cmd/go: respect -mod flag in fmt

Fixes golang#27841 Change-Id: Ifcfd938aff8680cf7b44dfc09fde01d6105345a0
danp · Oct 1, 2019 · edd7538 · edd7538
1 parent a49067a
commit edd7538
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diff --git a/src/cmd/go/internal/base/flag.go b/src/cmd/go/internal/base/flag.go
@@ -33,3 +33,8 @@ func AddBuildFlagsNX(flags *flag.FlagSet) {
 	flags.BoolVar(&cfg.BuildN, "n", false, "")
 	flags.BoolVar(&cfg.BuildX, "x", false, "")
 }
+
+// AddLoadFlags adds the -mod build flag to the flag set.
+func AddLoadFlags(flags *flag.FlagSet) {
+	flags.StringVar(&cfg.BuildMod, "mod", "", "")
+}
diff --git a/src/cmd/go/internal/fmtcmd/fmt.go b/src/cmd/go/internal/fmtcmd/fmt.go
@@ -22,6 +22,7 @@ import (
 
 func init() {
 	base.AddBuildFlagsNX(&CmdFmt.Flag)
+	base.AddLoadFlags(&CmdFmt.Flag)
 }
 
 var CmdFmt = &base.Command{
@@ -38,6 +39,9 @@ For more about specifying packages, see 'go help packages'.
 The -n flag prints commands that would be executed.
 The -x flag prints commands as they are executed.
 
+The -mod flag's value sets which module download mode
+to use: readonly or vendor. See 'go help modules' for more.
+
 To run gofmt with specific options, run gofmt itself.
 
 See also: go fix, go vet.