kyverno/pkg/engine/mutate/generatePatches_test.go

package mutate

import (
	"encoding/json"
	"testing"

	"github.com/nirmata/kyverno/pkg/engine/utils"
	assertnew "github.com/stretchr/testify/assert"
	"gotest.tools/assert"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)

func Test_GeneratePatches(t *testing.T) {

	out, err := strategicMergePatch(string(baseBytes), string(overlayBytes))
	assert.NilError(t, err)

	patches, err := generatePatches(baseBytes, out)
	assert.NilError(t, err)
	t.Logf("patches\n%v", patches)

	var overlay unstructured.Unstructured
	err = json.Unmarshal(baseBytes, &overlay)
	assert.NilError(t, err)

	bb, err := json.Marshal(overlay.Object)
	assert.NilError(t, err)

	res, err := utils.ApplyPatches(bb, patches)
	assert.NilError(t, err)

	var ep unstructured.Unstructured
	err = json.Unmarshal(expectBytes, &ep)
	assert.NilError(t, err)

	eb, err := json.Marshal(ep.Object)
	assert.NilError(t, err)

	if !assertnew.Equal(t, string(eb), string(res)) {
		t.FailNow()
	}
}

var baseBytes = []byte(`
{
  "apiVersion": "apps/v1",
  "kind": "Deployment",
  "metadata": {
    "name": "wordpress",
    "labels": {
      "app": "wordpress"
    }
  },
  "spec": {
    "selector": {
      "matchLabels": {
        "app": "wordpress"
      }
    },
    "strategy": {
      "type": "Recreate"
    },
    "template": {
      "metadata": {
        "labels": {
          "app": "wordpress"
        }
      },
      "spec": {
        "containers": [
          {
            "image": "wordpress:4.8-apache",
            "name": "wordpress",
            "ports": [
              {
                "containerPort": 80,
                "name": "wordpress"
              }
            ],
            "volumeMounts": [
              {
                "name": "wordpress-persistent-storage",
                "mountPath": "/var/www/html"
              }
            ]
          }
        ],
        "volumes": [
          {
            "name": "wordpress-persistent-storage"
          }
        ]
      }
    }
  }
}
`)

var overlayBytes = []byte(`
{
  "apiVersion": "apps/v1",
  "kind": "Deployment",
  "metadata": {
    "name": "wordpress"
  },
  "spec": {
    "template": {
      "spec": {
        "initContainers": [
          {
            "name": "init-command",
            "image": "debian",
            "command": [
              "echo $(WORDPRESS_SERVICE)",
              "echo $(MYSQL_SERVICE)"
            ]
          }
        ],
        "containers": [
          {
            "name": "nginx",
            "image": "nginx"
          },
          {
            "name": "wordpress",
            "env": [
              {
                "name": "WORDPRESS_DB_HOST",
                "value": "$(MYSQL_SERVICE)"
              },
              {
                "name": "WORDPRESS_DB_PASSWORD",
                "valueFrom": {
                  "secretKeyRef": {
                    "name": "mysql-pass",
                    "key": "password"
                  }
                }
              }
            ]
          }
        ]
      }
    }
  }
}
`)

var expectBytes = []byte(`
{
  "apiVersion": "apps/v1",
  "kind": "Deployment",
  "metadata": {
    "name": "wordpress",
    "labels": {
      "app": "wordpress"
    }
  },
  "spec": {
    "selector": {
      "matchLabels": {
        "app": "wordpress"
      }
    },
    "strategy": {
      "type": "Recreate"
    },
    "template": {
      "metadata": {
        "labels": {
          "app": "wordpress"
        }
      },
      "spec": {
        "containers": [
          {
            "image": "wordpress:4.8-apache",
            "name": "wordpress",
            "ports": [
              {
                "containerPort": 80,
                "name": "wordpress"
              }
            ],
            "volumeMounts": [
              {
                "name": "wordpress-persistent-storage",
                "mountPath": "/var/www/html"
              }
            ],
            "env": [
              {
                "name": "WORDPRESS_DB_HOST",
                "value": "$(MYSQL_SERVICE)"
              },
              {
                "name": "WORDPRESS_DB_PASSWORD",
                "valueFrom": {
                  "secretKeyRef": {
                    "name": "mysql-pass",
                    "key": "password"
                  }
                }
              }
            ]
          },
          {
            "name": "nginx",
            "image": "nginx"
          }
        ],
        "volumes": [
          {
            "name": "wordpress-persistent-storage"
          }
        ],
        "initContainers": [
          {
            "name": "init-command",
            "image": "debian",
            "command": [
              "echo $(WORDPRESS_SERVICE)",
              "echo $(MYSQL_SERVICE)"
            ]
          }
        ]
      }
    }
  }
}
`)