add option apt_pipelining to cloud-config to address s3 mirrors (LP: #948461)

Thanks to Ben Howard.

1 files changed, 53 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/cc_apt_pipelining.py b/cloudinit/CloudConfig/cc_apt_pipelining.py
new file mode 100644
index 00000000..7ca93e66
--- /dev/null
+++ b/cloudinit/CloudConfig/cc_apt_pipelining.py
@@ -0,0 +1,53 @@
+# 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/>.
+
+import cloudinit.util as util
+from cloudinit.CloudConfig import per_instance
+
+frequency = per_instance
+default_file = "/etc/apt/apt.conf.d/90cloud-init-pipeling"
+
+
+def handle(_name, cfg, _cloud, log, _args):
+
+    apt_pipe_value = util.get_cfg_option_str(cfg, "apt_pipelining", False)
+    apt_pipe_value = str(apt_pipe_value).lower()
+
+    if apt_pipe_value == "false":
+        write_apt_snippet("0", log)
+
+    elif apt_pipe_value in ("none", "unchanged", "os"):
+        return
+
+    elif apt_pipe_value in str(range(0, 6)):
+        write_apt_snippet(apt_pipe_value, log)
+
+    else:
+        log.warn("Invalid option for apt_pipeling: %s" % apt_pipe_value)
+
+
+def write_apt_snippet(setting, log, f_name=default_file):
+    """ Writes f_name with apt pipeline depth 'setting' """
+
+    acquire_pipeline_depth = 'Acquire::http::Pipeline-Depth "%s";\n'
+    file_contents = ("//Written by cloud-init per 'apt_pipelining'\n"
+                     + (acquire_pipeline_depth % setting))
+
+    util.write_file(f_name, file_contents)
+
+    log.debug("Wrote %s with APT pipeline setting" % f_name)