check for OS filesystems

go.mod

@@ -1,9 +1,10 @@
 module github.com/mandelsoft/vfs
 
-go 1.19
+go 1.22.5
 
 require (
 	github.com/mandelsoft/filepath v0.0.0-20240223090642-3e2777258aa3
+	github.com/modern-go/reflect2 v1.0.2
 	github.com/onsi/ginkgo v1.14.0
 	github.com/onsi/gomega v1.10.1
 	gopkg.in/yaml.v2 v2.3.0

go.sum

@@ -13,12 +13,10 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
-github.com/mandelsoft/filepath v0.0.0-20200909114706-3df73d378d55 h1:mFdiUG86O2iW+iDEpZKXf64efMWO4JvDT+zN3znUGIc=
-github.com/mandelsoft/filepath v0.0.0-20200909114706-3df73d378d55/go.mod h1:n4xEiUD2HNHnn2w5ZKF0qgjDecHVCWAl5DxZ7+pcFU8=
-github.com/mandelsoft/filepath v0.0.0-20230412200429-36b1eb66bd27 h1:VivN6K8H4H0G4bUmeQH68fQIROL5c8S2iyvVe4teufc=
-github.com/mandelsoft/filepath v0.0.0-20230412200429-36b1eb66bd27/go.mod h1:LxhqC7khDoRENwooP6f/vWvia9ivj6TqLYrR39zqkN0=
 github.com/mandelsoft/filepath v0.0.0-20240223090642-3e2777258aa3 h1:oo9nIgnyiBgYPbcZslRT4y29siuL5EoNJ/t1tr0xEVQ=
 github.com/mandelsoft/filepath v0.0.0-20240223090642-3e2777258aa3/go.mod h1:LxhqC7khDoRENwooP6f/vWvia9ivj6TqLYrR39zqkN0=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/nxadm/tail v1.4.4 h1:DQuhQpB1tVlglWS2hLQ5OV6B5r8aGxSrPc5Qo6uTN78=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=

pkg/osfs/osfs.go

@@ -23,13 +23,33 @@ import (
 	"time"
 
 	"github.com/mandelsoft/filepath/pkg/filepath"
+	"github.com/modern-go/reflect2"
 
 	"github.com/mandelsoft/vfs/pkg/utils"
 	"github.com/mandelsoft/vfs/pkg/vfs"
 )
 
 var OsFs = &osFileSystem{}
 
+// OsFsCheck should be implemented by forwarding wrappers
+// to check for an OS Filesystem implementation.
+type OsFsCheck interface {
+	IsOsFileSystem() bool
+}
+
+func IsOsFileSystem(fs vfs.FileSystem) bool {
+	if reflect2.IsNil(fs) {
+		return false
+	}
+	if _, ok := fs.(*osFileSystem); ok {
+		return true
+	}
+	if c, ok := fs.(OsFsCheck); ok {
+		return c.IsOsFileSystem()
+	}
+	return false
+}
+
 type osFileSystem struct {
 }