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|
package debian
import (
"bufio"
"os"
"strings"
"go.wit.com/lib/fhelp"
"go.wit.com/lib/protobuf/zoopb"
)
// obviously a hack at this point
// read the package list file from mirrors.wit.com
func InitWitMirrors(m *zoopb.Machine) error {
m.Wit = zoopb.NewPackages()
err := scanPackageListFile(m, "/var/lib/apt/lists/mirrors.wit.com_wit_dists_sid_main_binary-amd64_Packages")
return err
}
// adds the package if the name isn't there
// if it's newer, remove the old package and use the new one
func AddIfNewer(all *zoopb.Packages, p *zoopb.Package) {
check := all.FindByName(p.Name)
if check == nil {
all.Append(p)
return
}
v1, _ := fhelp.NewDebVersion(check.Version)
v2, _ := fhelp.NewDebVersion(p.Version)
if v1.Equal(v2) {
// log.Info("do nothing", v1, v2)
return
}
if v1.LessThan(v2) {
// log.Info("removing", v1, "using", v2)
all.Delete(check)
all.Append(p)
} else {
// log.Info("keeping", v1, "got:", v2)
}
}
// breaks up the apt list file into sections
// then sends each section to be processed
// and added to zoopb.Machine.Wit
func scanPackageListFile(m *zoopb.Machine, filename string) error {
file, err := os.Open(filename)
if err != nil {
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
var debInfo string
for scanner.Scan() {
line := scanner.Text()
if line == "" {
p, namemap := parsePackageInfo(debInfo)
_ = namemap
AddIfNewer(m.Wit, p)
debInfo = ""
}
debInfo += line + "\n"
}
p, _ := parsePackageInfo(debInfo)
m.Wit.Append(p)
return nil
}
/*
func (m *Machine) addPackage(name string, version string, filename string) {
if name == "" {
return
}
// log.Info("addPackage:", name, version, filename)
var deb *DebPackage
var ok bool
deb, ok = allp[name]
if !ok {
deb = NewPackage()
deb.name.SetLabel(name)
allp[name] = deb
}
newversion := new(Version)
newversion.v = version
newversion.file = filename
deb.versions = append(deb.versions, newversion)
}
*/
// parses dpkg -s foo.deb
func parsePackageInfo(lines string) (*zoopb.Package, map[string]string) {
var name string
var version string
var filename string
var gopath string
var last string
namemap := make(map[string]string)
for _, line := range strings.Split(lines, "\n") {
if line == "" {
continue
}
if strings.HasPrefix(line, " ") {
namemap[last] += line + "\n"
// these are usually Description: lines
continue
}
if strings.HasPrefix(line, "#") {
// skip comment lines. (probably doesn't happen in debian list files
continue
}
line = strings.TrimSpace(line)
parts := strings.Split(line, " ")
if len(parts) == 1 {
namemap[parts[0]] = ""
}
if len(parts) < 2 {
continue
}
last = parts[0]
namemap[last] = strings.Join(parts[1:], " ") + "\n"
if last == "Package:" {
name = parts[1]
}
if last == "Version:" {
version = parts[1]
}
if last == "Filename:" {
filename = strings.Join(parts[1:], " ")
}
if last == "GoPath:" {
gopath = parts[1]
}
}
p := zoopb.Package{
Name: name,
Version: version,
PkgName: filename,
SrcPath: gopath,
}
return &p, namemap
}
|
