Merge pull request #297 from alcortesm/issue274

issue #274: new filemode package

14 files changed, 757 insertions, 255 deletions

diff --git a/plumbing/filemode/filemode.go b/plumbing/filemode/filemode.go
new file mode 100644
index 0000000..0994bc4
--- /dev/null
+++ b/plumbing/filemode/filemode.go
@@ -0,0 +1,188 @@
+package filemode
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+// A FileMode represents the kind of tree entries used by git. It
+// resembles regular file systems modes, although FileModes are
+// considerably simpler (there are not so many), and there are some,
+// like Submodule that has no file system equivalent.
+type FileMode uint32
+
+const (
+	// Empty is used as the FileMode of tree elements when comparing
+	// trees in the following situations:
+	//
+	// - the mode of tree elements before their creation.  - the mode of
+	// tree elements after their deletion.  - the mode of unmerged
+	// elements when checking the index.
+	//
+	// Empty has no file system equivalent.  As Empty is the zero value
+	// of FileMode, it is also returned by New and
+	// NewFromOsNewFromOSFileMode along with an error, when they fail.
+	Empty FileMode = 0
+	// Dir represent a Directory.
+	Dir FileMode = 0040000
+	// Regular represent non-executable files.  Please note this is not
+	// the same as golang regular files, which include executable files.
+	Regular FileMode = 0100644
+	// Deprecated represent non-executable files with the group writable
+	// bit set.  This mode was supported by the first versions of git,
+	// but it has been deprecatred nowadays.  This library uses them
+	// internally, so you can read old packfiles, but will treat them as
+	// Regulars when interfacing with the outside world.  This is the
+	// standard git behaviuor.
+	Deprecated FileMode = 0100664
+	// Executable represents executable files.
+	Executable FileMode = 0100755
+	// Symlink represents symbolic links to files.
+	Symlink FileMode = 0120000
+	// Submodule represents git submodules.  This mode has no file system
+	// equivalent.
+	Submodule FileMode = 0160000
+)
+
+// New takes the octal string representation of a FileMode and returns
+// the FileMode and a nil error.  If the string can not be parsed to a
+// 32 bit unsigned octal number, it returns Empty and the parsing error.
+//
+// Example: "40000" means Dir, "100644" means Regular.
+//
+// Please note this function does not check if the returned FileMode
+// is valid in git or if it is malformed.  For instance, "1" will
+// return the malformed FileMode(1) and a nil error.
+func New(s string) (FileMode, error) {
+	n, err := strconv.ParseUint(s, 8, 32)
+	if err != nil {
+		return Empty, err
+	}
+
+	return FileMode(n), nil
+}
+
+// NewFromOSFileMode returns the FileMode used by git to represent
+// the provided file system modes and a nil error on success.  If the
+// file system mode cannot be mapped to any valid git mode (as with
+// sockets or named pipes), it will return Empty and an error.
+//
+// Note that some git modes cannot be generated from os.FileModes, like
+// Deprecated and Submodule; while Empty will be returned, along with an
+// error, only when the method fails.
+func NewFromOSFileMode(m os.FileMode) (FileMode, error) {
+	if m.IsRegular() {
+		if isSetTemporary(m) {
+			return Empty, fmt.Errorf("no equivalent git mode for %s", m)
+		}
+		if isSetCharDevice(m) {
+			return Empty, fmt.Errorf("no equivalent git mode for %s", m)
+		}
+		if isSetUserExecutable(m) {
+			return Executable, nil
+		}
+		return Regular, nil
+	}
+
+	if m.IsDir() {
+		return Dir, nil
+	}
+
+	if isSetSymLink(m) {
+		return Symlink, nil
+	}
+
+	return Empty, fmt.Errorf("no equivalent git mode for %s", m)
+}
+
+func isSetCharDevice(m os.FileMode) bool {
+	return m&os.ModeCharDevice != 0
+}
+
+func isSetTemporary(m os.FileMode) bool {
+	return m&os.ModeTemporary != 0
+}
+
+func isSetUserExecutable(m os.FileMode) bool {
+	return m&0100 != 0
+}
+
+func isSetSymLink(m os.FileMode) bool {
+	return m&os.ModeSymlink != 0
+}
+
+// Bytes return a slice of 4 bytes with the mode in little endian
+// encoding.
+func (m FileMode) Bytes() []byte {
+	ret := make([]byte, 4)
+	binary.LittleEndian.PutUint32(ret, uint32(m))
+	return ret[:]
+}
+
+// IsMalformed returns if the FileMode should not appear in a git packfile,
+// this is: Empty and any other mode not mentioned as a constant in this
+// package.
+func (m FileMode) IsMalformed() bool {
+	return m != Dir &&
+		m != Regular &&
+		m != Deprecated &&
+		m != Executable &&
+		m != Symlink &&
+		m != Submodule
+}
+
+// String returns the FileMode as a string in the standatd git format,
+// this is, an octal number padded with ceros to 7 digits.  Malformed
+// modes are printed in that same format, for easier debugging.
+//
+// Example: Regular is "0100644", Empty is "0000000".
+func (m FileMode) String() string {
+	return fmt.Sprintf("%07o", uint32(m))
+}
+
+// IsRegular returns if the FileMode represents that of a regular file,
+// this is, either Regular or Deprecated.  Please note that Executable
+// are not regular even though in the UNIX tradition, they usually are:
+// See the IsFile method.
+func (m FileMode) IsRegular() bool {
+	return m == Regular ||
+		m == Deprecated
+}
+
+// IsFile returns if the FileMode represents that of a file, this is,
+// Regular, Deprecated, Excutable or Link.
+func (m FileMode) IsFile() bool {
+	return m == Regular ||
+		m == Deprecated ||
+		m == Executable ||
+		m == Symlink
+}
+
+// ToOSFileMode returns the os.FileMode to be used when creating file
+// system elements with the given git mode and a nil error on success.
+//
+// When the provided mode cannot be mapped to a valid file system mode
+// (e.g.  Submodule) it returns os.FileMode(0) and an error.
+//
+// The returned file mode does not take into account the umask.
+func (m FileMode) ToOSFileMode() (os.FileMode, error) {
+	switch m {
+	case Dir:
+		return os.ModePerm | os.ModeDir, nil
+	case Submodule:
+		return os.ModePerm | os.ModeDir, nil
+	case Regular:
+		return os.FileMode(0644), nil
+	// Deprecated is no longer allowed: treated as a Regular instead
+	case Deprecated:
+		return os.FileMode(0644), nil
+	case Executable:
+		return os.FileMode(0755), nil
+	case Symlink:
+		return os.ModePerm | os.ModeSymlink, nil
+	}
+
+	return os.FileMode(0), fmt.Errorf("malformed mode (%s)", m)
+}
diff --git a/plumbing/filemode/filemode_test.go b/plumbing/filemode/filemode_test.go
new file mode 100644
index 0000000..299c96a
--- /dev/null
+++ b/plumbing/filemode/filemode_test.go
@@ -0,0 +1,348 @@
+package filemode
+
+import (
+	"os"
+	"testing"
+
+	. "gopkg.in/check.v1"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type ModeSuite struct{}
+
+var _ = Suite(&ModeSuite{})
+
+func (s *ModeSuite) TestNew(c *C) {
+	for _, test := range [...]struct {
+		input    string
+		expected FileMode
+	}{
+		// these are the ones used in the packfile codification
+		// of the tree entries
+		{input: "40000", expected: Dir},
+		{input: "100644", expected: Regular},
+		{input: "100664", expected: Deprecated},
+		{input: "100755", expected: Executable},
+		{input: "120000", expected: Symlink},
+		{input: "160000", expected: Submodule},
+		// these are are not used by standard git to codify modes in
+		// packfiles, but they often appear when parsing some git
+		// outputs ("git diff-tree", for instance).
+		{input: "000000", expected: Empty},
+		{input: "040000", expected: Dir},
+		// these are valid inputs, but probably means there is a bug
+		// somewhere.
+		{input: "0", expected: Empty},
+		{input: "42", expected: FileMode(042)},
+		{input: "00000000000100644", expected: Regular},
+	} {
+		comment := Commentf("input = %q", test.input)
+		obtained, err := New(test.input)
+		c.Assert(obtained, Equals, test.expected, comment)
+		c.Assert(err, IsNil, comment)
+	}
+}
+
+func (s *ModeSuite) TestNewErrors(c *C) {
+	for _, input := range [...]string{
+		"0x81a4",     // Regular in hex
+		"-rw-r--r--", // Regular in default UNIX representation
+		"",
+		"-42",
+		"9",  // this is no octal
+		"09", // looks like octal, but it is not
+		"mode",
+		"-100644",
+		"+100644",
+	} {
+		comment := Commentf("input = %q", input)
+		obtained, err := New(input)
+		c.Assert(obtained, Equals, Empty, comment)
+		c.Assert(err, Not(IsNil), comment)
+	}
+}
+
+// fixtures for testing NewModeFromOSFileMode
+type fixture struct {
+	input    os.FileMode
+	expected FileMode
+	err      string // error regexp, empty string for nil error
+}
+
+func (f fixture) test(c *C) {
+	obtained, err := NewFromOSFileMode(f.input)
+	comment := Commentf("input = %s (%07o)", f.input, uint32(f.input))
+	c.Assert(obtained, Equals, f.expected, comment)
+	if f.err != "" {
+		c.Assert(err, ErrorMatches, f.err, comment)
+	} else {
+		c.Assert(err, IsNil, comment)
+	}
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeSimplePerms(c *C) {
+	for _, f := range [...]fixture{
+		{os.FileMode(0755) | os.ModeDir, Dir, ""},         // drwxr-xr-x
+		{os.FileMode(0700) | os.ModeDir, Dir, ""},         // drwx------
+		{os.FileMode(0500) | os.ModeDir, Dir, ""},         // dr-x------
+		{os.FileMode(0644), Regular, ""},                  // -rw-r--r--
+		{os.FileMode(0660), Regular, ""},                  // -rw-rw----
+		{os.FileMode(0640), Regular, ""},                  // -rw-r-----
+		{os.FileMode(0600), Regular, ""},                  // -rw-------
+		{os.FileMode(0400), Regular, ""},                  // -r--------
+		{os.FileMode(0000), Regular, ""},                  // ----------
+		{os.FileMode(0755), Executable, ""},               // -rwxr-xr-x
+		{os.FileMode(0700), Executable, ""},               // -rwx------
+		{os.FileMode(0500), Executable, ""},               // -r-x------
+		{os.FileMode(0744), Executable, ""},               // -rwxr--r--
+		{os.FileMode(0540), Executable, ""},               // -r-xr-----
+		{os.FileMode(0550), Executable, ""},               // -r-xr-x---
+		{os.FileMode(0777) | os.ModeSymlink, Symlink, ""}, // Lrwxrwxrwx
+	} {
+		f.test(c)
+	}
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeAppend(c *C) {
+	// append files are just regular files
+	fixture{
+		input:    os.FileMode(0644) | os.ModeAppend, // arw-r--r--
+		expected: Regular, err: "",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeExclusive(c *C) {
+	// exclusive files are just regular or executable files
+	fixture{
+		input:    os.FileMode(0644) | os.ModeExclusive, // lrw-r--r--
+		expected: Regular, err: "",
+	}.test(c)
+
+	fixture{
+		input:    os.FileMode(0755) | os.ModeExclusive, // lrwxr-xr-x
+		expected: Executable, err: "",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeTemporary(c *C) {
+	// temporaty files are ignored
+	fixture{
+		input:    os.FileMode(0644) | os.ModeTemporary, // Trw-r--r--
+		expected: Empty, err: "no equivalent.*",
+	}.test(c)
+
+	fixture{
+		input:    os.FileMode(0755) | os.ModeTemporary, // Trwxr-xr-x
+		expected: Empty, err: "no equivalent.*",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeDevice(c *C) {
+	// device files has no git equivalent
+	fixture{
+		input:    os.FileMode(0644) | os.ModeDevice, // Drw-r--r--
+		expected: Empty, err: "no equivalent.*",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileNamedPipe(c *C) {
+	// named pipes files has not git equivalent
+	fixture{
+		input:    os.FileMode(0644) | os.ModeNamedPipe, // prw-r--r--
+		expected: Empty, err: "no equivalent.*",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeSocket(c *C) {
+	// sockets has no git equivalent
+	fixture{
+		input:    os.FileMode(0644) | os.ModeSocket, // Srw-r--r--
+		expected: Empty, err: "no equivalent.*",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeSetuid(c *C) {
+	// Setuid are just executables
+	fixture{
+		input:    os.FileMode(0755) | os.ModeSetuid, // urwxr-xr-x
+		expected: Executable, err: "",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeSetgid(c *C) {
+	// Setguid are regular or executables, depending on the owner perms
+	fixture{
+		input:    os.FileMode(0644) | os.ModeSetgid, // grw-r--r--
+		expected: Regular, err: "",
+	}.test(c)
+
+	fixture{
+		input:    os.FileMode(0755) | os.ModeSetgid, // grwxr-xr-x
+		expected: Executable, err: "",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeCharDevice(c *C) {
+	// char devices has no git equivalent
+	fixture{
+		input:    os.FileMode(0644) | os.ModeCharDevice, // crw-r--r--
+		expected: Empty, err: "no equivalent.*",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestNewFromOsFileModeSticky(c *C) {
+	// dirs with the sticky bit are just dirs
+	fixture{
+		input:    os.FileMode(0755) | os.ModeDir | os.ModeSticky, // dtrwxr-xr-x
+		expected: Dir, err: "",
+	}.test(c)
+}
+
+func (s *ModeSuite) TestByte(c *C) {
+	for _, test := range [...]struct {
+		input    FileMode
+		expected []byte
+	}{
+		{FileMode(0), []byte{0x00, 0x00, 0x00, 0x00}},
+		{FileMode(1), []byte{0x01, 0x00, 0x00, 0x00}},
+		{FileMode(15), []byte{0x0f, 0x00, 0x00, 0x00}},
+		{FileMode(16), []byte{0x10, 0x00, 0x00, 0x00}},
+		{FileMode(255), []byte{0xff, 0x00, 0x00, 0x00}},
+		{FileMode(256), []byte{0x00, 0x01, 0x00, 0x00}},
+		{Empty, []byte{0x00, 0x00, 0x00, 0x00}},
+		{Dir, []byte{0x00, 0x40, 0x00, 0x00}},
+		{Regular, []byte{0xa4, 0x81, 0x00, 0x00}},
+		{Deprecated, []byte{0xb4, 0x81, 0x00, 0x00}},
+		{Executable, []byte{0xed, 0x81, 0x00, 0x00}},
+		{Symlink, []byte{0x00, 0xa0, 0x00, 0x00}},
+		{Submodule, []byte{0x00, 0xe0, 0x00, 0x00}},
+	} {
+		c.Assert(test.input.Bytes(), DeepEquals, test.expected,
+			Commentf("input = %s", test.input))
+	}
+}
+
+func (s *ModeSuite) TestIsMalformed(c *C) {
+	for _, test := range [...]struct {
+		mode     FileMode
+		expected bool
+	}{
+		{Empty, true},
+		{Dir, false},
+		{Regular, false},
+		{Deprecated, false},
+		{Executable, false},
+		{Symlink, false},
+		{Submodule, false},
+		{FileMode(01), true},
+		{FileMode(010), true},
+		{FileMode(0100), true},
+		{FileMode(01000), true},
+		{FileMode(010000), true},
+		{FileMode(0100000), true},
+	} {
+		c.Assert(test.mode.IsMalformed(), Equals, test.expected)
+	}
+}
+
+func (s *ModeSuite) TestString(c *C) {
+	for _, test := range [...]struct {
+		mode     FileMode
+		expected string
+	}{
+		{Empty, "0000000"},
+		{Dir, "0040000"},
+		{Regular, "0100644"},
+		{Deprecated, "0100664"},
+		{Executable, "0100755"},
+		{Symlink, "0120000"},
+		{Submodule, "0160000"},
+		{FileMode(01), "0000001"},
+		{FileMode(010), "0000010"},
+		{FileMode(0100), "0000100"},
+		{FileMode(01000), "0001000"},
+		{FileMode(010000), "0010000"},
+		{FileMode(0100000), "0100000"},
+	} {
+		c.Assert(test.mode.String(), Equals, test.expected)
+	}
+}
+
+func (s *ModeSuite) TestIsRegular(c *C) {
+	for _, test := range [...]struct {
+		mode     FileMode
+		expected bool
+	}{
+		{Empty, false},
+		{Dir, false},
+		{Regular, true},
+		{Deprecated, true},
+		{Executable, false},
+		{Symlink, false},
+		{Submodule, false},
+		{FileMode(01), false},
+		{FileMode(010), false},
+		{FileMode(0100), false},
+		{FileMode(01000), false},
+		{FileMode(010000), false},
+		{FileMode(0100000), false},
+	} {
+		c.Assert(test.mode.IsRegular(), Equals, test.expected)
+	}
+}
+
+func (s *ModeSuite) TestIsFile(c *C) {
+	for _, test := range [...]struct {
+		mode     FileMode
+		expected bool
+	}{
+		{Empty, false},
+		{Dir, false},
+		{Regular, true},
+		{Deprecated, true},
+		{Executable, true},
+		{Symlink, true},
+		{Submodule, false},
+		{FileMode(01), false},
+		{FileMode(010), false},
+		{FileMode(0100), false},
+		{FileMode(01000), false},
+		{FileMode(010000), false},
+		{FileMode(0100000), false},
+	} {
+		c.Assert(test.mode.IsFile(), Equals, test.expected)
+	}
+}
+
+func (s *ModeSuite) TestToOSFileMode(c *C) {
+	for _, test := range [...]struct {
+		input     FileMode
+		expected  os.FileMode
+		errRegExp string // empty string for nil error
+	}{
+		{Empty, os.FileMode(0), "malformed.*"},
+		{Dir, os.ModePerm | os.ModeDir, ""},
+		{Regular, os.FileMode(0644), ""},
+		{Deprecated, os.FileMode(0644), ""},
+		{Executable, os.FileMode(0755), ""},
+		{Symlink, os.ModePerm | os.ModeSymlink, ""},
+		{Submodule, os.ModePerm | os.ModeDir, ""},
+		{FileMode(01), os.FileMode(0), "malformed.*"},
+		{FileMode(010), os.FileMode(0), "malformed.*"},
+		{FileMode(0100), os.FileMode(0), "malformed.*"},
+		{FileMode(01000), os.FileMode(0), "malformed.*"},
+		{FileMode(010000), os.FileMode(0), "malformed.*"},
+		{FileMode(0100000), os.FileMode(0), "malformed.*"},
+	} {
+		obtained, err := test.input.ToOSFileMode()
+		comment := Commentf("input = %s", test.input)
+		if test.errRegExp != "" {
+			c.Assert(obtained, Equals, os.FileMode(0), comment)
+			c.Assert(err, ErrorMatches, test.errRegExp, comment)
+		} else {
+			c.Assert(obtained, Equals, test.expected, comment)
+			c.Assert(err, IsNil, comment)
+		}
+	}
+}
diff --git a/plumbing/format/index/decoder_test.go b/plumbing/format/index/decoder_test.go
index 1ffbe75..3a6e0d4 100644
--- a/plumbing/format/index/decoder_test.go
+++ b/plumbing/format/index/decoder_test.go
@@ -3,9 +3,11 @@ package index
 import (
 	"testing"
 
-	. "gopkg.in/check.v1"
-	"github.com/src-d/go-git-fixtures"
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
+
+	"github.com/src-d/go-git-fixtures"
+	. "gopkg.in/check.v1"
 )
 
 func Test(t *testing.T) { TestingT(t) }
@@ -53,7 +55,7 @@ func (s *IndexSuite) TestDecodeEntries(c *C) {
 	c.Assert(e.Size, Equals, uint32(189))
 	c.Assert(e.Hash.String(), Equals, "32858aad3c383ed1ff0a0f9bdf231d54a00c9e88")
 	c.Assert(e.Name, Equals, ".gitignore")
-	c.Assert(e.Mode.String(), Equals, "-rw-r--r--")
+	c.Assert(e.Mode, Equals, filemode.Regular)
 
 	e = idx.Entries[1]
 	c.Assert(e.Name, Equals, "CHANGELOG")
diff --git a/plumbing/format/index/index.go b/plumbing/format/index/index.go
index a95dba2..e706058 100644
--- a/plumbing/format/index/index.go
+++ b/plumbing/format/index/index.go
@@ -2,10 +2,10 @@ package index
 
 import (
 	"errors"
-	"os"
 	"time"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 )
 
 var (
@@ -62,7 +62,7 @@ type Entry struct {
 	// Dev and Inode of the tracked path
 	Dev, Inode uint32
 	// Mode of the path
-	Mode os.FileMode
+	Mode filemode.FileMode
 	// UID and GID, userid and group id of the owner
 	UID, GID uint32
 	// Size is the length in bytes for regular files
diff --git a/plumbing/object/change_adaptor_test.go b/plumbing/object/change_adaptor_test.go
index fb2636b..b42a3b3 100644
--- a/plumbing/object/change_adaptor_test.go
+++ b/plumbing/object/change_adaptor_test.go
@@ -1,10 +1,10 @@
 package object
 
 import (
-	"os"
 	"sort"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/storage/filesystem"
 	"srcd.works/go-git.v4/utils/merkletrie"
@@ -51,7 +51,7 @@ func newPath(nn ...noder.Noder) noder.Path { return noder.Path(nn) }
 
 func (s *ChangeAdaptorSuite) TestTreeNoderHashHasMode(c *C) {
 	hash := plumbing.NewHash("aaaa")
-	mode := FileMode
+	mode := filemode.Regular
 
 	treeNoder := &treeNoder{
 		hash: hash,
@@ -64,8 +64,8 @@ func (s *ChangeAdaptorSuite) TestTreeNoderHashHasMode(c *C) {
 		0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00,
 		0x00, 0x00, 0x00, 0x00,
-		0xa4, 0x81, 0x00, 0x00, // object.FileMode in little endian
 	}
+	expected = append(expected, filemode.Regular.Bytes()...)
 
 	c.Assert(treeNoder.Hash(), DeepEquals, expected)
 }
@@ -74,7 +74,7 @@ func (s *ChangeAdaptorSuite) TestNewChangeInsert(c *C) {
 	tree := &Tree{}
 	entry := TreeEntry{
 		Name: "name",
-		Mode: os.FileMode(42),
+		Mode: filemode.FileMode(42),
 		Hash: plumbing.NewHash("aaaaa"),
 	}
 	path := newPath(newNoder(tree, entry))
@@ -100,7 +100,7 @@ func (s *ChangeAdaptorSuite) TestNewChangeDelete(c *C) {
 	tree := &Tree{}
 	entry := TreeEntry{
 		Name: "name",
-		Mode: os.FileMode(42),
+		Mode: filemode.FileMode(42),
 		Hash: plumbing.NewHash("aaaaa"),
 	}
 	path := newPath(newNoder(tree, entry))
@@ -126,7 +126,7 @@ func (s *ChangeAdaptorSuite) TestNewChangeModify(c *C) {
 	treeA := &Tree{}
 	entryA := TreeEntry{
 		Name: "name",
-		Mode: os.FileMode(42),
+		Mode: filemode.FileMode(42),
 		Hash: plumbing.NewHash("aaaaa"),
 	}
 	pathA := newPath(newNoder(treeA, entryA))
@@ -136,7 +136,7 @@ func (s *ChangeAdaptorSuite) TestNewChangeModify(c *C) {
 	treeB := &Tree{}
 	entryB := TreeEntry{
 		Name: "name",
-		Mode: os.FileMode(42),
+		Mode: filemode.FileMode(42),
 		Hash: plumbing.NewHash("bbbb"),
 	}
 	pathB := newPath(newNoder(treeB, entryB))
@@ -295,7 +295,7 @@ func (s *ChangeAdaptorSuite) TestChangeEntryFromSortPath(c *C) {
 	tree := &Tree{}
 	entry := TreeEntry{
 		Name: "name",
-		Mode: os.FileMode(42),
+		Mode: filemode.FileMode(42),
 		Hash: plumbing.NewHash("aaaaa"),
 	}
 	path := newPath(newNoder(tree, entry))
@@ -312,14 +312,14 @@ func (s *ChangeAdaptorSuite) TestChangeEntryFromLongPath(c *C) {
 	treeA := &Tree{}
 	entryA := TreeEntry{
 		Name: "nameA",
-		Mode: os.FileMode(42),
+		Mode: filemode.FileMode(42),
 		Hash: plumbing.NewHash("aaaa"),
 	}
 
 	treeB := &Tree{}
 	entryB := TreeEntry{
 		Name: "nameB",
-		Mode: os.FileMode(24),
+		Mode: filemode.FileMode(24),
 		Hash: plumbing.NewHash("bbbb"),
 	}
 
diff --git a/plumbing/object/change_test.go b/plumbing/object/change_test.go
index b47e92a..4a144fa 100644
--- a/plumbing/object/change_test.go
+++ b/plumbing/object/change_test.go
@@ -1,10 +1,10 @@
 package object
 
 import (
-	"os"
 	"sort"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/storage/filesystem"
 	"srcd.works/go-git.v4/utils/merkletrie"
@@ -48,7 +48,7 @@ func (s *ChangeSuite) TestInsert(c *C) {
 
 	path := "examples/clone/main.go"
 	name := "main.go"
-	mode := os.FileMode(100644)
+	mode := filemode.Regular
 	blob := plumbing.NewHash("f95dc8f7923add1a8b9f72ecb1e8db1402de601a")
 	tree := plumbing.NewHash("6efca3ff41cab651332f9ebc0c96bb26be809615")
 
@@ -94,7 +94,7 @@ func (s *ChangeSuite) TestDelete(c *C) {
 
 	path := "utils/difftree/difftree.go"
 	name := "difftree.go"
-	mode := os.FileMode(100644)
+	mode := filemode.Regular
 	blob := plumbing.NewHash("e2cb9a5719daf634d45a063112b4044ee81da13e")
 	tree := plumbing.NewHash("f3d11566401ce4b0808aab9dd6fad3d5abf1481a")
 
@@ -142,7 +142,7 @@ func (s *ChangeSuite) TestModify(c *C) {
 
 	path := "utils/difftree/difftree.go"
 	name := "difftree.go"
-	mode := os.FileMode(100644)
+	mode := filemode.Regular
 	fromBlob := plumbing.NewHash("05f583ace3a9a078d8150905a53a4d82567f125f")
 	fromTree := plumbing.NewHash("b1f01b730b855c82431918cb338ad47ed558999b")
 	toBlob := plumbing.NewHash("de927fad935d172929aacf20e71f3bf0b91dd6f9")
@@ -215,7 +215,7 @@ func (s *ChangeSuite) TestErrorsFindingChildsAreDetected(c *C) {
 
 	path := "utils/difftree/difftree.go"
 	name := "difftree.go"
-	mode := os.FileMode(100644)
+	mode := filemode.Regular
 	fromBlob := plumbing.NewHash("aaaa") // does not exists
 	fromTree := plumbing.NewHash("b1f01b730b855c82431918cb338ad47ed558999b")
 	toBlob := plumbing.NewHash("bbbb") // does not exists
diff --git a/plumbing/object/difftree.go b/plumbing/object/difftree.go
index e6e0cb0..bcc78ad 100644
--- a/plumbing/object/difftree.go
+++ b/plumbing/object/difftree.go
@@ -2,8 +2,8 @@ package object
 
 import (
 	"bytes"
-	"os"
 
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/utils/merkletrie"
 	"srcd.works/go-git.v4/utils/merkletrie/noder"
 )
@@ -49,14 +49,11 @@ func equivalentMode(a, b []byte) bool {
 }
 
 var (
-	file           = modeToBytes(FileMode)
-	fileDeprecated = modeToBytes(FileModeDeprecated)
-	// remove this by fixing plumbing.Object mode ASAP
-	fileGoGit = modeToBytes(os.FileMode(0644))
+	file           = filemode.Regular.Bytes()
+	fileDeprecated = filemode.Deprecated.Bytes()
 )
 
 func isFilish(b []byte) bool {
 	return bytes.Equal(b, file) ||
-		bytes.Equal(b, fileDeprecated) ||
-		bytes.Equal(b, fileGoGit)
+		bytes.Equal(b, fileDeprecated)
 }
diff --git a/plumbing/object/difftree_test.go b/plumbing/object/difftree_test.go
index 594c49d..fa996c2 100644
--- a/plumbing/object/difftree_test.go
+++ b/plumbing/object/difftree_test.go
@@ -1,10 +1,10 @@
 package object
 
 import (
-	"os"
 	"sort"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/format/packfile"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/storage/filesystem"
@@ -362,11 +362,11 @@ func (s *DiffTreeSuite) TestIssue279(c *C) {
 	// mode to a 100644 or vice versa.
 	from := &treeNoder{
 		hash: plumbing.NewHash("d08e895238bac36d8220586fdc28c27e1a7a76d3"),
-		mode: os.FileMode(0100664),
+		mode: filemode.Regular,
 	}
 	to := &treeNoder{
 		hash: plumbing.NewHash("d08e895238bac36d8220586fdc28c27e1a7a76d3"),
-		mode: os.FileMode(0100644),
+		mode: filemode.Regular,
 	}
 	c.Assert(hashEqual(from, to), Equals, true)
 	c.Assert(hashEqual(to, from), Equals, true)
@@ -374,7 +374,7 @@ func (s *DiffTreeSuite) TestIssue279(c *C) {
 	// but should detect if the contents of the file also changed.
 	to = &treeNoder{
 		hash: plumbing.NewHash("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"),
-		mode: os.FileMode(0100644),
+		mode: filemode.Regular,
 	}
 	c.Assert(hashEqual(from, to), Equals, false)
 	c.Assert(hashEqual(to, from), Equals, false)
diff --git a/plumbing/object/file.go b/plumbing/object/file.go
index 4866777..5f24cf0 100644
--- a/plumbing/object/file.go
+++ b/plumbing/object/file.go
@@ -3,9 +3,9 @@ package object
 import (
 	"bytes"
 	"io"
-	"os"
 	"strings"
 
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/utils/ioutil"
 )
@@ -16,13 +16,13 @@ type File struct {
 	// depending of the function that generates it.
 	Name string
 	// Mode is the file mode.
-	Mode os.FileMode
+	Mode filemode.FileMode
 	// Blob with the contents of the file.
 	Blob
 }
 
 // NewFile returns a File based on the given blob object
-func NewFile(name string, m os.FileMode, b *Blob) *File {
+func NewFile(name string, m filemode.FileMode, b *Blob) *File {
 	return &File{Name: name, Mode: m, Blob: *b}
 }
 
@@ -81,7 +81,7 @@ func (iter *FileIter) Next() (*File, error) {
 			return nil, err
 		}
 
-		if entry.Mode.IsDir() || entry.Mode == SubmoduleMode {
+		if entry.Mode == filemode.Dir || entry.Mode == filemode.Submodule {
 			continue
 		}
 
diff --git a/plumbing/object/file_test.go b/plumbing/object/file_test.go
index c482541..573664b 100644
--- a/plumbing/object/file_test.go
+++ b/plumbing/object/file_test.go
@@ -3,11 +3,12 @@ package object
 import (
 	"io"
 
-	"github.com/src-d/go-git-fixtures"
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/storage/filesystem"
 
+	"github.com/src-d/go-git-fixtures"
 	. "gopkg.in/check.v1"
 )
 
@@ -58,7 +59,7 @@ func (s *FileSuite) TestIter(c *C) {
 			exp := t.files[k]
 			file, err := iter.Next()
 			c.Assert(err, IsNil, Commentf("subtest %d, iter %d, err=%v", i, k, err))
-			c.Assert(file.Mode.String(), Equals, "-rw-r--r--")
+			c.Assert(file.Mode, Equals, filemode.Regular)
 			c.Assert(file.Hash.IsZero(), Equals, false)
 			c.Assert(file.Hash, Equals, file.ID())
 			c.Assert(file.Name, Equals, exp.Name, Commentf("subtest %d, iter %d, name=%s, expected=%s", i, k, file.Name, exp.Hash))
diff --git a/plumbing/object/object_test.go b/plumbing/object/object_test.go
index 426baed..46b0065 100644
--- a/plumbing/object/object_test.go
+++ b/plumbing/object/object_test.go
@@ -6,11 +6,12 @@ import (
 	"testing"
 	"time"
 
-	"github.com/src-d/go-git-fixtures"
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/storage/filesystem"
 
+	"github.com/src-d/go-git-fixtures"
 	. "gopkg.in/check.v1"
 )
 
@@ -91,7 +92,7 @@ func (s *ObjectsSuite) TestParseTree(c *C) {
 	tree.buildMap()
 	c.Assert(tree.m, HasLen, 8)
 	c.Assert(tree.m[".gitignore"].Name, Equals, ".gitignore")
-	c.Assert(tree.m[".gitignore"].Mode.String(), Equals, "-rw-r--r--")
+	c.Assert(tree.m[".gitignore"].Mode, Equals, filemode.Regular)
 	c.Assert(tree.m[".gitignore"].Hash.String(), Equals, "32858aad3c383ed1ff0a0f9bdf231d54a00c9e88")
 
 	count := 0
diff --git a/plumbing/object/tree.go b/plumbing/object/tree.go
index ef5e140..071d064 100644
--- a/plumbing/object/tree.go
+++ b/plumbing/object/tree.go
@@ -5,12 +5,11 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 	"path"
-	"strconv"
 	"strings"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/utils/ioutil"
 )
@@ -18,13 +17,6 @@ import (
 const (
 	maxTreeDepth      = 1024
 	startingStackSize = 8
-
-	FileMode           os.FileMode = 0100644
-	FileModeDeprecated os.FileMode = 0100664
-	ExecutableMode     os.FileMode = 0100755
-	SubmoduleMode      os.FileMode = 0160000
-	SymlinkMode        os.FileMode = 0120000
-	TreeMode           os.FileMode = 0040000
 )
 
 // New errors defined by this package.
@@ -68,7 +60,7 @@ func DecodeTree(s storer.EncodedObjectStorer, o plumbing.EncodedObject) (*Tree,
 // TreeEntry represents a file
 type TreeEntry struct {
 	Name string
-	Mode os.FileMode
+	Mode filemode.FileMode
 	Hash plumbing.Hash
 }
 
@@ -202,7 +194,7 @@ func (t *Tree) Decode(o plumbing.EncodedObject) (err error) {
 
 	r := bufio.NewReader(reader)
 	for {
-		mode, err := r.ReadString(' ')
+		str, err := r.ReadString(' ')
 		if err != nil {
 			if err == io.EOF {
 				break
@@ -210,9 +202,10 @@ func (t *Tree) Decode(o plumbing.EncodedObject) (err error) {
 
 			return err
 		}
+		str = str[:len(str)-1] // strip last byte (' ')
 
-		fm, err := t.decodeFileMode(mode[:len(mode)-1])
-		if err != nil && err != io.EOF {
+		mode, err := filemode.New(str)
+		if err != nil {
 			return err
 		}
 
@@ -229,7 +222,7 @@ func (t *Tree) Decode(o plumbing.EncodedObject) (err error) {
 		baseName := name[:len(name)-1]
 		t.Entries = append(t.Entries, TreeEntry{
 			Hash: hash,
-			Mode: fm,
+			Mode: mode,
 			Name: baseName,
 		})
 	}
@@ -237,27 +230,6 @@ func (t *Tree) Decode(o plumbing.EncodedObject) (err error) {
 	return nil
 }
 
-func (t *Tree) decodeFileMode(mode string) (os.FileMode, error) {
-	fm, err := strconv.ParseInt(mode, 8, 32)
-	if err != nil && err != io.EOF {
-		return 0, err
-	}
-
-	m := os.FileMode(fm)
-	switch os.FileMode(fm) {
-	case FileMode:
-		m = 0644
-	case ExecutableMode:
-		m = 0755
-	case TreeMode:
-		m = m | os.ModeDir
-	case SymlinkMode:
-		m = m | os.ModeSymlink
-	}
-
-	return m, nil
-}
-
 // Encode transforms a Tree into a plumbing.EncodedObject.
 func (t *Tree) Encode(o plumbing.EncodedObject) error {
 	o.SetType(plumbing.TreeObject)
@@ -381,7 +353,7 @@ func (w *TreeWalker) Next() (name string, entry TreeEntry, err error) {
 			return
 		}
 
-		if entry.Mode.IsDir() {
+		if entry.Mode == filemode.Dir {
 			obj, err = GetTree(w.s, entry.Hash)
 		}
 
diff --git a/plumbing/object/tree_test.go b/plumbing/object/tree_test.go
index 81fbdec..69c0463 100644
--- a/plumbing/object/tree_test.go
+++ b/plumbing/object/tree_test.go
@@ -2,15 +2,14 @@ package object
 
 import (
 	"io"
-	"os"
-
-	fixtures "github.com/src-d/go-git-fixtures"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
+	"srcd.works/go-git.v4/plumbing/storer"
 	"srcd.works/go-git.v4/storage/filesystem"
 
+	fixtures "github.com/src-d/go-git-fixtures"
 	. "gopkg.in/check.v1"
-	"srcd.works/go-git.v4/plumbing/storer"
 )
 
 type TreeSuite struct {
@@ -31,10 +30,10 @@ func (s *TreeSuite) TestDecode(c *C) {
 	c.Assert(s.Tree.Entries, HasLen, 8)
 	c.Assert(s.Tree.Entries[0].Name, Equals, ".gitignore")
 	c.Assert(s.Tree.Entries[0].Hash.String(), Equals, "32858aad3c383ed1ff0a0f9bdf231d54a00c9e88")
-	c.Assert(s.Tree.Entries[0].Mode, Equals, os.FileMode(0644))
+	c.Assert(s.Tree.Entries[0].Mode, Equals, filemode.Regular)
 	c.Assert(s.Tree.Entries[4].Name, Equals, "go")
 	c.Assert(s.Tree.Entries[4].Hash.String(), Equals, "a39771a7651f97faf5c72e08224d857fc35133db")
-	c.Assert(s.Tree.Entries[4].Mode.String(), Equals, "d---------")
+	c.Assert(s.Tree.Entries[4].Mode, Equals, filemode.Dir)
 }
 
 func (s *TreeSuite) TestDecodeNonTree(c *C) {
@@ -164,9 +163,9 @@ func (s *TreeSuite) TestTreeDecodeEncodeIdempotent(c *C) {
 	trees := []*Tree{
 		{
 			Entries: []TreeEntry{
-				{"foo", os.FileMode(0), plumbing.NewHash("b029517f6300c2da0f4b651b8642506cd6aaf45d")},
-				{"bar", os.FileMode(0), plumbing.NewHash("c029517f6300c2da0f4b651b8642506cd6aaf45d")},
-				{"baz", os.FileMode(0), plumbing.NewHash("d029517f6300c2da0f4b651b8642506cd6aaf45d")},
+				{"foo", filemode.Empty, plumbing.NewHash("b029517f6300c2da0f4b651b8642506cd6aaf45d")},
+				{"bar", filemode.Empty, plumbing.NewHash("c029517f6300c2da0f4b651b8642506cd6aaf45d")},
+				{"baz", filemode.Empty, plumbing.NewHash("d029517f6300c2da0f4b651b8642506cd6aaf45d")},
 			},
 		},
 	}
@@ -233,7 +232,7 @@ func (s *TreeSuite) TestTreeWalkerNext(c *C) {
 		c.Assert(err, IsNil)
 		c.Assert(name, Equals, e.Path)
 		c.Assert(entry.Name, Equals, e.Name)
-		c.Assert(entry.Mode.String(), Equals, e.Mode)
+		c.Assert(entry.Mode, Equals, e.Mode)
 		c.Assert(entry.Hash.String(), Equals, e.Hash)
 
 		c.Assert(walker.Tree().ID().String(), Equals, e.Tree)
@@ -305,45 +304,47 @@ func (s *TreeSuite) TestTreeWalkerNextSubmodule(c *C) {
 }
 
 var treeWalkerExpects = []struct {
-	Path, Mode, Name, Hash, Tree string
+	Path             string
+	Mode             filemode.FileMode
+	Name, Hash, Tree string
 }{{
-	Path: ".gitignore", Mode: "-rw-r--r--", Name: ".gitignore",
+	Path: ".gitignore", Mode: filemode.Regular, Name: ".gitignore",
 	Hash: "32858aad3c383ed1ff0a0f9bdf231d54a00c9e88", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "CHANGELOG", Mode: "-rw-r--r--", Name: "CHANGELOG",
+	Path: "CHANGELOG", Mode: filemode.Regular, Name: "CHANGELOG",
 	Hash: "d3ff53e0564a9f87d8e84b6e28e5060e517008aa", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "LICENSE", Mode: "-rw-r--r--", Name: "LICENSE",
+	Path: "LICENSE", Mode: filemode.Regular, Name: "LICENSE",
 	Hash: "c192bd6a24ea1ab01d78686e417c8bdc7c3d197f", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "binary.jpg", Mode: "-rw-r--r--", Name: "binary.jpg",
+	Path: "binary.jpg", Mode: filemode.Regular, Name: "binary.jpg",
 	Hash: "d5c0f4ab811897cadf03aec358ae60d21f91c50d", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "go", Mode: "d---------", Name: "go",
+	Path: "go", Mode: filemode.Dir, Name: "go",
 	Hash: "a39771a7651f97faf5c72e08224d857fc35133db", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "go/example.go", Mode: "-rw-r--r--", Name: "example.go",
+	Path: "go/example.go", Mode: filemode.Regular, Name: "example.go",
 	Hash: "880cd14280f4b9b6ed3986d6671f907d7cc2a198", Tree: "a39771a7651f97faf5c72e08224d857fc35133db",
 }, {
-	Path: "json", Mode: "d---------", Name: "json",
+	Path: "json", Mode: filemode.Dir, Name: "json",
 	Hash: "5a877e6a906a2743ad6e45d99c1793642aaf8eda", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "json/long.json", Mode: "-rw-r--r--", Name: "long.json",
+	Path: "json/long.json", Mode: filemode.Regular, Name: "long.json",
 	Hash: "49c6bb89b17060d7b4deacb7b338fcc6ea2352a9", Tree: "5a877e6a906a2743ad6e45d99c1793642aaf8eda",
 }, {
-	Path: "json/short.json", Mode: "-rw-r--r--", Name: "short.json",
+	Path: "json/short.json", Mode: filemode.Regular, Name: "short.json",
 	Hash: "c8f1d8c61f9da76f4cb49fd86322b6e685dba956", Tree: "5a877e6a906a2743ad6e45d99c1793642aaf8eda",
 }, {
-	Path: "php", Mode: "d---------", Name: "php",
+	Path: "php", Mode: filemode.Dir, Name: "php",
 	Hash: "586af567d0bb5e771e49bdd9434f5e0fb76d25fa", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "php/crappy.php", Mode: "-rw-r--r--", Name: "crappy.php",
+	Path: "php/crappy.php", Mode: filemode.Regular, Name: "crappy.php",
 	Hash: "9a48f23120e880dfbe41f7c9b7b708e9ee62a492", Tree: "586af567d0bb5e771e49bdd9434f5e0fb76d25fa",
 }, {
-	Path: "vendor", Mode: "d---------", Name: "vendor",
+	Path: "vendor", Mode: filemode.Dir, Name: "vendor",
 	Hash: "cf4aa3b38974fb7d81f367c0830f7d78d65ab86b", Tree: "a8d315b2b1c615d43042c3a62402b8a54288cf5c",
 }, {
-	Path: "vendor/foo.go", Mode: "-rw-r--r--", Name: "foo.go",
+	Path: "vendor/foo.go", Mode: filemode.Regular, Name: "foo.go",
 	Hash: "9dea2395f5403188298c1dabe8bdafe562c491e3", Tree: "cf4aa3b38974fb7d81f367c0830f7d78d65ab86b",
 }}
 
@@ -925,567 +926,567 @@ func (s *TreeSuite) TestTreeDecodeReadBug(c *C) {
 	expected := &Tree{
 		Entries: []TreeEntry{
 			{
-				Name: "alter.c", Mode: 0644,
+				Name: "alter.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xa4, 0x9d, 0x33, 0x49, 0xd7, 0xe2, 0x3f, 0xb5, 0x81, 0x19, 0x4f, 0x4c, 0xb5, 0x9a, 0xc0, 0xd5, 0x1b, 0x2, 0x1f, 0x78},
 			},
 			{
-				Name: "analyze.c", Mode: 0644,
+				Name: "analyze.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x9a, 0x3e, 0x95, 0x97, 0xdb, 0xb, 0x3, 0x20, 0x77, 0xc9, 0x1d, 0x96, 0x9d, 0x22, 0xc6, 0x27, 0x3f, 0x70, 0x2a, 0xc},
 			},
 			{
-				Name: "attach.c", Mode: 0644,
+				Name: "attach.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb8, 0xe1, 0x21, 0x99, 0xb5, 0x7d, 0xe8, 0x11, 0xea, 0xe0, 0xd0, 0x61, 0x42, 0xd5, 0xac, 0x4f, 0xd4, 0x30, 0xb1, 0xd8},
 			},
 			{
-				Name: "auth.c", Mode: 0644,
+				Name: "auth.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd3, 0x8b, 0xb8, 0x36, 0xa7, 0x84, 0xfb, 0xfa, 0xb6, 0xab, 0x7b, 0x3, 0xd4, 0xe6, 0xdd, 0x43, 0xed, 0xc4, 0x1f, 0xa7},
 			},
 			{
-				Name: "backup.c", Mode: 0644,
+				Name: "backup.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x25, 0x2f, 0x61, 0xcf, 0xca, 0xa8, 0xfc, 0xf3, 0x13, 0x7e, 0x8, 0xed, 0x68, 0x47, 0xdc, 0xfe, 0x1d, 0xc1, 0xde, 0x54},
 			},
 			{
-				Name: "bitvec.c", Mode: 0644,
+				Name: "bitvec.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x52, 0x18, 0x4a, 0xa9, 0x64, 0xce, 0x18, 0x98, 0xf3, 0x5d, 0x1b, 0x3d, 0x87, 0x87, 0x1c, 0x2d, 0xe, 0xf4, 0xc5, 0x3d},
 			},
 			{
-				Name: "btmutex.c", Mode: 0644,
+				Name: "btmutex.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd8, 0x7d, 0x4d, 0x5f, 0xee, 0xb6, 0x30, 0x7a, 0xec, 0xdc, 0x9a, 0x83, 0x11, 0x14, 0x89, 0xab, 0x30, 0xc6, 0x78, 0xc3},
 			},
 			{
-				Name: "btree.c", Mode: 0644,
+				Name: "btree.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x3c, 0xa6, 0x5, 0x83, 0xe3, 0xc8, 0xe3, 0x12, 0x0, 0xf9, 0x73, 0xe0, 0xe9, 0xc4, 0x53, 0x62, 0x58, 0xb2, 0x64, 0x39},
 			},
 			{
-				Name: "btree.h", Mode: 0644,
+				Name: "btree.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xac, 0xe0, 0xf8, 0xcd, 0x21, 0x77, 0x70, 0xa2, 0xf6, 0x6b, 0x2e, 0xb8, 0x71, 0xbb, 0xc5, 0xfd, 0xc6, 0xfc, 0x2b, 0x68},
 			},
 			{
-				Name: "btreeInt.h", Mode: 0644,
+				Name: "btreeInt.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xce, 0x3c, 0x54, 0x93, 0xf8, 0xca, 0xd0, 0xbc, 0x54, 0x8a, 0xe8, 0xe4, 0x4e, 0x51, 0x28, 0x31, 0xd8, 0xfa, 0xc4, 0x31},
 			},
 			{
-				Name: "build.c", Mode: 0644,
+				Name: "build.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x3c, 0x91, 0xcd, 0xcf, 0xdb, 0x7b, 0x1, 0x7c, 0xbc, 0x2d, 0x5c, 0x29, 0x57, 0x1a, 0x98, 0x27, 0xd, 0xe0, 0x71, 0xe6},
 			},
 			{
-				Name: "callback.c", Mode: 0644,
+				Name: "callback.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd4, 0xc, 0x65, 0xcb, 0x92, 0x45, 0x80, 0x29, 0x6a, 0xd0, 0x69, 0xa0, 0x4b, 0xf9, 0xc9, 0xe9, 0x53, 0x4e, 0xca, 0xa7},
 			},
 			{
-				Name: "complete.c", Mode: 0644,
+				Name: "complete.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x9e, 0x91, 0x40, 0x8, 0x5c, 0x0, 0x46, 0xed, 0x3b, 0xf6, 0xf4, 0x48, 0x52, 0x20, 0x69, 0x2d, 0xca, 0x17, 0x43, 0xc5},
 			},
 			{
-				Name: "crypto.c", Mode: 0644,
+				Name: "crypto.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x25, 0x51, 0xe6, 0xba, 0x2, 0x39, 0xf8, 0x5a, 0x35, 0x77, 0x96, 0xa8, 0xdd, 0xa8, 0xca, 0x3e, 0x29, 0x70, 0x93, 0xf8},
 			},
 			{
-				Name: "crypto.h", Mode: 0644,
+				Name: "crypto.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf7, 0x1f, 0x53, 0x2c, 0xdc, 0x44, 0x8f, 0xa, 0x1d, 0xd5, 0xc6, 0xef, 0xf5, 0xfb, 0xd3, 0x3a, 0x91, 0x55, 0xaa, 0x97},
 			},
 			{
-				Name: "crypto_cc.c", Mode: 0644,
+				Name: "crypto_cc.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x53, 0x7d, 0xf7, 0xe3, 0xb3, 0x6a, 0xb5, 0xcf, 0xdd, 0x6f, 0xca, 0x40, 0x28, 0xeb, 0xca, 0xe1, 0x86, 0x87, 0xd6, 0x4d},
 			},
 			{
-				Name: "crypto_impl.c", Mode: 0644,
+				Name: "crypto_impl.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xa5, 0x89, 0x27, 0xc7, 0x6e, 0xf6, 0x20, 0x56, 0x77, 0xbe, 0x5c, 0x1a, 0x8e, 0x80, 0xc9, 0x83, 0x56, 0xb3, 0xa9, 0xd3},
 			},
 			{
-				Name: "crypto_libtomcrypt.c", Mode: 0644,
+				Name: "crypto_libtomcrypt.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x1a, 0x33, 0x83, 0xe0, 0x1, 0xa7, 0x21, 0x11, 0xc3, 0xf6, 0x61, 0x92, 0x22, 0xb0, 0x65, 0xf4, 0xbd, 0x1, 0xb, 0xe1},
 			},
 			{
-				Name: "crypto_openssl.c", Mode: 0644,
+				Name: "crypto_openssl.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd0, 0x19, 0x81, 0x3b, 0x47, 0x6c, 0x52, 0xd0, 0x20, 0xe2, 0xc0, 0xac, 0xd5, 0x24, 0xe9, 0xea, 0x3d, 0xf, 0xb9, 0xfe},
 			},
 			{
-				Name: "ctime.c", Mode: 0644,
+				Name: "ctime.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x60, 0x59, 0x5f, 0xf8, 0x8d, 0x92, 0xf7, 0x8, 0x26, 0x4, 0xfb, 0xd9, 0xdf, 0x9a, 0xfe, 0xa1, 0x6a, 0xe8, 0x6f, 0xf},
 			},
 			{
-				Name: "date.c", Mode: 0644,
+				Name: "date.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x75, 0x8d, 0xd7, 0xc8, 0x9b, 0xca, 0x39, 0x37, 0xa9, 0xd, 0x70, 0x6e, 0xa9, 0x82, 0xce, 0x3a, 0xcf, 0x11, 0xd1, 0x83},
 			},
 			{
-				Name: "delete.c", Mode: 0644,
+				Name: "delete.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x63, 0x4e, 0x11, 0x55, 0x63, 0xae, 0x12, 0xba, 0x65, 0x58, 0xcc, 0xc5, 0x12, 0xae, 0xd6, 0x31, 0xc0, 0x66, 0xba, 0xd8},
 			},
 			{
-				Name: "expr.c", Mode: 0644,
+				Name: "expr.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x66, 0x3, 0x97, 0xe0, 0x78, 0xae, 0x48, 0xb2, 0xe7, 0x17, 0x5e, 0x33, 0x85, 0x67, 0x78, 0x19, 0x72, 0x2d, 0xdd, 0x6c},
 			},
 			{
-				Name: "fault.c", Mode: 0644,
+				Name: "fault.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xc3, 0x2, 0x8c, 0x4f, 0x93, 0x6e, 0xdf, 0x96, 0x71, 0x2d, 0xbe, 0x73, 0xa0, 0x76, 0x62, 0xf0, 0xa2, 0x6b, 0x1d, 0xa},
 			},
 			{
-				Name: "fkey.c", Mode: 0644,
+				Name: "fkey.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xac, 0x35, 0xbc, 0x19, 0x4c, 0xde, 0xb1, 0x27, 0x98, 0x9b, 0x9, 0x40, 0x35, 0xce, 0xe0, 0x6f, 0x57, 0x37, 0x6f, 0x5e},
 			},
 			{
-				Name: "func.c", Mode: 0644,
+				Name: "func.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xc0, 0x2f, 0x9, 0x6a, 0xda, 0xd5, 0xbc, 0xe9, 0xac, 0x83, 0xd3, 0x5f, 0xf, 0x46, 0x9, 0xd6, 0xf6, 0xd4, 0x3b, 0xe5},
 			},
 			{
-				Name: "global.c", Mode: 0644,
+				Name: "global.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x7b, 0x2, 0xcf, 0x21, 0x30, 0xe0, 0xd1, 0xa7, 0xb8, 0x89, 0xd8, 0x44, 0xc, 0xcc, 0x82, 0x8, 0xf7, 0xb6, 0x7b, 0xf9},
 			},
 			{
-				Name: "hash.c", Mode: 0644,
+				Name: "hash.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe8, 0x1d, 0xcf, 0x95, 0xe4, 0x38, 0x48, 0xfa, 0x70, 0x86, 0xb7, 0xf7, 0x81, 0xc0, 0x90, 0xad, 0xc7, 0xe6, 0xca, 0x8e},
 			},
 			{
-				Name: "hash.h", Mode: 0644,
+				Name: "hash.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x82, 0xb7, 0xc5, 0x8c, 0x71, 0x9, 0xb, 0x54, 0x7e, 0x10, 0x17, 0x42, 0xaa, 0x9, 0x51, 0x73, 0x9f, 0xf2, 0xee, 0xe7},
 			},
 			{
-				Name: "hwtime.h", Mode: 0644,
+				Name: "hwtime.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb8, 0xbc, 0x5a, 0x29, 0x5b, 0xe3, 0xfa, 0xc8, 0x35, 0x1f, 0xa9, 0xf0, 0x8a, 0x77, 0x57, 0x9d, 0x59, 0xc9, 0xa8, 0xe4},
 			},
 			{
-				Name: "insert.c", Mode: 0644,
+				Name: "insert.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x9a, 0x56, 0x61, 0xf5, 0x9a, 0x72, 0x95, 0x2b, 0xe6, 0xc1, 0x67, 0xa0, 0xc2, 0xdb, 0x15, 0x9b, 0x91, 0xb7, 0x1f, 0xae},
 			},
 			{
-				Name: "journal.c", Mode: 0644,
+				Name: "journal.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xfe, 0xd2, 0x7b, 0xe3, 0xe3, 0x80, 0x55, 0xd2, 0x20, 0x43, 0x95, 0xcd, 0xe6, 0xff, 0xc9, 0x45, 0x89, 0xfb, 0xf5, 0xe8},
 			},
 			{
-				Name: "legacy.c", Mode: 0644,
+				Name: "legacy.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x94, 0x64, 0x9a, 0xe7, 0x5, 0xab, 0x93, 0x85, 0x10, 0x8d, 0xd, 0x88, 0x7a, 0xf0, 0x75, 0x92, 0x89, 0xfb, 0x23, 0xcb},
 			},
 			{
-				Name: "lempar.c", Mode: 0644,
+				Name: "lempar.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x2a, 0xfa, 0xa6, 0xce, 0xa6, 0xd8, 0x29, 0x60, 0x2c, 0x27, 0x86, 0xc1, 0xf8, 0xa3, 0x7f, 0x56, 0x7c, 0xf6, 0xfd, 0x53},
 			},
 			{
-				Name: "loadext.c", Mode: 0644,
+				Name: "loadext.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xcd, 0xcf, 0x6a, 0x93, 0xb8, 0xc4, 0xf, 0x91, 0x4b, 0x94, 0x24, 0xe, 0xf1, 0x4c, 0xb4, 0xa3, 0xa, 0x37, 0xec, 0xa1},
 			},
 			{
-				Name: "main.c", Mode: 0644,
+				Name: "main.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x39, 0xf6, 0x4, 0x21, 0xe6, 0x81, 0x27, 0x7c, 0xc3, 0xdb, 0xa0, 0x9a, 0xbe, 0x7c, 0xf7, 0x90, 0xd5, 0x28, 0xf5, 0xc3},
 			},
 			{
-				Name: "malloc.c", Mode: 0644,
+				Name: "malloc.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x35, 0xa4, 0x4e, 0x5f, 0x61, 0xc2, 0xe4, 0x4c, 0x48, 0x1c, 0x62, 0x51, 0xbd, 0xa, 0xae, 0x7a, 0xcd, 0xa4, 0xde, 0xb},
 			},
 			{
-				Name: "mem0.c", Mode: 0644,
+				Name: "mem0.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd, 0xb, 0x66, 0x67, 0xd6, 0xa, 0x95, 0x5a, 0x6, 0x96, 0xdf, 0x62, 0x89, 0xb4, 0x91, 0x78, 0x96, 0x93, 0x43, 0xaa},
 			},
 			{
-				Name: "mem1.c", Mode: 0644,
+				Name: "mem1.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x35, 0x78, 0x49, 0x6f, 0x33, 0x3, 0x7, 0xb2, 0x31, 0xdf, 0xb5, 0x3c, 0xc, 0x2e, 0x1c, 0x6b, 0x32, 0x3d, 0x79, 0x1e},
 			},
 			{
-				Name: "mem2.c", Mode: 0644,
+				Name: "mem2.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x26, 0x44, 0x8e, 0xa8, 0xaa, 0xe0, 0x36, 0x6a, 0xf0, 0x54, 0x1a, 0xfe, 0xa4, 0x79, 0xb, 0x42, 0xf4, 0xa6, 0x9b, 0x5a},
 			},
 			{
-				Name: "mem3.c", Mode: 0644,
+				Name: "mem3.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x1a, 0x1b, 0x79, 0x1f, 0x28, 0xf8, 0xcf, 0x3c, 0xe4, 0xf9, 0xa3, 0x5c, 0xda, 0xd7, 0xb7, 0x10, 0x75, 0x68, 0xc7, 0x15},
 			},
 			{
-				Name: "mem5.c", Mode: 0644,
+				Name: "mem5.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x78, 0x3c, 0xef, 0x61, 0x76, 0xc5, 0x9c, 0xbf, 0x30, 0x91, 0x46, 0x31, 0x9, 0x5a, 0x1a, 0x54, 0xf4, 0xe4, 0x2e, 0x8},
 			},
 			{
-				Name: "memjournal.c", Mode: 0644,
+				Name: "memjournal.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x5, 0x72, 0x59, 0x48, 0xf6, 0x5d, 0x42, 0x7b, 0x7, 0xf7, 0xf9, 0x29, 0xac, 0xa3, 0xff, 0x22, 0x4b, 0x17, 0x53, 0xdf},
 			},
 			{
-				Name: "mutex.c", Mode: 0644,
+				Name: "mutex.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb5, 0x67, 0xe7, 0xc2, 0x7e, 0xf2, 0x4, 0x10, 0x86, 0xaf, 0xe0, 0xf6, 0x96, 0x66, 0xe2, 0x7b, 0xf5, 0x9, 0x8a, 0x59},
 			},
 			{
-				Name: "mutex.h", Mode: 0644,
+				Name: "mutex.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x9, 0x78, 0x81, 0x22, 0x52, 0x77, 0x89, 0xa, 0x9c, 0x36, 0xc2, 0x4d, 0x41, 0xf6, 0x11, 0x4d, 0x64, 0xc0, 0x6d, 0xb3},
 			},
 			{
-				Name: "mutex_noop.c", Mode: 0644,
+				Name: "mutex_noop.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x45, 0x6e, 0x82, 0xa2, 0x5e, 0x27, 0x1b, 0x6, 0x14, 0xe7, 0xf4, 0xf8, 0x3c, 0x22, 0x85, 0x53, 0xb7, 0xfa, 0x1, 0x58},
 			},
 			{
-				Name: "mutex_unix.c", Mode: 0644,
+				Name: "mutex_unix.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xec, 0xa7, 0x29, 0x58, 0x31, 0xc2, 0xf0, 0xee, 0x48, 0xba, 0x54, 0xd0, 0x62, 0x91, 0x4d, 0x6, 0xa1, 0xdd, 0x8e, 0xbe},
 			},
 			{
-				Name: "mutex_w32.c", Mode: 0644,
+				Name: "mutex_w32.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x27, 0xd1, 0xa, 0xf5, 0xbd, 0x33, 0x1b, 0xdb, 0x97, 0x3f, 0x61, 0x45, 0xb7, 0x4f, 0x72, 0xb6, 0x7, 0xcf, 0xc4, 0x6e},
 			},
 			{
-				Name: "notify.c", Mode: 0644,
+				Name: "notify.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xfc, 0xab, 0x5b, 0xfa, 0xf0, 0x19, 0x8, 0xd3, 0xde, 0x93, 0xfa, 0x88, 0xb5, 0xea, 0xe9, 0xe9, 0x6c, 0xa3, 0xc8, 0xe8},
 			},
 			{
-				Name: "os.c", Mode: 0644,
+				Name: "os.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xbe, 0x2e, 0xa4, 0xcf, 0xc0, 0x19, 0x59, 0x93, 0xa3, 0x40, 0xc9, 0x2, 0xae, 0xdd, 0xf1, 0xbe, 0x4b, 0x8e, 0xd7, 0x3a},
 			},
 			{
-				Name: "os.h", Mode: 0644,
+				Name: "os.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x7, 0xa, 0x2d, 0xdd, 0x17, 0xf7, 0x71, 0xf9, 0x8f, 0xf8, 0xcc, 0xd6, 0xf0, 0x33, 0xbd, 0xac, 0xc5, 0xe9, 0xf6, 0xc},
 			},
 			{
-				Name: "os_common.h", Mode: 0644,
+				Name: "os_common.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf6, 0xc3, 0xe7, 0xff, 0x89, 0x46, 0x30, 0x86, 0x40, 0x18, 0x22, 0xf4, 0x81, 0xe7, 0xe3, 0xb8, 0x7b, 0x2c, 0x78, 0xc7},
 			},
 			{
-				Name: "os_unix.c", Mode: 0644,
+				Name: "os_unix.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xab, 0xc2, 0x3a, 0x45, 0x2e, 0x72, 0xf7, 0x1c, 0x76, 0xaf, 0xa9, 0x98, 0x3c, 0x3a, 0xd9, 0xd4, 0x25, 0x61, 0x6c, 0x6d},
 			},
 			{
-				Name: "os_win.c", Mode: 0644,
+				Name: "os_win.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xae, 0xb0, 0x88, 0x14, 0xb3, 0xda, 0xbe, 0x81, 0xb8, 0x4c, 0xda, 0x91, 0x85, 0x82, 0xb0, 0xf, 0xfd, 0x86, 0xe4, 0x87},
 			},
 			{
-				Name: "pager.c", Mode: 0644,
+				Name: "pager.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x61, 0x72, 0x7f, 0xaa, 0x9c, 0xf, 0x3d, 0x56, 0x62, 0x65, 0xbe, 0x7e, 0xec, 0x5b, 0x2a, 0x35, 0xf6, 0xa4, 0xbc, 0x9f},
 			},
 			{
-				Name: "pager.h", Mode: 0644,
+				Name: "pager.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x6f, 0x65, 0x91, 0x36, 0xe2, 0x76, 0x7, 0x9d, 0xa4, 0x3a, 0x2e, 0x39, 0xe1, 0xb6, 0x86, 0x37, 0xec, 0xad, 0xcf, 0x68},
 			},
 			{
-				Name: "parse.y", Mode: 0644,
+				Name: "parse.y", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x83, 0x10, 0xb2, 0x69, 0x89, 0xb0, 0x5b, 0xed, 0x1e, 0x1b, 0x3, 0xda, 0x80, 0xf5, 0xc0, 0xa5, 0x2e, 0x9a, 0xd1, 0xd2},
 			},
 			{
-				Name: "pcache.c", Mode: 0644,
+				Name: "pcache.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x48, 0x2a, 0x18, 0x8b, 0xee, 0x19, 0x91, 0xbc, 0x8a, 0xda, 0xc9, 0x6a, 0x19, 0x3a, 0x53, 0xe5, 0x46, 0x2a, 0x8c, 0x10},
 			},
 			{
-				Name: "pcache.h", Mode: 0644,
+				Name: "pcache.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf4, 0xd4, 0xad, 0x71, 0xc1, 0xd, 0x78, 0xc6, 0xda, 0xbd, 0xe2, 0x52, 0x15, 0xcd, 0x41, 0x5a, 0x76, 0x1, 0x48, 0xca},
 			},
 			{
-				Name: "pcache1.c", Mode: 0644,
+				Name: "pcache1.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x41, 0x47, 0xd2, 0xef, 0xf5, 0x5b, 0xdd, 0x9f, 0xf7, 0xc6, 0x86, 0xc, 0x60, 0x18, 0x10, 0x20, 0x16, 0x6c, 0x5f, 0x50},
 			},
 			{
-				Name: "pragma.c", Mode: 0644,
+				Name: "pragma.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x22, 0x97, 0x71, 0x69, 0x61, 0x7d, 0x49, 0x22, 0xb3, 0x99, 0x3f, 0x76, 0x9d, 0x90, 0xfa, 0x7b, 0xc4, 0x41, 0xea, 0x50},
 			},
 			{
-				Name: "prepare.c", Mode: 0644,
+				Name: "prepare.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd7, 0x8d, 0x83, 0xcb, 0xd8, 0x78, 0x97, 0xf5, 0x73, 0x30, 0x3f, 0x9f, 0x57, 0xab, 0x8d, 0xe0, 0x24, 0xa6, 0xe3, 0xf8},
 			},
 			{
-				Name: "printf.c", Mode: 0644,
+				Name: "printf.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x9f, 0x68, 0xd2, 0x4, 0xff, 0xdc, 0x9f, 0x3d, 0x42, 0x7f, 0x80, 0xa8, 0x23, 0x9a, 0x7f, 0xa3, 0xa9, 0x8a, 0xec, 0xbd},
 			},
 			{
-				Name: "random.c", Mode: 0644,
+				Name: "random.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x23, 0x4e, 0xbd, 0xf6, 0x58, 0xf4, 0x36, 0xcc, 0x7c, 0x68, 0xf0, 0x27, 0xc4, 0x8b, 0xe, 0x1b, 0x9b, 0xa3, 0x4e, 0x98},
 			},
 			{
-				Name: "resolve.c", Mode: 0644,
+				Name: "resolve.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x91, 0xef, 0xca, 0xa1, 0xa1, 0x6b, 0xfc, 0x98, 0xfb, 0x35, 0xd8, 0x5c, 0xad, 0x15, 0x6b, 0x93, 0x53, 0x3e, 0x4e, 0x6},
 			},
 			{
-				Name: "rowset.c", Mode: 0644,
+				Name: "rowset.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x57, 0x61, 0xf9, 0x85, 0x50, 0xb1, 0x76, 0xcc, 0xe1, 0x1d, 0xcb, 0xce, 0xc9, 0x38, 0x99, 0xa0, 0x75, 0xbb, 0x64, 0xfd},
 			},
 			{
-				Name: "select.c", Mode: 0644,
+				Name: "select.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf3, 0xf1, 0x49, 0x9, 0x63, 0x95, 0x5b, 0x8e, 0xd0, 0xc9, 0xfe, 0x6e, 0x1e, 0xec, 0x83, 0x6c, 0x1a, 0x52, 0x94, 0xb4},
 			},
 			{
-				Name: "shell.c", Mode: 0644,
+				Name: "shell.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x1b, 0xe2, 0x87, 0x1f, 0xed, 0x9a, 0x1f, 0xdf, 0x1d, 0xf7, 0x19, 0x8e, 0x11, 0x25, 0x36, 0x0, 0xec, 0xba, 0x76, 0xcc},
 			},
 			{
-				Name: "sqlcipher.h", Mode: 0644,
+				Name: "sqlcipher.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x82, 0x75, 0x30, 0x95, 0xcd, 0x17, 0x23, 0xc5, 0xff, 0x4f, 0x11, 0x15, 0xe4, 0x97, 0x55, 0x91, 0xee, 0x34, 0xf5, 0xce},
 			},
 			{
-				Name: "sqlite.h.in", Mode: 0644,
+				Name: "sqlite.h.in", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x66, 0x8, 0x82, 0x31, 0x75, 0xde, 0x5b, 0x6a, 0xd, 0x37, 0x8f, 0xdb, 0xc, 0x38, 0x18, 0xb6, 0xab, 0x4f, 0xbf, 0x8e},
 			},
 			{
-				Name: "sqlite3.rc", Mode: 0644,
+				Name: "sqlite3.rc", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x96, 0x98, 0x76, 0xda, 0x1e, 0x57, 0x14, 0x3d, 0xe0, 0xb4, 0xd1, 0xc7, 0x62, 0x9f, 0xd3, 0x35, 0x6f, 0x2e, 0x1c, 0x96},
 			},
 			{
-				Name: "sqlite3ext.h", Mode: 0644,
+				Name: "sqlite3ext.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x92, 0x8b, 0xb3, 0xba, 0xd9, 0xdd, 0x64, 0x3c, 0x30, 0x1d, 0xd2, 0xb0, 0xac, 0x22, 0x28, 0x7a, 0x81, 0x28, 0x48, 0x84},
 			},
 			{
-				Name: "sqliteInt.h", Mode: 0644,
+				Name: "sqliteInt.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x59, 0x50, 0xf2, 0x37, 0xd9, 0xf9, 0xf2, 0xd3, 0xef, 0x6b, 0xd8, 0xbe, 0x34, 0x2d, 0xcf, 0x64, 0x89, 0x22, 0x51, 0x42},
 			},
 			{
-				Name: "sqliteLimit.h", Mode: 0644,
+				Name: "sqliteLimit.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xc7, 0xae, 0xe5, 0x3c, 0xeb, 0xca, 0x94, 0xda, 0x51, 0xe7, 0x1a, 0x82, 0x2e, 0xa5, 0xa6, 0xde, 0xb9, 0x3, 0x85, 0xdf},
 			},
 			{
-				Name: "status.c", Mode: 0644,
+				Name: "status.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x28, 0x34, 0x9e, 0x6d, 0x3d, 0x20, 0x88, 0xe0, 0x0, 0x3b, 0x76, 0xf8, 0xa, 0x89, 0x54, 0xfa, 0xec, 0x59, 0x30, 0xba},
 			},
 			{
-				Name: "table.c", Mode: 0644,
+				Name: "table.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x26, 0xbb, 0xfb, 0x4f, 0x45, 0x6c, 0x42, 0x98, 0x25, 0x29, 0xea, 0x1a, 0x63, 0xa0, 0x17, 0x51, 0xdd, 0x3e, 0xe9, 0x5a},
 			},
 			{
-				Name: "tclsqlite.c", Mode: 0644,
+				Name: "tclsqlite.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf1, 0xbb, 0x29, 0x21, 0xda, 0xc, 0x68, 0xa4, 0xf1, 0xc8, 0xe1, 0x5c, 0xf5, 0x66, 0xb2, 0x33, 0xe9, 0x2a, 0x51, 0x9f},
 			},
 			{
-				Name: "test1.c", Mode: 0644,
+				Name: "test1.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xa6, 0x38, 0xe4, 0x80, 0xad, 0xdf, 0x14, 0x43, 0x9c, 0xdf, 0xa4, 0xee, 0x16, 0x4d, 0xc3, 0x1b, 0x79, 0xf8, 0xbc, 0xac},
 			},
 			{
-				Name: "test2.c", Mode: 0644,
+				Name: "test2.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd1, 0x30, 0xe9, 0xd0, 0x1b, 0x70, 0x24, 0xa5, 0xec, 0x6d, 0x73, 0x5, 0x92, 0xee, 0x4d, 0x1f, 0xb0, 0x2c, 0xfd, 0xb4},
 			},
 			{
-				Name: "test3.c", Mode: 0644,
+				Name: "test3.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe3, 0xed, 0x31, 0xc, 0x81, 0x4, 0xfe, 0x36, 0x21, 0xce, 0xbb, 0xf, 0x51, 0xd1, 0x1, 0x45, 0x1, 0x8d, 0x4f, 0xac},
 			},
 			{
-				Name: "test4.c", Mode: 0644,
+				Name: "test4.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xa6, 0x37, 0x5c, 0x7c, 0xc4, 0x3, 0xf6, 0xc, 0xaa, 0xb7, 0xe9, 0x59, 0x53, 0x3e, 0x3d, 0xb1, 0xff, 0x75, 0xa, 0xe4},
 			},
 			{
-				Name: "test5.c", Mode: 0644,
+				Name: "test5.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x30, 0x3d, 0x12, 0x5, 0xb2, 0x26, 0x28, 0x42, 0x3d, 0x98, 0x6f, 0x71, 0xe2, 0x7c, 0x7c, 0xf7, 0x14, 0xa7, 0x45, 0xa6},
 			},
 			{
-				Name: "test6.c", Mode: 0644,
+				Name: "test6.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xc1, 0x51, 0xea, 0x42, 0x98, 0x9b, 0xb, 0xe2, 0x4e, 0xe4, 0xb9, 0xa4, 0xbe, 0x37, 0x8b, 0x4f, 0x63, 0x6d, 0xb6, 0x41},
 			},
 			{
-				Name: "test7.c", Mode: 0644,
+				Name: "test7.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x3c, 0xd4, 0xa2, 0x24, 0xd7, 0xe8, 0xe1, 0x6b, 0xd7, 0xcb, 0xe4, 0x9e, 0x2d, 0x3e, 0x94, 0xce, 0x9b, 0x17, 0xbd, 0x76},
 			},
 			{
-				Name: "test8.c", Mode: 0644,
+				Name: "test8.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xc5, 0x73, 0x93, 0x32, 0xd4, 0x6e, 0x57, 0x12, 0x1d, 0xa2, 0x7c, 0x3e, 0x88, 0xfd, 0xe7, 0x5a, 0xeb, 0x87, 0x10, 0xf7},
 			},
 			{
-				Name: "test9.c", Mode: 0644,
+				Name: "test9.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe5, 0x99, 0x3e, 0x8f, 0xf7, 0x8f, 0x61, 0xc2, 0x43, 0x5b, 0x6f, 0x97, 0xa3, 0xb4, 0x63, 0xe2, 0x27, 0xc7, 0x67, 0xac},
 			},
 			{
-				Name: "test_async.c", Mode: 0644,
+				Name: "test_async.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb0, 0xb9, 0x43, 0x18, 0x5b, 0xfc, 0x23, 0xc1, 0x7f, 0xd0, 0x8f, 0x55, 0x76, 0x8c, 0xac, 0x12, 0xa9, 0xf5, 0x69, 0x51},
 			},
 			{
-				Name: "test_autoext.c", Mode: 0644,
+				Name: "test_autoext.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb5, 0x1, 0x3f, 0x31, 0x73, 0xa2, 0x17, 0x6e, 0x2d, 0x9f, 0xc, 0xaa, 0x99, 0x19, 0x30, 0x36, 0xbf, 0xc3, 0x7e, 0x91},
 			},
 			{
-				Name: "test_backup.c", Mode: 0644,
+				Name: "test_backup.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe9, 0x67, 0x42, 0x4a, 0x29, 0xf, 0x73, 0x8a, 0xec, 0xfd, 0xac, 0x57, 0x8e, 0x9b, 0x87, 0xa4, 0xc4, 0xae, 0x8d, 0x7f},
 			},
 			{
-				Name: "test_btree.c", Mode: 0644,
+				Name: "test_btree.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xdb, 0x72, 0x88, 0x9b, 0x2a, 0xfb, 0x62, 0x72, 0x82, 0x8d, 0xda, 0x86, 0x6d, 0xcc, 0xf1, 0x22, 0xa4, 0x9a, 0x72, 0x99},
 			},
 			{
-				Name: "test_config.c", Mode: 0644,
+				Name: "test_config.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x53, 0x47, 0x27, 0xa0, 0x80, 0x42, 0xb6, 0xca, 0xd6, 0x7e, 0x26, 0x7e, 0x87, 0xb4, 0x3, 0xa4, 0x1a, 0x73, 0xb2, 0x99},
 			},
 			{
-				Name: "test_demovfs.c", Mode: 0644,
+				Name: "test_demovfs.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x63, 0x76, 0x27, 0x7, 0x1d, 0x9e, 0x28, 0xf4, 0xb3, 0x45, 0x1b, 0xbb, 0xdd, 0xf8, 0x8, 0xd1, 0xa9, 0x12, 0x0, 0xf8},
 			},
 			{
-				Name: "test_devsym.c", Mode: 0644,
+				Name: "test_devsym.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x21, 0xf0, 0xf6, 0x84, 0xd8, 0x61, 0x11, 0x67, 0x70, 0xde, 0xfc, 0xde, 0xcd, 0x53, 0x2b, 0xa3, 0xee, 0xab, 0xa9, 0x75},
 			},
 			{
-				Name: "test_fs.c", Mode: 0644,
+				Name: "test_fs.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x47, 0x8c, 0xad, 0x80, 0xb1, 0x6a, 0x90, 0x9b, 0x23, 0xbd, 0x3, 0xc2, 0xda, 0xd8, 0xb4, 0x49, 0xa7, 0x45, 0x87, 0xa1},
 			},
 			{
-				Name: "test_func.c", Mode: 0644,
+				Name: "test_func.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x6f, 0x9b, 0xb0, 0x3d, 0xc8, 0x8a, 0x21, 0xd6, 0x58, 0xbf, 0x99, 0x99, 0xba, 0xf6, 0x6d, 0xc1, 0xd5, 0x2e, 0xbc, 0x54},
 			},
 			{
-				Name: "test_hexio.c", Mode: 0644,
+				Name: "test_hexio.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb2, 0xb, 0x5c, 0xe7, 0x30, 0xab, 0x7f, 0xa8, 0x0, 0xd2, 0xd0, 0xcc, 0x38, 0xc7, 0x72, 0x75, 0x59, 0x3e, 0xbd, 0xbb},
 			},
 			{
-				Name: "test_init.c", Mode: 0644,
+				Name: "test_init.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe3, 0x72, 0x4d, 0x8b, 0xe3, 0x14, 0xdb, 0x9, 0xee, 0xa8, 0x4, 0xb, 0x9d, 0xdf, 0xc8, 0xa8, 0xbe, 0xee, 0x22, 0x91},
 			},
 			{
-				Name: "test_intarray.c", Mode: 0644,
+				Name: "test_intarray.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf5, 0xc3, 0xd9, 0xe4, 0x5, 0x9a, 0x16, 0x56, 0x7, 0x34, 0x7, 0xe4, 0x3a, 0x92, 0x11, 0x79, 0x99, 0x69, 0x7b, 0x93},
 			},
 			{
-				Name: "test_intarray.h", Mode: 0644,
+				Name: "test_intarray.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x69, 0x13, 0x37, 0xd1, 0xae, 0xd6, 0x37, 0x15, 0xd6, 0x2e, 0x76, 0x26, 0x6f, 0xf, 0x3b, 0x50, 0x8b, 0x1, 0xa, 0x34},
 			},
 			{
-				Name: "test_journal.c", Mode: 0644,
+				Name: "test_journal.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe8, 0x70, 0x1a, 0x4e, 0xea, 0xdb, 0x8e, 0xad, 0x16, 0x9d, 0x60, 0x6, 0x40, 0x7d, 0x54, 0xa8, 0x98, 0x59, 0x2d, 0x70},
 			},
 			{
-				Name: "test_loadext.c", Mode: 0644,
+				Name: "test_loadext.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x11, 0x37, 0xe3, 0xa9, 0xaa, 0xe9, 0x29, 0x6, 0xb8, 0x28, 0x9f, 0x6c, 0x3d, 0xaa, 0x61, 0xf0, 0xd0, 0x70, 0xf5, 0x5a},
 			},
 			{
-				Name: "test_malloc.c", Mode: 0644,
+				Name: "test_malloc.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xcf, 0x98, 0xa8, 0xfb, 0x21, 0x82, 0xc0, 0xba, 0xf5, 0xa, 0xd5, 0x79, 0x79, 0xb6, 0x75, 0xbb, 0x70, 0x7a, 0x93, 0xb0},
 			},
 			{
-				Name: "test_multiplex.c", Mode: 0644,
+				Name: "test_multiplex.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x62, 0x45, 0x41, 0xb3, 0x2a, 0x10, 0xd2, 0x1a, 0x2f, 0xd1, 0xa, 0x35, 0xee, 0x66, 0x32, 0xbd, 0xac, 0x55, 0x2d, 0x41},
 			},
 			{
-				Name: "test_multiplex.h", Mode: 0644,
+				Name: "test_multiplex.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xb7, 0xe1, 0xaf, 0xea, 0x5f, 0xd7, 0x8b, 0x87, 0x58, 0x2, 0x65, 0xf8, 0x4c, 0x81, 0x61, 0x2c, 0xbd, 0x2, 0x5b, 0xaf},
 			},
 			{
-				Name: "test_mutex.c", Mode: 0644,
+				Name: "test_mutex.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xc9, 0xb4, 0xa2, 0x9a, 0xb7, 0x5c, 0x77, 0xea, 0x5f, 0x36, 0xb5, 0x19, 0x32, 0x56, 0xd7, 0xf, 0xe6, 0x58, 0xe, 0x95},
 			},
 			{
-				Name: "test_onefile.c", Mode: 0644,
+				Name: "test_onefile.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x69, 0x86, 0x74, 0x41, 0xb8, 0xcc, 0x9a, 0x62, 0x1a, 0xf3, 0x24, 0x13, 0xfc, 0x63, 0xda, 0x80, 0x99, 0x37, 0x64, 0xf4},
 			},
 			{
-				Name: "test_osinst.c", Mode: 0644,
+				Name: "test_osinst.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x53, 0x14, 0x33, 0x31, 0x3e, 0xe3, 0x6c, 0x7, 0xeb, 0x21, 0xc0, 0x2f, 0x31, 0x15, 0xcb, 0x7a, 0x37, 0x48, 0x6c, 0x79},
 			},
 			{
-				Name: "test_pcache.c", Mode: 0644,
+				Name: "test_pcache.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x8f, 0xcf, 0xe7, 0xe2, 0x6e, 0x3f, 0xf1, 0x74, 0x96, 0xb8, 0x40, 0xf5, 0xd6, 0x3c, 0x75, 0x78, 0x3a, 0xff, 0x81, 0x62},
 			},
-			{Name: "test_quota.c", Mode: 0644, Hash: plumbing.Hash{
-				0xe5, 0x90, 0x99, 0x6c, 0xa4, 0xb8, 0x57, 0x4a, 0xb1, 0xe4, 0x18, 0x5d, 0x57, 0x77, 0x56, 0x66, 0x4a, 0xd2, 0x49, 0x5f}}, {Name: "test_quota.h", Mode: 0644,
+			{Name: "test_quota.c", Mode: filemode.Regular, Hash: plumbing.Hash{
+				0xe5, 0x90, 0x99, 0x6c, 0xa4, 0xb8, 0x57, 0x4a, 0xb1, 0xe4, 0x18, 0x5d, 0x57, 0x77, 0x56, 0x66, 0x4a, 0xd2, 0x49, 0x5f}}, {Name: "test_quota.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x2d, 0x7, 0x67, 0xa1, 0x9a, 0xb7, 0xc3, 0xa4, 0x21, 0xcd, 0xba, 0x6a, 0x3, 0x49, 0x20, 0x43, 0x67, 0xc2, 0x2c, 0x81},
 			},
 			{
-				Name: "test_rtree.c", Mode: 0644,
+				Name: "test_rtree.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf5, 0x4a, 0xe9, 0xb0, 0x63, 0xbb, 0x73, 0x71, 0x2f, 0xcf, 0xc1, 0xc6, 0x83, 0x2e, 0x2a, 0x50, 0xf6, 0x2a, 0x97, 0xe7},
 			},
 			{
-				Name: "test_schema.c", Mode: 0644,
+				Name: "test_schema.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x12, 0x64, 0x44, 0x67, 0x64, 0x7d, 0x51, 0x39, 0x4a, 0x1, 0xf9, 0xfa, 0x60, 0x37, 0x62, 0x98, 0x18, 0x54, 0x66, 0xfd},
 			},
 			{
-				Name: "test_server.c", Mode: 0644,
+				Name: "test_server.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xed, 0x8, 0x18, 0xe6, 0xf6, 0x5f, 0x27, 0x28, 0x2d, 0xc7, 0xb1, 0xc1, 0x90, 0xec, 0x18, 0x8c, 0x89, 0x33, 0x0, 0x2b},
 			},
 			{
-				Name: "test_sqllog.c", Mode: 0644,
+				Name: "test_sqllog.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x4a, 0xa6, 0x8b, 0x7c, 0x42, 0x93, 0x23, 0xb8, 0xee, 0xbe, 0x6c, 0x9c, 0x2d, 0x7, 0xfc, 0x66, 0xd, 0x8d, 0x47, 0xc9},
 			},
 			{
-				Name: "test_stat.c", Mode: 0644,
+				Name: "test_stat.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd4, 0xc9, 0x2, 0xb5, 0xea, 0x11, 0x1a, 0xd5, 0x8a, 0x73, 0x71, 0x12, 0xc2, 0x8f, 0x0, 0x38, 0x43, 0x4c, 0x85, 0xc0},
 			},
 			{
-				Name: "test_superlock.c", Mode: 0644,
+				Name: "test_superlock.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x93, 0x6f, 0xca, 0xd0, 0xc5, 0x6f, 0x6b, 0xc8, 0x58, 0x9, 0x74, 0x2f, 0x6a, 0xe1, 0xc1, 0xee, 0xb8, 0xb7, 0xd2, 0xf1},
 			},
 			{
-				Name: "test_syscall.c", Mode: 0644,
+				Name: "test_syscall.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x7c, 0x8, 0x73, 0xc1, 0x6d, 0x84, 0x32, 0x2, 0xf3, 0xe, 0x2d, 0xb9, 0x45, 0x9f, 0xa2, 0x99, 0x75, 0xea, 0x5e, 0x68},
 			},
 			{
-				Name: "test_tclvar.c", Mode: 0644,
+				Name: "test_tclvar.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x12, 0x19, 0x19, 0xc, 0x3, 0x0, 0xfd, 0x5e, 0xc7, 0xa3, 0xc5, 0x84, 0x8, 0xf3, 0x38, 0x43, 0xd2, 0xe, 0xee, 0x15},
 			},
 			{
-				Name: "test_thread.c", Mode: 0644,
+				Name: "test_thread.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x2f, 0x93, 0x63, 0xb7, 0x50, 0x1e, 0x51, 0x19, 0x81, 0xfe, 0x32, 0x83, 0x1f, 0xf2, 0xe8, 0xfd, 0x2f, 0x30, 0xc4, 0x93},
 			},
 			{
-				Name: "test_vfs.c", Mode: 0644,
+				Name: "test_vfs.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xfc, 0xd5, 0x77, 0x43, 0x9c, 0xfd, 0x6c, 0x72, 0xdd, 0xe4, 0x83, 0x58, 0x92, 0x14, 0x20, 0xcf, 0x6e, 0xf1, 0xf8, 0x6d},
 			},
 			{
-				Name: "test_vfstrace.c", Mode: 0644,
+				Name: "test_vfstrace.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xa, 0xac, 0xc0, 0x1f, 0xe4, 0x2e, 0x77, 0xfe, 0xb8, 0x58, 0xe4, 0xbe, 0xd0, 0xcb, 0x7e, 0x4, 0xa4, 0x35, 0xb2, 0x10},
 			},
 			{
-				Name: "test_wsd.c", Mode: 0644,
+				Name: "test_wsd.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x99, 0xe4, 0xa0, 0x56, 0x58, 0x1f, 0x58, 0xf4, 0x53, 0x6f, 0xdb, 0x5a, 0x5d, 0xf7, 0x5c, 0x74, 0x69, 0x8a, 0x81, 0x62},
 			},
 			{
-				Name: "tokenize.c", Mode: 0644,
+				Name: "tokenize.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xfa, 0xea, 0x5f, 0x26, 0xc7, 0x9c, 0x5e, 0x18, 0x8f, 0xa8, 0x7f, 0x2f, 0xdf, 0x6f, 0xf7, 0x6a, 0x7a, 0x60, 0x6, 0xc5},
 			},
 			{
-				Name: "trigger.c", Mode: 0644,
+				Name: "trigger.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf1, 0xff, 0x76, 0x6e, 0x20, 0x2a, 0x45, 0x18, 0xec, 0x10, 0xe5, 0x27, 0x12, 0xc, 0xd3, 0xe, 0x83, 0xfb, 0xd0, 0x34},
 			},
 			{
-				Name: "update.c", Mode: 0644,
+				Name: "update.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x3a, 0xb1, 0xab, 0x2a, 0x4b, 0x65, 0xda, 0x3f, 0x19, 0x8c, 0x15, 0x84, 0xd5, 0x4d, 0x36, 0xf1, 0x8c, 0xa1, 0x21, 0x4a},
 			},
 			{
-				Name: "utf.c", Mode: 0644,
+				Name: "utf.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x6d, 0x5b, 0x1b, 0xfe, 0x40, 0xc, 0x37, 0x48, 0xaa, 0x70, 0xa3, 0xb2, 0xfd, 0x5e, 0xe, 0xac, 0x5f, 0xc0, 0x4d, 0xe2},
 			},
 			{
-				Name: "util.c", Mode: 0644,
+				Name: "util.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xd8, 0x3a, 0x63, 0x1, 0x5f, 0xd8, 0x7d, 0xcc, 0x4f, 0xb4, 0x41, 0x66, 0xfa, 0xbf, 0x2e, 0x9b, 0xc9, 0x67, 0x1e, 0xb8},
 			},
 			{
-				Name: "vacuum.c", Mode: 0644,
+				Name: "vacuum.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x4a, 0xfb, 0x2c, 0xca, 0x64, 0xdd, 0x60, 0x76, 0x11, 0x22, 0x2c, 0x7, 0x93, 0x2d, 0x12, 0xea, 0xcf, 0xa, 0x2c, 0x22},
 			},
 			{
-				Name: "vdbe.c", Mode: 0644,
+				Name: "vdbe.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xf3, 0x43, 0xe1, 0x3d, 0x4e, 0x91, 0x78, 0x4b, 0x15, 0x88, 0x10, 0xc5, 0xb7, 0xd4, 0x46, 0x84, 0xdf, 0xbf, 0xa2, 0xa5},
 			},
 			{
-				Name: "vdbe.h", Mode: 0644,
+				Name: "vdbe.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xfa, 0x7b, 0x31, 0xb7, 0x27, 0xa, 0x90, 0xd4, 0xf6, 0x37, 0x36, 0x5a, 0xfc, 0xc9, 0xbd, 0xa1, 0xd1, 0xb1, 0xe1, 0xd6},
 			},
 			{
-				Name: "vdbeInt.h", Mode: 0644,
+				Name: "vdbeInt.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x3a, 0x5b, 0x40, 0x28, 0xbb, 0xd6, 0xc9, 0x56, 0x10, 0xd7, 0xc, 0xce, 0x3, 0x69, 0xdf, 0xcd, 0x60, 0x7a, 0xa9, 0x0},
 			},
 			{
-				Name: "vdbeapi.c", Mode: 0644,
+				Name: "vdbeapi.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x7c, 0x86, 0x1e, 0x2d, 0x47, 0x21, 0x8c, 0x91, 0x63, 0x31, 0x77, 0x77, 0xc3, 0x7, 0x21, 0x99, 0xe9, 0xb4, 0x2, 0x80},
 			},
 			{
-				Name: "vdbeaux.c", Mode: 0644,
+				Name: "vdbeaux.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x2c, 0x42, 0x69, 0xa5, 0x9e, 0x6d, 0xbc, 0xe8, 0x67, 0x1c, 0x47, 0x4f, 0x34, 0x61, 0x90, 0xbe, 0x2a, 0xe, 0x18, 0x51},
 			},
 			{
-				Name: "vdbeblob.c", Mode: 0644,
+				Name: "vdbeblob.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x2e, 0x8f, 0xd8, 0xee, 0x74, 0x47, 0xe6, 0x46, 0x46, 0xe3, 0x49, 0x4b, 0x4c, 0x4, 0x1d, 0x3a, 0x4a, 0xbb, 0x8, 0x85},
 			},
 			{
-				Name: "vdbemem.c", Mode: 0644,
+				Name: "vdbemem.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x8f, 0xc2, 0x22, 0xe2, 0xde, 0x20, 0x50, 0x14, 0x50, 0xec, 0xea, 0x9d, 0x4e, 0xbf, 0xaa, 0xc9, 0x81, 0x4a, 0xae, 0x59},
 			},
 			{
-				Name: "vdbesort.c", Mode: 0644,
+				Name: "vdbesort.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xfd, 0xfc, 0x4a, 0x79, 0xdd, 0xc9, 0x6e, 0x59, 0x9b, 0x1b, 0xe, 0xeb, 0xac, 0xbd, 0xb8, 0x45, 0xc6, 0x38, 0x13, 0xb2},
 			},
 			{
-				Name: "vdbetrace.c", Mode: 0644,
+				Name: "vdbetrace.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x35, 0x62, 0x77, 0xe8, 0xd2, 0x3b, 0xca, 0xdb, 0x67, 0x6b, 0x59, 0xd1, 0xa4, 0xdc, 0xf8, 0x42, 0xfd, 0xc4, 0xc9, 0x72},
 			},
 			{
-				Name: "vtab.c", Mode: 0644,
+				Name: "vtab.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x95, 0x82, 0x2, 0xc3, 0x1e, 0x24, 0x15, 0xb, 0x60, 0xf1, 0xa, 0x8a, 0xf, 0x74, 0x41, 0xaf, 0xac, 0x3f, 0xbb, 0x1c},
 			},
 			{
-				Name: "wal.c", Mode: 0644,
+				Name: "wal.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe6, 0x42, 0xea, 0x21, 0x5, 0xb5, 0xc5, 0x4a, 0xf3, 0x5, 0x88, 0x9, 0x62, 0x69, 0xab, 0x75, 0xcb, 0xef, 0x8f, 0xf2},
 			},
 			{
-				Name: "wal.h", Mode: 0644,
+				Name: "wal.h", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0x9, 0x25, 0x46, 0x35, 0x4b, 0x34, 0xc0, 0xab, 0x3d, 0x20, 0x5, 0x6a, 0x7f, 0x8a, 0x8a, 0x52, 0xe4, 0xd0, 0xb5, 0xf5},
 			},
 			{
-				Name: "walker.c", Mode: 0644,
+				Name: "walker.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe7, 0x1e, 0xd2, 0xac, 0x48, 0x4c, 0x91, 0x6c, 0x1c, 0xc1, 0x0, 0x7e, 0x5e, 0x5, 0xda, 0x47, 0x1c, 0xb4, 0x95, 0x99},
 			},
 			{
-				Name: "where.c", Mode: 0644,
+				Name: "where.c", Mode: filemode.Regular,
 				Hash: plumbing.Hash{0xe6, 0x14, 0xf4, 0xa6, 0xd8, 0x64, 0xe7, 0xe, 0xc4, 0x32, 0x8d, 0xb, 0xdb, 0x25, 0x4e, 0x3a, 0xc9, 0xf0, 0xd2, 0x87},
 			},
 		},
diff --git a/plumbing/object/treenoder.go b/plumbing/object/treenoder.go
index 73d96e2..89fcdb1 100644
--- a/plumbing/object/treenoder.go
+++ b/plumbing/object/treenoder.go
@@ -9,18 +9,17 @@ package object
 // to the file contents by the merkletrie difftree algorithm.  This is
 // consistent with how the "git diff-tree" command works.
 import (
-	"encoding/binary"
 	"io"
-	"os"
 
 	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/filemode"
 	"srcd.works/go-git.v4/utils/merkletrie/noder"
 )
 
 type treeNoder struct {
 	parent   *Tree  // the root node is its own parent
 	name     string // empty string for the root node
-	mode     os.FileMode
+	mode     filemode.FileMode
 	hash     plumbing.Hash
 	children []noder.Noder // memoized
 }
@@ -33,7 +32,7 @@ func newTreeNoder(t *Tree) *treeNoder {
 	return &treeNoder{
 		parent: t,
 		name:   "",
-		mode:   os.ModeDir,
+		mode:   filemode.Dir,
 		hash:   t.Hash,
 	}
 }
@@ -47,14 +46,7 @@ func (t *treeNoder) String() string {
 }
 
 func (t *treeNoder) Hash() []byte {
-	return append(t.hash[:], modeToBytes(t.mode)...)
-}
-
-// mode in little endian (endianess is an arbitrary decission).
-func modeToBytes(m os.FileMode) []byte {
-	ret := make([]byte, 4)
-	binary.LittleEndian.PutUint32(ret, uint32(m))
-	return ret
+	return append(t.hash[:], t.mode.Bytes()...)
 }
 
 func (t *treeNoder) Name() string {
@@ -62,13 +54,13 @@ func (t *treeNoder) Name() string {
 }
 
 func (t *treeNoder) IsDir() bool {
-	return t.mode.IsDir()
+	return t.mode == filemode.Dir
 }
 
 // Children will return the children of a treenoder as treenoders,
 // building them from the children of the wrapped git tree.
 func (t *treeNoder) Children() ([]noder.Noder, error) {
-	if !t.mode.IsDir() {
+	if t.mode != filemode.Dir {
 		return noder.NoChildren, nil
 	}