hosts: mostly implement Host.Run()

hosts/hosts.go

@@ -1,5 +1,13 @@
 package hosts
 
+import (
+  "errors"
+  "fmt"
+  "os"
+  "os/exec"
+  "path/filepath"
+)
+
 // a host is a name and an address
 // memnarch expects an SSH private key to connect to Addr to exist at MEMNARCH_HOSTS/Name
 
@@ -12,6 +20,27 @@ type RemoteMachine interface {
   Run(...string) error
 }
 
-func (*Host) Run(cmdArgs ...string) error {
+func (self *Host) Run(cmdArgs ...string) error {
+  // make sure keyfile exists
+  keysDir := os.Getenv("MEMNARCH_HOSTS")
+  keyfile := filepath.Join(keysDir, self.Name)
+  info, err := os.Stat(keyfile)
+  if (err != nil) {
+    return err
+  }
+  if (info.IsDir()) {
+    return errors.New("supposed keyfile is actually a directory")
+  }
+  // ssh in
+  completeArgs := append([]string{"-i", keyfile, "memnarch@"+self.Addr}, cmdArgs...)
+  sshCmd := exec.Command("ssh", completeArgs...)
+  output, err := sshCmd.CombinedOutput()
+  // TODO: log the metadata
+  fmt.Println(output)
+  // if error, return it
+  if err != nil {
+    return err
+  }
+  // otherwise...
   return nil
 }