WIP: sandbox/_sandboxremote.py: Implement command batching

buildstream/sandbox/_sandboxremote.py

@@ -19,6 +19,7 @@
 #        Jim MacArthur <jim.macarthur@codethink.co.uk>
 
 import os
+import shlex
 from urllib.parse import urlparse
 
 import grpc
@@ -227,3 +228,38 @@ class SandboxRemote(Sandbox):
         self.process_job_output(action_result.output_directories, action_result.output_files)
 
         return 0
+
+    def run_queue(self, flags, *, cwd=None, env=None):
+        queue = self._queue
+        self._queue = []
+
+        script = ""
+        i = 0
+        for entry in queue:
+            cmdline = ' '.join(shlex.quote(cmd) for cmd in entry.command)
+            script += "({})\n".format(cmdline)
+            script += "RETVAL=$?\n"
+            script += "if [ $RETVAL -ne 0 ] ; then\n"
+            # Report failing command and exit code to stderr (and then back to client)
+            script += "  echo -e '\nbst-command-failure:' {} $RETVAL >&2\n".format(i)
+            script += "  exit 1\n"
+            script += "fi\n"
+            i += 1
+
+        exit_code = self.run(['sh', '-c', script], flags, cwd=cwd, env=env)
+
+        if exit_code != 0:
+            # TODO get failed command and exit code from stderr
+            failed_command = 0
+            command_exit_code = 1
+
+        i = 0
+        for entry in queue:
+            entry.start_callback()
+            if exit_code == 0 or i < failed_command:
+                # Command succeeded
+                entry.complete_callback(0)
+            else:
+                # Command failed
+                entry.complete_callback(command_exit_code)
+                break