile = filepath.Join(base.Cwd(), "go.work")
diff --git a/src/cmd/go/internal/workcmd/sync.go b/src/cmd/go/internal/workcmd/sync.go
index 948fc5d370..b0f61c5fa2 100644
--- a/src/cmd/go/internal/workcmd/sync.go
+++ b/src/cmd/go/internal/workcmd/sync.go
@@ -39,14 +39,13 @@ that in each workspace module.
 
 func init() {
 	base.AddModCommonFlags(&cmdSync.Flag)
-	base.AddWorkfileFlag(&cmdSync.Flag)
 }
 
 func runSync(ctx context.Context, cmd *base.Command, args []string) {
 	modload.ForceUseModules = true
 	modload.InitWorkfile()
 	if modload.WorkFilePath() == "" {
-		base.Fatalf("go: no go.work file found\n\t(run 'go work init' first or specify path using -workfile flag)")
+		base.Fatalf("go: no go.work file found\n\t(run 'go work init' first or specify path using GOWORK environment variable)")
 	}
 
 	workGraph := modload.LoadModGraph(ctx, "")
diff --git a/src/cmd/go/internal/workcmd/use.go b/src/cmd/go/internal/workcmd/use.go
index 3d003b78eb..1ee2d4e3c4 100644
--- a/src/cmd/go/internal/workcmd/use.go
+++ b/src/cmd/go/internal/workcmd/use.go
@@ -42,7 +42,6 @@ func init() {
 	cmdUse.Run = runUse // break init cycle
 
 	base.AddModCommonFlags(&cmdUse.Flag)
-	base.AddWorkfileFlag(&cmdUse.Flag)
 }
 
 func runUse(ctx context.Context, cmd *base.Command, args []string) {
@@ -53,7 +52,7 @@ func runUse(ctx context.Context, cmd *base.Command, args []string) {
 	gowork = modload.WorkFilePath()
 
 	if gowork == "" {
-		base.Fatalf("go: no go.work file found\n\t(run 'go work init' first or specify path using -workfile flag)")
+		base.Fatalf("go: no go.work file found\n\t(run 'go work init' first or specify path using GOWORK environment variable)")
 	}
 	workFile, err := modload.ReadWorkFile(gowork)
 	if err != nil {
diff --git a/src/cmd/go/testdata/script/work.txt b/src/cmd/go/testdata/script/work.txt
index cbb3746a69..a10bf5a1c3 100644
--- a/src/cmd/go/testdata/script/work.txt
+++ b/src/cmd/go/testdata/script/work.txt
@@ -32,7 +32,9 @@ stdout 'example.com/b'
 go list -mod=readonly all
 ! go list -mod=mod all
 stderr '^go: -mod may only be set to readonly when in workspace mode'
-go list -mod=mod -workfile=off all
+env GOWORK=off
+go list -mod=mod all
+env GOWORK=
 
 # Test that duplicates in the use list return an error
 cp go.work go.work.backup
@@ -53,7 +55,9 @@ go run example.com/d
 # This exercises the code that determines which module command-line-arguments
 # belongs to.
 go list ./b/main.go
-go build -n -workfile=off -o foo foo.go
+env GOWORK=off
+go build -n -o foo foo.go
+env GOWORK=
 go build -n -o foo foo.go
 
 -- go.work.dup --
diff --git a/src/cmd/go/testdata/script/work_edit.txt b/src/cmd/go/testdata/script/work_edit.txt
index fd04bbda6e..71959ca0dd 100644
--- a/src/cmd/go/testdata/script/work_edit.txt
+++ b/src/cmd/go/testdata/script/work_edit.txt
@@ -30,7 +30,8 @@ cmp stdout go.work.want_print
 go work edit -json -go 1.19 -use b -dropuse c -replace 'x.1@v1.4.0 = ../z' -dropreplace x.1 -dropreplace x.1@v1.3.0
 cmp stdout go.work.want_json
 
-go work edit -print -fmt -workfile $GOPATH/src/unformatted
+env GOWORK=$GOPATH/src/unformatted
+go work edit -print -fmt
 cmp stdout formatted
 
 -- m/go.mod --
diff --git a/src/cmd/go/testdata/script/work_env.txt b/src/cmd/go/testdata/script/work_env.txt
index ec3d3be3ed..511bb4e2cb 100644
--- a/src/cmd/go/testdata/script/work_env.txt
+++ b/src/cmd/go/testdata/script/work_env.txt
@@ -13,6 +13,10 @@ cd src
 go env GOWORK
 stdout 'go.work'
 
+env GOWORK='off'
+go env GOWORK
+stdout 'off'
+
 ! go env -w GOWORK=off
 stderr '^go: GOWORK cannot be modified$'
 
diff --git a/src/cmd/go/testdata/script/work_gowork.txt b/src/cmd/go/testdata/script/work_gowork.txt
new file mode 100644
index 0000000000..1cfbf0ca18
--- /dev/null
+++ b/src/cmd/go/testdata/script/work_gowork.txt
@@ -0,0 +1,24 @@
+env GOWORK=stop.work
+! go list a # require absolute path
+! stderr panic
+env GOWORK=doesnotexist
+! go list a
+! stderr panic
+
+env GOWORK=$GOPATH/src/stop.work
+go list -n a
+go build -n a
+go test -n a
+
+-- stop.work --
+go 1.18
+
+use ./a
+-- a/a.go --
+package a
+-- a/a_test.go --
+package a
+-- a/go.mod --
+module a
+
+go 1.18
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/work_init_workfile.txt b/src/cmd/go/testdata/script/work_init_gowork.txt
index e6f56716f9..55ac99b8c0 100644
--- a/src/cmd/go/testdata/script/work_init_workfile.txt
+++ b/src/cmd/go/testdata/script/work_init_gowork.txt
@@ -1,11 +1,15 @@
-# Test that the workfile flag is used by go work init.
+# Test that the GOWORK environment variable flag is used by go work init.
 
+! exists go.work
 go work init
 exists go.work
 
-go work init -workfile=$GOPATH/src/foo/foo.work
+env GOWORK=$GOPATH/src/foo/foo.work
+! exists foo/foo.work
+go work init
 exists foo/foo.work
 
+env GOWORK=
 cd foo/bar
 ! go work init
 stderr 'already exists'
diff --git a/src/cmd/go/testdata/script/work_nowork.txt b/src/cmd/go/testdata/script/work_nowork.txt
index b0320cbccb..b4c9b1d9cf 100644
--- a/src/cmd/go/testdata/script/work_nowork.txt
+++ b/src/cmd/go/testdata/script/work_nowork.txt
@@ -1,17 +1,17 @@
 ! go work use
-stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using -workfile flag\)$'
+stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using GOWORK environment variable\)$'
 
 ! go work use .
-stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using -workfile flag\)$'
+stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using GOWORK environment variable\)$'
 
 ! go work edit
-stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using -workfile flag\)$'
+stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using GOWORK environment variable\)$'
 
 ! go work edit -go=1.18
-stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using -workfile flag\)$'
+stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using GOWORK environment variable\)$'
 
 ! go work sync
-stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using -workfile flag\)$'
+stderr '^go: no go\.work file found\n\t\(run ''go work init'' first or specify path using GOWORK environment variable\)$'
 
 -- go.mod --
 module example
diff --git a/src/cmd/go/testdata/script/work_workfile.txt b/src/cmd/go/testdata/script/work_workfile.txt
deleted file mode 100644
index b62918147e..0000000000
--- a/src/cmd/go/testdata/script/work_workfile.txt
+++ /dev/null
@@ -1,21 +0,0 @@
-! go list -workfile=stop.work a # require absolute path
-! stderr panic
-! go list -workfile=doesnotexist a
-! stderr panic
-
-go list -n -workfile=$GOPATH/src/stop.work a
-go build -n -workfile=$GOPATH/src/stop.work a
-go test -n -workfile=$GOPATH/src/stop.work a
-
--- stop.work --
-go 1.18
-
-use ./a
--- a/a.go --
-package a
--- a/a_test.go --
-package a
--- a/go.mod --
-module a
-
-go 1.18
\ No newline at end of file
diff --git a/src/internal/cfg/cfg.go b/src/internal/cfg/cfg.go
index 4cb3fbd4f3..78664d7a96 100644
--- a/src/internal/cfg/cfg.go
+++ b/src/internal/cfg/cfg.go
@@ -62,6 +62,7 @@ const KnownEnv = `
 	GOTOOLDIR
 	GOVCS
 	GOWASM
+	GOWORK
 	GO_EXTLINK_ENABLED
 	PKG_CONFIG
 `