feat: Support floating tag in product image selection

Cargo.toml

@@ -10,7 +10,7 @@ edition = "2024"
 repository = "https://github.com/stackabletech/zookeeper-operator"
 
 [workspace.dependencies]
-stackable-operator = { git = "https://github.com/stackabletech/operator-rs.git", tag = "stackable-operator-0.116.0", features = ["webhook"] }
+stackable-operator = { git = "https://github.com/stackabletech/operator-rs.git", tag = "stackable-operator-0.118.0", features = ["webhook"] }
 
 anyhow = "1.0"
 built = { version = "0.8", features = ["chrono", "git2"] }

extra/crds.yaml

@@ -160,12 +160,13 @@ spec:
                     description: Version of the product, e.g. `1.4.1`.
                     type: string
                   pullPolicy:
-                    default: Always
                     description: '[Pull policy](https://kubernetes.io/docs/concepts/containers/images/#image-pull-policy) used when pulling the image.'
                     enum:
                     - IfNotPresent
                     - Always
                     - Never
+                    - null
+                    nullable: true
                     type: string
                   pullSecrets:
                     description: '[Image pull secrets](https://kubernetes.io/docs/concepts/containers/images/#specifying-imagepullsecrets-on-a-pod) to pull images from a private registry.'
@@ -191,12 +192,47 @@ spec:
                     type: string
                   stackableVersion:
                     description: |-
-                      Stackable version of the product, e.g. `23.4`, `23.4.1` or `0.0.0-dev`.
+                      Stackable version of the product, e.g. `26.7.0` or `0.0.0-dev`.
 
-                      If not specified, the operator will use its own version, e.g. `23.4.1`. When using a nightly
+                      If not specified, the operator will use its own version, e.g. `26.7.1`. When using a nightly
                       operator or a PR version, it will use the nightly `0.0.0-dev` image.
+
+                      If this is used in combination with `stackableVersionPolicy: LatestPatch`, the correct
+                      floating tag is computed automatically, e.g. `26.7.0` becomes `26.7` for the product image.
                     nullable: true
                     type: string
+                  stackableVersionPolicy:
+                    default: Exact
+                    description: |-
+                      Configure the Stackable version policy. Defaults to `Exact`.
+
+                      Currently, two variants are supported:
+
+                      - `Exact`, which uses the exact, fully-qualified, canonical version of a product image.
+                      - `LatestPatch`, referencing a floating tag which always points to the latest patch version
+                        in the current release line. The current release line is either automatically derived by
+                        the operator based on its own version, or can be overridden with `stackableVersion`.
+
+                      A potential newer image is only pulled when Pods are rotated or their containers are
+                      restarted. Pods are NOT rotated and containers are NOT restarted automatically when a new
+                      image is available. This behaviour makes this a passive update mechanism, rather than an
+                      active one.
+
+                      It should be noted that when this field is set to `LatestPatch`, the operator automatically
+                      uses `Always` as the pull policy for product images. If set to `Exact`, `IfNotPresent` is
+                      used. Explicitly setting `pullPolicy` takes precedence.
+
+                      ### Examples
+
+                      - The `stackableVersion` field is not set, the operator falls back to its own version, eg.
+                        26.7.0. If this field is set to `LatestPatch`, the `26.7` floating tag will be used for
+                        product images, else, `26.7.0` will be used.
+                      - The `stackableVersion` field is set to `26.3.0`. If this field is set to `LatestPatch`,
+                        the `26.3` floating tag will be used for product images, else, `26.3.0` will be used.
+                    enum:
+                    - Exact
+                    - LatestPatch
+                    type: string
                 type: object
               objectOverrides:
                 default: []

rust/operator-binary/src/main.rs

@@ -50,7 +50,14 @@ mod zk_controller;
 mod znode_controller;
 
 mod built_info {
+    use std::{str::FromStr, sync::LazyLock};
+
     include!(concat!(env!("OUT_DIR"), "/built.rs"));
+
+    pub static PKG_VERSION_SEMVER: LazyLock<semver::Version> = LazyLock::new(|| {
+        semver::Version::from_str(PKG_VERSION)
+            .expect("PKG_VERSION must be able to be parsed as semver")
+    });
 }
 
 #[derive(clap::Parser)]

rust/operator-binary/src/zk_controller/validate.rs

@@ -377,7 +377,7 @@ pub fn validate(
         .resolve(
             CONTAINER_IMAGE_BASE_NAME,
             &operator_environment.image_repository,
-            crate::built_info::PKG_VERSION,
+            &crate::built_info::PKG_VERSION_SEMVER,
         )
         .context(ResolveProductImageSnafu)?;