Colin Watson has proposed merging 
lp:~cjwatson/launchpad/external-dependencies-trusted into lp:launchpad.

Commit message:
Accept and ignore options (e.g. "[trusted=yes]") in sources.list lines passed 
via external_dependencies.

Requested reviews:
  Launchpad code reviewers (launchpad-reviewers)

For more details, see:
https://code.launchpad.net/~cjwatson/launchpad/external-dependencies-trusted/+merge/331490

We need this to tolerate builder chroots without allow-unauthenticated 
configuration: the external archive that we use for bootstrapping packages with 
circular dependencies is unsigned.

I considered more careful non-regex-based parsing, but I don't think it's worth 
the effort as this is just a preliminary scan for errors before handing it off 
to the builder.
-- 
Your team Launchpad code reviewers is requested to review the proposed merge of 
lp:~cjwatson/launchpad/external-dependencies-trusted into lp:launchpad.
=== modified file 'lib/lp/soyuz/browser/tests/archive-views.txt'
--- lib/lp/soyuz/browser/tests/archive-views.txt	2016-01-26 15:47:37 +0000
+++ lib/lp/soyuz/browser/tests/archive-views.txt	2017-09-28 14:31:29 +0000
@@ -1490,3 +1490,12 @@
     ...     "deb http://example.com/ karmic universe\n"
     ...     "deb example.com/ karmic main")
     ['deb example.com/ karmic main: Invalid URL']
+
+Options are permitted:
+
+    >>> print validate_external_dependencies(
+    ...     "deb [trusted=yes] http://example.com/ karmic main")
+    []
+    >>> print validate_external_dependencies(
+    ...     "deb [trusted=yes] example.com/ karmic main")
+    ['deb [trusted=yes] example.com/ karmic main: Invalid URL']

=== modified file 'lib/lp/soyuz/interfaces/archive.py'
--- lib/lp/soyuz/interfaces/archive.py	2017-06-26 09:54:51 +0000
+++ lib/lp/soyuz/interfaces/archive.py	2017-09-28 14:31:29 +0000
@@ -55,6 +55,7 @@
     ]
 
 import httplib
+import re
 from urlparse import urlparse
 
 from lazr.restful.declarations import (
@@ -2468,8 +2469,9 @@
     # The field can consist of multiple entries separated by
     # newlines, so process each in turn.
     for dep in ext_deps.splitlines():
+        dep_without_options = re.sub(r"^([^ ]*) \[[^]]*\] ", r"\1 ", dep)
         try:
-            deb, url, suite, components = dep.split(" ", 3)
+            deb, url, suite, components = dep_without_options.split(" ", 3)
         except ValueError:
             errors.append(
                 "'%s' is not a complete and valid sources.list entry"

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