fix: kustomize plugin fails with deprecation warnings (#728)

SUMMARY

error judgments are based on the exit codes of command execution, where 0 represents success and non-zero represents failure.
Optimize the run_command function to return a tuple like the run_command method of AnsibleModule.

Fixes #639
ISSUE TYPE

Bugfix Pull Request

COMPONENT NAME

kustomize lookup plugin
ADDITIONAL INFORMATION

Reviewed-by: Mike Graves <mgraves@redhat.com>
Reviewed-by: QCU
(cherry picked from commit 5bc53db)

changelogs/fragments/20240620-fix-kustomize-plugin-fails-with-deprecation-warnings.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - kustomize - kustomize plugin fails with deprecation warnings (https://github.com/ansible-collections/kubernetes.core/issues/639).

plugins/lookup/kustomize.py

@@ -94,7 +94,8 @@ def get_binary_from_path(name, opt_dirs=None):
 
 def run_command(command):
     cmd = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-    return cmd.communicate()
+    stdout, stderr = cmd.communicate()
+    return cmd.returncode, stdout, stderr
 
 
 class LookupModule(LookupBase):
@@ -140,9 +141,18 @@ def run(
         if enable_helm:
             command += ["--enable-helm"]
 
-        (out, err) = run_command(command)
-        if err:
-            raise AnsibleLookupError(
-                "kustomize command failed with: {0}".format(err.decode("utf-8"))
-            )
+        (ret, out, err) = run_command(command)
+        if ret != 0:
+            if err:
+                raise AnsibleLookupError(
+                    "kustomize command failed. exit code: {0}, error: {1}".format(
+                        ret, err.decode("utf-8")
+                    )
+                )
+            else:
+                raise AnsibleLookupError(
+                    "kustomize command failed with unknown error. exit code: {0}".format(
+                        ret
+                    )
+                )
         return [out.decode("utf-8")]