github.com/altoros/juju-vmware@v0.0.0-20150312064031-f19ae857ccca/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  var signMetadataDoc = `
    21  sign searches for json files in the specified directory tree and inline signs
    22  them using the private key in the specified keyring file. For each .json file, a
    23  corresponding .sjson file is procduced.
    24  
    25  The specified keyring file is expected to contain an amored private key. If the key
    26  is encrypted, then the specified passphrase is used to decrypt the key.
    27  `
    28  
    29  // SignMetadataCommand is used to sign simplestreams metadata json files.
    30  type SignMetadataCommand struct {
    31  	cmd.CommandBase
    32  	dir        string
    33  	keyFile    string
    34  	passphrase string
    35  }
    36  
    37  func (c *SignMetadataCommand) Info() *cmd.Info {
    38  	return &cmd.Info{
    39  		Name:    "sign",
    40  		Purpose: "sign simplestreams metadata",
    41  		Doc:     signMetadataDoc,
    42  	}
    43  }
    44  
    45  func (c *SignMetadataCommand) SetFlags(f *gnuflag.FlagSet) {
    46  	c.CommandBase.SetFlags(f)
    47  	f.StringVar(&c.dir, "d", "", "directory in which to look for metadata")
    48  	f.StringVar(&c.keyFile, "k", "", "file containing the amored private signing key")
    49  	f.StringVar(&c.passphrase, "p", "", "passphrase used to decrypt the private key")
    50  }
    51  
    52  func (c *SignMetadataCommand) Init(args []string) error {
    53  	if c.dir == "" {
    54  		return fmt.Errorf("directory must be specified")
    55  	}
    56  	if c.keyFile == "" {
    57  		return fmt.Errorf("keyfile must be specified")
    58  	}
    59  	return cmd.CheckEmpty(args)
    60  }
    61  
    62  func (c *SignMetadataCommand) Run(context *cmd.Context) error {
    63  	loggo.RegisterWriter("signmetadata", cmd.NewCommandLogWriter("juju.plugins.metadata", context.Stdout, context.Stderr), loggo.INFO)
    64  	defer loggo.RemoveWriter("signmetadata")
    65  	keyData, err := ioutil.ReadFile(c.keyFile)
    66  	if err != nil {
    67  		return err
    68  	}
    69  	dir := context.AbsPath(c.dir)
    70  	return process(dir, string(keyData), c.passphrase)
    71  }
    72  
    73  func process(dir, key, passphrase string) error {
    74  	logger.Debugf("processing directory %q", dir)
    75  	// Do any json files in dir
    76  	filenames, err := filepath.Glob(filepath.Join(dir, "*"+simplestreams.UnsignedSuffix))
    77  	if len(filenames) > 0 {
    78  		logger.Infof("signing %d file(s) in %q", len(filenames), dir)
    79  	}
    80  	for _, filename := range filenames {
    81  		logger.Infof("signing file %q", filename)
    82  		f, err := os.Open(filename)
    83  		if err != nil {
    84  			return fmt.Errorf("opening file %q: %v", filename, err)
    85  		}
    86  		encoded, err := simplestreams.Encode(f, key, passphrase)
    87  		if err != nil {
    88  			return fmt.Errorf("encoding file %q: %v", filename, err)
    89  		}
    90  		signedFilename := strings.Replace(filename, simplestreams.UnsignedSuffix, simplestreams.SignedSuffix, -1)
    91  		if err = ioutil.WriteFile(signedFilename, encoded, 0644); err != nil {
    92  			return fmt.Errorf("writing signed file %q: %v", signedFilename, err)
    93  		}
    94  	}
    95  	// Now process any directories in dir.
    96  	files, err := ioutil.ReadDir(dir)
    97  	if err != nil {
    98  		return err
    99  	}
   100  	for _, f := range files {
   101  		if f.IsDir() {
   102  			if err = process(filepath.Join(dir, f.Name()), key, passphrase); err != nil {
   103  				return err
   104  			}
   105  		}
   106  	}
   107  	return nil
   108  }