all: update references to symbols moved from os to io/fs

The old os references are still valid, but update our code
to reflect best practices and get used to the new locations.

Code compiled with the bootstrap toolchain
(cmd/asm, cmd/dist, cmd/compile, debug/elf)
must remain Go 1.4-compatible and is excluded.

For #41190.

Change-Id: I8f9526977867c10a221e2f392f78d7dec073f1bd
Reviewed-on: https://go-review.googlesource.com/c/go/+/243907
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

6 files changed, 13 insertions, 10 deletions

diff --git a/src/os/exec/exec_plan9.go b/src/os/exec/exec_plan9.go
index d90bd04399..21ac7b765f 100644
--- a/src/os/exec/exec_plan9.go
+++ b/src/os/exec/exec_plan9.go
@@ -4,14 +4,14 @@
 
 package exec
 
-import "os"
+import "io/fs"
 
 func init() {
 	skipStdinCopyError = func(err error) bool {
 		// Ignore hungup errors copying to stdin if the program
 		// completed successfully otherwise.
 		// See Issue 35753.
-		pe, ok := err.(*os.PathError)
+		pe, ok := err.(*fs.PathError)
 		return ok &&
 			pe.Op == "write" && pe.Path == "|1" &&
 			pe.Err.Error() == "i/o on hungup channel"
diff --git a/src/os/exec/exec_unix.go b/src/os/exec/exec_unix.go
index 9c3e17d23a..51c52427c2 100644
--- a/src/os/exec/exec_unix.go
+++ b/src/os/exec/exec_unix.go
@@ -7,7 +7,7 @@
 package exec
 
 import (
-	"os"
+	"io/fs"
 	"syscall"
 )
 
@@ -16,7 +16,7 @@ func init() {
 		// Ignore EPIPE errors copying to stdin if the program
 		// completed successfully otherwise.
 		// See Issue 9173.
-		pe, ok := err.(*os.PathError)
+		pe, ok := err.(*fs.PathError)
 		return ok &&
 			pe.Op == "write" && pe.Path == "|1" &&
 			pe.Err == syscall.EPIPE
diff --git a/src/os/exec/exec_windows.go b/src/os/exec/exec_windows.go
index af8cd97218..bb937f8aed 100644
--- a/src/os/exec/exec_windows.go
+++ b/src/os/exec/exec_windows.go
@@ -5,7 +5,7 @@
 package exec
 
 import (
-	"os"
+	"io/fs"
 	"syscall"
 )
 
@@ -15,7 +15,7 @@ func init() {
 		// to stdin if the program completed successfully otherwise.
 		// See Issue 20445.
 		const _ERROR_NO_DATA = syscall.Errno(0xe8)
-		pe, ok := err.(*os.PathError)
+		pe, ok := err.(*fs.PathError)
 		return ok &&
 			pe.Op == "write" && pe.Path == "|1" &&
 			(pe.Err == syscall.ERROR_BROKEN_PIPE || pe.Err == _ERROR_NO_DATA)
diff --git a/src/os/exec/lp_plan9.go b/src/os/exec/lp_plan9.go
index 5860cbca4d..e8826a5083 100644
--- a/src/os/exec/lp_plan9.go
+++ b/src/os/exec/lp_plan9.go
@@ -6,6 +6,7 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -22,7 +23,7 @@ func findExecutable(file string) error {
 	if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
 		return nil
 	}
-	return os.ErrPermission
+	return fs.ErrPermission
 }
 
 // LookPath searches for an executable named file in the
diff --git a/src/os/exec/lp_unix.go b/src/os/exec/lp_unix.go
index 93793e0eee..66c1df76fb 100644
--- a/src/os/exec/lp_unix.go
+++ b/src/os/exec/lp_unix.go
@@ -8,6 +8,7 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -24,7 +25,7 @@ func findExecutable(file string) error {
 	if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
 		return nil
 	}
-	return os.ErrPermission
+	return fs.ErrPermission
 }
 
 // LookPath searches for an executable named file in the
diff --git a/src/os/exec/lp_windows.go b/src/os/exec/lp_windows.go
index 9ea3d76575..e7a2cdf142 100644
--- a/src/os/exec/lp_windows.go
+++ b/src/os/exec/lp_windows.go
@@ -6,6 +6,7 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -20,7 +21,7 @@ func chkStat(file string) error {
 		return err
 	}
 	if d.IsDir() {
-		return os.ErrPermission
+		return fs.ErrPermission
 	}
 	return nil
 }
@@ -47,7 +48,7 @@ func findExecutable(file string, exts []string) (string, error) {
 			return f, nil
 		}
 	}
-	return "", os.ErrNotExist
+	return "", fs.ErrNotExist
 }
 
 // LookPath searches for an executable named file in the