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package main
import (
"fmt"
"os"
"lukeshu.com/btrfs-tools/pkg/btrfs"
"lukeshu.com/btrfs-tools/pkg/btrfs/btrfsitem"
"lukeshu.com/btrfs-tools/pkg/btrfsmisc"
"lukeshu.com/btrfs-tools/pkg/util"
)
func main() {
if err := Main(os.Args[1:]...); err != nil {
fmt.Fprintf(os.Stderr, "%v: error: %v\n", os.Args[0], err)
os.Exit(1)
}
}
func Main(imgfilenames ...string) (err error) {
maybeSetErr := func(_err error) {
if _err != nil && err == nil {
err = _err
}
}
fs, err := btrfsmisc.Open(os.O_RDONLY, imgfilenames...)
if err != nil {
return err
}
defer func() {
maybeSetErr(fs.Close())
}()
sb, err := fs.Superblock()
if err != nil {
return err
}
fsTreeRoot, err := fs.TreeLookup(sb.Data.RootTree, btrfs.Key{
ObjectID: btrfs.FS_TREE_OBJECTID,
ItemType: btrfsitem.ROOT_ITEM_KEY,
Offset: 0,
})
if err != nil {
return fmt.Errorf("look up FS_TREE: %w", err)
}
fsTreeRootBody := fsTreeRoot.Body.(btrfsitem.Root)
fsTree := fsTreeRootBody.ByteNr
return printDir(fs, fsTree, "", "/", fsTreeRootBody.RootDirID, fsTreeRootBody.Inode)
}
func printDir(fs *btrfs.FS, fsTree btrfs.LogicalAddr, prefix, dirName string, dirInodeNum btrfs.ObjID, dirInode btrfsitem.Inode) error {
fmt.Printf("%s[%s\tino=%d\tuid=%d\tgid=%d\tsize=%d] %s\n",
prefix,
dirInode.Mode, dirInodeNum, dirInode.UID, dirInode.GID, dirInode.Size,
dirName)
items, err := fs.TreeSearchAll(fsTree, func(key btrfs.Key) int {
return util.CmpUint(dirInodeNum, key.ObjectID)
})
if err != nil {
return fmt.Errorf("read directory %q: %w", dirName, err)
}
for _, item := range items {
switch item.Head.Key.ItemType {
case btrfsitem.INODE_ITEM_KEY:
// TODO
case btrfsitem.INODE_REF_KEY:
// TODO
case btrfsitem.DIR_ITEM_KEY:
// skip?
case btrfsitem.DIR_INDEX_KEY:
for _, entry := range item.Body.(btrfsitem.DirList) {
fmt.Println(string(entry.Name))
}
case btrfsitem.XATTR_ITEM_KEY:
default:
panic(fmt.Errorf("TODO: handle item type %v", item.Head.Key.ItemType))
}
}
return nil
}
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