Commands with `;` in them are rendered (wrongly) into multiple stack frames in the Pixie flamegraphs.

[etep]

Description A command that has any ; characters in it is rendered into multiple stack frames instead of just one. After this happens, the colorization is also wrong. Most commands do not have this character in them, so we normally do not see this bug. However, we can easily construct an example by injecting the following (e.g.) into a yaml and deploying to k8s:

command: ["sh", "-c", "while $(curl --output /dev/null --silent --head --fail http://sample-app-svc); do sleep 0.02; done"]

Steps to reproduce

1. Create an image of golang-sample-app (hereafter, referred to as the "go server app") from https://github.com/codefresh-contrib/golang-sample-app/. For convenience, there is an image here: gcr.io/pl-pixies/users/jps/go-sample-app-multi:latest.

2. Create a pod for the go server app; you can use this yaml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: sample-app
  labels:
    app: sample-app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: sample-app
  template:
    metadata:
      labels:
        app: sample-app
    spec:
      containers:
      - name: sample-app
        image: gcr.io/pl-pixies/users/jps/go-sample-app-multi:latest
        ports:
        - containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
  name: sample-app-svc
spec:
  selector:
    app: sample-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

3. Create a pod for the workload, essentially a shell script that pings the server:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: sample-app-workload
  labels:
    app: sample-app-workload
spec:
  replicas: 1
  selector:
    matchLabels:
      app: sample-app-workload
  template:
    metadata:
      labels:
        app: sample-app-workload
    spec:
      containers:
      - name: sample-app-workload
        image: curlimages/curl
        command: ["sh", "-c", "while $(curl --output /dev/null --silent --head --fail http://sample-app-svc); do sleep 0.02; done"]

4. See error

Expected behavior We expect to see:

while $(curl --output /dev/null --silent --head --fail http://sample-app-svc); do sleep 0.02; done

rendered into a single stack frame and colorized in the darker blue hue.

Screenshots See, e.g. this flamegraph:

Logs n/a

App information (please complete the following information):

• Pixie version: dev/latest.
• K8s cluster version: pixie gke dev cluster.