forked from sassoftware/go-rpmutils
/
rpmutils.go
220 lines (190 loc) · 4.95 KB
/
rpmutils.go
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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 rpmutils
import (
"encoding/binary"
"errors"
"fmt"
"io"
"github.com/sassoftware/go-rpmutils/cpio"
)
type Rpm struct {
Header *RpmHeader
f io.Reader
}
type RpmHeader struct {
lead []byte
sigHeader *rpmHeader
genHeader *rpmHeader
isSource bool
}
func ReadRpm(f io.Reader) (*Rpm, error) {
hdr, err := ReadHeader(f)
if err != nil {
return nil, err
}
return &Rpm{
Header: hdr,
f: f,
}, nil
}
func (rpm *Rpm) ExpandPayload(dest string) error {
pld, err := uncompressRpmPayloadReader(rpm.f, rpm.Header)
if err != nil {
return err
}
return cpio.Extract(pld, dest)
}
func (rpm *Rpm) PayloadReader() (*cpio.Reader, error) {
pld, err := uncompressRpmPayloadReader(rpm.f, rpm.Header)
if err != nil {
return nil, err
}
return cpio.NewReader(pld), nil
}
func (rpm *Rpm) PayloadReaderExtended() (PayloadReader, error) {
pld, err := uncompressRpmPayloadReader(rpm.f, rpm.Header)
if err != nil {
return nil, err
}
files, err := rpm.Header.GetFiles()
if err != nil {
return nil, err
}
return newPayloadReader(pld, files), nil
}
func ReadHeader(f io.Reader) (*RpmHeader, error) {
lead, sigHeader, err := readSignatureHeader(f)
if err != nil {
return nil, err
}
sha1 := "" // need to read this from the sig header.
genHeader, err := readHeader(f, sha1, sigHeader.isSource, false)
if err != nil {
return nil, err
}
return &RpmHeader{
lead: lead,
sigHeader: sigHeader,
genHeader: genHeader,
isSource: sigHeader.isSource,
}, nil
}
func readSignatureHeader(f io.Reader) ([]byte, *rpmHeader, error) {
// Read signature header
lead, err := readExact(f, 96)
if err != nil {
return nil, nil, fmt.Errorf("error reading RPM lead: %s", err.Error())
}
// Check file magic
magic := binary.BigEndian.Uint32(lead[0:4])
if magic&0xffffffff != 0xedabeedb {
return nil, nil, fmt.Errorf("file is not an RPM")
}
// Check source flag
isSource := binary.BigEndian.Uint16(lead[6:8]) == 1
// Return signature header
hdr, err := readHeader(f, "", isSource, true)
return lead, hdr, err
}
func (hdr *RpmHeader) HasTag(tag int) bool {
h, t := hdr.getHeader(tag)
return h.HasTag(t)
}
func (hdr *RpmHeader) Get(tag int) (interface{}, error) {
h, t := hdr.getHeader(tag)
return h.Get(t)
}
func (hdr *RpmHeader) GetString(tag int) (string, error) {
vals, err := hdr.GetStrings(tag)
if err != nil {
return "", err
}
if len(vals) != 1 {
return "", fmt.Errorf("incorrect number of values")
}
return vals[0], nil
}
func (hdr *RpmHeader) GetStrings(tag int) ([]string, error) {
h, t := hdr.getHeader(tag)
return h.GetStrings(t)
}
func (hdr *RpmHeader) GetInt(tag int) (int, error) {
vals, err := hdr.GetInts(tag)
if err != nil {
return -1, err
}
if len(vals) != 1 {
return -1, fmt.Errorf("incorrect number of values")
}
return vals[0], nil
}
func (hdr *RpmHeader) GetInts(tag int) ([]int, error) {
h, t := hdr.getHeader(tag)
return h.GetInts(t)
}
func (hdr *RpmHeader) GetUint64Fallback(intTag, longTag int) (uint64, error) {
h, t := hdr.getHeader(longTag)
vals, err := h.GetUint64s(t)
if err == nil && len(vals) == 1 {
return vals[0], nil
}
h, t = hdr.getHeader(intTag)
vals, err = h.GetUint64s(t)
if err != nil {
return 0, err
} else if len(vals) != 1 {
return 0, errors.New("incorrect number of values")
}
return vals[0], nil
}
func (hdr *RpmHeader) GetBytes(tag int) ([]byte, error) {
h, t := hdr.getHeader(tag)
return h.GetBytes(t)
}
func (hdr *RpmHeader) getHeader(tag int) (*rpmHeader, int) {
if tag > _SIGHEADER_TAG_BASE {
return hdr.sigHeader, tag - _SIGHEADER_TAG_BASE
}
if tag < _GENERAL_TAG_BASE {
return hdr.sigHeader, tag
}
return hdr.genHeader, tag
}
func (hdr *RpmHeader) GetNEVRA() (*NEVRA, error) {
return hdr.genHeader.GetNEVRA()
}
func (hdr *RpmHeader) GetFiles() ([]FileInfo, error) {
return hdr.genHeader.GetFiles()
}
// Return the approximate disk space needed to install the package
func (hdr *RpmHeader) InstalledSize() (int64, error) {
u, err := hdr.GetUint64Fallback(SIZE, LONGSIZE)
if err != nil {
return -1, err
}
return int64(u), nil
}
// Return the size of the uncompressed payload in bytes
func (hdr *RpmHeader) PayloadSize() (int64, error) {
u, err := hdr.sigHeader.GetUint64Fallback(SIG_PAYLOADSIZE-_SIGHEADER_TAG_BASE, SIG_LONGARCHIVESIZE)
if err != nil {
return -1, err
} else if len(u) != 1 {
return -1, errors.New("incorrect number of values")
}
return int64(u[0]), err
}