1 files changed, 57 insertions, 0 deletions
diff --git a/cloudinit/config/apt_pipelining.py b/cloudinit/config/apt_pipelining.py
new file mode 100644
index 00000000..f460becb
--- /dev/null
+++ b/cloudinit/config/apt_pipelining.py
@@ -0,0 +1,57 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2011 Canonical Ltd.
+#
+#    Author: Ben Howard <ben.howard@canonical.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License version 3, as
+#    published by the Free Software Foundation.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from cloudinit import util
+from cloudinit.settings import PER_INSTANCE
+
+frequency = PER_INSTANCE
+
+distros = ['ubuntu', 'debian']
+
+DEFAULT_FILE = "/etc/apt/apt.conf.d/90cloud-init-pipelining"
+
+# Acquire::http::Pipeline-Depth can be a value
+# from 0 to 5 indicating how many outstanding requests APT should send.
+# A value of zero MUST be specified if the remote host does not properly linger
+# on TCP connections - otherwise data corruption will occur.
+
+
+def handle(_name, cfg, cloud, log, _args):
+
+    apt_pipe_value = util.get_cfg_option_str(cfg, "apt_pipelining", False)
+    apt_pipe_value_s = str(apt_pipe_value).lower().strip()
+
+    if apt_pipe_value_s == "false":
+        write_apt_snippet(cloud, "0", log, DEFAULT_FILE)
+    elif apt_pipe_value_s in ("none", "unchanged", "os"):
+        return
+    elif apt_pipe_value_s in [str(b) for b in xrange(0, 6)]:
+        write_apt_snippet(cloud, apt_pipe_value_s, log, DEFAULT_FILE)
+    else:
+        log.warn("Invalid option for apt_pipeling: %s", apt_pipe_value)
+
+
+def write_apt_snippet(cloud, setting, log, f_name):
+    """ Writes f_name with apt pipeline depth 'setting' """
+
+    file_contents = ("//Written by cloud-init per 'apt_pipelining'\n"
+                     'Acquire::http::Pipeline-Depth "%s";\n') % (setting)
+
+    util.write_file(cloud.paths.join(False, f_name), file_contents)
+
+    log.debug("Wrote %s with apt pipeline depth setting %s", f_name, setting)