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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"context"
"fmt"
"os"
"github.com/google/subcommands"
"gvisor.dev/gvisor/pkg/state/pretty"
"gvisor.dev/gvisor/pkg/state/statefile"
"gvisor.dev/gvisor/runsc/flag"
)
// Statefile implements subcommands.Command for the "statefile" command.
type Statefile struct {
list bool
get string
key string
output string
html bool
}
// Name implements subcommands.Command.
func (*Statefile) Name() string {
return "state"
}
// Synopsis implements subcommands.Command.
func (*Statefile) Synopsis() string {
return "shows information about a statefile"
}
// Usage implements subcommands.Command.
func (*Statefile) Usage() string {
return `statefile [flags] <statefile>`
}
// SetFlags implements subcommands.Command.
func (s *Statefile) SetFlags(f *flag.FlagSet) {
f.BoolVar(&s.list, "list", false, "lists the metdata in the statefile.")
f.StringVar(&s.get, "get", "", "extracts the given metadata key.")
f.StringVar(&s.key, "key", "", "the integrity key for the file.")
f.StringVar(&s.output, "output", "", "target to write the result.")
f.BoolVar(&s.html, "html", false, "outputs in HTML format.")
}
// Execute implements subcommands.Command.Execute.
func (s *Statefile) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
// Check arguments.
if s.list && s.get != "" {
Fatalf("error: can't specify -list and -get simultaneously.")
}
// Setup output.
var output = os.Stdout // Default.
if s.output != "" {
f, err := os.OpenFile(s.output, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
if err != nil {
Fatalf("error opening output: %v", err)
}
defer func() {
if err := f.Close(); err != nil {
Fatalf("error flushing output: %v", err)
}
}()
output = f
}
// Open the file.
if f.NArg() != 1 {
f.Usage()
return subcommands.ExitUsageError
}
input, err := os.Open(f.Arg(0))
if err != nil {
Fatalf("error opening input: %v\n", err)
}
if s.html {
fmt.Fprintf(output, "<html><body>\n")
defer fmt.Fprintf(output, "</body></html>\n")
}
// Dump the full file?
if !s.list && s.get == "" {
var key []byte
if s.key != "" {
key = []byte(s.key)
}
rc, _, err := statefile.NewReader(input, key)
if err != nil {
Fatalf("error parsing statefile: %v", err)
}
if s.html {
if err := pretty.PrintHTML(output, rc); err != nil {
Fatalf("error printing state: %v", err)
}
} else {
if err := pretty.PrintText(output, rc); err != nil {
Fatalf("error printing state: %v", err)
}
}
return subcommands.ExitSuccess
}
// Load just the metadata.
metadata, err := statefile.MetadataUnsafe(input)
if err != nil {
Fatalf("error reading metadata: %v", err)
}
// Is it a single key?
if s.get != "" {
val, ok := metadata[s.get]
if !ok {
Fatalf("metadata key %s: not found", s.get)
}
fmt.Fprintf(output, "%s\n", val)
return subcommands.ExitSuccess
}
// List all keys.
if s.html {
fmt.Fprintf(output, " <ul>\n")
defer fmt.Fprintf(output, " </ul>\n")
}
for key := range metadata {
if s.html {
fmt.Fprintf(output, " <li>%s</li>\n", key)
} else {
fmt.Fprintf(output, "%s\n", key)
}
}
return subcommands.ExitSuccess
}
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