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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"os"
"git.lukeshu.com/go/lowmemjson"
"github.com/datawire/dlib/dlog"
"github.com/datawire/ocibuild/pkg/cliutil"
"github.com/spf13/cobra"
"git.lukeshu.com/btrfs-progs-ng/cmd/btrfs-rec/inspect/rebuildmappings"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
)
func init() {
cmd := &cobra.Command{
Use: "rebuild-mappings",
Short: "Rebuild broken chunk/dev-extent/blockgroup trees",
Long: "" +
"The rebuilt information is printed as JSON on stdout, and can " +
"be loaded by the --mappings flag.\n" +
"\n" +
"This is very similar to `btrfs rescue chunk-recover`, but (1) " +
"does a better job, (2) is less buggy, and (3) doesn't actually " +
"write the info back to the filesystem; instead writing it " +
"out-of-band to stdout.\n" +
"\n" +
"The I/O and the CPU parts of this can be split up as:\n" +
"\n" +
"\tbtrfs-rec inspect rebuild-mappings scan > SCAN.json # read\n" +
"\tbtrfs-rec inspect rebuild-mappings process SCAN.json # CPU\n",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
RunE: runWithRawFS(func(fs *btrfs.FS, cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
scanResults, err := rebuildmappings.ScanDevices(ctx, fs)
if err != nil {
return err
}
if err := rebuildmappings.RebuildMappings(ctx, fs, scanResults); err != nil {
return err
}
dlog.Infof(ctx, "Writing reconstructed mappings to stdout...")
if err := writeJSONFile(os.Stdout, fs.LV.Mappings(), lowmemjson.ReEncoderConfig{
Indent: "\t",
ForceTrailingNewlines: true,
CompactIfUnder: 120, //nolint:gomnd // This is what looks nice.
}); err != nil {
return err
}
dlog.Info(ctx, "... done writing")
return nil
}),
}
cmd.AddCommand(&cobra.Command{
Use: "scan",
Short: "Read from the filesystem all data nescessary to rebuild the mappings",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
RunE: runWithRawFS(func(fs *btrfs.FS, cmd *cobra.Command, _ []string) (err error) {
ctx := cmd.Context()
scanResults, err := rebuildmappings.ScanDevices(ctx, fs)
if err != nil {
return err
}
dlog.Info(ctx, "Writing scan results to stdout...")
if err := writeJSONFile(os.Stdout, scanResults, lowmemjson.ReEncoderConfig{
Indent: "\t",
ForceTrailingNewlines: true,
CompactIfUnder: 16, //nolint:gomnd // This is what looks nice.
}); err != nil {
return err
}
dlog.Info(ctx, "... done writing")
return nil
}),
})
cmd.AddCommand(&cobra.Command{
Use: "process",
Short: "Rebuild the mappings based on previously read data",
Args: cliutil.WrapPositionalArgs(cobra.ExactArgs(1)),
RunE: runWithRawFS(func(fs *btrfs.FS, cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
dlog.Infof(ctx, "Reading %q...", args[0])
scanResults, err := readJSONFile[rebuildmappings.ScanDevicesResult](ctx, args[0])
if err != nil {
return err
}
dlog.Infof(ctx, "... done reading %q", args[0])
if err := rebuildmappings.RebuildMappings(ctx, fs, scanResults); err != nil {
return err
}
dlog.Infof(ctx, "Writing reconstructed mappings to stdout...")
if err := writeJSONFile(os.Stdout, fs.LV.Mappings(), lowmemjson.ReEncoderConfig{
Indent: "\t",
ForceTrailingNewlines: true,
CompactIfUnder: 120, //nolint:gomnd // This is what looks nice.
}); err != nil {
return err
}
dlog.Info(ctx, "... done writing")
return nil
}),
})
inspectors.AddCommand(cmd)
}
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