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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
// Command btrfs-rec is used to recover (data from) a broken btrfs
// filesystem.
package main
import (
"context"
"fmt"
"os"
"github.com/datawire/dlib/dgroup"
"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/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsutil"
"git.lukeshu.com/btrfs-progs-ng/lib/profile"
"git.lukeshu.com/btrfs-progs-ng/lib/textui"
)
var (
inspectors = &cobra.Command{
Use: "inspect {[flags]|SUBCOMMAND}",
Short: "Inspect (but don't modify) a broken btrfs filesystem",
Args: cliutil.WrapPositionalArgs(cliutil.OnlySubcommands),
RunE: cliutil.RunSubcommands,
}
repairers = &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 {
globalFlags.openFlag = os.O_RDWR
return nil
},
}
)
var globalFlags struct {
logLevel textui.LogLevelFlag
pvs []string
mappings string
stopProfiling profile.StopFunc
openFlag int
}
func noError(err error) {
if err != nil {
panic(fmt.Errorf("should not happen: %w", err))
}
}
func main() {
// Base argparser
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{
DisableDefaultCmd: true,
},
}
argparser.SetFlagErrorFunc(cliutil.FlagErrorFunc)
argparser.SetHelpTemplate(cliutil.HelpTemplate)
// Global flags
globalFlags.logLevel.Level = dlog.LogLevelInfo
argparser.PersistentFlags().Var(&globalFlags.logLevel, "verbosity", "set the verbosity")
argparser.PersistentFlags().StringArrayVar(&globalFlags.pvs, "pv", nil, "open the file `physical_volume` as part of the filesystem")
noError(argparser.MarkPersistentFlagFilename("pv"))
argparser.PersistentFlags().StringVar(&globalFlags.mappings, "mappings", "", "load chunk/dev-extent/blockgroup data from external JSON file `mappings.json`")
noError(argparser.MarkPersistentFlagFilename("mappings"))
globalFlags.stopProfiling = profile.AddProfileFlags(argparser.PersistentFlags(), "profile.")
globalFlags.openFlag = os.O_RDONLY
// Sub-commands
argparser.AddCommand(inspectors)
argparser.AddCommand(repairers)
// Run
if err := argparser.ExecuteContext(context.Background()); err != nil {
textui.Fprintf(os.Stderr, "%v: error: %v\n", argparser.CommandPath(), err)
os.Exit(1)
}
}
func run(runE func(*cobra.Command, []string) error) func(*cobra.Command, []string) error {
return func(cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
logger := textui.NewLogger(os.Stderr, globalFlags.logLevel.Level)
ctx = dlog.WithLogger(ctx, logger)
if globalFlags.logLevel.Level >= dlog.LogLevelDebug {
ctx = dlog.WithField(ctx, "mem", new(textui.LiveMemUse))
}
dlog.SetFallbackLogger(logger.WithField("btrfs-progs.THIS_IS_A_BUG", true))
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
}
}
defer func() {
maybeSetErr(globalFlags.stopProfiling())
}()
cmd.SetContext(ctx)
return runE(cmd, args)
})
return grp.Wait()
}
}
func runWithRawFS(runE func(*btrfs.FS, *cobra.Command, []string) error) func(*cobra.Command, []string) error {
return run(func(cmd *cobra.Command, args []string) (err error) {
maybeSetErr := func(_err error) {
if _err != nil && err == nil {
err = _err
}
}
if len(globalFlags.pvs) == 0 {
// We do this here instead of calling argparser.MarkPersistentFlagRequired("pv") so that
// it doesn't interfere with the `help` sub-command.
return cliutil.FlagErrorFunc(cmd, fmt.Errorf("must specify 1 or more physical volumes with --pv"))
}
fs, err := btrfsutil.Open(cmd.Context(), globalFlags.openFlag, globalFlags.pvs...)
if err != nil {
return err
}
defer func() {
maybeSetErr(fs.Close())
}()
if globalFlags.mappings != "" {
mappingsJSON, err := readJSONFile[[]btrfsvol.Mapping](cmd.Context(), globalFlags.mappings)
if err != nil {
return err
}
for _, mapping := range mappingsJSON {
if err := fs.LV.AddMapping(mapping); err != nil {
return err
}
}
}
return runE(fs, cmd, args)
})
}
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