func startGitDaemon(absolutePath string) error {
daemonSentinel := path.Join(absolutePath, ".git",
"git-daemon-export-ok")
if _, err := os.Stat(daemonSentinel); os.IsNotExist(err) {
_, err := os.Create(daemonSentinel)
if err != nil {
log.Fatalf("Unable to set up git daemon")
}
}
cmd := exec.Command("git", "daemon", "--reuseaddr",
fmt.Sprintf("--base-path=%s/..", absolutePath),
absolutePath)
err := cmd.Start()
return err
}
func main() {
// Start changes handler
var (
username = flag.String("user", "", "Username to report when sending changes to the network")
groupIP = flag.String("ip", gitsync.IP4MulticastAddr.IP.String(), "Multicast IP to connect to")
groupPort = flag.Int("port", gitsync.IP4MulticastAddr.Port, "Port to use for network IO")
logLevel = flag.String("loglevel", "info", "Lowest log level to emit. Can be one of debug, info, warning, error.")
logSocket = flag.String("logsocket", "", "proto://address:port target to send logs to")
logFile = flag.String("logfile", "", "path to file to log to")
webPort = flag.Int("webport", 0, "Port for local webserver. Off by default")
)
flag.Parse()
if len(flag.Args()) == 0 {
fatalf("No Git directory supplied")
}
if err := setupLogging(*logLevel, *logSocket, *logFile); err != nil {
fatalf("Cannot setup logging: %s", err)
}
log.Info("Starting up")
defer log.Info("Exiting")
var (
err error
dirName = flag.Args()[0] // directories to watch
userId string // username
groupAddr *net.UDPAddr // network address to connect to
// channels to move change messages around
remoteChanges = make(chan gitsync.GitChange, 128)
toRemoteChanges = make(chan gitsync.GitChange, 128)
)
dirName = util.AbsPath(dirName)
// get the user's name
if *username != "" {
userId = *username
} else if user, err := user.Current(); err == nil {
userId = user.Username
} else {
fatalf("Cannot get username: %v", err)
}
if groupAddr, err = net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", *groupIP, *groupPort)); err != nil {
fatalf("Cannot resolve address %v:%v: %v", *groupIP, *groupPort, err)
}
// start directory poller
repo, err := gitsync.NewCliRepo(userId, dirName)
if err != nil {
fatalf("Cannot open repo: %s", err)
}
if err = startGitDaemon(dirName); err != nil {
log.Fatalf("Unable to start git daemon")
}
go gitsync.PollDirectory(log.Global, dirName, repo, toRemoteChanges, 1*time.Second)
go gitsync.NetIO(log.Global, repo, groupAddr, remoteChanges, toRemoteChanges)
go ReceiveChanges(remoteChanges, uint16(*webPort), repo)
s := make(chan os.Signal, 1)
signal.Notify(s, os.Kill, os.Interrupt, syscall.SIGUSR1)
for {
c := <-s
cleanup(dirName)
if (c == os.Kill) || (c == os.Interrupt) {
break
}
}
}
// fatalf logs a fatal error and exits
func fatalf(format string, args ...interface{}) {
fmt.Fprintf(os.Stderr, format+"\n", args...)
log.Fatalf(format, args...)
}
