packer-cn/post-processor/compress/post-processor.go

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package compress
import (
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"archive/tar"
"archive/zip"
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"compress/gzip"
"fmt"
"io"
"os"
"path/filepath"
"regexp"
"runtime"
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"github.com/klauspost/pgzip"
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"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/helper/config"
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"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/template/interpolate"
"github.com/pierrec/lz4"
)
type Config struct {
common.PackerConfig `mapstructure:",squash"`
// Fields from config file
OutputPath string `mapstructure:"output"`
CompressionLevel int `mapstructure:"compression_level"`
KeepInputArtifact bool `mapstructure:"keep_input_artifact"`
// Derived fields
Archive string
Algorithm string
ctx *interpolate.Context
}
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type PostProcessor struct {
config *Config
}
var (
// ErrInvalidCompressionLevel is returned when the compression level passed
// to gzip is not in the expected range. See compress/flate for details.
ErrInvalidCompressionLevel = fmt.Errorf(
"Invalid compression level. Expected an integer from -1 to 9.")
ErrWrongInputCount = fmt.Errorf(
"Can only have 1 input file when not using tar/zip")
filenamePattern = regexp.MustCompile(`(?:\.([a-z0-9]+))`)
)
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func (p *PostProcessor) Configure(raws ...interface{}) error {
err := config.Decode(&p.config, &config.DecodeOpts{
Interpolate: true,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{},
},
}, raws...)
errs := new(packer.MultiError)
// If there is no explicit number of Go threads to use, then set it
if os.Getenv("GOMAXPROCS") == "" {
runtime.GOMAXPROCS(runtime.NumCPU())
}
if p.config.OutputPath == "" {
p.config.OutputPath = "packer_{{.BuildName}}_{{.Provider}}"
}
if err = interpolate.Validate(p.config.OutputPath, p.config.ctx); err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error parsing target template: %s", err))
}
templates := map[string]*string{
"output": &p.config.OutputPath,
}
if p.config.CompressionLevel > pgzip.BestCompression {
p.config.CompressionLevel = pgzip.BestCompression
}
// Technically 0 means "don't compress" but I don't know how to
// differentiate between "user entered zero" and "user entered nothing".
// Also, why bother creating a compressed file with zero compression?
if p.config.CompressionLevel == -1 || p.config.CompressionLevel == 0 {
p.config.CompressionLevel = pgzip.DefaultCompression
}
for key, ptr := range templates {
if *ptr == "" {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("%s must be set", key))
}
*ptr, err = interpolate.Render(p.config.OutputPath, p.config.ctx)
if err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error processing %s: %s", key, err))
}
}
p.config.detectFromFilename()
if len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
target := p.config.OutputPath
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keep := p.config.KeepInputArtifact
newArtifact := &Artifact{Path: target}
outputFile, err := os.Create(target)
if err != nil {
return nil, false, fmt.Errorf(
"Unable to create archive %s: %s", target, err)
}
defer outputFile.Close()
// Setup output interface. If we're using compression, output is a
// compression writer. Otherwise it's just a file.
var output io.WriteCloser
switch p.config.Algorithm {
case "lz4":
ui.Say(fmt.Sprintf("Using lz4 compression with %d cores for %s",
runtime.GOMAXPROCS(-1), target))
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output, err = makeLZ4Writer(outputFile, p.config.CompressionLevel)
defer output.Close()
case "pgzip":
ui.Say(fmt.Sprintf("Using pgzip compression with %d cores for %s",
runtime.GOMAXPROCS(-1), target))
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output, err = makePgzipWriter(outputFile, p.config.CompressionLevel)
defer output.Close()
default:
output = outputFile
}
compression := p.config.Algorithm
if compression == "" {
compression = "no compression"
}
// Build an archive, if we're supposed to do that.
switch p.config.Archive {
case "tar":
ui.Say(fmt.Sprintf("Tarring %s with %s", target, compression))
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err = createTarArchive(artifact.Files(), output)
if err != nil {
return nil, keep, fmt.Errorf("Error creating tar: %s", err)
}
case "zip":
ui.Say(fmt.Sprintf("Zipping %s", target))
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err = createZipArchive(artifact.Files(), output)
if err != nil {
return nil, keep, fmt.Errorf("Error creating zip: %s", err)
}
default:
// Filename indicates no tarball (just compress) so we'll do an io.Copy
// into our compressor.
if len(artifact.Files()) != 1 {
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return nil, keep, fmt.Errorf(
"Can only have 1 input file when not using tar/zip. Found %d "+
"files: %v", len(artifact.Files()), artifact.Files())
}
archiveFile := artifact.Files()[0]
ui.Say(fmt.Sprintf("Archiving %s with %s", archiveFile, compression))
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source, err := os.Open(archiveFile)
if err != nil {
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return nil, keep, fmt.Errorf(
"Failed to open source file %s for reading: %s",
archiveFile, err)
}
defer source.Close()
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if _, err = io.Copy(output, source); err != nil {
return nil, keep, fmt.Errorf("Failed to compress %s: %s",
archiveFile, err)
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}
}
ui.Say(fmt.Sprintf("Archive %s completed", target))
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return newArtifact, keep, nil
}
func (config *Config) detectFromFilename() {
extensions := map[string]string{
"tar": "tar",
"zip": "zip",
"gz": "pgzip",
"lz4": "lz4",
}
result := filenamePattern.FindAllStringSubmatch(config.OutputPath, -1)
// No dots. Bail out with defaults.
if len(result) == 0 {
config.Algorithm = "pgzip"
config.Archive = "tar"
return
}
// Parse the last two .groups, if they're there
lastItem := result[len(result)-1][1]
var nextToLastItem string
if len(result) == 1 {
nextToLastItem = ""
} else {
nextToLastItem = result[len(result)-2][1]
}
// Should we make an archive? E.g. tar or zip?
if nextToLastItem == "tar" {
config.Archive = "tar"
}
if lastItem == "zip" || lastItem == "tar" {
config.Archive = lastItem
// Tar or zip is our final artifact. Bail out.
return
}
// Should we compress the artifact?
algorithm, ok := extensions[lastItem]
if ok {
config.Algorithm = algorithm
// We found our compression algorithm. Bail out.
return
}
// We didn't match a known compression format. Default to tar + pgzip
config.Algorithm = "pgzip"
config.Archive = "tar"
return
}
func makeLZ4Writer(output io.WriteCloser, compressionLevel int) (io.WriteCloser, error) {
lzwriter := lz4.NewWriter(output)
if compressionLevel > gzip.DefaultCompression {
lzwriter.Header.HighCompression = true
}
return lzwriter, nil
}
func makePgzipWriter(output io.WriteCloser, compressionLevel int) (io.WriteCloser, error) {
gzipWriter, err := pgzip.NewWriterLevel(output, compressionLevel)
if err != nil {
return nil, ErrInvalidCompressionLevel
}
gzipWriter.SetConcurrency(500000, runtime.GOMAXPROCS(-1))
return gzipWriter, nil
}
func createTarArchive(files []string, output io.WriteCloser) error {
archive := tar.NewWriter(output)
defer archive.Close()
for _, path := range files {
file, err := os.Open(path)
if err != nil {
return fmt.Errorf("Unable to read file %s: %s", path, err)
}
defer file.Close()
fi, err := file.Stat()
if err != nil {
return fmt.Errorf("Unable to get fileinfo for %s: %s", path, err)
}
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header, err := tar.FileInfoHeader(fi, path)
if err != nil {
return fmt.Errorf("Failed to create tar header for %s: %s", path, err)
}
if err := archive.WriteHeader(header); err != nil {
return fmt.Errorf("Failed to write tar header for %s: %s", path, err)
}
if _, err := io.Copy(archive, file); err != nil {
return fmt.Errorf("Failed to copy %s data to archive: %s", path, err)
}
}
return nil
}
func createZipArchive(files []string, output io.WriteCloser) error {
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archive := zip.NewWriter(output)
defer archive.Close()
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for _, path := range files {
path = filepath.ToSlash(path)
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source, err := os.Open(path)
if err != nil {
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return fmt.Errorf("Unable to read file %s: %s", path, err)
}
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defer source.Close()
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target, err := archive.Create(path)
if err != nil {
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return fmt.Errorf("Failed to add zip header for %s: %s", path, err)
}
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_, err = io.Copy(target, source)
if err != nil {
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return fmt.Errorf("Failed to copy %s data to archive: %s", path, err)
}
}
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return nil
}