Replace custom inode-based file comparison with os.SameFile. (#36562)

Remove inode.go, inode_freebsd.go, and inode_windows.go, eliminating platform-specific inode lookup logic.
Replace sameFile function with os.SameFile, simplifying file comparison logic.

internal/configs/configload/copy_dir.go

@@ -30,11 +30,17 @@ func copyDir(dst, src string) error {
 		// destination with the path without the src on it.
 		dstPath := filepath.Join(dst, path[len(src):])
 
-		// we don't want to try and copy the same file over itself.
-		if eq, err := sameFile(path, dstPath); eq {
+		// Call os.Stat on dstPath to obtain os.FileInfo since os.SameFile
+		// requires FileInfo objects for comparison.
+		dstInfo, err := os.Stat(dstPath)
+		if err != nil {
+			if !os.IsNotExist(err) {
+				return err
+			}
+		} else if os.SameFile(info, dstInfo) {
+			// The destination file exists and is the same as the source file;
+			// skip copying.
 			return nil
-		} else if err != nil {
-			return err
 		}
 
 		// If we have a directory, make that subdirectory, then continue
@@ -86,33 +92,3 @@ func copyDir(dst, src string) error {
 
 	return filepath.Walk(src, walkFn)
 }
-
-// sameFile tried to determine if to paths are the same file.
-// If the paths don't match, we lookup the inode on supported systems.
-func sameFile(a, b string) (bool, error) {
-	if a == b {
-		return true, nil
-	}
-
-	aIno, err := inode(a)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return false, nil
-		}
-		return false, err
-	}
-
-	bIno, err := inode(b)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return false, nil
-		}
-		return false, err
-	}
-
-	if aIno > 0 && aIno == bIno {
-		return true, nil
-	}
-
-	return false, nil
-}

internal/configs/configload/inode.go

@@ -1,25 +0,0 @@
-// Copyright (c) HashiCorp, Inc.
-// SPDX-License-Identifier: BUSL-1.1
-
-//go:build linux || darwin || openbsd || netbsd || solaris || dragonfly
-// +build linux darwin openbsd netbsd solaris dragonfly
-
-package configload
-
-import (
-	"fmt"
-	"os"
-	"syscall"
-)
-
-// lookup the inode of a file on posix systems
-func inode(path string) (uint64, error) {
-	stat, err := os.Stat(path)
-	if err != nil {
-		return 0, err
-	}
-	if st, ok := stat.Sys().(*syscall.Stat_t); ok {
-		return st.Ino, nil
-	}
-	return 0, fmt.Errorf("could not determine file inode")
-}

internal/configs/configload/inode_freebsd.go

@@ -1,25 +0,0 @@
-// Copyright (c) HashiCorp, Inc.
-// SPDX-License-Identifier: BUSL-1.1
-
-//go:build freebsd
-// +build freebsd
-
-package configload
-
-import (
-	"fmt"
-	"os"
-	"syscall"
-)
-
-// lookup the inode of a file on posix systems
-func inode(path string) (uint64, error) {
-	stat, err := os.Stat(path)
-	if err != nil {
-		return 0, err
-	}
-	if st, ok := stat.Sys().(*syscall.Stat_t); ok {
-		return uint64(st.Ino), nil
-	}
-	return 0, fmt.Errorf("could not determine file inode")
-}

internal/configs/configload/inode_windows.go

@@ -1,12 +0,0 @@
-// Copyright (c) HashiCorp, Inc.
-// SPDX-License-Identifier: BUSL-1.1
-
-//go:build windows
-// +build windows
-
-package configload
-
-// no syscall.Stat_t on windows, return 0 for inodes
-func inode(path string) (uint64, error) {
-	return 0, nil
-}