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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"bufio"
"io"
"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/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect"
)
func init() {
inspectors = append(inspectors, subcommand{
Command: cobra.Command{
Use: "scandevices",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
},
RunE: func(fs *btrfs.FS, cmd *cobra.Command, _ []string) (err error) {
ctx := cmd.Context()
results, err := btrfsinspect.ScanDevices(ctx, fs)
if err != nil {
return err
}
dlog.Info(ctx, "Writing scan results to stdout...")
return writeScanResults(os.Stdout, results)
},
})
}
func writeScanResults(w io.Writer, results btrfsinspect.ScanDevicesResult) (err error) {
buffer := bufio.NewWriter(w)
defer func() {
if _err := buffer.Flush(); err == nil && _err != nil {
err = _err
}
}()
return lowmemjson.Encode(&lowmemjson.ReEncoder{
Out: buffer,
Indent: "\t",
ForceTrailingNewlines: true,
CompactIfUnder: 16,
}, results)
}
func readScanResults(filename string) (btrfsinspect.ScanDevicesResult, error) {
fh, err := os.Open(filename)
if err != nil {
return nil, err
}
var scanResults btrfsinspect.ScanDevicesResult
buf := bufio.NewReader(fh)
if err := lowmemjson.DecodeThenEOF(buf, &scanResults); err != nil {
return nil, err
}
_ = fh.Close()
return scanResults, nil
}
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