93e1c60460
Introduce an osbuild API that can be used by the container to talk to the osbuild host. It currently supports one method 'setup-stdio' which should be used by the container to setup its standard input/ output so the stages can transparently do i/o with the osbuild host via stdio. The input data (args) is written to a temp-file backed buffer. The output is either the host's stdout directly or another temp-file backed buffer; the latter is re-opened (via /proc/self/fd) to get another file-descriptor for the container, so in theory the host and the container could do i/o to the same buffer independently.
75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
import array
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import asyncio
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import json
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import os
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import tempfile
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import threading
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import sys
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from . import remoteloop
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class API:
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def __init__(self, sock, args, interactive):
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self.sock = sock
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self.input = args
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self.interactive = interactive
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self._output = None
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self.event_loop = asyncio.new_event_loop()
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self.event_loop.add_reader(self.sock, self._dispatch)
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self.thread = threading.Thread(target=self._run_event_loop)
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@property
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def output(self):
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return self._output and self._output.read()
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def _prepare_input(self):
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with tempfile.TemporaryFile() as fd:
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fd.write(json.dumps(self.input).encode('utf-8'))
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# re-open the file to get a read-only file descriptor
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return open(f"/proc/self/fd/{fd.fileno()}", "r")
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def _prepare_output(self):
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if self.interactive:
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return os.fdopen(os.dup(sys.stdout.fileno()), 'w')
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out = tempfile.TemporaryFile(mode="wb")
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fd = os.open(f"/proc/self/fd/{out.fileno()}", os.O_RDONLY|os.O_CLOEXEC)
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self._output = os.fdopen(fd)
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return out
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def _setup_stdio(self, addr):
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with self._prepare_input() as stdin, \
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self._prepare_output() as stdout:
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msg = {}
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fds = array.array("i")
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fds.append(stdin.fileno())
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msg['stdin'] = 0
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fds.append(stdout.fileno())
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msg['stdout'] = 1
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fds.append(stdout.fileno())
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msg['stderr'] = 2
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remoteloop.dump_fds(self.sock, msg, fds, addr=addr)
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def __del__(self):
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self.sock.close()
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def _dispatch(self):
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msg, addr = self.sock.recvfrom(1024)
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args = json.loads(msg)
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if args["method"] == 'setup-stdio':
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self._setup_stdio(addr)
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def _run_event_loop(self):
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# Set the thread-local event loop
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asyncio.set_event_loop(self.event_loop)
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# Run event loop until stopped
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self.event_loop.run_forever()
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def __enter__(self):
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self.thread.start()
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return self
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def __exit__(self, *args):
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self.event_loop.call_soon_threadsafe(self.event_loop.stop)
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self.thread.join()
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