X-Git-Url: https://ruderich.org/simon/gitweb/?p=nsscash%2Fnsscash.git;a=blobdiff_plain;f=main.go;h=7a7d8b0da8e6855b8545c609f6169184819db7ae;hp=50263877f2a71380b1b774e40f3984498324a8c6;hb=HEAD;hpb=92afde4e875a96e1ab865e29b9f0d11b08d7db1c

diff --git a/main.go b/main.go
index 5026387..7a7d8b0 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,6 @@
 // Main file for nsscash
 
-// Copyright (C) 2019  Simon Ruderich
+// Copyright (C) 2019-2021  Simon Ruderich
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU Affero General Public License as published by
@@ -18,32 +18,142 @@
 package main
 
 import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io/ioutil"
 	"log"
 	"os"
+	"path/filepath"
+
+	"github.com/google/renameio"
 )
 
 func main() {
-	if len(os.Args) != 2 {
-		log.SetFlags(0)
-		log.Fatalf("usage: %s <path/to/config>\n", os.Args[0])
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr,
+			"usage: %[1]s [options] fetch <config>\n"+
+				"usage: %[1]s [options] convert <type> <src> <dst>\n"+
+				"",
+			os.Args[0])
+		flag.PrintDefaults()
+	}
+	flag.Parse()
+
+	args := flag.Args()
+	if len(args) == 0 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	switch args[0] {
+	case "fetch":
+		if len(args) != 2 {
+			break
+		}
+
+		err := mainFetch(args[1])
+		if err != nil {
+			log.Fatal(err)
+		}
+		return
+
+	case "convert":
+		if len(args) != 4 {
+			break
+		}
+
+		err := mainConvert(args[1], args[2], args[3])
+		if err != nil {
+			log.Fatal(err)
+		}
+		return
 	}
 
-	cfg, err := LoadConfig(os.Args[1])
+	flag.Usage()
+	os.Exit(1)
+}
+
+func mainFetch(cfgPath string) error {
+	cfg, err := LoadConfig(cfgPath)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
 	state, err := LoadState(cfg.StatePath)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
-
 	err = handleFiles(cfg, state)
 	if err != nil {
-		log.Fatal(err)
+		return err
+	}
+	// NOTE: Make sure to call WriteState() only if there were no
+	// errors (see WriteState() and README)
+	err = WriteState(cfg.StatePath, state)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func mainConvert(typ, srcPath, dstPath string) error {
+	var t FileType
+	err := t.UnmarshalText([]byte(typ))
+	if err != nil {
+		return err
+	}
+
+	src, err := ioutil.ReadFile(srcPath)
+	if err != nil {
+		return err
+	}
+	var x bytes.Buffer
+	if t == FileTypePlain {
+		x.Write(src)
+	} else if t == FileTypePasswd {
+		pws, err := ParsePasswds(bytes.NewReader(src))
+		if err != nil {
+			return err
+		}
+		err = SerializePasswds(&x, pws)
+		if err != nil {
+			return err
+		}
+	} else if t == FileTypeGroup {
+		grs, err := ParseGroups(bytes.NewReader(src))
+		if err != nil {
+			return err
+		}
+		err = SerializeGroups(&x, grs)
+		if err != nil {
+			return err
+		}
+	} else {
+		return fmt.Errorf("unsupported file type %v", t)
+	}
+
+	// We must create the file first or deployFile() will abort; this is
+	// ugly because deployFile() already performs an atomic replacement
+	// but the simplest solution with the least duplicate code
+	f, err := renameio.TempFile(filepath.Dir(dstPath), dstPath)
+	if err != nil {
+		return err
+	}
+	defer f.Cleanup()
+
+	err = deployFile(&File{
+		Type: t,
+		Url:  srcPath,
+		Path: f.Name(),
+		body: x.Bytes(),
+	})
+	if err != nil {
+		return err
 	}
 
-	err = WriteStateIfChanged(cfg.StatePath, state)
+	err = f.CloseAtomicallyReplace()
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
+	return syncPath(filepath.Dir(dstPath))
 }