docker info

Author: michele-sciabarra

iosdk/docker.go

@@ -5,6 +5,14 @@ import (
 	"strings"
 )
 
+func dockerInfo() (string, error) {
+	out, err := SysErr("@docker info")
+	if err != nil {
+		return "", fmt.Errorf("Docker is not running")
+	}
+	return out, nil
+}
+
 func dockerVersion() (string, error) {
 	return SysErr("@docker version --format {{.Server.Version}}")
 }

iosdk/docker_test.go

@@ -25,5 +25,17 @@ func ExampleDockerIP() {
 	// 192.168.192.168
 	// docker inspect --format={{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}} dummy
 	// <nil>
+}
 
+func ExampleDockerInfo() {
+	DryRunPush("!bad", "Info: hello")
+	out, err := dockerInfo()
+	fmt.Println(1, err, out)
+	out, err = dockerInfo()
+	fmt.Println(2, err, out)
+	// Output:
+	// docker info
+	// 1 Docker is not running
+	// docker info
+	// 2 <nil> Info: hello
 }

iosdk/preflight.go

@@ -49,7 +49,11 @@ func preflightInHomePath(dir string) error {
 
 // Preflight perform preflight checks
 func Preflight(dir string) error {
-	err := preflightDockerMemory()
+	info, err := dockerInfo()
+	if err != nil {
+		return err
+	}
+	err = preflightDockerMemory(info)
 	if err != nil {
 		return err
 	}
@@ -65,25 +69,23 @@ func Preflight(dir string) error {
 }
 
 // preflightDockerMemory checks docker memory
-func preflightDockerMemory() error {
-	out, err := SysErr("@docker info")
-	if err != nil {
-		return fmt.Errorf("Docker is not running")
-	}
+func preflightDockerMemory(info string) error {
 	var search = regexp.MustCompile(`Total Memory: (.*)`)
-	result := search.FindString(string(out))
+	result := search.FindString(string(info))
 	if result == "" {
 		return fmt.Errorf("Docker is not running")
 	}
 	mem := strings.Split(result, ":")
 	memory := strings.TrimSpace(mem[1])
 	n, err := units.ParseStrictBytes(memory)
+	if err != nil {
+		return err
+	}
 	log.Debug("mem:", n)
 	//fmt.Println(n)
 	if n <= int64(MinDockerMem) {
 		return fmt.Errorf("IOSDK needs 4GB memory allocatable on docker")
 	}
-
 	return nil
 
 }

iosdk/preflight_test.go

@@ -37,9 +37,8 @@ func ExampleInHomePath() {
 func ExamplePreflightDockerMemory() {
 	*DryRunFlag = true
 	*verboseFlag = true
-	DryRunPush("\nTotal Memory: 11GiB\n", "\nTotal Memory: 3GiB\n")
-	fmt.Println(preflightDockerMemory())
-	fmt.Println(preflightDockerMemory())
+	fmt.Println(preflightDockerMemory("\nTotal Memory: 11GiB\n"))
+	fmt.Println(preflightDockerMemory("\nTotal Memory: 3GiB\n"))
 	// Output:
 	// docker info
 	// <nil>