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iso_config.go
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iso_config.go
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package common
import (
"bufio"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"github.com/mitchellh/packer/template/interpolate"
)
// ISOConfig contains configuration for downloading ISO images.
type ISOConfig struct {
ISOChecksum string `mapstructure:"iso_checksum"`
ISOChecksumURL string `mapstructure:"iso_checksum_url"`
ISOChecksumType string `mapstructure:"iso_checksum_type"`
ISOUrls []string `mapstructure:"iso_urls"`
TargetPath string `mapstructure:"iso_target_path"`
RawSingleISOUrl string `mapstructure:"iso_url"`
}
func (c *ISOConfig) Prepare(ctx *interpolate.Context) ([]string, []error) {
// Validation
var errs []error
var err error
var warnings []string
if c.RawSingleISOUrl == "" && len(c.ISOUrls) == 0 {
errs = append(
errs, errors.New("One of iso_url or iso_urls must be specified."))
} else if c.RawSingleISOUrl != "" && len(c.ISOUrls) > 0 {
errs = append(
errs, errors.New("Only one of iso_url or iso_urls may be specified."))
} else if c.RawSingleISOUrl != "" {
c.ISOUrls = []string{c.RawSingleISOUrl}
}
if c.ISOChecksumType == "" {
errs = append(
errs, errors.New("The iso_checksum_type must be specified."))
} else {
c.ISOChecksumType = strings.ToLower(c.ISOChecksumType)
if c.ISOChecksumType != "none" {
if c.ISOChecksum == "" && c.ISOChecksumURL == "" {
errs = append(
errs, errors.New("Due to large file sizes, an iso_checksum is required"))
return warnings, errs
} else {
if h := HashForType(c.ISOChecksumType); h == nil {
errs = append(
errs, fmt.Errorf("Unsupported checksum type: %s", c.ISOChecksumType))
return warnings, errs
}
// If iso_checksum has no value use iso_checksum_url instead.
if c.ISOChecksum == "" {
u, err := url.Parse(c.ISOChecksumURL)
if err != nil {
errs = append(errs,
fmt.Errorf("Error parsing checksum: %s", err))
return warnings, errs
}
switch u.Scheme {
case "http", "https":
res, err := http.Get(c.ISOChecksumURL)
c.ISOChecksum = ""
if err != nil {
errs = append(errs,
fmt.Errorf("Error getting checksum from url: %s", c.ISOChecksumURL))
return warnings, errs
}
defer res.Body.Close()
err = c.parseCheckSumFile(bufio.NewReader(res.Body))
if err != nil {
errs = append(errs, err)
return warnings, errs
}
case "file":
file, err := os.Open(u.Path)
if err != nil {
errs = append(errs, err)
return warnings, errs
}
err = c.parseCheckSumFile(bufio.NewReader(file))
if err != nil {
errs = append(errs, err)
return warnings, errs
}
case "":
break
default:
errs = append(errs,
fmt.Errorf("Error parsing checksum url: %s, scheme not supported: %s", c.ISOChecksumURL, u.Scheme))
return warnings, errs
}
}
}
}
}
c.ISOChecksum = strings.ToLower(c.ISOChecksum)
for i, url := range c.ISOUrls {
c.ISOUrls[i], err = DownloadableURL(url)
if err != nil {
errs = append(
errs, fmt.Errorf("Failed to parse iso_url %d: %s", i+1, err))
}
}
// Warnings
if c.ISOChecksumType == "none" {
warnings = append(warnings,
"A checksum type of 'none' was specified. Since ISO files are so big,\n"+
"a checksum is highly recommended.")
}
return warnings, errs
}
func (c *ISOConfig) parseCheckSumFile(rd *bufio.Reader) error {
for {
line, err := rd.ReadString('\n')
if err != nil {
if err == io.EOF {
return fmt.Errorf("No checksum for \"%s\" found at: %s", filepath.Base(c.ISOUrls[0]), c.ISOChecksumURL)
} else {
return fmt.Errorf("Error getting checksum from url: %s , %s", c.ISOChecksumURL, err.Error())
}
}
parts := strings.Fields(line)
if len(parts) < 2 {
continue
}
if strings.ToLower(parts[0]) == c.ISOChecksumType {
// BSD-style checksum
if parts[1] == fmt.Sprintf("(%s)", filepath.Base(c.ISOUrls[0])) {
c.ISOChecksum = parts[3]
break
}
} else {
// Standard checksum
if parts[1][0] == '*' {
// Binary mode
parts[1] = parts[1][1:]
}
if parts[1] == filepath.Base(c.ISOUrls[0]) {
c.ISOChecksum = parts[0]
break
}
}
}
return nil
}