pkgin: Support multiple matching packages

pkgin searches for packages such as 'emacs' can return multiple matches,
the first of which is not guaranteed to match.  So, iterate through
found packages until we have an appropriate match.  Should we *not* find
a match, then return False indicating match failure.

packaging/os/pkgin.py

@@ -68,6 +68,7 @@ import shlex
 import os
 import sys
 import pipes
+import re
 
 def query_package(module, pkgin_path, name):
     """Search for the package by name.
@@ -95,33 +96,46 @@ def query_package(module, pkgin_path, name):
     # rc will not be 0 unless the search was a success
     if rc == 0:
 
-        # Get first line
-        line = out.split('\n')[0]
-
-        # Break up line at spaces.  The first part will be the package with its
-        # version (e.g. 'gcc47-libs-4.7.2nb4'), and the second will be the state
-        # of the package:
-        #     ''  - not installed
-        #     '<' - installed but out of date
-        #     '=' - installed and up to date
-        #     '>' - installed but newer than the repository version
-        pkgname_with_version, raw_state = out.split(splitchar)[0:2]
-
-        # Strip version
-        # (results in sth like 'gcc47-libs')
-        pkgname_without_version = '-'.join(pkgname_with_version.split('-')[:-1])
-
-        if name != pkgname_without_version:
-            return False
-        # no fall-through
-
-        # The package was found; now return its state
-        if raw_state == '<':
-            return 'outdated'
-        elif raw_state == '=' or raw_state == '>':
-            return 'present'
-        else:
-            return False
+        # Search results may contain more than one line (e.g., 'emacs'), so iterate
+        # through each line to see if we have a match.
+        packages = out.split('\n')
+
+        for package in packages:
+
+            # Break up line at spaces.  The first part will be the package with its
+            # version (e.g. 'gcc47-libs-4.7.2nb4'), and the second will be the state
+            # of the package:
+            #     ''  - not installed
+            #     '<' - installed but out of date
+            #     '=' - installed and up to date
+            #     '>' - installed but newer than the repository version
+            pkgname_with_version, raw_state = package.split(splitchar)[0:2]
+
+            # Search for package, stripping version
+            # (results in sth like 'gcc47-libs' or 'emacs24-nox11')
+            pkg_search_obj = re.search(r'^([a-zA-Z]+[0-9]*[\-]*\w*)-[0-9]', pkgname_with_version, re.M)
+
+            # Do not proceed unless we have a match
+            if not pkg_search_obj:
+                continue
+
+            # Grab matched string
+            pkgname_without_version = pkg_search_obj.group(1)
+
+            if name != pkgname_without_version:
+                continue
+
+            # The package was found; now return its state
+            if raw_state == '<':
+                return 'outdated'
+            elif raw_state == '=' or raw_state == '>':
+                return 'present'
+            else:
+                return False
+            # no fall-through
+
+        # No packages were matched, so return False
+        return False
 
 
 def format_action_message(module, action, count):