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manifest.go
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manifest.go
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package stretcher
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"fmt"
"hash"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"strings"
"gopkg.in/yaml.v1"
)
var RsyncDefaultOpts = []string{"-av", "--delete"}
var DefaultDestMode = os.FileMode(0755)
type Manifest struct {
Src string `yaml:"src"`
CheckSum string `yaml:"checksum"`
Dest string `yaml:"dest"`
DestMode *os.FileMode `yaml:"dest_mode"`
Commands Commands `yaml:"commands"`
Excludes []string `yaml:"excludes"`
ExcludeFrom string `yaml:"exclude_from"`
}
func (m *Manifest) newHash() (hash.Hash, error) {
switch len(m.CheckSum) {
case 32:
return md5.New(), nil
case 40:
return sha1.New(), nil
case 64:
return sha256.New(), nil
case 128:
return sha512.New(), nil
default:
return nil, fmt.Errorf("checksum must be md5, sha1, sha256, sha512 hex string.")
}
}
func (m *Manifest) Deploy() error {
src, err := getURL(m.Src)
if err != nil {
return fmt.Errorf("Get src failed:", err)
}
defer src.Close()
tmp, err := ioutil.TempFile(os.TempDir(), "stretcher")
if err != nil {
return err
}
defer os.Remove(tmp.Name())
written, sum, err := m.copyAndCalcHash(tmp, src)
tmp.Close()
if err != nil {
return err
}
log.Printf("Wrote %d bytes to %s", written, tmp.Name())
if len(m.CheckSum) > 0 && sum != strings.ToLower(m.CheckSum) {
return fmt.Errorf("Checksum mismatch. expected:%s got:%s", m.CheckSum, sum)
} else {
log.Printf("Checksum ok: %s", sum)
}
dir, err := ioutil.TempDir(os.TempDir(), "stretcher_src")
if err != nil {
return err
}
defer os.RemoveAll(dir)
err = m.Commands.Pre.Invoke()
if err != nil {
return err
}
cwd, _ := os.Getwd()
if err = os.Chdir(dir); err != nil {
return err
}
log.Println("Extract archive:", tmp.Name(), "to", dir)
out, err := exec.Command("tar", "xf", tmp.Name()).CombinedOutput()
if len(out) > 0 {
log.Println(string(out))
}
if err != nil {
log.Println("failed: tar xf", tmp.Name(), "failed", err)
return err
}
log.Println("Set dest mode", *m.DestMode)
err = os.Chmod(dir, *m.DestMode)
if err != nil {
return err
}
from := dir + "/"
to := m.Dest
// append "/" when not terminated by "/"
if strings.LastIndex(to, "/") != len(to)-1 {
to = to + "/"
}
args := []string{}
args = append(args, RsyncDefaultOpts...)
if m.ExcludeFrom != "" {
args = append(args, "--exclude-from", from+m.ExcludeFrom)
}
if len(m.Excludes) > 0 {
for _, ex := range m.Excludes {
args = append(args, "--exclude", ex)
}
}
args = append(args, from, to)
log.Println("rsync", args)
out, err = exec.Command("rsync", args...).CombinedOutput()
if len(out) > 0 {
log.Println(string(out))
}
if err != nil {
return err
}
if err = os.Chdir(cwd); err != nil {
return err
}
err = m.Commands.Post.Invoke()
if err != nil {
return err
}
return nil
}
func (m *Manifest) copyAndCalcHash(dst io.Writer, src io.Reader) (written int64, sum string, err error) {
h, err := m.newHash()
if err != nil {
return int64(0), "", err
}
buf := make([]byte, 32*1024)
for {
nr, er := src.Read(buf)
if nr > 0 {
io.WriteString(h, string(buf[0:nr]))
nw, ew := dst.Write(buf[0:nr])
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er == io.EOF {
break
}
if er != nil {
err = er
break
}
}
s := fmt.Sprintf("%x", h.Sum(nil))
return written, s, err
}
func ParseManifest(data []byte) (*Manifest, error) {
m := &Manifest{}
if err := yaml.Unmarshal(data, m); err != nil {
return nil, err
}
if m.Src == "" {
return nil, fmt.Errorf("Src is required")
}
if m.Dest == "" {
return nil, fmt.Errorf("Dest is required")
}
if m.DestMode == nil {
mode := DefaultDestMode
m.DestMode = &mode
}
return m, nil
}