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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package signdeb
import (
"archive/tar"
"bufio"
"bytes"
"compress/bzip2"
"compress/gzip"
"errors"
"io"
"io/ioutil"
"path"
"strings"
"github.com/xi2/xz"
)
type PackageInfo struct {
Package, Version, Arch string
}
// Parse basic package info from a control.tar.gz stream
func parseControl(r io.Reader, ext string) (*PackageInfo, error) {
var err error
switch ext {
case ".gz":
r, err = gzip.NewReader(r)
case ".bz2":
r = bzip2.NewReader(r)
case ".xz":
r, err = xz.NewReader(r, 0)
case "":
default:
err = errors.New("unrecognized compression on control.tar")
}
if err != nil {
return nil, err
}
tr := tar.NewReader(r)
found := false
for {
hdr, err := tr.Next()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
if path.Clean(hdr.Name) == "control" {
found = true
break
}
}
if !found {
return nil, errors.New("control.tar has no control file")
}
blob, err := ioutil.ReadAll(tr)
if err != nil {
return nil, err
}
info := new(PackageInfo)
scanner := bufio.NewScanner(bytes.NewReader(blob))
for scanner.Scan() {
line := scanner.Text()
i := strings.IndexAny(line, " \t\r\n")
j := strings.Index(line, ":")
if j < 0 || i < j {
continue
}
key := line[:j]
value := strings.Trim(line[j+1:], " \t\r\n")
switch strings.ToLower(key) {
case "package":
info.Package = value
case "version":
info.Version = value
case "architecture":
info.Arch = value
}
}
if scanner.Err() != nil {
return nil, scanner.Err()
}
if info.Package == "" || info.Version == "" {
return nil, errors.New("control file is missing package and/or version fields")
}
return info, nil
}
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