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         "golang.org/x/term"
  26
  27         "ruderich.org/simon/safcm"
  28         "ruderich.org/simon/safcm/cmd/safcm-remote/ainsl"
  29         "ruderich.org/simon/safcm/cmd/safcm-remote/info"
  30         "ruderich.org/simon/safcm/cmd/safcm-remote/run"
  31         "ruderich.org/simon/safcm/cmd/safcm-remote/sync"
  32 )
  33
  34 func usage() {
  35         log.Fatalf("usage: %[1]s sync\n"+
  36                 "usage: %[1]s ainsl [options] <path> <line>",
  37                 os.Args[0])
  38 }
  39
  40 func main() {
  41         // Timestamps are added by `safcm`
  42         log.SetFlags(0)
  43
  44         if len(os.Args) < 2 {
  45                 usage()
  46         }
  47
  48         var err error
  49         switch os.Args[1] {
  50         case "sync":
  51                 if len(os.Args) != 2 {
  52                         usage()
  53                 }
  54                 err = mainLoop()
  55         case "ainsl":
  56                 err = ainsl.Main(os.Args)
  57         default:
  58                 usage()
  59         }
  60
  61         if err != nil {
  62                 log.Fatalf("%s: %v", os.Args[0], err)
  63         }
  64 }
  65
  66 func mainLoop() error {
  67         if term.IsTerminal(int(os.Stdin.Fd())) ||
  68                 term.IsTerminal(int(os.Stdout.Fd())) {
  69                 return fmt.Errorf("sync should only be called from `safcm` " +
  70                         "(redirect stdin/stdout to circumvent this check)")
  71         }
  72
  73         conn := safcm.NewGobConn(os.Stdin, os.Stdout)
  74
  75         var logLevel safcm.LogLevel
  76         logFunc := func(level safcm.LogLevel, format string, a ...interface{}) {
  77                 if logLevel >= level {
  78                         conn.Send(safcm.MsgLog{
  79                                 Level: level,
  80                                 Text:  fmt.Sprintf(format, a...),
  81                         })
  82                 }
  83         }
  84
  85         var quitResp safcm.MsgQuitResp
  86         for {
  87                 x, err := conn.Recv()
  88                 if err != nil {
  89                         return err
  90                 }
  91
  92                 var resp safcm.Msg
  93                 switch x := x.(type) {
  94                 case safcm.MsgInfoReq:
  95                         logLevel = x.LogLevel // set log level globally
  96                         resp = info.Handle(x, run.ExecRunner{}, logFunc)
  97                 case safcm.MsgSyncReq:
  98                         resp = sync.Handle(x, run.ExecRunner{}, logFunc)
  99                 case safcm.MsgQuitReq:
 100                         resp = quitResp
 101                 default:
 102                         return fmt.Errorf("unsupported message %#v", x)
 103                 }
 104
 105                 err = conn.Send(resp)
 106                 if err != nil {
 107                         return err
 108                 }
 109                 if resp == quitResp {
 110                         break
 111                 }
 112         }
 113         return nil
 114 }