Add command args to container creation (#6)

formatting

formatting

Author: CodingParsley

Diff for: apis/druid/v1alpha1/druid_types.go

@@ -91,9 +91,16 @@ type DruidSpec struct {
 	// +optional
 	DeleteOrphanPvc bool `json:"deleteOrphanPvc"`
 
-	// Required: path to druid start script to be run on container start
+	// Required: Command to be run on container start
 	StartScript string `json:"startScript"`
 
+	// Optional: bash/sh entry arg. Set startScript to `sh` or `bash` to customize entryArg
+	// For example, the container can run `sh -c "${EntryArg} && ${DruidScript} {nodeType}"`
+	EntryArg string `json:"entryArg,omitempty"`
+
+	// Optional: Customized druid shell script path. If not set, the default would be "bin/run-druid.sh"
+	DruidScript string `json:"druidScript,omitempty"`
+
 	// Required here or at nodeSpec level
 	Image string `json:"image,omitempty"`
 

Diff for: controllers/druid/handler.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"regexp"
 	"sort"
+	"strings"
 
 	autoscalev2beta2 "k8s.io/api/autoscaling/v2beta2"
 	networkingv1 "k8s.io/api/networking/v1"
@@ -1138,6 +1139,21 @@ func getVolume(nodeSpec *v1alpha1.DruidNodeSpec, m *v1alpha1.Druid, nodeSpecUniq
 	return volumesHolder
 }
 
+func getCommand(nodeSpec *v1alpha1.DruidNodeSpec, m *v1alpha1.Druid) []string {
+	if m.Spec.StartScript != "" && m.Spec.EntryArg != "" {
+		return []string{m.Spec.StartScript}
+	}
+	return []string{firstNonEmptyStr(m.Spec.StartScript, "bin/run-druid.sh"), nodeSpec.NodeType}
+}
+
+func getEntryArg(nodeSpec *v1alpha1.DruidNodeSpec, m *v1alpha1.Druid) []string {
+	if m.Spec.EntryArg != "" {
+		bashCommands := strings.Join([]string{m.Spec.EntryArg, "&&", firstNonEmptyStr(m.Spec.DruidScript, "bin/run-druid.sh"), nodeSpec.NodeType}, " ")
+		return []string{"-c", bashCommands}
+	}
+	return nil
+}
+
 func getEnv(nodeSpec *v1alpha1.DruidNodeSpec, m *v1alpha1.Druid, configMapSHA string) []v1.EnvVar {
 	envHolder := firstNonNilValue(nodeSpec.Env, m.Spec.Env).([]v1.EnvVar)
 	// enables to do the trick to force redeployment in case of configmap changes.
@@ -1308,7 +1324,8 @@ func makePodSpec(nodeSpec *v1alpha1.DruidNodeSpec, m *v1alpha1.Druid, nodeSpecUn
 		v1.Container{
 			Image:           firstNonEmptyStr(nodeSpec.Image, m.Spec.Image),
 			Name:            fmt.Sprintf("%s", nodeSpecUniqueStr),
-			Command:         []string{firstNonEmptyStr(m.Spec.StartScript, "bin/run-druid.sh"), nodeSpec.NodeType},
+			Command:         getCommand(nodeSpec, m),
+			Args:            getEntryArg(nodeSpec, m),
 			ImagePullPolicy: v1.PullPolicy(firstNonEmptyStr(string(nodeSpec.ImagePullPolicy), string(m.Spec.ImagePullPolicy))),
 			Ports:           nodeSpec.Ports,
 			Resources:       nodeSpec.Resources,