Images and headers flags for run command

Makefile

@@ -11,16 +11,22 @@ GIT_BRANCH_CLEAN := $(shell echo $(GIT_BRANCH) | sed -e "s/[^[:alnum:]]/-/g")
 IMAGE_NAME      ?= quay.io/fntlnz/kubectl-trace-bpftrace
 IMAGE_NAME_BASE ?= quay.io/fntlnz/kubectl-trace-bpftrace-base
 
+IMAGE_NAME_INIT ?= quay.io/fntlnz/kubectl-trace-init
+
 IMAGE_TRACERUNNER_BRANCH := $(IMAGE_NAME):$(GIT_BRANCH_CLEAN)
 IMAGE_TRACERUNNER_COMMIT := $(IMAGE_NAME):$(GIT_COMMIT)
 IMAGE_TRACERUNNER_LATEST := $(IMAGE_NAME):latest
 
+IMAGE_INITCONTAINER_BRANCH := $(IMAGE_NAME_INIT):$(GIT_BRANCH_CLEAN)
+IMAGE_INITCONTAINER_COMMIT := $(IMAGE_NAME_INIT):$(GIT_COMMIT)
+IMAGE_INITCONTAINER_LATEST := $(IMAGE_NAME_INIT):latest
+
 BPFTRACESHA ?= 2ae2a53f62622631a304def6c193680e603994e3
 IMAGE_BPFTRACE_BASE := $(IMAGE_NAME_BASE):$(BPFTRACESHA)
 
 IMAGE_BUILD_FLAGS ?= "--no-cache"
 
-LDFLAGS := -ldflags '-X github.com/iovisor/kubectl-trace/pkg/version.buildTime=$(shell date +%s) -X github.com/iovisor/kubectl-trace/pkg/version.gitCommit=${GIT_COMMIT} -X github.com/iovisor/kubectl-trace/pkg/version.imageName=${IMAGE_NAME}'
+LDFLAGS := -ldflags '-X github.com/iovisor/kubectl-trace/pkg/version.buildTime=$(shell date +%s) -X github.com/iovisor/kubectl-trace/pkg/version.gitCommit=${GIT_COMMIT} -X github.com/iovisor/kubectl-trace/pkg/cmd.ImageNameTag=${IMAGE_TRACERUNNER_COMMIT} -X github.com/iovisor/kubectl-trace/pkg/cmd.InitImageNameTag=${IMAGE_INITCONTAINER_COMMIT}'
 TESTPACKAGES := $(shell go list ./... | grep -v github.com/iovisor/kubectl-trace/integration)
 
 kubectl_trace ?= _output/bin/kubectl-trace
@@ -65,7 +71,7 @@ test:
 
 .PHONY: integration
 integration:
-	TEST_KUBECTLTRACE_BINARY=$(shell pwd)/$(kubectl_trace) $(GO)  test ${LDFLAGS} -v ./integration/...
+	TEST_KUBECTLTRACE_BINARY=$(shell pwd)/$(kubectl_trace) $(GO) test ${LDFLAGS} -v ./integration/...
 
 .PHONY: bpftraceimage/build
 bpftraceimage/build:

integration/suite_test.go

@@ -9,7 +9,7 @@ import (
 	"time"
 
 	"github.com/go-check/check"
-	"github.com/iovisor/kubectl-trace/pkg/version"
+	"github.com/iovisor/kubectl-trace/pkg/cmd"
 	"gotest.tools/icmd"
 	"sigs.k8s.io/kind/pkg/cluster"
 	"sigs.k8s.io/kind/pkg/cluster/config/encoding"
@@ -59,7 +59,7 @@ func (k *KubectlTraceSuite) SetUpSuite(c *check.C) {
 
 	// copy the bpftrace image to the nodes
 	for _, n := range nodes {
-		loadcomm := fmt.Sprintf("docker save %s | docker exec -i %s docker load", version.ImageNameTag(), n.String())
+		loadcomm := fmt.Sprintf("docker save %s | docker exec -i %s docker load", cmd.ImageNameTag, n.String())
 		res := icmd.RunCommand("bash", "-c", loadcomm)
 		c.Assert(res.Error, check.IsNil)
 	}

pkg/cmd/attach.go

@@ -92,6 +92,7 @@ func (o *AttachOptions) Validate(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+// Complete completes the setup of the command.
 func (o *AttachOptions) Complete(factory factory.Factory, cmd *cobra.Command, args []string) error {
 	// Prepare namespace
 	var err error

pkg/cmd/delete.go

@@ -102,6 +102,7 @@ func (o *DeleteOptions) Validate(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+// Complete completes the setup of the command.
 func (o *DeleteOptions) Complete(factory factory.Factory, cmd *cobra.Command, args []string) error {
 	// Prepare namespace
 	var err error

pkg/cmd/get.go

@@ -111,6 +111,7 @@ func (o *GetOptions) Validate(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+// Complete completes the setup of the command.
 func (o *GetOptions) Complete(factory factory.Factory, cmd *cobra.Command, args []string) error {
 	// Prepare namespace
 	var err error
@@ -125,7 +126,7 @@ func (o *GetOptions) Complete(factory factory.Factory, cmd *cobra.Command, args
 		o.namespace = ""
 	}
 
-	//// Prepare client
+	// Prepare client
 	o.clientConfig, err = factory.ToRESTConfig()
 	if err != nil {
 		return err

pkg/cmd/log.go

@@ -85,6 +85,7 @@ func NewLogCommand(factory factory.Factory, streams genericclioptions.IOStreams)
 	return cmd
 }
 
+// Validate validates the arguments and flags populating LogOptions accordingly.
 func (o *LogOptions) Validate(cmd *cobra.Command, args []string) error {
 	if meta.IsObjectName(args[0]) {
 		o.traceName = &args[0]
@@ -96,6 +97,7 @@ func (o *LogOptions) Validate(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+// Complete completes the setup of the command.
 func (o *LogOptions) Complete(factory factory.Factory, cmd *cobra.Command, args []string) error {
 	// Prepare namespace
 	var err error

pkg/cmd/run.go

@@ -20,22 +20,34 @@ import (
 	"k8s.io/client-go/rest"
 )
 
+var (
+	// ImageNameTag represents the default tracerunner image
+	ImageNameTag = "quay.io/fntlnz/kubectl-trace-bpftrace:latest"
+	// InitImageNameTag represents the default init container image
+	InitImageNameTag = "quay.io/fntlnz/kubectl-trace-init:latest"
+)
+
 var (
 	runShort = `Execute a bpftrace program on resources` // Wrap with i18n.T()
 
 	runLong = runShort
 
 	runExamples = `
   # Count system calls using tracepoints on a specific node
-  %[1]s trace run node/kubernetes-node-emt8.c.myproject.internal -e 'kprobe:do_sys_open { printf("%s: %s\n", comm, str(arg1)) }'
+  %[1]s trace run node/kubernetes-node-emt8.c.myproject.internal -e 'kprobe:do_sys_open { printf("%%s: %%s\n", comm, str(arg1)) }'
 
   # Execute a bpftrace program from file on a specific node
   %[1]s trace run node/kubernetes-node-emt8.c.myproject.internal -f read.bt
 
   # Run an bpftrace inline program on a pod container
   %[1]s trace run pod/nginx -c nginx -e "tracepoint:syscalls:sys_enter_* { @[probe] = count(); }"
   %[1]s trace run pod/nginx nginx -e "tracepoint:syscalls:sys_enter_* { @[probe] = count(); }"
-  %[1]s trace run pod/nginx nginx -e "tracepoint:syscalls:sys_enter_* { @[probe] = count(); }"`
+
+  # Run a bpftrace inline program on a pod container with a custom image for the init container responsible to fetch linux headers 
+  %[1]s trace run pod/nginx nginx -e "tracepoint:syscalls:sys_enter_* { @[probe] = count(); } --init-imagename=quay.io/custom-init-image-name --fetch-headers"
+
+  # Run a bpftrace inline program on a pod container with a custom image for the bpftrace container that will run your program in the cluster
+  %[1]s trace run pod/nginx nginx -e "tracepoint:syscalls:sys_enter_* { @[probe] = count(); } --imagename=quay.io/custom-bpftrace-image-name"`
 
 	runCommand                    = "run"
 	usageString                   = "(POD | TYPE/NAME)"
@@ -53,17 +65,20 @@ type RunOptions struct {
 	namespace         string
 	explicitNamespace bool
 
-	// Local to this command
+	// Flags local to this command
 	container      string
 	eval           string
 	program        string
-	resourceArg    string
-	attach         bool
-	isPod          bool
-	podUID         string
 	serviceAccount string
+	imageName      string
+	initImageName  string
+	fetchHeaders   bool
 
-	nodeName string
+	resourceArg string
+	attach      bool
+	isPod       bool
+	podUID      string
+	nodeName    string
 
 	clientConfig *rest.Config
 }
@@ -72,6 +87,10 @@ type RunOptions struct {
 func NewRunOptions(streams genericclioptions.IOStreams) *RunOptions {
 	return &RunOptions{
 		IOStreams: streams,
+
+		serviceAccount: "default",
+		imageName:      ImageNameTag,
+		initImageName:  InitImageNameTag,
 	}
 }
 
@@ -101,10 +120,13 @@ func NewRunCommand(factory factory.Factory, streams genericclioptions.IOStreams)
 	}
 
 	cmd.Flags().StringVarP(&o.container, "container", "c", o.container, "Specify the container")
-	cmd.Flags().BoolVarP(&o.attach, "attach", "a", o.attach, "Wheter or not to attach to the trace program once it is created")
-	cmd.Flags().StringVarP(&o.eval, "eval", "e", "", "Literal string to be evaluated as a bpftrace program")
-	cmd.Flags().StringVarP(&o.program, "filename", "f", "", "File containing a bpftrace program")
-	cmd.Flags().StringVar(&o.serviceAccount, "serviceaccount", "default", "Service account to use to set in the pod spec of the kubectl-trace job")
+	cmd.Flags().BoolVarP(&o.attach, "attach", "a", o.attach, "Whether or not to attach to the trace program once it is created")
+	cmd.Flags().StringVarP(&o.eval, "eval", "e", o.eval, "Literal string to be evaluated as a bpftrace program")
+	cmd.Flags().StringVarP(&o.program, "filename", "f", o.program, "File containing a bpftrace program")
+	cmd.Flags().StringVar(&o.serviceAccount, "serviceaccount", o.serviceAccount, "Service account to use to set in the pod spec of the kubectl-trace job")
+	cmd.Flags().StringVar(&o.imageName, "imagename", o.imageName, "Custom image for the tracerunner")
+	cmd.Flags().StringVar(&o.initImageName, "init-imagename", o.initImageName, "Custom image for the init container responsible to fetch and prepare linux headers")
+	cmd.Flags().BoolVar(&o.fetchHeaders, "fetch-headers", o.fetchHeaders, "Whether to fetch linux headers or not")
 
 	return cmd
 }
@@ -276,6 +298,10 @@ func (o *RunOptions) Run() error {
 		PodUID:         o.podUID,
 		ContainerName:  o.container,
 		IsPod:          o.isPod,
+		// todo(dalehamel) > following fields to be used for #48
+		ImageNameTag:     o.imageName,
+		InitImageNameTag: o.initImageName,
+		FetchHeaders:     o.fetchHeaders,
 	}
 
 	job, err := tc.CreateJob(tj)

pkg/cmd/trace.go

@@ -76,5 +76,18 @@ func NewTraceCommand(streams genericclioptions.IOStreams) *cobra.Command {
 	cmd.AddCommand(NewVersionCommand(streams))
 	cmd.AddCommand(NewLogCommand(f, streams))
 
+	// Override help on all the commands tree
+	walk(cmd, func(c *cobra.Command) {
+		c.Flags().BoolP("help", "h", false, fmt.Sprintf("Help for the %s command", c.Name()))
+	})
+
 	return cmd
 }
+
+// walk calls f for c and all of its children.
+func walk(c *cobra.Command, f func(*cobra.Command)) {
+	f(c)
+	for _, c := range c.Commands() {
+		walk(c, f)
+	}
+}

pkg/cmd/tracerunner.go

@@ -50,7 +50,7 @@ func NewTraceRunnerCommand() *cobra.Command {
 	cmd.Flags().StringVarP(&o.podUID, "poduid", "p", o.podUID, "Specify the pod UID")
 	cmd.Flags().StringVarP(&o.programPath, "program", "f", "program.bt", "Specify the bpftrace program path")
 	cmd.Flags().StringVarP(&o.bpftraceBinaryPath, "bpftracebinary", "b", "/bin/bpftrace", "Specify the bpftrace binary path")
-	cmd.Flags().BoolVar(&o.inPod, "inpod", false, "Wether or not run this bpftrace in a pod's container process namespace")
+	cmd.Flags().BoolVar(&o.inPod, "inpod", false, "Whether or not run this bpftrace in a pod's container process namespace")
 	return cmd
 }
 
@@ -62,6 +62,7 @@ func (o *TraceRunnerOptions) Validate(cmd *cobra.Command, args []string) error {
 	return nil
 }
 
+// Complete completes the setup of the command.
 func (o *TraceRunnerOptions) Complete(cmd *cobra.Command, args []string) error {
 	return nil
 }

pkg/cmd/version.go

@@ -8,6 +8,7 @@ import (
 	"k8s.io/cli-runtime/pkg/genericclioptions"
 )
 
+// NewVersionCommand provides the version command.
 func NewVersionCommand(streams genericclioptions.IOStreams) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "version",

pkg/tracejob/job.go

@@ -2,18 +2,15 @@ package tracejob
 
 import (
 	"fmt"
-
-	"github.com/iovisor/kubectl-trace/pkg/version"
-
 	"io"
 	"io/ioutil"
 
 	"github.com/iovisor/kubectl-trace/pkg/meta"
 	batchv1 "k8s.io/api/batch/v1"
 	apiv1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
-	"k8s.io/apimachinery/pkg/api/resource"
 	batchv1typed "k8s.io/client-go/kubernetes/typed/batch/v1"
 	corev1typed "k8s.io/client-go/kubernetes/typed/core/v1"
 )
@@ -24,16 +21,20 @@ type TraceJobClient struct {
 	outStream    io.Writer
 }
 
+// TraceJob is a container of info needed to create the job responsible for tracing.
 type TraceJob struct {
-	Name           string
-	ID             types.UID
-	Namespace      string
-	ServiceAccount string
-	Hostname       string
-	Program        string
-	PodUID         string
-	ContainerName  string
-	IsPod          bool
+	Name             string
+	ID               types.UID
+	Namespace        string
+	ServiceAccount   string
+	Hostname         string
+	Program          string
+	PodUID           string
+	ContainerName    string
+	IsPod            bool
+	ImageNameTag     string
+	InitImageNameTag string
+	FetchHeaders     bool
 }
 
 // WithOutStream setup a file stream to output trace job operation information
@@ -252,19 +253,19 @@ func (t *TraceJobClient) CreateJob(nj TraceJob) (*batchv1.Job, error) {
 					Containers: []apiv1.Container{
 						apiv1.Container{
 							Name:    nj.Name,
-							Image:   version.ImageNameTag(),
+							Image:   nj.ImageNameTag,
 							Command: bpfTraceCmd,
 							TTY:     true,
 							Stdin:   true,
 							Resources: apiv1.ResourceRequirements{
-							        Requests: apiv1.ResourceList{
-							                apiv1.ResourceCPU:    resource.MustParse("100m"),
-							                apiv1.ResourceMemory: resource.MustParse("100Mi"),
-							        },
-							        Limits: apiv1.ResourceList{
-							                apiv1.ResourceCPU:    resource.MustParse("1"),
-							                apiv1.ResourceMemory: resource.MustParse("1G"),
-							        },
+								Requests: apiv1.ResourceList{
+									apiv1.ResourceCPU:    resource.MustParse("100m"),
+									apiv1.ResourceMemory: resource.MustParse("100Mi"),
+								},
+								Limits: apiv1.ResourceList{
+									apiv1.ResourceCPU:    resource.MustParse("1"),
+									apiv1.ResourceMemory: resource.MustParse("1G"),
+								},
 							},
 							VolumeMounts: []apiv1.VolumeMount{
 								apiv1.VolumeMount{

pkg/version/version.go

@@ -8,34 +8,15 @@ import (
 
 // Populated by makefile
 var gitCommit string
-var imageName string
 var buildTime string
 var versionFormat = "git commit: %s\nbuild date: %s"
-var imageNameTagFormat = "%s:%s"
-var defaultImageName = "quay.io/fntlnz/kubectl-trace-bpftrace"
-var defaultImageTag = "latest"
-
-// ImageName returns the container image name defined in Makefile
-func ImageName() string {
-	return imageName
-}
 
+// GitCommit returns the git commit
 func GitCommit() string {
 	return gitCommit
 }
 
-func ImageNameTag() string {
-	imageName := ImageName()
-	tag := GitCommit()
-	if len(tag) == 0 {
-		tag = defaultImageTag
-	}
-	if len(imageName) == 0 {
-		imageName = defaultImageName
-	}
-	return fmt.Sprintf(imageNameTagFormat, imageName, tag)
-}
-
+// Time returns the build time
 func Time() *time.Time {
 	if len(buildTime) == 0 {
 		return nil
@@ -48,6 +29,7 @@ func Time() *time.Time {
 	return &t
 }
 
+// String returns version info as a string
 func String() string {
 	ts := Time()
 	if ts == nil {