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// Copyright 2018 Northern.tech AS
//
// 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 main
import (
"fmt"
"io"
"os"
"regexp"
"github.com/urfave/cli"
)
var isimg = regexp.MustCompile(`\.(mender|sdimg|uefiimg)`)
func Cat(c *cli.Context) (err error) {
if c.NArg() != 1 {
return cli.NewExitError(fmt.Sprintf("Got %d arguments, wants one", c.NArg()), 1)
}
if !isimg.MatchString(c.Args().First()) {
return cli.NewExitError("The input image does not seem to be a valid image", 1)
}
r, err := NewPartitionFile(c.Args().First(), c.String("key"))
if err != nil {
return cli.NewExitError(fmt.Sprintf("failed to open the partition reader: err: %v", err), 1)
}
var w io.WriteCloser = os.Stdout
if _, err = io.Copy(w, r); err != nil {
return cli.NewExitError(fmt.Sprintf("failed to copy from: %s to stdout: err: %v", c.Args().First(), err), 1)
}
return r.Close()
}
func Copy(c *cli.Context) (err error) {
var r io.ReadCloser
var w io.WriteCloser
switch parseCLIOptions(c) {
case copyin:
r, err = os.OpenFile(c.Args().First(), os.O_CREATE|os.O_RDONLY, 0655)
defer r.Close()
if err != nil {
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
w, err = NewPartitionFile(c.Args().Get(1), c.String("key"))
if err != nil {
w.Close()
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
case copyinstdin:
r = os.Stdin
w, err = NewPartitionFile(c.Args().First(), c.String("key"))
if err != nil {
w.Close()
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
case copyout:
r, err = NewPartitionFile(c.Args().First(), c.String("key"))
defer r.Close()
if err != nil {
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
w, err = os.OpenFile(c.Args().Get(1), os.O_CREATE|os.O_WRONLY, 0655)
if err != nil {
w.Close()
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
case parseError:
return cli.NewExitError(fmt.Sprintln("no artifact or sdimage provided"), 1)
case argerror:
return cli.NewExitError(fmt.Sprintf("got %d arguments, wants two", c.NArg()), 1)
default:
return cli.NewExitError("critical error", 1)
}
_, err = io.Copy(w, r)
// Ignore the close error in case of an io.Copy error.
if cerr := w.Close(); cerr != nil && err != nil {
err = cerr
}
return err
}
// Install installs a file from the host filesystem onto either
// a mender artifact, or an sdimg.
func Install(c *cli.Context) (err error) {
var r io.ReadCloser
var w io.WriteCloser
switch parseCLIOptions(c) {
case copyin:
var perm os.FileMode
if c.Int("mode") == 0 {
return cli.NewExitError("File permissions needs to be set, if you are simply copying, the cp command should fit your needs", 1)
}
perm = os.FileMode(c.Int("mode"))
r, err = os.OpenFile(c.Args().First(), os.O_RDWR, perm)
defer r.Close()
if err != nil {
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
w, err = NewPartitionFile(c.Args().Get(1), c.String("key"))
defer w.Close()
if err != nil {
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
if _, err = io.Copy(w, r); err != nil {
return cli.NewExitError(fmt.Sprintf("%v", err), 1)
}
return nil
case parseError:
return cli.NewExitError("No artifact or sdimg provided", 1)
case argerror:
return cli.NewExitError(fmt.Sprintf("got %d arguments, wants two", c.NArg()), 1)
default:
return cli.NewExitError("Unrecognized parse error", 1)
}
}
// enumerate cli-options
const (
copyin = iota
copyinstdin
copyout
parseError
argerror
criterror
)
func parseCLIOptions(c *cli.Context) int {
finfo, err := os.Stdin.Stat()
if err != nil {
return criterror
}
// no data on stdin
if finfo.Mode()&os.ModeNamedPipe == 0 {
if c.NArg() != 2 {
return argerror
}
switch {
case isimg.MatchString(c.Args().First()):
return copyout
case isimg.MatchString(c.Args().Get(1)):
return copyin
default:
return parseError
}
} else {
// data on stdin
if isimg.MatchString(c.Args().First()) {
return copyinstdin
}
return parseError
}
}
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