Add cmdline arg to initialize a default config

[rbdr/mobius] / cmd / mobius-hotline-server / main.go

diff --git a/cmd/mobius-hotline-server/main.go b/cmd/mobius-hotline-server/main.go
index 8a3135ebbabd8fbb1ff7f0c3b6c351e35c9c4453..cf3c5a974672edd4b486f871cd7c58f6e626a0c0 100644 (file)
--- a/cmd/mobius-hotline-server/main.go
+++ b/cmd/mobius-hotline-server/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
        "context"
+       "embed"
        "encoding/json"
        "flag"
        "fmt"
@@ -17,6 +18,9 @@ import (
        "time"
 )
 
+//go:embed mobius/config
+var cfgTemplate embed.FS
+
 const (
        defaultPort = 5500
 )
@@ -31,6 +35,8 @@ func main() {
        configDir := flag.String("config", defaultConfigPath(), "Path to config root")
        version := flag.Bool("version", false, "print version and exit")
        logLevel := flag.String("log-level", "info", "Log level")
+       init := flag.Bool("init", false, "Populate the config dir with default configuration")
+
        flag.Parse()
 
        if *version {
@@ -49,6 +55,20 @@ func main() {
        defer func() { _ = l.Sync() }()
        logger := l.Sugar()
 
+       if *init {
+               if _, err := os.Stat(*configDir + "/config.yaml"); !os.IsNotExist(err) {
+                       logger.Fatalw("Init failed.  Existing config directory found: " + *configDir)
+               }
+
+               if err := os.MkdirAll(*configDir, 0750); err != nil {
+                       logger.Fatal(err)
+               }
+
+               if err := copyDir("mobius/config", *configDir); err != nil {
+                       logger.Fatal(err)
+               }
+       }
+
        if _, err := os.Stat(*configDir); os.IsNotExist(err) {
                logger.Fatalw("Configuration directory not found", "path", configDir)
        }
@@ -125,3 +145,53 @@ func defaultConfigPath() (cfgPath string) {
 
        return cfgPath
 }
+
+// TODO: Simplify this mess.  Why is it so difficult to recursively copy a directory?
+func copyDir(src, dst string) error {
+       entries, err := cfgTemplate.ReadDir(src)
+       if err != nil {
+               return err
+       }
+       for _, dirEntry := range entries {
+               if dirEntry.IsDir() {
+                       if err := os.MkdirAll(dst+"/"+dirEntry.Name(), 0777); err != nil {
+                               panic(err)
+                       }
+                       subdirEntries, _ := cfgTemplate.ReadDir(src + "/" + dirEntry.Name())
+                       for _, subDirEntry := range subdirEntries {
+                               f, err := os.Create(dst + "/" + dirEntry.Name() + "/" + subDirEntry.Name())
+                               if err != nil {
+                                       return err
+                               }
+
+                               srcFile, err := cfgTemplate.Open(src + "/" + dirEntry.Name() + "/" + subDirEntry.Name())
+                               if err != nil {
+                                       return err
+                               }
+                               _, err = io.Copy(f, srcFile)
+                               if err != nil {
+                                       return err
+                               }
+                               f.Close()
+                       }
+               } else {
+                       f, err := os.Create(dst + "/" + dirEntry.Name())
+                       if err != nil {
+                               return err
+                       }
+
+                       srcFile, err := cfgTemplate.Open(src + "/" + dirEntry.Name())
+                       if err != nil {
+                               return err
+                       }
+                       _, err = io.Copy(f, srcFile)
+                       if err != nil {
+                               return err
+                       }
+                       f.Close()
+               }
+
+       }
+
+       return nil
+}