Initial commit

.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

Chart.yaml

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+apiVersion: v2
+name: example
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"

README.md

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+# Demonstrating a helm bug
+
+- kubectl apply -f crd.yaml
+- helm upgrade example --install . 
+```
+❯ helm upgrade example --install . 
+Release "example" does not exist. Installing it now.
+NAME: example
+LAST DEPLOYED: Wed Oct  6 10:43:23 2021
+NAMESPACE: default
+STATUS: deployed
+REVISION: 1
+TEST SUITE: None
+```
+
+- edit [templates/instance1.yaml](templates/instance1.yaml) to be `spec.name=invalid`, and remove [templates/instance2.yaml](templates/instance2.yaml) from the chart
+- helm upgrade example --install . 
+
+```
+❯ helm upgrade example --install . 
+Error: UPGRADE FAILED: cannot patch "example1" with kind Example: Example.stono.io "example1" is invalid: spec.name: Invalid value: "": spec.name in body should match '^valid$'
+```
+
+- Attempt to (but unable to) roll back to previous release:
+```
+❯ helm rollback example 1
+Error: no Example with the name "example2" found
+```

crd.yaml

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+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  labels:
+    app: example 
+  name: examples.stono.io
+spec:
+  conversion:
+    strategy: None
+  group: stono.io
+  names:
+    kind: Example
+    listKind: ExampleList
+    plural: examples
+    singular: example
+  scope: Namespaced
+  versions:
+  - name: v1
+    schema:
+      openAPIV3Schema:
+        type: object
+        properties:
+          spec:
+            type: object
+            properties:
+              name:
+                type: string
+                pattern: '^valid$'
+    served: true
+    storage: true

templates/instance1.yaml

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+apiVersion: stono.io/v1
+kind: Example
+metadata:
+  name: example1 
+  namespace: default 
+spec:
+  name: valid 

templates/instance2.yaml

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+apiVersion: stono.io/v1
+kind: Example
+metadata:
+  name: example2
+  namespace: default 
+spec:
+  name: valid