Port configuration to ccConfig scheme

Decentralize config validation
Modularize configuration handling

pkg/runtimeEnv/setup.go

@@ -1,73 +0,0 @@
-// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
-// All rights reserved. This file is part of cc-backend.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
-package runtimeEnv
-
-import (
-	"fmt"
-	"os"
-	"os/exec"
-	"os/user"
-	"strconv"
-	"syscall"
-
-	cclog "github.com/ClusterCockpit/cc-lib/ccLogger"
-)
-
-// Changes the processes user and group to that
-// specified in the config.json. The go runtime
-// takes care of all threads (and not only the calling one)
-// executing the underlying systemcall.
-func DropPrivileges(username string, group string) error {
-	if group != "" {
-		g, err := user.LookupGroup(group)
-		if err != nil {
-			cclog.Warn("Error while looking up group")
-			return err
-		}
-
-		gid, _ := strconv.Atoi(g.Gid)
-		if err := syscall.Setgid(gid); err != nil {
-			cclog.Warn("Error while setting gid")
-			return err
-		}
-	}
-
-	if username != "" {
-		u, err := user.Lookup(username)
-		if err != nil {
-			cclog.Warn("Error while looking up user")
-			return err
-		}
-
-		uid, _ := strconv.Atoi(u.Uid)
-		if err := syscall.Setuid(uid); err != nil {
-			cclog.Warn("Error while setting uid")
-			return err
-		}
-	}
-
-	return nil
-}
-
-// If started via systemd, inform systemd that we are running:
-// https://www.freedesktop.org/software/systemd/man/sd_notify.html
-func SystemdNotifiy(ready bool, status string) {
-	if os.Getenv("NOTIFY_SOCKET") == "" {
-		// Not started using systemd
-		return
-	}
-
-	args := []string{fmt.Sprintf("--pid=%d", os.Getpid())}
-	if ready {
-		args = append(args, "--ready")
-	}
-
-	if status != "" {
-		args = append(args, fmt.Sprintf("--status=%s", status))
-	}
-
-	cmd := exec.Command("systemd-notify", args...)
-	cmd.Run() // errors ignored on purpose, there is not much to do anyways.
-}