feat(cmp): Print stderr output from command even on success (#15921) (#…

…15973) * feat(cmp): Print stderr output from command even on success Signed-off-by: Mathias Petermann <[email protected]> * docs(cmp): Document logging from cmp sidecard for development purposes Signed-off-by: Mathias Petermann <[email protected]> --------- Signed-off-by: Mathias Petermann <[email protected]>
argoproj · Oct 23, 2023 · 752004c · 752004c
1 parent 20618b4
commit 752004c
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Showing 2 changed files with 11 additions and 4 deletions.
diff --git a/cmpserver/plugin/plugin.go b/cmpserver/plugin/plugin.go
@@ -120,11 +120,16 @@ func runCommand(ctx context.Context, command Command, path string, env []string)
 		logCtx.Error(err.Error())
 		return strings.TrimSuffix(output, "\n"), err
 	}
+
+	logCtx = logCtx.WithFields(log.Fields{
+		"stderr":  stderr.String(),
+		"command": command,
+	})
 	if len(output) == 0 {
-		log.WithFields(log.Fields{
-			"stderr":  stderr.String(),
-			"command": command,
-		}).Warn("Plugin command returned zero output")
+		logCtx.Warn("Plugin command returned zero output")
+	} else {
+		// Log stderr even on successfull commands to help develop plugins
+		logCtx.Info("Plugin command successfull")
 	}
 
 	return strings.TrimSuffix(output, "\n"), nil

diff --git a/docs/operator-manual/config-management-plugins.md b/docs/operator-manual/config-management-plugins.md
@@ -44,6 +44,7 @@ spec:
     args: [-c, 'echo "Initializing..."']
   # The generate command runs in the Application source directory each time manifests are generated. Standard output
   # must be ONLY valid Kubernetes Objects in either YAML or JSON. A non-zero exit code will fail manifest generation.
+  # To write log messages from the command, write them to stderr, it will always be displayed.
   # Error output will be sent to the UI, so avoid printing sensitive information (such as secrets).
   generate:
     command: [sh, -c]
@@ -333,6 +334,7 @@ If you are actively developing a sidecar-installed CMP, keep a few things in min
 3. CMP errors are cached by the repo-server in Redis. Restarting the repo-server Pod will not clear the cache. Always
    do a "Hard Refresh" when actively developing a CMP so you have the latest output.
 4. Verify your sidecar has started properly by viewing the Pod and seeing that two containers are running `kubectl get pod -l app.kubernetes.io/component=repo-server -n argocd`
+5. Write log message to stderr and set the `--loglevel=info` flag in the sidecar. This will print everything written to stderr, even on successfull command execution.
 
 
 ### Other Common Errors