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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"path"
"strings"
"github.com/datawire/dlib/derror"
"github.com/datawire/ocibuild/pkg/cliutil"
"github.com/spf13/cobra"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
func init() {
inspectors = append(inspectors, subcommand{
Command: cobra.Command{
Use: "ls-files",
Short: "A listing of all files in the filesystem",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
},
RunE: func(fs *btrfs.FS, cmd *cobra.Command, _ []string) (err error) {
defer func() {
if r := derror.PanicToError(recover()); r != nil {
fmt.Printf("\n\n%+v\n", r)
err = fmt.Errorf("panicked")
}
}()
ctx := cmd.Context()
out := bufio.NewWriter(os.Stdout)
printSubvol(out, "", true, "/", &btrfs.Subvolume{
FS: btrfsutil.NewBrokenTrees(ctx, fs),
TreeID: btrfs.FS_TREE_OBJECTID,
})
out.Flush()
return nil
},
})
}
const (
tS = " "
tl = "│ "
tT = "├── "
tL = "└── "
)
func printText(out io.Writer, prefix string, isLast bool, name, text string) {
first, rest := tT, tl
if isLast {
first, rest = tL, tS
}
for i, line := range strings.Split(fmt.Sprintf("%q %s", name, text), "\n") {
_, _ = io.WriteString(out, prefix)
if i == 0 {
_, _ = io.WriteString(out, first)
} else {
_, _ = io.WriteString(out, rest)
}
_, _ = io.WriteString(out, line)
_, _ = io.WriteString(out, "\n")
}
}
func printSubvol(out io.Writer, prefix string, isLast bool, name string, subvol *btrfs.Subvolume) {
rootInode, err := subvol.GetRootInode()
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
dir, err := subvol.LoadDir(rootInode)
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
printDir(out, prefix, isLast, name, dir)
}
func fmtInode(inode btrfs.BareInode) string {
var mode btrfsitem.StatMode
if inode.InodeItem == nil {
inode.Errs = append(inode.Errs, errors.New("missing INODE_ITEM"))
} else {
mode = inode.InodeItem.Mode
}
ret := fmt.Sprintf("ino=%v mode=%v", inode.Inode, mode)
if len(inode.Errs) > 0 {
errStr := inode.Errs.Error()
if strings.Contains(errStr, "\n") {
ret += " err=\\\n" + errStr
} else {
ret += " err=" + errStr
}
}
return ret
}
func printDir(out io.Writer, prefix string, isLast bool, name string, dir *btrfs.Dir) {
printText(out, prefix, isLast, name, fmtInode(dir.BareInode))
if isLast {
prefix += tS
} else {
prefix += tl
}
for i, childName := range maps.SortedKeys(dir.ChildrenByName) {
printDirEntry(
out,
prefix,
i == len(dir.ChildrenByName)-1,
dir.SV,
path.Join(name, childName),
dir.ChildrenByName[childName])
}
}
func printDirEntry(out io.Writer, prefix string, isLast bool, subvol *btrfs.Subvolume, name string, entry btrfsitem.DirEntry) {
if len(entry.Data) != 0 {
panic(fmt.Errorf("TODO: I don't know how to handle dirent.data: %q", name))
}
switch entry.Type {
case btrfsitem.FT_DIR:
switch entry.Location.ItemType {
case btrfsitem.INODE_ITEM_KEY:
dir, err := subvol.LoadDir(entry.Location.ObjectID)
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
printDir(out, prefix, isLast, name, dir)
case btrfsitem.ROOT_ITEM_KEY:
printSubvol(out, prefix, isLast, name, &btrfs.Subvolume{
FS: subvol.FS,
TreeID: entry.Location.ObjectID,
})
default:
panic(fmt.Errorf("TODO: I don't know how to handle an FT_DIR with location.ItemType=%v: %q",
entry.Location.ItemType, name))
}
case btrfsitem.FT_SYMLINK:
if entry.Location.ItemType != btrfsitem.INODE_ITEM_KEY {
panic(fmt.Errorf("TODO: I don't know how to handle an FT_SYMLINK with location.ItemType=%v: %q",
entry.Location.ItemType, name))
}
file, err := subvol.LoadFile(entry.Location.ObjectID)
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
printSymlink(out, prefix, isLast, name, file)
case btrfsitem.FT_REG_FILE:
if entry.Location.ItemType != btrfsitem.INODE_ITEM_KEY {
panic(fmt.Errorf("TODO: I don't know how to handle an FT_REG_FILE with location.ItemType=%v: %q",
entry.Location.ItemType, name))
}
file, err := subvol.LoadFile(entry.Location.ObjectID)
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
printFile(out, prefix, isLast, name, file)
case btrfsitem.FT_SOCK:
if entry.Location.ItemType != btrfsitem.INODE_ITEM_KEY {
panic(fmt.Errorf("TODO: I don't know how to handle an FT_SOCK with location.ItemType=%v: %q",
entry.Location.ItemType, name))
}
file, err := subvol.LoadFile(entry.Location.ObjectID)
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
printSocket(out, prefix, isLast, name, file)
case btrfsitem.FT_FIFO:
if entry.Location.ItemType != btrfsitem.INODE_ITEM_KEY {
panic(fmt.Errorf("TODO: I don't know how to handle an FT_FIFO with location.ItemType=%v: %q",
entry.Location.ItemType, name))
}
file, err := subvol.LoadFile(entry.Location.ObjectID)
if err != nil {
printText(out, prefix, isLast, name, "err="+err.Error())
return
}
printPipe(out, prefix, isLast, name, file)
default:
panic(fmt.Errorf("TODO: I don't know how to handle an fileType=%v: %q",
entry.Type, name))
}
}
func printSymlink(out io.Writer, prefix string, isLast bool, name string, file *btrfs.File) {
var tgt []byte
if file.InodeItem != nil {
var err error
tgt, err = io.ReadAll(io.NewSectionReader(file, 0, file.InodeItem.Size))
if err != nil {
file.Errs = append(file.Errs, err)
}
}
printText(out, prefix, isLast, name, fmt.Sprintf(
"-> %q : %s",
tgt,
fmtInode(file.BareInode)))
}
func printFile(out io.Writer, prefix string, isLast bool, name string, file *btrfs.File) {
if file.InodeItem != nil {
if _, err := io.Copy(io.Discard, io.NewSectionReader(file, 0, file.InodeItem.Size)); err != nil {
file.Errs = append(file.Errs, err)
}
}
printText(out, prefix, isLast, name, fmtInode(file.BareInode))
}
func printSocket(out io.Writer, prefix string, isLast bool, name string, file *btrfs.File) {
if file.InodeItem != nil && file.InodeItem.Size > 0 {
panic(fmt.Errorf("TODO: I don't know how to handle a socket with size>0: %q", name))
}
printText(out, prefix, isLast, name, fmtInode(file.BareInode))
}
func printPipe(out io.Writer, prefix string, isLast bool, name string, file *btrfs.File) {
if file.InodeItem != nil && file.InodeItem.Size > 0 {
panic(fmt.Errorf("TODO: I don't know how to handle a pipe with size>0: %q", name))
}
printText(out, prefix, isLast, name, fmtInode(file.BareInode))
}
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