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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"encoding/json"
"fmt"
"io"
"os"
"github.com/datawire/dlib/dlog"
"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/btrfsprogs/btrfsinspect"
)
func init() {
inspectors = append(inspectors, subcommand{
Command: cobra.Command{
Use: "recover-chunks",
Short: "Rebuild broken chunk/dev-extent/blockgroup trees",
Long: "" +
"The rebuilt information is printed as JSON on stdout, and can\n" +
"be loaded by the --mappings flag.\n" +
"\n" +
"This is very similar to `btrfs rescue chunk-recover`, but (1)\n" +
"does a better job, (2) is less buggy, and (3) doesn't actually\n" +
"write the info back to the filesystem; instead writing it\n" +
"out-of-band to stdout.",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
},
RunE: func(fs *btrfs.FS, cmd *cobra.Command, _ []string) error {
ctx := cmd.Context()
dlog.Info(ctx, "Reading superblock...")
superblock, err := fs.Superblock()
if err != nil {
return err
}
for _, dev := range fs.LV.PhysicalVolumes() {
dlog.Infof(ctx, "dev[%q] Scanning for unreachable nodes...", dev.Name())
devResult, err := btrfsinspect.ScanOneDev(ctx, dev, *superblock)
if err != nil {
return err
}
dlog.Infof(ctx, "dev[%q] Re-inserting lost+found mappings...", dev.Name())
devResult.AddToLV(ctx, fs, dev)
}
dlog.Infof(ctx, "Writing reconstructed mappings to stdout...")
mappings := fs.LV.Mappings()
_, _ = io.WriteString(os.Stdout, "{\n \"Mappings\": [\n")
for i, mapping := range mappings {
suffix := ","
if i == len(mappings)-1 {
suffix = ""
}
bs, err := json.Marshal(mapping)
if err != nil {
return err
}
fmt.Printf(" %s%s\n", bs, suffix)
}
_, _ = io.WriteString(os.Stdout, " ]\n}\n")
return nil
},
})
}
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