diskii/cmd/dump.go

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// Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
"github.com/zellyn/diskii/lib/disk"
)
// dumpCmd represents the dump command, used to dump the raw contents
// of a file.
var dumpCmd = &cobra.Command{
Use: "dump",
Short: "dump the raw contents of a file",
Long: `Dump the raw contents of a file.
dump disk-image.dsk HELLO
`,
Run: func(cmd *cobra.Command, args []string) {
if err := runDump(args); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(-1)
}
},
}
func init() {
RootCmd.AddCommand(dumpCmd)
}
// runDump performs the actual dump logic.
func runDump(args []string) error {
if len(args) != 2 {
return fmt.Errorf("dump expects a disk image filename, and a filename")
}
sd, err := disk.Open(args[0])
if err != nil {
return err
}
op, err := disk.OperatorFor(sd)
if err != nil {
return err
}
file, err := op.GetFile(args[1])
if err != nil {
return err
}
// TODO(zellyn): allow writing to files
os.Stdout.Write(file.Data)
return nil
}