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package main
import (
"fmt"
"os"
"lukeshu.com/btrfs-tools/pkg/btrfs"
"lukeshu.com/btrfs-tools/pkg/btrfs/btrfsvol"
"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_RDWR, imgfilenames...)
if err != nil {
return err
}
defer func() {
maybeSetErr(fs.Close())
}()
var uuidsInited bool
var metadataUUID, chunkTreeUUID btrfs.UUID
var treeName string
var treeID btrfs.ObjID
btrfsmisc.WalkFS(fs, btrfsmisc.WalkFSHandler{
PreTree: func(name string, id btrfs.ObjID, _ btrfsvol.LogicalAddr) {
treeName = name
treeID = id
},
Err: func(err error) {
fmt.Printf("error: %v\n", err)
},
UnsafeNodes: true,
TreeWalkHandler: btrfs.TreeWalkHandler{
Node: func(path btrfs.TreePath, node *util.Ref[btrfsvol.LogicalAddr, btrfs.Node], err error) error {
if node == nil || err == nil {
if !uuidsInited {
metadataUUID = node.Data.Head.MetadataUUID
chunkTreeUUID = node.Data.Head.ChunkTreeUUID
uuidsInited = true
}
return nil
}
origErr := err
if !uuidsInited {
return fmt.Errorf("cannot repair node@%v: not (yet?) sure what the chunk tree UUID is", node.Addr)
}
node.Data = btrfs.Node{
Size: node.Data.Size,
ChecksumType: node.Data.ChecksumType,
Head: btrfs.NodeHeader{
//Checksum: filled below,
MetadataUUID: metadataUUID,
Addr: node.Addr,
Flags: btrfs.NodeWritten,
BackrefRev: btrfs.MixedBackrefRev,
ChunkTreeUUID: chunkTreeUUID,
Generation: 0,
Owner: treeID,
NumItems: 0,
Level: path[len(path)-1].NodeLevel,
},
}
node.Data.Head.Checksum, err = node.Data.CalculateChecksum()
if err != nil {
return btrfsmisc.WalkErr{
TreeName: treeName,
Path: path,
Err: err,
}
}
if err := node.Write(); err != nil {
return err
}
fmt.Printf("fixed node@%v (err was %v)\n", node.Addr, origErr)
return nil
},
},
})
return nil
}
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