Get initial Windows compilation working.

OS specific syscalls (mknod) and structs (Stat_t) are separated out.
Common unix functionality is collected in a node_unix.go file.
Direct use of syscall.Stat_t is replaced with an interface.

node.go

@@ -245,15 +245,15 @@ func (node Node) createSymlinkAt(path string) error {
 }
 
 func (node *Node) createDevAt(path string) error {
-	return syscall.Mknod(path, syscall.S_IFBLK|0600, int(node.Device))
+	return mknod(path, syscall.S_IFBLK|0600, int(node.Device))
 }
 
 func (node *Node) createCharDevAt(path string) error {
-	return syscall.Mknod(path, syscall.S_IFCHR|0600, int(node.Device))
+	return mknod(path, syscall.S_IFCHR|0600, int(node.Device))
 }
 
 func (node *Node) createFifoAt(path string) error {
-	return syscall.Mkfifo(path, 0600)
+	return mkfifo(path, 0600)
 }
 
 func (node Node) MarshalJSON() ([]byte, error) {
@@ -381,9 +381,19 @@ func (node *Node) isNewer(path string, fi os.FileInfo) bool {
 		return true
 	}
 
-	extendedStat := fi.Sys().(*syscall.Stat_t)
-	inode := extendedStat.Ino
-	size := uint64(extendedStat.Size)
+	size := uint64(fi.Size())
+
+	extendedStat, ok := toStatT(fi.Sys())
+	if !ok {
+		if node.ModTime != fi.ModTime() ||
+			node.Size != size {
+			debug.Log("node.isNewer", "node %v is newer: timestamp, size or inode changed", path)
+			return true
+		}
+		return false
+	}
+
+	inode := extendedStat.ino()
 
 	if node.ModTime != fi.ModTime() ||
 		node.ChangeTime != changeTime(extendedStat) ||
@@ -397,11 +407,11 @@ func (node *Node) isNewer(path string, fi os.FileInfo) bool {
 	return false
 }
 
-func (node *Node) fillUser(stat *syscall.Stat_t) error {
-	node.UID = stat.Uid
-	node.GID = stat.Gid
+func (node *Node) fillUser(stat statT) error {
+	node.UID = stat.uid()
+	node.GID = stat.gid()
 
-	username, err := lookupUsername(strconv.Itoa(int(stat.Uid)))
+	username, err := lookupUsername(strconv.Itoa(int(stat.uid())))
 	if err != nil {
 		return errors.Annotate(err, "fillUser")
 	}
@@ -439,12 +449,12 @@ func lookupUsername(uid string) (string, error) {
 }
 
 func (node *Node) fillExtra(path string, fi os.FileInfo) error {
-	stat, ok := fi.Sys().(*syscall.Stat_t)
+	stat, ok := toStatT(fi.Sys())
 	if !ok {
 		return nil
 	}
 
-	node.Inode = uint64(stat.Ino)
+	node.Inode = uint64(stat.ino())
 
 	node.fillTimes(stat)
 
@@ -456,15 +466,15 @@ func (node *Node) fillExtra(path string, fi os.FileInfo) error {
 
 	switch node.Type {
 	case "file":
-		node.Size = uint64(stat.Size)
-		node.Links = uint64(stat.Nlink)
+		node.Size = uint64(stat.size())
+		node.Links = uint64(stat.nlink())
 	case "dir":
 	case "symlink":
 		node.LinkTarget, err = os.Readlink(path)
 	case "dev":
-		node.Device = uint64(stat.Rdev)
+		node.Device = uint64(stat.rdev())
 	case "chardev":
-		node.Device = uint64(stat.Rdev)
+		node.Device = uint64(stat.rdev())
 	case "fifo":
 	case "socket":
 	default:
@@ -473,3 +483,32 @@ func (node *Node) fillExtra(path string, fi os.FileInfo) error {
 
 	return err
 }
+
+type statT interface {
+	dev() uint64
+	ino() uint64
+	nlink() uint64
+	uid() uint32
+	gid() uint32
+	rdev() uint64
+	size() int64
+	atim() syscall.Timespec
+	mtim() syscall.Timespec
+	ctim() syscall.Timespec
+}
+
+func mkfifo(path string, mode uint32) (err error) {
+	return mknod(path, mode|syscall.S_IFIFO, 0)
+}
+
+func (node *Node) fillTimes(stat statT) {
+	ctim := stat.ctim()
+	atim := stat.atim()
+	node.ChangeTime = time.Unix(ctim.Unix())
+	node.AccessTime = time.Unix(atim.Unix())
+}
+
+func changeTime(stat statT) time.Time {
+	ctim := stat.ctim()
+	return time.Unix(ctim.Unix())
+}

node_darwin.go

@@ -3,22 +3,16 @@ package restic
 import (
 	"os"
 	"syscall"
-	"time"
 )
 
 func (node *Node) OpenForReading() (*os.File, error) {
 	return os.Open(node.path)
 }
 
-func changeTime(stat *syscall.Stat_t) time.Time {
-	return time.Unix(stat.Ctimespec.Unix())
-}
-
-func (node *Node) fillTimes(stat *syscall.Stat_t) {
-	node.ChangeTime = time.Unix(stat.Ctimespec.Unix())
-	node.AccessTime = time.Unix(stat.Atimespec.Unix())
-}
-
 func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
 	return nil
 }
+
+func (s statUnix) atim() syscall.Timespec { return s.Atimespec }
+func (s statUnix) mtim() syscall.Timespec { return s.Mtimespec }
+func (s statUnix) ctim() syscall.Timespec { return s.Ctimespec }

node_freebsd.go

@@ -3,22 +3,16 @@ package restic
 import (
 	"os"
 	"syscall"
-	"time"
 )
 
 func (node *Node) OpenForReading() (*os.File, error) {
 	return os.OpenFile(node.path, os.O_RDONLY, 0)
 }
 
-func (node *Node) fillTimes(stat *syscall.Stat_t) {
-	node.ChangeTime = time.Unix(stat.Ctimespec.Unix())
-	node.AccessTime = time.Unix(stat.Atimespec.Unix())
-}
-
-func changeTime(stat *syscall.Stat_t) time.Time {
-	return time.Unix(stat.Ctimespec.Unix())
-}
-
 func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
 	return nil
 }
+
+func (s statUnix) atim() syscall.Timespec { return s.Atimespec }
+func (s statUnix) mtim() syscall.Timespec { return s.Mtimespec }
+func (s statUnix) ctim() syscall.Timespec { return s.Ctimespec }

node_linux.go

@@ -4,7 +4,6 @@ import (
 	"os"
 	"path/filepath"
 	"syscall"
-	"time"
 	"unsafe"
 
 	"github.com/juju/errors"
@@ -18,15 +17,6 @@ func (node *Node) OpenForReading() (*os.File, error) {
 	return file, err
 }
 
-func (node *Node) fillTimes(stat *syscall.Stat_t) {
-	node.ChangeTime = time.Unix(stat.Ctim.Unix())
-	node.AccessTime = time.Unix(stat.Atim.Unix())
-}
-
-func changeTime(stat *syscall.Stat_t) time.Time {
-	return time.Unix(stat.Ctim.Unix())
-}
-
 func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
 	dir, err := os.Open(filepath.Dir(path))
 	defer dir.Close()
@@ -65,3 +55,7 @@ func utimensat(dirfd int, path string, times *[2]syscall.Timespec, flags int) (e
 func utimesNanoAt(dirfd int, path string, ts [2]syscall.Timespec, flags int) (err error) {
 	return utimensat(dirfd, path, (*[2]syscall.Timespec)(unsafe.Pointer(&ts[0])), flags)
 }
+
+func (s statUnix) atim() syscall.Timespec { return s.Atim }
+func (s statUnix) mtim() syscall.Timespec { return s.Mtim }
+func (s statUnix) ctim() syscall.Timespec { return s.Ctim }

node_openbsd.go

@@ -3,7 +3,6 @@ package restic
 import (
 	"os"
 	"syscall"
-	"time"
 )
 
 func (node *Node) OpenForReading() (*os.File, error) {
@@ -14,15 +13,10 @@ func (node *Node) OpenForReading() (*os.File, error) {
 	return file, err
 }
 
-func (node *Node) fillTimes(stat *syscall.Stat_t) {
-	node.ChangeTime = time.Unix(stat.Ctim.Unix())
-	node.AccessTime = time.Unix(stat.Atim.Unix())
-}
-
-func changeTime(stat *syscall.Stat_t) time.Time {
-	return time.Unix(stat.Ctim.Unix())
-}
-
 func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
 	return nil
 }
+
+func (s statUnix) atim() syscall.Timespec { return s.Atim }
+func (s statUnix) mtim() syscall.Timespec { return s.Mtim }
+func (s statUnix) ctim() syscall.Timespec { return s.Ctim }

node_unix.go

@@ -0,0 +1,28 @@
+//
+
+// +build dragonfly linux netbsd openbsd solaris darwin
+
+package restic
+
+var mknod = syscall.Mknod
+
+type statUnix syscall.Stat_t
+
+func toStatT(i interface{}) (statT, bool) {
+	if i == nil {
+		return nil, false
+	}
+	s, ok := i.(syscall.Stat_t)
+	if ok && s != nil {
+		return statUnix(*s), true
+	}
+	return nil, false
+}
+
+func (s statUnix) dev() uint64   { return s.Dev }
+func (s statUnix) ino() uint64   { return s.Ino }
+func (s statUnix) nlink() uint64 { return s.Nlink }
+func (s statUnix) uid() uint32   { return s.Uid }
+func (s statUnix) gid() uint32   { return s.Gid }
+func (s statUnix) rdev() uint64  { return s.Rdev }
+func (s statUnix) size() int64   { return s.Size }

node_windows.go

@@ -0,0 +1,61 @@
+package restic
+
+import (
+	"os"
+	"syscall"
+)
+
+func (node *Node) OpenForReading() (*os.File, error) {
+	file, err := os.OpenFile(node.path, os.O_RDONLY, 0)
+	if os.IsPermission(err) {
+		return os.OpenFile(node.path, os.O_RDONLY, 0)
+	}
+	return file, err
+}
+
+// mknod() creates a filesystem node (file, device
+// special file, or named pipe) named pathname, with attributes
+// specified by mode and dev.
+var mknod = func(path string, mode uint32, dev int) (err error) {
+	panic("mknod not implemented")
+}
+
+func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
+	return nil
+}
+
+type statWin syscall.Win32FileAttributeData
+
+func toStatT(i interface{}) (statT, bool) {
+	if i == nil {
+		return nil, false
+	}
+	s, ok := i.(*syscall.Win32FileAttributeData)
+	if ok && s != nil {
+		return statWin(*s), true
+	}
+	return nil, false
+}
+
+func (s statWin) dev() uint64   { return 0 }
+func (s statWin) ino() uint64   { return 0 }
+func (s statWin) nlink() uint64 { return 0 }
+func (s statWin) uid() uint32   { return 0 }
+func (s statWin) gid() uint32   { return 0 }
+func (s statWin) rdev() uint64  { return 0 }
+
+func (s statWin) size() int64 {
+	return int64(s.FileSizeLow) | (int64(s.FileSizeHigh) << 32)
+}
+
+func (s statWin) atim() syscall.Timespec {
+	return syscall.NsecToTimespec(s.LastAccessTime.Nanoseconds())
+}
+
+func (s statWin) mtim() syscall.Timespec {
+	return syscall.NsecToTimespec(s.LastWriteTime.Nanoseconds())
+}
+
+func (s statWin) ctim() syscall.Timespec {
+	return syscall.NsecToTimespec(s.CreationTime.Nanoseconds())
+}