cmd/safcm-remote/main.go

   1 // Helper copied to the remote hosts to run commands and deploy configuration
   2
   3 // Copyright (C) 2021  Simon Ruderich
   4 //
   5 // This program is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 package main
  19
  20 import (
  21         "fmt"
  22         "log"
  23         "os"
  24
  25         "ruderich.org/simon/safcm"
  26         "ruderich.org/simon/safcm/cmd/safcm-remote/ainsl"
  27         "ruderich.org/simon/safcm/cmd/safcm-remote/info"
  28         "ruderich.org/simon/safcm/cmd/safcm-remote/run"
  29         "ruderich.org/simon/safcm/cmd/safcm-remote/sync"
  30 )
  31
  32 func usage() {
  33         log.Fatalf("usage: %[1]s sync\n"+
  34                 "usage: %[1]s ainsl [options] <path> <line>",
  35                 os.Args[0])
  36 }
  37
  38 func main() {
  39         // Timestamps are added by `safcm`
  40         log.SetFlags(0)
  41
  42         if len(os.Args) < 2 {
  43                 usage()
  44         }
  45
  46         var err error
  47         switch os.Args[1] {
  48         case "sync":
  49                 if len(os.Args) != 2 {
  50                         usage()
  51                 }
  52                 err = mainLoop()
  53         case "ainsl":
  54                 err = ainsl.Main(os.Args)
  55         default:
  56                 usage()
  57         }
  58
  59         if err != nil {
  60                 log.Fatalf("%s: %v", os.Args[0], err)
  61         }
  62 }
  63
  64 func mainLoop() error {
  65         conn := safcm.NewGobConn(os.Stdin, os.Stdout)
  66
  67         var logLevel safcm.LogLevel
  68         logFunc := func(level safcm.LogLevel, format string, a ...interface{}) {
  69                 if logLevel >= level {
  70                         conn.Send(safcm.MsgLog{
  71                                 Level: level,
  72                                 Text:  fmt.Sprintf(format, a...),
  73                         })
  74                 }
  75         }
  76
  77         var quitResp safcm.MsgQuitResp
  78         for {
  79                 x, err := conn.Recv()
  80                 if err != nil {
  81                         return err
  82                 }
  83
  84                 var resp safcm.Msg
  85                 switch x := x.(type) {
  86                 case safcm.MsgInfoReq:
  87                         logLevel = x.LogLevel // set log level globally
  88                         resp = info.Handle(x, run.ExecRunner{}, logFunc)
  89                 case safcm.MsgSyncReq:
  90                         resp = sync.Handle(x, run.ExecRunner{}, logFunc)
  91                 case safcm.MsgQuitReq:
  92                         resp = quitResp
  93                 default:
  94                         return fmt.Errorf("unsupported message %#v", x)
  95                 }
  96
  97                 err = conn.Send(resp)
  98                 if err != nil {
  99                         return err
 100                 }
 101                 if resp == quitResp {
 102                         break
 103                 }
 104         }
 105         return nil
 106 }