forked from aptly-dev/aptly
/
deb.go
99 lines (84 loc) · 1.96 KB
/
deb.go
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package deb
import (
"archive/tar"
"bufio"
"compress/gzip"
"fmt"
"github.com/mkrautz/goar"
"github.com/smira/aptly/utils"
"io"
"os"
"strings"
)
// GetControlFileFromDeb reads control file from deb package
func GetControlFileFromDeb(packageFile string) (Stanza, error) {
file, err := os.Open(packageFile)
if err != nil {
return nil, err
}
defer file.Close()
library := ar.NewReader(file)
for {
header, err := library.Next()
if err == io.EOF {
return nil, fmt.Errorf("unable to find control.tar.gz part")
}
if err != nil {
return nil, fmt.Errorf("unable to read .deb archive: %s", err)
}
if header.Name == "control.tar.gz" {
ungzip, err := gzip.NewReader(library)
if err != nil {
return nil, fmt.Errorf("unable to ungzip: %s", err)
}
defer ungzip.Close()
untar := tar.NewReader(ungzip)
for {
tarHeader, err := untar.Next()
if err == io.EOF {
return nil, fmt.Errorf("unable to find control file")
}
if err != nil {
return nil, fmt.Errorf("unable to read .tar archive: %s", err)
}
if tarHeader.Name == "./control" || tarHeader.Name == "control" {
reader := NewControlFileReader(untar)
stanza, err := reader.ReadStanza()
if err != nil {
return nil, err
}
return stanza, nil
}
}
}
}
}
// GetControlFileFromDsc reads control file from dsc package
func GetControlFileFromDsc(dscFile string, verifier utils.Verifier) (Stanza, error) {
file, err := os.Open(dscFile)
if err != nil {
return nil, err
}
defer file.Close()
line, err := bufio.NewReader(file).ReadString('\n')
if err != nil {
return nil, err
}
file.Seek(0, 0)
var text *os.File
if strings.Index(line, "BEGIN PGP SIGN") != -1 {
text, err = verifier.ExtractClearsigned(file)
if err != nil {
return nil, err
}
defer text.Close()
} else {
text = file
}
reader := NewControlFileReader(text)
stanza, err := reader.ReadStanza()
if err != nil {
return nil, err
}
return stanza, nil
}