misc, webserver: use circus to manage git-daemon

Closes tsuru/tsuru#241.

misc/circus.ini

@@ -10,6 +10,12 @@ cmd = /home/git/gandalf/dist/gandalf-webserver
 uid = git
 copy_env = True
 
+[watcher:git-daemon]
+cmd = git
+args = daemon --base-path=/repositories/path --syslog --export-all
+copy_env = True
+uid = git
+
 [watcher:mongodb]
 cmd = /home/ubuntu/tsuru/start-mongo.bash
 args = /var/lib/mongodb

webserver/main.go

@@ -6,28 +6,14 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"github.com/bmizerany/pat"
 	"github.com/globocom/config"
 	"github.com/globocom/gandalf/api"
 	"github.com/globocom/gandalf/db"
 	"log"
 	"net/http"
-	"os/exec"
 )
 
-func startGitDaemon() error {
-	bLocation, err := config.GetString("git:bare:location")
-	if err != nil {
-		return err
-	}
-	args := []string{"daemon", fmt.Sprintf("--base-path=%s", bLocation), "--syslog"}
-	if exportAll, err := config.GetBool("git:daemon:export-all"); err == nil && exportAll {
-		args = append(args, "--export-all")
-	}
-	return exec.Command("git", args...).Run()
-}
-
 func main() {
 	dry := flag.Bool("dry", false, "dry-run: does not start the server and git daemon (for testing purpose)")
 	configFile := flag.String("config", "/etc/gandalf.conf", "Gandalf configuration file")
@@ -55,7 +41,6 @@ For an example conf check gandalf/etc/gandalf.conf file.`
 		panic(err)
 	}
 	if !*dry {
-		startGitDaemon()
 		log.Fatal(http.ListenAndServe(port, router))
 	}
 }