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analysis_generator.go
143 lines (114 loc) · 3.11 KB
/
analysis_generator.go
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package analyzer
import (
"archive/tar"
"compress/gzip"
"fmt"
"io"
"os"
"strings"
"time"
"github.com/dpb587/boshua/analysis"
filescommonresult "github.com/dpb587/boshua/analysis/analyzer/filescommon.v1/result"
"github.com/dpb587/boshua/releaseversion/analyzers/releaseartifactfiles.v1/result"
"github.com/dpb587/boshua/util/checksum"
"github.com/dpb587/boshua/util/checksum/algorithm"
"github.com/pkg/errors"
)
type analysisGenerator struct {
tarball string
}
var _ analysis.AnalysisGenerator = &analysisGenerator{}
func NewAnalysis(tarball string) analysis.AnalysisGenerator {
return &analysisGenerator{
tarball: tarball,
}
}
func (a *analysisGenerator) Analyze(records analysis.Writer) error {
fh, err := os.Open(a.tarball)
if err != nil {
return errors.Wrap(err, "opening file")
}
defer fh.Close()
gzReader, err := gzip.NewReader(fh)
if err != nil {
return errors.Wrap(err, "starting gzip")
}
tarReader := tar.NewReader(gzReader)
for {
header, err := tarReader.Next()
if err == io.EOF {
break
} else if err != nil {
return errors.Wrap(err, "advancing tar")
} else if header.Typeflag == tar.TypeDir {
continue
}
path := strings.TrimPrefix(header.Name, "./")
if !strings.HasSuffix(path, ".tgz") {
continue
}
err = a.analyzeArtifact(records, path, tarReader)
if err != nil {
return fmt.Errorf("analyzing artifact %s: %v", path, err)
}
}
return nil
}
func (a *analysisGenerator) analyzeArtifact(records analysis.Writer, artifact string, reader io.Reader) error {
gzReader, err := gzip.NewReader(reader)
if err != nil {
return errors.Wrap(err, "starting gzip")
}
tarReader := tar.NewReader(gzReader)
for {
header, err := tarReader.Next()
if err == io.EOF {
break
} else if err != nil {
return errors.Wrap(err, "advancing tar")
} else if header.Typeflag == tar.TypeDir {
continue
}
path := strings.TrimPrefix(header.Name, "./")
filestat := filescommonresult.Record{
Type: string(header.Typeflag),
Path: path,
Link: header.Linkname,
Size: header.Size,
Mode: header.Mode,
Uid: int64(header.Uid),
Gid: int64(header.Gid),
Uname: header.Uname,
Gname: header.Gname,
ModTime: header.ModTime,
}
unknownTime := time.Time{}
if header.Format == tar.FormatPAX || header.Format == tar.FormatGNU {
if header.ChangeTime != unknownTime {
filestat.ChangeTime = &header.ChangeTime
}
if header.AccessTime != unknownTime {
filestat.AccessTime = &header.AccessTime
}
}
checksums := checksum.WritableChecksums{
checksum.New(algorithm.MustLookupName(algorithm.MD5)),
checksum.New(algorithm.MustLookupName(algorithm.SHA1)),
checksum.New(algorithm.MustLookupName(algorithm.SHA256)),
checksum.New(algorithm.MustLookupName(algorithm.SHA512)),
}
_, err = io.Copy(checksums, tarReader)
if err != nil {
return errors.Wrap(err, "creating checksum")
}
filestat.Checksums = checksums.ImmutableChecksums()
err = records.Write(result.Record{
Artifact: artifact,
Result: filestat,
})
if err != nil {
return errors.Wrap(err, "writing result")
}
}
return nil
}