Move implementation of cmd/safcm-remote/ to remote/

[safcm/safcm.git] / remote / main.go

diff --git a/remote/main.go b/remote/main.go
new file mode 100644 (file)
index 0000000..61a6237
--- /dev/null
+++ b/remote/main.go
@@ -0,0 +1,114 @@
+// Helper copied to the remote host to run commands and deploy configuration
+
+// Copyright (C) 2021  Simon Ruderich
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package remote
+
+import (
+       "fmt"
+       "log"
+       "os"
+
+       "golang.org/x/term"
+
+       "ruderich.org/simon/safcm"
+       "ruderich.org/simon/safcm/remote/ainsl"
+       "ruderich.org/simon/safcm/remote/info"
+       "ruderich.org/simon/safcm/remote/run"
+       "ruderich.org/simon/safcm/remote/sync"
+)
+
+func usage() {
+       log.Fatalf("usage: %[1]s sync\n"+
+               "usage: %[1]s ainsl [options] <path> <line>",
+               os.Args[0])
+}
+
+func Main() {
+       // Timestamps are added by `safcm`
+       log.SetFlags(0)
+
+       if len(os.Args) < 2 {
+               usage()
+       }
+
+       var err error
+       switch os.Args[1] {
+       case "sync":
+               if len(os.Args) != 2 {
+                       usage()
+               }
+               err = mainLoop()
+       case "ainsl":
+               err = ainsl.Main(os.Args)
+       default:
+               usage()
+       }
+
+       if err != nil {
+               log.Fatalf("%s: %v", os.Args[0], err)
+       }
+}
+
+func mainLoop() error {
+       if term.IsTerminal(int(os.Stdin.Fd())) ||
+               term.IsTerminal(int(os.Stdout.Fd())) {
+               return fmt.Errorf("sync should only be called from `safcm` " +
+                       "(redirect stdin/stdout to circumvent this check)")
+       }
+
+       conn := safcm.NewGobConn(os.Stdin, os.Stdout)
+
+       var logLevel safcm.LogLevel
+       logFunc := func(level safcm.LogLevel, msg string) {
+               if logLevel >= level {
+                       conn.Send(safcm.MsgLog{
+                               Level: level,
+                               Text:  msg,
+                       })
+               }
+       }
+
+       var quitResp safcm.MsgQuitResp
+       for {
+               x, err := conn.Recv()
+               if err != nil {
+                       return err
+               }
+
+               var resp safcm.Msg
+               switch x := x.(type) {
+               case safcm.MsgInfoReq:
+                       logLevel = x.LogLevel // set log level globally
+                       resp = info.Handle(x, run.ExecRunner{}, logFunc)
+               case safcm.MsgSyncReq:
+                       resp = sync.Handle(x, run.ExecRunner{}, logFunc)
+               case safcm.MsgQuitReq:
+                       resp = quitResp
+               default:
+                       return fmt.Errorf("unsupported message %#v", x)
+               }
+
+               err = conn.Send(resp)
+               if err != nil {
+                       return err
+               }
+               if resp == quitResp {
+                       break
+               }
+       }
+       return nil
+}