Can't use RunKubectlAndGetOutputE to CURL a Pod with a JSON Body

[rstoermer]

Describe the bug
I want to run HTTP Requests inside a KIND cluster using Terratest without creating a Port-Forward first. With a simple GET request this works easily using something like

	frontendResponse, err := k8s.RunKubectlAndGetOutputE(
		t,
		kubectlOptionsArgocd, "run", "curl-frontend", "--image", "alpine/curl", "--rm", "-it", "--restart=Never", "--",
		"curl", "-iLk", SomeFrontendUrl)
	if err != nil {
		t.Fatal(err)
	}

However when doing a POST Request with some JSON data this fails, although the request works when I do this manually in kubectl.

To Reproduce
I am using ArgoCD here, but I guess this should be the same for all services that unmarshal some JSON they receive from curl. I reckon this has to do with the way the JSON string is passed through Go until it reaches kubectl...

While this works

k run curl-argocd-session-token --image alpine/curl --rm -it --restart=Never -- curl -X POST -H "Content-Type: application/json", -iLk argocd-server.argocd.svc.cluster.local:443/api/v1/session -d "{\"username\":\"test-user\",\"password\":\"somePassword\"}"

This doesn't

	argoSessionToken, err := k8s.RunKubectlAndGetOutputE(
		t,
		kubectlOptionsArgocd,
		"run", "curl-argocd-session-token", "--image", "alpine/curl", "--rm", "-it", "--restart=Never", "--",
		"curl", "-X", "POST", "-H", "Content-Type: application/json", "-iLk", ArgoCdApiSessionUrl, "-d", argoCurlRequestData)
	if err != nil {
		t.Fatal(err)
	}

The following happens depending on what I format in Go

1. Input

	argoCurlRequestData := fmt.Sprintf(`{\"username\":\"test-user\",\"password\":\"%s\"}`, argoCdPassword)

Output:
{\"username\":\"test-user\",\"password\":\"somePassword\"}
Terratest Output in Console:
Running command kubectl with args [--namespace argocd run curl-argocd-session-token --image alpine/curl --rm -it --restart=Never -- curl -X POST -H Content-Type: application/json -iLk argocd-server.argocd.svc.cluster.local:443/api/v1/session -d {\"username\":\"test-user\",\"password\":\"somePassword\"}]
Error Message:
{"error":"invalid character '\\\\' looking for beginning of object key string","code":3,"message":"invalid character '\\\\' looking for beginning of object key string"}

2. Input

	argoCurlRequestData := fmt.Sprintf(`"{\"username\":\"test-user\",\"password\":\"%s\"}"`, argoCdPassword)

Output:
"{\"username\":\"test-user\",\"password\":\"somePassword\"}"
Terratest Output in Console:
Running command kubectl with args [--namespace argocd run curl-argocd-session-token --image alpine/curl --rm -it --restart=Never -- curl -X POST -H Content-Type: application/json -iLk argocd-server.argocd.svc.cluster.local:443/api/v1/session -d "{\"username\":\"test-user\",\"password\":\"somePassword\"}"]
Error Message:
{"error":"json: cannot unmarshal string into Go value of type session.SessionCreateRequest","code":3,"message":"json: cannot unmarshal string into Go value of type session.SessionCreateRequest"}

Expected behavior
The POST Request using a Curl POD works the same as if I would execute the command from a local shell using Kubectl

Versions

• Terratest version: v0.43.13
• Environment details (Ubuntu 20.04, Windows 10, etc.): OS X newest version

Additional context
I also tried other ways to format the String, e.g. by using backticks or even more obscure ways. No luck. I only see the option to create a Port-Forwarding or start the tests in a Docker Container inside the K8s Cluster

[rstoermer]

Also tried this with an override:

frontendResponse, err := k8s.RunKubectlAndGetOutputE(t, kubectlOptionsMongoDb, "run", "curl", "--image", "curlimages/curl", "--rm", "-it", "--restart=Never",
		"--overrides", `'{"apiVersion": "v1", "metadata": {"annotations": { "sidecar.istio.io/inject":"false" } } }'`,
		"--", "curl", "argo-argo-workflows-server.argowf.svc.cluster.local:2746")

Tried all kinds of formatting styles apart from the above one, always getting a error: Invalid JSON Patch