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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"context"
"encoding/json"
"fmt"
"os"
"github.com/datawire/dlib/dgroup"
"github.com/datawire/dlib/dlog"
"github.com/datawire/ocibuild/pkg/cliutil"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsutil"
)
type logLevelFlag struct {
logrus.Level
}
func (lvl *logLevelFlag) Type() string { return "loglevel" }
func (lvl *logLevelFlag) Set(str string) error {
var err error
lvl.Level, err = logrus.ParseLevel(str)
return err
}
var _ pflag.Value = (*logLevelFlag)(nil)
type subcommand struct {
cobra.Command
RunE func(*btrfs.FS, *cobra.Command, []string) error
}
var inspectors, repairers []subcommand
func main() {
logLevelFlag := logLevelFlag{
Level: logrus.InfoLevel,
}
var pvsFlag []string
var mappingsFlag string
argparser := &cobra.Command{
Use: "btrfs-rec {[flags]|SUBCOMMAND}",
Short: "Recover (data from) a broken btrfs filesystem",
Args: cliutil.WrapPositionalArgs(cliutil.OnlySubcommands),
RunE: cliutil.RunSubcommands,
SilenceErrors: true, // main() will handle this after .ExecuteContext() returns
SilenceUsage: true, // our FlagErrorFunc will handle it
CompletionOptions: cobra.CompletionOptions{ //nolint:exhaustivestruct
DisableDefaultCmd: true,
},
}
argparser.SetFlagErrorFunc(cliutil.FlagErrorFunc)
argparser.SetHelpTemplate(cliutil.HelpTemplate)
argparser.PersistentFlags().Var(&logLevelFlag, "verbosity", "set the verbosity")
argparser.PersistentFlags().StringArrayVar(&pvsFlag, "pv", nil, "open the file `physical_volume` as part of the filesystem")
if err := argparser.MarkPersistentFlagFilename("pv"); err != nil {
panic(err)
}
if err := argparser.MarkPersistentFlagRequired("pv"); err != nil {
panic(err)
}
argparser.PersistentFlags().StringVar(&mappingsFlag, "mappings", "", "load chunk/dev-extent/blockgroup data from external JSON file `mappings.json`")
if err := argparser.MarkPersistentFlagFilename("mappings"); err != nil {
panic(err)
}
var openFlag int = os.O_RDONLY
argparserInspect := &cobra.Command{
Use: "inspect {[flags]|SUBCOMMAND}",
Short: "Inspect (but don't modify) a broken btrfs filesystem",
Args: cliutil.WrapPositionalArgs(cliutil.OnlySubcommands),
RunE: cliutil.RunSubcommands,
}
argparser.AddCommand(argparserInspect)
argparserRepair := &cobra.Command{
Use: "repair {[flags]|SUBCOMMAND}",
Short: "Repair a broken btrfs filesystem",
Args: cliutil.WrapPositionalArgs(cliutil.OnlySubcommands),
RunE: cliutil.RunSubcommands,
PersistentPreRunE: func(_ *cobra.Command, _ []string) error {
openFlag = os.O_RDWR
return nil
},
}
argparser.AddCommand(argparserRepair)
for _, cmdgrp := range []struct {
parent *cobra.Command
children []subcommand
}{
{argparserInspect, inspectors},
{argparserRepair, repairers},
} {
for _, child := range cmdgrp.children {
cmd := child.Command
runE := child.RunE
cmd.RunE = func(cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
logger := logrus.New()
logger.SetLevel(logLevelFlag.Level)
ctx = dlog.WithLogger(ctx, dlog.WrapLogrus(logger))
grp := dgroup.NewGroup(ctx, dgroup.GroupConfig{
EnableSignalHandling: true,
})
grp.Go("main", func(ctx context.Context) (err error) {
maybeSetErr := func(_err error) {
if _err != nil && err == nil {
err = _err
}
}
fs, err := btrfsutil.Open(ctx, openFlag, pvsFlag...)
if err != nil {
return err
}
defer func() {
maybeSetErr(fs.Close())
}()
if mappingsFlag != "" {
bs, err := os.ReadFile(mappingsFlag)
if err != nil {
return err
}
var mappingsJSON []btrfsvol.Mapping
if err := json.Unmarshal(bs, &mappingsJSON); err != nil {
return err
}
for _, mapping := range mappingsJSON {
if err := fs.LV.AddMapping(mapping); err != nil {
return err
}
}
}
cmd.SetContext(ctx)
return runE(fs, cmd, args)
})
return grp.Wait()
}
cmdgrp.parent.AddCommand(&cmd)
}
}
if err := argparser.ExecuteContext(context.Background()); err != nil {
fmt.Fprintf(os.Stderr, "%v: error: %v\n", argparser.CommandPath(), err)
os.Exit(1)
}
}
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