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package main
import (
"bytes"
"encoding/json"
"fmt"
"os"
"strings"
"sync"
"time"
gosrc "github.com/Morganamilo/go-srcinfo"
)
// Info contains the last commit sha of a repo
type vcsInfo map[string]shaInfos
type shaInfos map[string]shaInfo
type shaInfo struct {
Protocols []string `json:"protocols"`
Branch string `json:"branch"`
SHA string `json:"sha"`
}
// createDevelDB forces yay to create a DB of the existing development packages
func createDevelDB() error {
var mux sync.Mutex
var wg sync.WaitGroup
_, _, _, remoteNames, err := filterPackages()
if err != nil {
return err
}
info, err := aurInfoPrint(remoteNames)
if err != nil {
return err
}
bases := getBases(info)
toSkip := pkgbuildsToSkip(bases, sliceToStringSet(remoteNames))
downloadPkgbuilds(bases, toSkip, config.BuildDir)
srcinfos, _ := parseSrcinfoFiles(bases, false)
for _, pkgbuild := range srcinfos {
for _, pkg := range pkgbuild.Packages {
wg.Add(1)
go updateVCSData(pkg.Pkgname, pkgbuild.Source, &mux, &wg)
}
}
wg.Wait()
fmt.Println(bold(yellow(arrow) + bold(" GenDB finished. No packages were installed")))
return err
}
// parseSource returns the git url, default branch and protocols it supports
func parseSource(source string) (url string, branch string, protocols []string) {
split := strings.Split(source, "::")
source = split[len(split)-1]
split = strings.SplitN(source, "://", 2)
if len(split) != 2 {
return "", "", nil
}
protocols = strings.SplitN(split[0], "+", 2)
git := false
for _, protocol := range protocols {
if protocol == "git" {
git = true
break
}
}
protocols = protocols[len(protocols)-1:]
if !git {
return "", "", nil
}
split = strings.SplitN(split[1], "#", 2)
if len(split) == 2 {
secondSplit := strings.SplitN(split[1], "=", 2)
if secondSplit[0] != "branch" {
//source has #commit= or #tag= which makes them not vcs
//packages because they reference a specific point
return "", "", nil
}
if len(secondSplit) == 2 {
url = split[0]
branch = secondSplit[1]
}
} else {
url = split[0]
branch = "HEAD"
}
url = strings.Split(url, "?")[0]
branch = strings.Split(branch, "?")[0]
return
}
func updateVCSData(pkgName string, sources []gosrc.ArchString, mux *sync.Mutex, wg *sync.WaitGroup) {
defer wg.Done()
if savedInfo == nil {
mux.Lock()
savedInfo = make(vcsInfo)
mux.Unlock()
}
info := make(shaInfos)
checkSource := func(source gosrc.ArchString) {
defer wg.Done()
url, branch, protocols := parseSource(source.Value)
if url == "" || branch == "" {
return
}
commit := getCommit(url, branch, protocols)
if commit == "" {
return
}
mux.Lock()
info[url] = shaInfo{
protocols,
branch,
commit,
}
savedInfo[pkgName] = info
fmt.Println(bold(yellow(arrow)) + " Found git repo: " + cyan(url))
saveVCSInfo()
mux.Unlock()
}
for _, source := range sources {
wg.Add(1)
go checkSource(source)
}
}
func getCommit(url string, branch string, protocols []string) string {
if len(protocols) > 0 {
protocol := protocols[len(protocols)-1]
var outbuf bytes.Buffer
cmd := passToGit("", "ls-remote", protocol+"://"+url, branch)
cmd.Stdout = &outbuf
cmd.Env = append(os.Environ(), "GIT_TERMINAL_PROMPT=0")
err := cmd.Start()
if err != nil {
return ""
}
//for some reason
//git://bitbucket.org/volumesoffun/polyvox.git` hangs on my
//machine but using http:// instead of git does not hang.
//Introduce a time out so this can not hang
timer := time.AfterFunc(5*time.Second, func() {
cmd.Process.Kill()
})
err = cmd.Wait()
timer.Stop()
if err != nil {
return ""
}
stdout := outbuf.String()
split := strings.Fields(stdout)
if len(split) < 2 {
return ""
}
commit := split[0]
return commit
}
return ""
}
func (infos shaInfos) needsUpdate() bool {
//used to signal we have gone through all sources and found nothing
finished := make(chan struct{})
alive := 0
//if we find an update we use this to exit early and return true
hasUpdate := make(chan struct{})
checkHash := func(url string, info shaInfo) {
hash := getCommit(url, info.Branch, info.Protocols)
if hash != "" && hash != info.SHA {
hasUpdate <- struct{}{}
} else {
finished <- struct{}{}
}
}
for url, info := range infos {
alive++
go checkHash(url, info)
}
for {
select {
case <-hasUpdate:
return true
case <-finished:
alive--
if alive == 0 {
return false
}
}
}
}
func saveVCSInfo() error {
marshalledinfo, err := json.MarshalIndent(savedInfo, "", "\t")
if err != nil || string(marshalledinfo) == "null" {
return err
}
in, err := os.OpenFile(vcsFile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer in.Close()
_, err = in.Write(marshalledinfo)
if err != nil {
return err
}
err = in.Sync()
return err
}