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diff --git a/‎src/cmd/go/internal/modfetch/cache.go‎
Lines changed: 1 addition & 1 deletion b/‎src/cmd/go/internal/modfetch/cache.go‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎src/cmd/go/testdata/script/mod_edit_no_modcache.txt‎
Lines changed: 15 additions & 0 deletions b/‎src/cmd/go/testdata/script/mod_edit_no_modcache.txt‎
Lines changed: 15 additions & 0 deletions
@@ -152,7 +152,7 @@ func lockVersion(mod module.Version) (unlock func(), err error) {
 // If err is nil, the caller MUST eventually call the unlock function.
 func SideLock() (unlock func(), err error) {
 	if err := checkCacheDir(); err != nil {
-		base.Fatalf("go: %v", err)
+		return nil, err
 	}
 
 	path := filepath.Join(cfg.GOMODCACHE, "cache", "lock")
 
@@ -0,0 +1,15 @@
+# 'go mod edit' opportunistically locks the side-lock file in the module cache,
+# for compatibility with older versions of the 'go' command.
+# It does not otherwise depend on the module cache, so it should not
+# fail if the module cache directory cannot be created.
+
+[root] skip
+
+mkdir $WORK/readonly
+chmod 0555 $WORK/readonly
+env GOPATH=$WORK/readonly/nonexist
+
+go mod edit -go=1.17
+
+-- go.mod --
+module example.com/m
Original file line number	Diff line number	Diff line change
`@@ -152,7 +152,7 @@ func lockVersion(mod module.Version) (unlock func(), err error) {`
`152`	`152`	`// If err is nil, the caller MUST eventually call the unlock function.`
`153`	`153`	`func SideLock() (unlock func(), err error) {`
`154`	`154`	`if err := checkCacheDir(); err != nil {`
`155`		`- base.Fatalf("go: %v", err)`
	`155`	`+ return nil, err`
`156`	`156`	`}`
`157`	`157`
`158`	`158`	`path := filepath.Join(cfg.GOMODCACHE, "cache", "lock")`