Move files to different packages [ci-skip]

3 files changed, 243 insertions, 0 deletions

diff --git a/lib/btrfs/btrfsitem/statmode.go b/lib/btrfs/btrfsitem/statmode.go
new file mode 100644
index 0000000..2cca56d
--- /dev/null
+++ b/lib/btrfs/btrfsitem/statmode.go
@@ -0,0 +1,100 @@
+// Copyright (C) 2020-2021  Ambassador Labs
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Based on https://github.com/datawire/ocibuild/blob/master/pkg/python/stat.go
+
+package linux
+
+type StatMode uint32
+
+//nolint:deadcode,varcheck // not all of these modes will be used
+const (
+	// 16 bits = 5⅓ octal characters
+
+	ModeFmt StatMode = 0o17_0000 // mask for the type bits
+
+	_ModeFmtUnused000  StatMode = 0o00_0000
+	ModeFmtNamedPipe   StatMode = 0o01_0000 // type: named pipe (FIFO)
+	ModeFmtCharDevice  StatMode = 0o02_0000 // type: character device
+	_ModeFmtUnused003  StatMode = 0o03_0000
+	ModeFmtDir         StatMode = 0o04_0000 // type: directory
+	_ModeFmtUnused005  StatMode = 0o05_0000
+	ModeFmtBlockDevice StatMode = 0o06_0000 // type: block device
+	_ModeFmtUnused007  StatMode = 0o07_0000
+	ModeFmtRegular     StatMode = 0o10_0000 // type: regular file
+	_ModeFmtUnused011  StatMode = 0o11_0000
+	ModeFmtSymlink     StatMode = 0o12_0000 // type: symbolic link
+	_ModeFmtUnused013  StatMode = 0o13_0000
+	ModeFmtSocket      StatMode = 0o14_0000 // type: socket file
+	_ModeFmtUnused015  StatMode = 0o15_0000
+	_ModeFmtUnused016  StatMode = 0o16_0000
+	_ModeFmtUnused017  StatMode = 0o17_0000
+
+	ModePerm StatMode = 0o00_7777 // mask for permission bits
+
+	ModePermSetUID StatMode = 0o00_4000 // permission: set user id
+	ModePermSetGID StatMode = 0o00_2000 // permission: set group ID
+	ModePermSticky StatMode = 0o00_1000 // permission: sticky bit
+
+	ModePermUsrR StatMode = 0o00_0400 // permission: user: read
+	ModePermUsrW StatMode = 0o00_0200 // permission: user: write
+	ModePermUsrX StatMode = 0o00_0100 // permission: user: execute
+
+	ModePermGrpR StatMode = 0o00_0040 // permission: group: read
+	ModePermGrpW StatMode = 0o00_0020 // permission: group: write
+	ModePermGrpX StatMode = 0o00_0010 // permission: group: execute
+
+	ModePermOthR StatMode = 0o00_0004 // permission: other: read
+	ModePermOthW StatMode = 0o00_0002 // permission: other: write
+	ModePermOthX StatMode = 0o00_0001 // permission: other: execute
+)
+
+// IsDir reports whether mode describes a directory.
+//
+// That is, it tests that the ModeFmt bits are set to ModeFmtDir.
+func (mode StatMode) IsDir() bool {
+	return mode&ModeFmt == ModeFmtDir
+}
+
+// IsRegular reports whether m describes a regular file.
+//
+// That is, it tests that the ModeFmt bits are set to ModeFmtRegular.
+func (mode StatMode) IsRegular() bool {
+	return mode&ModeFmt == ModeFmtRegular
+}
+
+// String returns a textual representation of the mode.
+//
+// This is the format that POSIX specifies for showing the mode in the
+// output of the `ls -l` command.  POSIX does not specify the
+// character to use to indicate a ModeFmtSocket file; this method uses
+// 's' (GNU `ls` behavior; though POSIX notes that many
+// implementations use '=' for sockets).
+func (mode StatMode) String() string {
+	buf := [10]byte{
+		// type: This string is easy; it directly pairs with
+		// the above ModeFmtXXX list above; the character in
+		// the string left-to-right corresponds with the
+		// constant in the list top-to-bottom.
+		"?pc?d?b?-?l?s???"[mode>>12],
+
+		// owner
+		"-r"[(mode>>8)&0o1],
+		"-w"[(mode>>7)&0o1],
+		"-xSs"[((mode>>6)&0o1)|((mode>>10)&0o2)],
+
+		// group
+		"-r"[(mode>>5)&0o1],
+		"-w"[(mode>>4)&0o1],
+		"-xSs"[((mode>>3)&0o1)|((mode>>9)&0o2)],
+
+		// group
+		"-r"[(mode>>2)&0o1],
+		"-w"[(mode>>1)&0o1],
+		"-xTt"[((mode>>0)&0o1)|((mode>>8)&0o2)],
+	}
+
+	return string(buf[:])
+}
diff --git a/lib/btrfs/internal/uuid.go b/lib/btrfs/internal/uuid.go
new file mode 100644
index 0000000..a16d10f
--- /dev/null
+++ b/lib/btrfs/internal/uuid.go
@@ -0,0 +1,76 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package util
+
+import (
+	"encoding/hex"
+	"fmt"
+	"strings"
+)
+
+type UUID [16]byte
+
+func (uuid UUID) String() string {
+	str := hex.EncodeToString(uuid[:])
+	return strings.Join([]string{
+		str[:8],
+		str[8:12],
+		str[12:16],
+		str[16:20],
+		str[20:32],
+	}, "-")
+}
+
+func (a UUID) Cmp(b UUID) int {
+	for i := range a {
+		if d := int(a[i]) - int(b[i]); d != 0 {
+			return d
+		}
+	}
+	return 0
+}
+
+func (uuid UUID) Format(f fmt.State, verb rune) {
+	FormatByteArrayStringer(uuid, uuid[:], f, verb)
+}
+
+func ParseUUID(str string) (UUID, error) {
+	var ret UUID
+	j := 0
+	for i := 0; i < len(str); i++ {
+		if j >= len(ret)*2 {
+			return UUID{}, fmt.Errorf("too long to be a UUID: %q|%q", str[:i], str[i:])
+		}
+		c := str[i]
+		var v byte
+		switch {
+		case '0' <= c && c <= '9':
+			v = c - '0'
+		case 'a' <= c && c <= 'f':
+			v = c - 'a' + 10
+		case 'A' <= c && c <= 'F':
+			v = c - 'A' + 10
+		case c == '-':
+			continue
+		default:
+			return UUID{}, fmt.Errorf("illegal byte in UUID: %q|%q|%q", str[:i], str[i:i+1], str[i+1:])
+		}
+		if j%2 == 0 {
+			ret[j/2] = v << 4
+		} else {
+			ret[j/2] = (ret[j/2] & 0xf0) | (v & 0x0f)
+		}
+		j++
+	}
+	return ret, nil
+}
+
+func MustParseUUID(str string) UUID {
+	ret, err := ParseUUID(str)
+	if err != nil {
+		panic(err)
+	}
+	return ret
+}
diff --git a/lib/btrfs/internal/uuid_test.go b/lib/btrfs/internal/uuid_test.go
new file mode 100644
index 0000000..747ff6b
--- /dev/null
+++ b/lib/btrfs/internal/uuid_test.go
@@ -0,0 +1,67 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package util_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/util"
+)
+
+func TestParseUUID(t *testing.T) {
+	t.Parallel()
+	type TestCase struct {
+		Input     string
+		OutputVal util.UUID
+		OutputErr string
+	}
+	testcases := map[string]TestCase{
+		"basic":    {Input: "a0dd94ed-e60c-42e8-8632-64e8d4765a43", OutputVal: util.UUID{0xa0, 0xdd, 0x94, 0xed, 0xe6, 0x0c, 0x42, 0xe8, 0x86, 0x32, 0x64, 0xe8, 0xd4, 0x76, 0x5a, 0x43}},
+		"too-long": {Input: "a0dd94ed-e60c-42e8-8632-64e8d4765a43a", OutputErr: `too long to be a UUID: "a0dd94ed-e60c-42e8-8632-64e8d4765a43"|"a"`},
+		"bad char": {Input: "a0dd94ej-e60c-42e8-8632-64e8d4765a43a", OutputErr: `illegal byte in UUID: "a0dd94e"|"j"|"-e60c-42e8-8632-64e8d4765a43a"`},
+	}
+	for tcName, tc := range testcases {
+		tc := tc
+		t.Run(tcName, func(t *testing.T) {
+			t.Parallel()
+			val, err := util.ParseUUID(tc.Input)
+			assert.Equal(t, tc.OutputVal, val)
+			if tc.OutputErr == "" {
+				assert.NoError(t, err)
+			} else {
+				assert.EqualError(t, err, tc.OutputErr)
+			}
+		})
+	}
+}
+
+func TestUUIDFormat(t *testing.T) {
+	t.Parallel()
+	type TestCase struct {
+		InputUUID util.UUID
+		InputFmt  string
+		Output    string
+	}
+	uuid := util.MustParseUUID("a0dd94ed-e60c-42e8-8632-64e8d4765a43")
+	testcases := map[string]TestCase{
+		"s":     {InputUUID: uuid, InputFmt: "%s", Output: "a0dd94ed-e60c-42e8-8632-64e8d4765a43"},
+		"x":     {InputUUID: uuid, InputFmt: "%x", Output: "a0dd94ede60c42e8863264e8d4765a43"},
+		"X":     {InputUUID: uuid, InputFmt: "%X", Output: "A0DD94EDE60C42E8863264E8D4765A43"},
+		"v":     {InputUUID: uuid, InputFmt: "%v", Output: "a0dd94ed-e60c-42e8-8632-64e8d4765a43"},
+		"40s":   {InputUUID: uuid, InputFmt: "|% 40s", Output: "|    a0dd94ed-e60c-42e8-8632-64e8d4765a43"},
+		"#115v": {InputUUID: uuid, InputFmt: "|%#115v", Output: "|           util.UUID{0xa0, 0xdd, 0x94, 0xed, 0xe6, 0xc, 0x42, 0xe8, 0x86, 0x32, 0x64, 0xe8, 0xd4, 0x76, 0x5a, 0x43}"},
+	}
+	for tcName, tc := range testcases {
+		tc := tc
+		t.Run(tcName, func(t *testing.T) {
+			t.Parallel()
+			actual := fmt.Sprintf(tc.InputFmt, tc.InputUUID)
+			assert.Equal(t, tc.Output, actual)
+		})
+	}
+}