feat: implement check command

TODO.md

@@ -16,7 +16,7 @@
     - [x] `new`
     - [x] `backup`
     - [ ] `deploy` (WIP: decentral1se)
-    - [ ] `check` (WIP: decentral1se)
+    - [x] `check`
     - [x] `version`
     - [ ] `config`
     - [ ] `cp`

cli/app/check.go

@@ -1,7 +1,65 @@
 package app
 
-import "github.com/urfave/cli/v2"
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path"
+	"strings"
+
+	"coopcloud.tech/abra/cli/internal"
+	"coopcloud.tech/abra/config"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli/v2"
+)
 
 var appCheckCommand = &cli.Command{
 	Name:      "check",
+	ArgsUsage: "<service>",
+	Action: func(c *cli.Context) error {
+		appName := c.Args().First()
+		if appName == "" {
+			internal.ShowSubcommandHelpAndError(c, errors.New("no app name provided"))
+		}
+
+		appFiles, err := config.LoadAppFiles("")
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		appEnv, err := config.GetApp(appFiles, appName)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		envSamplePath := path.Join(config.ABRA_DIR, "apps", appEnv.Type, ".env.sample")
+		if _, err := os.Stat(envSamplePath); err != nil {
+			if os.IsNotExist(err) {
+				logrus.Fatalf("'%s' does not exist?", envSamplePath)
+			}
+			logrus.Fatal(err)
+		}
+
+		envSample, err := config.ReadEnv(envSamplePath)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		var missing []string
+		for k, _ := range envSample {
+			if _, ok := appEnv.Env[k]; !ok {
+				missing = append(missing, k)
+			}
+		}
+
+		if len(missing) > 0 {
+			path := appFiles[appName].Path
+			missingEnvVars := fmt.Sprintf(strings.Join(missing, ", "))
+			logrus.Fatalf("%s is missing %s", path, missingEnvVars)
+		}
+
+		logrus.Info("All necessary environment variables defined")
+
+		return nil
+	},
 }