config: add support for float64

system/env.go

@@ -31,9 +31,9 @@ func dropinContents(e interface{}) string {
 
 	var out string
 	for i := 0; i < et.NumField(); i++ {
-		if val := ev.Field(i).String(); val != "" {
+		if val := ev.Field(i).Interface(); !config.IsZero(val) {
 			key := et.Field(i).Tag.Get("env")
-			out += fmt.Sprintf("Environment=\"%s=%s\"\n", key, val)
+			out += fmt.Sprintf("Environment=\"%s=%v\"\n", key, val)
 		}
 	}
 

system/env_test.go

@@ -0,0 +1,55 @@
+package system
+
+import (
+	"testing"
+)
+
+func TestDropinContents(t *testing.T) {
+	tests := []struct {
+		Config   interface{}
+		Contents string
+	}{
+		{
+			struct{}{},
+			"",
+		},
+		{
+			struct {
+				A string  `env:"A"`
+				B int     `env:"B"`
+				C bool    `env:"C"`
+				D float64 `env:"D"`
+			}{
+				"hi", 1, true, 0.12345,
+			},
+			`[Service]
+Environment="A=hi"
+Environment="B=1"
+Environment="C=true"
+Environment="D=0.12345"
+`,
+		},
+		{
+			struct {
+				A float64 `env:"A"`
+				B float64 `env:"B"`
+				C float64 `env:"C"`
+				D float64 `env:"D"`
+			}{
+				0.000001, 1, 0.9999999, 0.1,
+			},
+			`[Service]
+Environment="A=1e-06"
+Environment="B=1"
+Environment="C=0.9999999"
+Environment="D=0.1"
+`,
+		},
+	}
+
+	for _, tt := range tests {
+		if c := dropinContents(tt.Config); c != tt.Contents {
+			t.Errorf("bad contents (%+v): want %q, got %q", tt, tt.Contents, c)
+		}
+	}
+}

system/etcd_test.go

@@ -67,7 +67,7 @@ Environment="ETCD_PEER_BIND_ADDR=127.0.0.1:7002"
 	} {
 		units := Etcd{tt.config}.Units()
 		if !reflect.DeepEqual(tt.units, units) {
-			t.Errorf("bad units (%q): want %#v, got %#v", tt.config, tt.units, units)
+			t.Errorf("bad units (%+v): want %#v, got %#v", tt.config, tt.units, units)
 		}
 	}
 }

system/fleet_test.go

@@ -48,7 +48,7 @@ Environment="FLEET_PUBLIC_IP=12.34.56.78"
 	} {
 		units := Fleet{tt.config}.Units()
 		if !reflect.DeepEqual(units, tt.units) {
-			t.Errorf("bad units (%q): want %#v, got %#v", tt.config, tt.units, units)
+			t.Errorf("bad units (%+v): want %#v, got %#v", tt.config, tt.units, units)
 		}
 	}
 }