sync: rename procResume -> procHooksDone

The old name was quite confusing, and with the addition of the
procMountPlease sync message there are now multiple sync messages that
are related to "resuming" runc-init.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

libcontainer/init_linux.go

@@ -413,7 +413,7 @@ func syncParentHooks(pipe *os.File) error {
 		return err
 	}
 	// Wait for parent to give the all-clear.
-	return readSync(pipe, procResume)
+	return readSync(pipe, procHooksDone)
 }
 
 // syncParentSeccomp sends the fd associated with the seccomp file descriptor

libcontainer/process_linux.go

@@ -568,7 +568,7 @@ func (p *initProcess) start() (retErr error) {
 				}
 			}
 			// Sync with child.
-			if err := writeSync(p.messageSockPair.parent, procResume); err != nil {
+			if err := writeSync(p.messageSockPair.parent, procHooksDone); err != nil {
 				return err
 			}
 		default:

libcontainer/sync.go

@@ -23,7 +23,7 @@ type syncType string
 //	                    --- no return synchronisation
 //
 //	procHooks --> [run hooks]
-//	          <-- procResume
+//	          <-- procHooksDone
 //
 //	procReady --> [final setup]
 //	          <-- procRun
@@ -35,7 +35,7 @@ const (
 	procReady       syncType = "procReady"
 	procRun         syncType = "procRun"
 	procHooks       syncType = "procHooks"
-	procResume      syncType = "procResume"
+	procHooksDone   syncType = "procHooksDone"
 	procSeccomp     syncType = "procSeccomp"
 	procSeccompDone syncType = "procSeccompDone"
 )