Check for mutually exclusive flags

Error out if more than one mutually exclusive flags are passed
in to kpod ps

Signed-off-by: umohnani8 <umohnani@redhat.com>

Closes: #128
Approved by: rhatdan

1 files changed, 28 insertions, 3 deletions

diff --git a/cmd/kpod/ps.go b/cmd/kpod/ps.go
index 4148edf68..89fed991f 100644
--- a/cmd/kpod/ps.go
+++ b/cmd/kpod/ps.go
@@ -143,9 +143,8 @@ func psCmd(c *cli.Context) error {
 		return err
 	}
 
-	// latest, and last are mutually exclusive.
-	if c.Int("last") >= 0 && c.Bool("latest") {
-		return errors.Errorf("last and latest are mutually exclusive")
+	if err := checkFlagsPassed(c); err != nil {
+		return errors.Wrapf(err, "error with flags passed")
 	}
 
 	runtime, err := getRuntime(c)
@@ -212,6 +211,32 @@ func psCmd(c *cli.Context) error {
 	return generatePsOutput(outputContainers, opts)
 }
 
+// checkFlagsPassed checks if mutually exclusive flags are passed together
+func checkFlagsPassed(c *cli.Context) error {
+	// latest, and last are mutually exclusive.
+	if c.Int("last") >= 0 && c.Bool("latest") {
+		return errors.Errorf("last and latest are mutually exclusive")
+	}
+	// quiet, size, namespace, and format with Go template are mutually exclusive
+	flags := 0
+	if c.Bool("quiet") {
+		flags++
+	}
+	if c.Bool("size") {
+		flags++
+	}
+	if c.Bool("namespace") {
+		flags++
+	}
+	if c.IsSet("format") && c.String("format") != formats.JSONString {
+		flags++
+	}
+	if flags > 1 {
+		return errors.Errorf("quiet, size, namespace, and format with Go template are mutually exclusive")
+	}
+	return nil
+}
+
 func generateContainerFilterFuncs(filter, filterValue string, runtime *libpod.Runtime) (func(container *libpod.Container) bool, error) {
 	switch filter {
 	case "id":