Add error handling for when template not found

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

README.md

@@ -125,7 +125,7 @@ Since faas-containerd uses containerd heavily it is not running as a container,
 
 #### Installation with systemd
 
-* `faasd install` - install faasd and containerd with systemd
+* `faasd install` - install faasd and containerd with systemd, run in `$GOPATH/src/github.com/alexellis/faasd`
 * `journalctl -u faasd` - faasd systemd logs
 * `journalctl -u faas-containerd` - faas-containerd systemd logs
 
@@ -134,11 +134,11 @@ Since faas-containerd uses containerd heavily it is not running as a container,
 Removing containers:
 
 ```sh
-echo faas-containerd gateway prometheus |xargs sudo ctr task rm -f
+echo faas-containerd gateway prometheus | xargs sudo ctr task rm -f
 
-echo faas-containerd gateway prometheus |xargs sudo ctr container rm
+echo faas-containerd gateway prometheus | xargs sudo ctr container rm
 
-echo faas-containerd gateway prometheus |xargs sudo ctr snapshot rm
+echo faas-containerd gateway prometheus | xargs sudo ctr snapshot rm
 ```
 
 ## Links
@@ -151,4 +151,3 @@ https://github.com/containernetworking/plugins
 
 https://github.com/containerd/go-cni
 
-

pkg/systemd/systemd.go

@@ -65,8 +65,12 @@ func DaemonReload() error {
 }
 
 func InstallUnit(name string) error {
+	tmplName := "./hack/" + name + ".service"
+	tmpl, err := template.ParseFiles()
 
-	tmpl, err := template.ParseFiles("./hack/" + name + ".service")
+	if err != nil {
+		return fmt.Errorf("error loading template %s, error %s", tmplName, err)
+	}
 
 	wd, _ := os.Getwd()
 	var tpl bytes.Buffer