From ce30311bbb6eea09dbc943fe57716ac5a0c680b9 Mon Sep 17 00:00:00 2001
From: Mikhail Scherba <mikhail.scherba@flant.com>
Date: Wed, 11 Sep 2024 18:13:18 +0300
Subject: [PATCH] add kind_exists helper

Signed-off-by: Mikhail Scherba <mikhail.scherba@flant.com>
---
 charts/helm_lib/Chart.yaml                 |  2 +-
 charts/helm_lib/README.md                  | 18 +++++++++++
 charts/helm_lib/templates/_kind_exists.tpl | 15 +++++++++
 tests/templates/helm_lib_kind_exists.yaml  |  1 +
 tests/tests/helm_lib_kind_exists_test.yaml | 37 ++++++++++++++++++++++
 5 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 charts/helm_lib/templates/_kind_exists.tpl
 create mode 100644 tests/templates/helm_lib_kind_exists.yaml
 create mode 100644 tests/tests/helm_lib_kind_exists_test.yaml

diff --git a/charts/helm_lib/Chart.yaml b/charts/helm_lib/Chart.yaml
index 4d78c5f..6336d07 100644
--- a/charts/helm_lib/Chart.yaml
+++ b/charts/helm_lib/Chart.yaml
@@ -1,5 +1,5 @@
 apiVersion: v2
 type: library
 name: deckhouse_lib_helm
-version: 1.29.0
+version: 1.30.0
 description: "Helm utils template definitions for Deckhouse modules."
diff --git a/charts/helm_lib/README.md b/charts/helm_lib/README.md
index d17d11b..c4fdb06 100644
--- a/charts/helm_lib/README.md
+++ b/charts/helm_lib/README.md
@@ -11,6 +11,8 @@
 | **High Availability** |
 | [helm_lib_is_ha_to_value](#helm_lib_is_ha_to_value) |
 | [helm_lib_ha_enabled](#helm_lib_ha_enabled) |
+| **Kind Exists** |
+| [helm_lib_kind_exists](#helm_lib_kind_exists) |
 | **Kube Rbac Proxy** |
 | [helm_lib_kube_rbac_proxy_ca_certificate](#helm_lib_kube_rbac_proxy_ca_certificate) |
 | **Module Documentation Uri** |
@@ -162,6 +164,22 @@ list:
 
 -  Template context with .Values, .Chart, etc 
 
+## Kind Exists
+
+### helm_lib_kind_exists
+
+ returns true if the specified resource kind (case-insensitive) is represented in the cluster 
+
+#### Usage
+
+`{{ include "helm_lib_kind_exists" (list . "<kind-name>") }} `
+
+#### Arguments
+
+list:
+-  Template context with .Values, .Chart, etc 
+-  Kind name portion 
+
 ## Kube Rbac Proxy
 
 ### helm_lib_kube_rbac_proxy_ca_certificate
diff --git a/charts/helm_lib/templates/_kind_exists.tpl b/charts/helm_lib/templates/_kind_exists.tpl
new file mode 100644
index 0000000..3e827df
--- /dev/null
+++ b/charts/helm_lib/templates/_kind_exists.tpl
@@ -0,0 +1,15 @@
+{{- /* Usage: {{ include "helm_lib_kind_exists" (list . "<kind-name>") }} */ -}}
+{{- /* returns true if the specified resource kind (case-insensitive) is represented in the cluster */ -}}
+{{- define "helm_lib_kind_exists" }}
+  {{- $context      := index . 0 -}} {{- /* Template context with .Values, .Chart, etc */ -}}
+  {{- $kind_name := index . 1 -}} {{- /* Kind name portion */ -}}
+  {{- if eq (len $context.Capabilities.APIVersions) 0 }}
+    {{- fail "Helm reports no capabilities" }}
+  {{- end }}
+  {{ range $cap := $context.Capabilities.APIVersions }}
+    {{- if hasSuffix (lower (printf "/%s" $kind_name)) (lower $cap) }}
+      found
+      {{- break }}
+    {{- end }}
+  {{- end }}
+{{- end -}}
diff --git a/tests/templates/helm_lib_kind_exists.yaml b/tests/templates/helm_lib_kind_exists.yaml
new file mode 100644
index 0000000..c8f15e4
--- /dev/null
+++ b/tests/templates/helm_lib_kind_exists.yaml
@@ -0,0 +1 @@
+result: {{ include "helm_lib_kind_exists" (list . "validatingadmissionpolicy") }}
diff --git a/tests/tests/helm_lib_kind_exists_test.yaml b/tests/tests/helm_lib_kind_exists_test.yaml
new file mode 100644
index 0000000..f968d94
--- /dev/null
+++ b/tests/tests/helm_lib_kind_exists_test.yaml
@@ -0,0 +1,37 @@
+suite: helm_lib_kind_exists
+templates:
+  - helm_lib_kind_exists.yaml
+tests:
+  - it: returns found for the `ValidatingAdmissionPolicy` kind
+    capabilities:
+      apiVersions:
+        - apps/v1/ValidatingAdmissionPolicy
+    asserts:
+      - equal:
+          path: "result"
+          value: "found"
+
+  - it: returns found for the `ValidatingAdmissionPolicy` kind
+    capabilities:
+      apiVersions:
+        - apps/v1/validatingadmissionpolicy
+    asserts:
+      - equal:
+          path: "result"
+          value: "found"
+
+  - it: returns "" for the `ValidatingAdmissionPolicy` kind
+    capabilities:
+      apiVersions:
+        - apps/v1/SomeOtherPolicy
+    asserts:
+      - equal:
+          path: "result"
+          value: null
+
+  - it: returns errors for empt apiVersions
+    capabilities:
+      apiVersions:
+    asserts:
+      - failedTemplate:
+          errorMessage: "Helm reports no capabilities"