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mitogen-0.3.9/mitogen/lxc.py

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+# Copyright 2019, David Wilson
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors
+# may be used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+# !mitogen: minify_safe
+
+import mitogen.parent
+
+
+class Options(mitogen.parent.Options):
+    container = None
+    lxc_attach_path = 'lxc-attach'
+
+    def __init__(self, container, lxc_attach_path=None, **kwargs):
+        super(Options, self).__init__(**kwargs)
+        self.container = container
+        if lxc_attach_path:
+            self.lxc_attach_path = lxc_attach_path
+
+
+class Connection(mitogen.parent.Connection):
+    options_class = Options
+
+    child_is_immediate_subprocess = False
+    create_child_args = {
+        # If lxc-attach finds any of stdin, stdout, stderr connected to a TTY,
+        # to prevent input injection it creates a proxy pty, forcing all IO to
+        # be buffered in <4KiB chunks. So ensure stderr is also routed to the
+        # socketpair.
+        'merge_stdio': True
+    }
+
+    eof_error_hint = (
+        'Note: many versions of LXC do not report program execution failure '
+        'meaningfully. Please check the host logs (/var/log) for more '
+        'information.'
+    )
+
+    def _get_name(self):
+        return u'lxc.' + self.options.container
+
+    def get_boot_command(self):
+        bits = [
+            self.options.lxc_attach_path,
+            '--clear-env',
+            '--name', self.options.container,
+            '--',
+        ]
+        return bits + super(Connection, self).get_boot_command()