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releasefile.go
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releasefile.go
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package dpkg
import (
"fmt"
"io"
"io/ioutil"
"path"
"sort"
"strconv"
"strings"
"time"
)
const (
tCONTENTS = iota
tCONTROLFILES
)
type IndicesFile struct {
Path string
Url string
CachePath string
Architecture string
Type string
Hash string
}
type PackagesFileInfo struct {
Size uint64
Path string
MD5 string
Architecture string
Type int
}
type ReleaseFile struct {
Date time.Time
Suite string
Description string
Components []string
Architectures Architectures
fileInfos []PackagesFileInfo
Hash string
Host string
}
func NewReleaseFile(host string, r io.Reader) (ReleaseFile, error) {
bs, err := ioutil.ReadAll(r)
if err != nil {
return ReleaseFile{}, err
}
cf, err := NewControlFile(string(bs))
if err != nil {
return ReleaseFile{}, err
}
return cf.ToReleaseFile(host)
}
// GetReleaseFile load ReleaseFile from dataDir with suite
func LoadReleaseFile(host string, path string) (ReleaseFile, error) {
bs, err := ioutil.ReadFile(path)
if err != nil {
return ReleaseFile{}, fmt.Errorf("GetReleaseFile open file error: %v", err)
}
cf, err := NewControlFile(string(bs))
if err != nil {
return ReleaseFile{}, err
}
return cf.ToReleaseFile(host)
}
func parseSuiteDate(str string) (time.Time, error) {
for _, layout := range []string{time.RFC1123, time.RFC3339} {
v, err := time.Parse(layout, str)
if err == nil {
return v, nil
}
}
return time.Time{}, fmt.Errorf("unknown the layout of date string: %q", str)
}
// ToReleaseFile build a new ReleaseFile by reading contents from r
func (cf ControlFile) ToReleaseFile(host string) (ReleaseFile, error) {
rf := ReleaseFile{
Host: host,
}
for _, arch := range cf.GetArray("architectures", " ") {
rf.Architectures = append(rf.Architectures, arch)
}
rf.Suite = cf.Get("suite")
if rf.Suite == "" {
rf.Suite = cf.Get("codename")
}
rf.Description = cf.Get("description")
var err error
rf.Date, err = parseSuiteDate(cf.Get("date"))
if err != nil {
DebugPrintf("Unknown release date: %s\n", err)
}
rf.Components = cf.GetArray("components", " ")
rf.Hash = HashBytes([]byte(cf.Raw))
var ps []PackagesFileInfo
for _, v := range cf.GetMultiline("md5sum") {
fs := getArrayString(v, " ")
if len(fs) != 3 {
DebugPrintf("Ignore:%q %+v (%d)\n", v, fs, len(fs))
continue
}
size, err := strconv.Atoi(fs[1])
if err != nil {
DebugPrintf("Components size field invalid %q\n", v)
continue
}
ps = append(ps, PackagesFileInfo{
Size: uint64(size),
Path: fs[2],
MD5: fs[0],
})
}
rf.fileInfos = ps
return rf, rf.valid()
}
func (rf ReleaseFile) valid() error {
if rf.Suite == "" {
return fmt.Errorf("NewReleaseFile input data is invalid. Without suite name")
}
if len(rf.Components) == 0 {
return fmt.Errorf("NewReleaseFile input data is invalid. Without any components")
}
if len(rf.fileInfos) == 0 {
return fmt.Errorf("NewReleaseFile input data is invalid. Without any valid fileinfos")
}
return nil
}
type PackagesFileInfos []PackagesFileInfo
func (infos PackagesFileInfos) Len() int {
return len(infos)
}
func (infos PackagesFileInfos) Less(i, j int) bool {
return infos[i].Path < infos[j].Path
}
func (infos PackagesFileInfos) Swap(i, j int) {
infos[i], infos[j] = infos[j], infos[i]
}
func (rf ReleaseFile) findComponent(raw string) (PackagesFileInfo, bool) {
found := false
var fallback PackagesFileInfo
for _, f := range rf.fileInfos {
if f.Path != raw && f.Path != raw+".gz" && f.Path != raw+".bz2" {
continue
}
found, fallback = true, f
switch strings.ToLower(path.Ext(f.Path)) {
case ".gz", ".bz2":
return f, found
}
}
return fallback, found
}
func (rf ReleaseFile) IndicesFiles(arch string, t int) []IndicesFile {
var ret []IndicesFile
for _, f := range rf.FileInfos1() {
if f.Type == t && f.Architecture == arch {
ret = append(ret, IndicesFile{
Path: f.Path,
Url: rf.Host + "/dists/" + rf.Suite + "/" + f.Path,
CachePath: path.Join(rf.Hash, f.Path),
Hash: f.MD5,
Architecture: f.Architecture,
})
}
}
return ret
}
func (rf ReleaseFile) FileInfos1() []PackagesFileInfo {
var set = make(map[string]PackagesFileInfo)
for _, component := range rf.Components {
for _, arch := range rf.Architectures {
raw := component + "/binary-" + string(arch) + "/Packages"
if p, ok := rf.findComponent(raw); ok {
p.Architecture = arch
p.Type = tCONTROLFILES
set[raw] = p
}
raw = component + "/Contents-" + string(arch)
if p, ok := rf.findComponent(raw); ok {
p.Architecture = arch
p.Type = tCONTENTS
set[raw] = p
}
}
raw := component + "/source/Sources"
if p, ok := rf.findComponent(raw); ok {
p.Architecture = "source"
p.Type = tCONTROLFILES
set[raw] = p
}
}
var r = make(PackagesFileInfos, 0)
for _, f := range set {
r = append(r, f)
}
sort.Sort(r)
return r
}