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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"
"runtime"
"time"
"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/rebuildtrees"
"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/textui"
)
func init() {
var nodeListFilename string
cmd := &cobra.Command{
Use: "rebuild-trees",
Long: "" +
"Rebuild broken btrees based on missing items that are implied " +
"by present items. This requires functioning " +
"chunk/dev-extent/blockgroup trees, which can be rebuilt " +
"separately with `btrfs-rec inspect rebuild-mappings`.\n" +
"\n" +
"If no --node-list is given, then a slow sector-by-sector scan " +
"will be used to find all nodes.",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
RunE: runWithRawFS(func(fs *btrfs.FS, cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
var nodeList []btrfsvol.LogicalAddr
var err error
if nodeListFilename != "" {
nodeList, err = readJSONFile[[]btrfsvol.LogicalAddr](ctx, nodeListFilename)
} else {
nodeList, err = btrfsutil.ListNodes(ctx, fs)
}
if err != nil {
return err
}
rebuilder, err := rebuildtrees.NewRebuilder(ctx, fs, nodeList)
if err != nil {
return err
}
runtime.GC()
time.Sleep(textui.LiveMemUseUpdateInterval) // let the logs reflect that GC right away
dlog.Info(ctx, "Rebuilding node tree...")
rebuildErr := rebuilder.Rebuild(ctx)
dst := os.Stdout
if rebuildErr != nil {
dst = os.Stderr
dlog.Errorf(ctx, "rebuild error: %v", rebuildErr)
}
dlog.Infof(ctx, "Writing re-built nodes to %s...", dst.Name())
if err := writeJSONFile(dst, rebuilder.ListRoots(ctx), lowmemjson.ReEncoderConfig{
Indent: "\t",
CompactIfUnder: 80, //nolint:gomnd // This is what looks nice.
ForceTrailingNewlines: true,
}); err != nil {
if rebuildErr != nil {
return rebuildErr
}
return err
}
dlog.Info(ctx, "... done writing")
return rebuildErr
}),
}
cmd.Flags().StringVar(&nodeListFilename, "node-list", "",
"Output of 'btrfs-recs inspect [rebuild-mappings] list-nodes' to use for the node list")
noError(cmd.MarkFlagFilename("node-list"))
inspectors.AddCommand(cmd)
}
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