github.com/makyo/juju@v0.0.0-20160425123129-2608902037e9/cmd/plugins/juju-metadata/signmetadata.go (about)

     1  // Copyright 2013 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package main
     5  
     6  import (
     7  	"fmt"
     8  	"io/ioutil"
     9  	"os"
    10  	"path/filepath"
    11  	"strings"
    12  
    13  	"github.com/juju/cmd"
    14  	"github.com/juju/loggo"
    15  	"launchpad.net/gnuflag"
    16  
    17  	"github.com/juju/juju/environs/simplestreams"
    18  )
    19  
    20  func newSignMetadataCommand() cmd.Command {
    21  	return &signMetadataCommand{}
    22  }
    23  
    24  var signMetadataDoc = `
    25  sign searches for json files in the specified directory tree and inline signs
    26  them using the private key in the specified keyring file. For each .json file, a
    27  corresponding .sjson file is procduced.
    28  
    29  The specified keyring file is expected to contain an amored private key. If the key
    30  is encrypted, then the specified passphrase is used to decrypt the key.
    31  `
    32  
    33  // signMetadataCommand is used to sign simplestreams metadata json files.
    34  type signMetadataCommand struct {
    35  	cmd.CommandBase
    36  	dir        string
    37  	keyFile    string
    38  	passphrase string
    39  }
    40  
    41  func (c *signMetadataCommand) Info() *cmd.Info {
    42  	return &cmd.Info{
    43  		Name:    "sign",
    44  		Purpose: "sign simplestreams metadata",
    45  		Doc:     signMetadataDoc,
    46  	}
    47  }
    48  
    49  func (c *signMetadataCommand) SetFlags(f *gnuflag.FlagSet) {
    50  	c.CommandBase.SetFlags(f)
    51  	f.StringVar(&c.dir, "d", "", "directory in which to look for metadata")
    52  	f.StringVar(&c.keyFile, "k", "", "file containing the amored private signing key")
    53  	f.StringVar(&c.passphrase, "p", "", "passphrase used to decrypt the private key")
    54  }
    55  
    56  func (c *signMetadataCommand) Init(args []string) error {
    57  	if c.dir == "" {
    58  		return fmt.Errorf("directory must be specified")
    59  	}
    60  	if c.keyFile == "" {
    61  		return fmt.Errorf("keyfile must be specified")
    62  	}
    63  	return cmd.CheckEmpty(args)
    64  }
    65  
    66  func (c *signMetadataCommand) Run(context *cmd.Context) error {
    67  	loggo.RegisterWriter("signmetadata", cmd.NewCommandLogWriter("juju.plugins.metadata", context.Stdout, context.Stderr), loggo.INFO)
    68  	defer loggo.RemoveWriter("signmetadata")
    69  	keyData, err := ioutil.ReadFile(c.keyFile)
    70  	if err != nil {
    71  		return err
    72  	}
    73  	dir := context.AbsPath(c.dir)
    74  	return process(dir, string(keyData), c.passphrase)
    75  }
    76  
    77  func process(dir, key, passphrase string) error {
    78  	logger.Debugf("processing directory %q", dir)
    79  	// Do any json files in dir
    80  	filenames, err := filepath.Glob(filepath.Join(dir, "*"+simplestreams.UnsignedSuffix))
    81  	if len(filenames) > 0 {
    82  		logger.Infof("signing %d file(s) in %q", len(filenames), dir)
    83  	}
    84  	for _, filename := range filenames {
    85  		logger.Infof("signing file %q", filename)
    86  		f, err := os.Open(filename)
    87  		if err != nil {
    88  			return fmt.Errorf("opening file %q: %v", filename, err)
    89  		}
    90  		encoded, err := simplestreams.Encode(f, key, passphrase)
    91  		if err != nil {
    92  			return fmt.Errorf("encoding file %q: %v", filename, err)
    93  		}
    94  		signedFilename := strings.Replace(filename, simplestreams.UnsignedSuffix, simplestreams.SignedSuffix, -1)
    95  		if err = ioutil.WriteFile(signedFilename, encoded, 0644); err != nil {
    96  			return fmt.Errorf("writing signed file %q: %v", signedFilename, err)
    97  		}
    98  	}
    99  	// Now process any directories in dir.
   100  	files, err := ioutil.ReadDir(dir)
   101  	if err != nil {
   102  		return err
   103  	}
   104  	for _, f := range files {
   105  		if f.IsDir() {
   106  			if err = process(filepath.Join(dir, f.Name()), key, passphrase); err != nil {
   107  				return err
   108  			}
   109  		}
   110  	}
   111  	return nil
   112  }