feat: add basic support for nix flakes (#21)

This adds a reproducible build environment for Argo Workflows. Argo
Workflows can now be run in a few simple steps documented in the
README.md.

Why are there some go files changed here?
This was the outcome of running gofmt on the sources, sources can be
reformatted by running "nix fmt".
Currently this only supports formatting golang and nix files but can be
extended to anything supported via clang-format, prettier and more. See
this for more info: https://numtide.github.io/treefmt/formatters/

The files.go stub was added, this is a bit more deterministic than
copying at build time. This will also make caching easier.

---------

Signed-off-by: Isitha Subasinghe <[email protected]>

.gitignore

@@ -45,3 +45,6 @@ sdks/python/client/dist/*
 manifests/install.yaml
 manifests/namespace-install.yaml
 /logs
+node_modules 
+result
+.devenv

README.md

@@ -45,6 +45,19 @@ Argo is a [Cloud Native Computing Foundation (CNCF)](https://cncf.io/) hosted pr
 
 ![Screenshot](docs/assets/screenshot.png)
 
+## Try Argo using Nix
+Nix is a package manager / build tool which focusses on reproducible build environments.
+Argo Workflows has some basic support for Nix which is enough to get Argo Workflows up and running with minimal effort. 
+Here are the steps to follow: 
+  1. Modify the hosts file according to [this](https://argoproj.github.io/argo-workflows/running-locally/), don't worry about the other instructions. 
+  2. Setup a k8s cluster, k3d is the recommended solution here. 
+  3. Install [Nix](https://nixos.org/download.html).
+  4. Make a directory in the argo workflows folder called ".devenv".
+  5. Run "nix develop --extra-experimental-features nix-command --extra-experimental-features flakes" (you can add this as a default in your nix.conf file).
+  6. Run "devenv up". 
+
+As I said, this is still fairly barebones at the moment, any feature in the Makefile not mentioned here is excluded at the moment. 
+In practice this means only a "make start UI=true" equivalent is supported at the moment, there are no LDFlags set in the build, so the UI will show something similar to "0.0.0-unknown"
 ## Documentation
 
 [View the docs](https://argoproj.github.io/argo-workflows/)

conf.nix

@@ -0,0 +1,50 @@
+rec {
+  staticFiles = true;
+  version = "latest";
+  env = {
+    DEFAULT_REQUEUE_TIME = "1s";
+    SECURE = "false";
+    ALWAYS_OFFLOAD_NODE_STATUS = "false";
+    LOG_LEVEL = "debug";
+    UPPERIO_DB_DEBUG = "0";
+    IMAGE_NAMESPACE = "quay.io/pipekitdev";
+    VERSION = "${version}";
+    AUTH_MODE = "hybrid";
+    NAMESPACED = "true";
+    KUBE_NAMESPACE = "argo";
+    NAMESPACE = "${env.KUBE_NAMESPACE}";
+    MANAGED_NAMESPACE = "${env.KUBE_NAMESPACE}"; # same as kubeNamespace
+    CTRL = "true";
+    LOGS = "true"; # same as CTRL - not acted upon
+    UI = "true"; # same as CTRL
+    API = "true"; # same as CTRL
+    PLUGINS = "false";
+  };
+  controller = {
+    env = {
+      CTRL = "${env.CTRL}";
+      ARGO_EXECUTOR_PLUGINS = "${env.PLUGINS}";
+      ARGO_REMOVE_PVC_PROTECTION_FINALIZER = "true";
+      ARGO_PROGRESS_PATCH_TICK_DURATION = "7s";
+      DEFAULT_REQUEUE_TIME = "${env.DEFAULT_REQUEUE_TIME}";
+      LEADER_ELECTION_IDENTITY = "local";
+      ALWAYS_OFFLOAD_NODE_STATUS = "${env.ALWAYS_OFFLOAD_NODE_STATUS}";
+      OFFLOAD_NODE_STATUS_TTL = "30s";
+      WORKFLOW_GC_PERIOD = "30s";
+      UPPERIO_DB_DEBUG = "${env.UPPERIO_DB_DEBUG}";
+      ARCHIVED_WORKFLOW_GC_PERIOD = "30s";
+    };
+    args = "--executor-image ${env.IMAGE_NAMESPACE}/argoexec:${env.VERSION} --namespaced=${env.NAMESPACED} --managed-namespace=${env.MANAGED_NAMESPACE} --loglevel ${env.LOG_LEVEL}";
+  };
+
+  argoServer = {
+    env = {
+      UPPERIO_DB_DEBUG = "${env.UPPERIO_DB_DEBUG}";
+    };
+    args = "--loglevel ${env.LOG_LEVEL} server --namespaced=${env.NAMESPACED} --auth-mode ${env.AUTH_MODE} --secure=${env.SECURE} --x-frame-options=SAMEORIGIN";
+  };
+  ui = {
+    env = { };
+    args = "--cwd ui start";
+  };
+}

examples/validator.go

@@ -4,8 +4,8 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"strings"
 	"path/filepath"
+	"strings"
 
 	"github.com/xeipuuv/gojsonschema"
 	"sigs.k8s.io/yaml"
@@ -75,7 +75,7 @@ func ValidateArgoYamlRecursively(fromPath string, skipFileNames []string) (map[s
 					errorDescriptions = append(errorDescriptions, fmt.Sprintf("%s in %s", err.Description(), err.Context().String()))
 				}
 			}
-			
+
 			if !(incorrectError && len(errorDescriptions) == 1) {
 				failed[path] = errorDescriptions
 			}