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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"context"
"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/rebuildmappings"
"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/textui"
)
func init() {
inspectors = append(inspectors, subcommand{
Command: cobra.Command{
Use: "rebuild-nodes NODESCAN.json",
Args: cliutil.WrapPositionalArgs(cobra.ExactArgs(1)),
},
RunE: func(fs *btrfs.FS, cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
// This is wrapped in a func in order to *ensure* that `nodeScanResults` goes out of scope once
// `rebuilder` has been created.
rebuilder, err := func(ctx context.Context) (rebuildtrees.Rebuilder, error) {
dlog.Infof(ctx, "Reading %q...", args[0])
nodeScanResults, err := readJSONFile[rebuildmappings.ScanDevicesResult](ctx, args[0])
if err != nil {
return nil, err
}
dlog.Infof(ctx, "... done reading %q", args[0])
return rebuildtrees.NewRebuilder(ctx, fs, nodeScanResults)
}(ctx)
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
},
})
}
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