Disable CSR utilities on K8s <1.19

Fixes #816

kube-client/src/api/util/csr.rs

@@ -0,0 +1,26 @@
+use crate::{api::Api, Error, Result};
+use k8s_openapi::api::certificates::v1::CertificateSigningRequest;
+use kube_core::params::{Patch, PatchParams};
+
+
+impl Api<CertificateSigningRequest> {
+    /// Partially update approval of the specified CertificateSigningRequest.
+    pub async fn patch_approval<P: serde::Serialize>(
+        &self,
+        name: &str,
+        pp: &PatchParams,
+        patch: &Patch<P>,
+    ) -> Result<CertificateSigningRequest> {
+        let mut req = self
+            .request
+            .patch_subresource("approval", name, pp, patch)
+            .map_err(Error::BuildRequest)?;
+        req.extensions_mut().insert("approval");
+        self.client.request::<CertificateSigningRequest>(req).await
+    }
+
+    /// Get the CertificateSigningRequest. May differ from get(name)
+    pub async fn get_approval(&self, name: &str) -> Result<CertificateSigningRequest> {
+        self.get_subresource("approval", name).await
+    }
+}

kube-client/src/api/util.rs → kube-client/src/api/util/mod.rs

@@ -2,13 +2,14 @@ use crate::{
     api::{Api, Resource},
     Error, Result,
 };
-use k8s_openapi::api::{certificates::v1::CertificateSigningRequest, core::v1::Node};
-use kube_core::{
-    params::{Patch, PatchParams},
-    util::Restart,
-};
+use k8s_openapi::api::core::v1::Node;
+use kube_core::util::Restart;
 use serde::de::DeserializeOwned;
 
+k8s_openapi::k8s_if_ge_1_19! {
+    mod csr;
+}
+
 impl<K> Api<K>
 where
     K: Restart + Resource + DeserializeOwned,
@@ -37,28 +38,6 @@ impl Api<Node> {
     }
 }
 
-impl Api<CertificateSigningRequest> {
-    /// Partially update approval of the specified CertificateSigningRequest.
-    pub async fn patch_approval<P: serde::Serialize>(
-        &self,
-        name: &str,
-        pp: &PatchParams,
-        patch: &Patch<P>,
-    ) -> Result<CertificateSigningRequest> {
-        let mut req = self
-            .request
-            .patch_subresource("approval", name, pp, patch)
-            .map_err(Error::BuildRequest)?;
-        req.extensions_mut().insert("approval");
-        self.client.request::<CertificateSigningRequest>(req).await
-    }
-
-    /// Get the CertificateSigningRequest. May differ from get(name)
-    pub async fn get_approval(&self, name: &str) -> Result<CertificateSigningRequest> {
-        self.get_subresource("approval", name).await
-    }
-}
-
 // Tests that require a cluster and the complete feature set
 // Can be run with `cargo test -p kube-client --lib -- --ignored`
 #[cfg(test)]