Removed untested broken code with an optimization to avoid checking

for versions if the given requirement had an upper limit and we
already had the distribution whos version was the upper limit.

Added simpler tested code that checks for the simpler case that teh
requirement is for a specific version and we already have that
version.  In general, specifying upper limits other than a single
version is kind of dumb, so it's not worth optimizing for that case.

CHANGES.txt

@@ -16,6 +16,15 @@ final soon.)
 Change History
 **************
 
+1.0.0b28 (2007-07-05)
+=====================
+
+Bugs Fixed
+----------
+
+- When requiring a specific version, buildout looked for new versions
+  even if that single version was already installed.
+
 1.0.0b27 (2007-06-20)
 =====================
 

setup.py

@@ -35,7 +35,7 @@ open('doc.txt', 'w').write(long_description)
 name = "zc.buildout"
 setup(
     name = name,
-    version = "1.0.0b27",
+    version = "1.0.0b28",
     author = "Jim Fulton",
     author_email = "jim@zope.com",
     description = "System for managing development buildouts",

src/zc/buildout/easy_install.py

@@ -180,47 +180,20 @@ class Installer:
             # Environment.__getitem__.
             return dists[0], None
 
-        # Find an upper limit in the specs, if there is one:
-        specs = [(pkg_resources.parse_version(v), op) for (op, v) in req.specs]
-        specs.sort()
-        maxv = None
-        greater = False
-        lastv = None
-        for v, op in specs:
-            if op == '==' and not greater:
-                maxv = v
-            elif op in ('>', '>=', '!='):
-                maxv = None
-                greater == True
-            elif op == '<':
-                maxv = None
-                greater == False
-            elif op == '<=':
-                maxv = v
-                greater == False
-
-            if v == lastv:
-                # Repeated versions values are undefined, so
-                # all bets are off
-                maxv = None
-                greater = True
-            else:
-                lastv = v
+        # Special common case, we have a specification for a single version:
+        specs = req.specs
+        if len(specs) == 1 and specs[0][0] == '==':
+            logger.debug('We have the distribution that satisfies %r.',
+                         str(req))
+            return dists[0], None
 
         best_we_have = dists[0] # Because dists are sorted from best to worst
 
-        # Check if we have the upper limit
-        if maxv is not None and best_we_have.version == maxv:
-            logger.debug('We have the best distribution that satisfies %r.',
-                         str(req))
-            return best_we_have, None
-
         # We have some installed distros.  There might, theoretically, be
         # newer ones.  Let's find out which ones are available and see if
         # any are newer.  We only do this if we're willing to install
         # something, which is only true if dest is not None:
         
-        
         if self._dest is not None:
             best_available = self._obtain(req, source)
         else:

src/zc/buildout/repeatable.txt

@@ -151,7 +151,7 @@ If we run the buildout with the versions section:
     We have the best distribution that satisfies 'setuptools'.
     Picked: setuptools = 0.6
     Installing 'spam'.
-    We have the best distribution that satisfies 'spam==1'.
+    We have the distribution that satisfies 'spam==1'.
     Uninstalling foo.
     Installing foo.
     recipe v1

src/zc/buildout/tests.py

@@ -325,7 +325,7 @@ If we use the verbose switch, we can see where requirements are comning from:
     We have a develop egg: samplez 1
     Getting required 'demoneeded==1.1'
       required by samplez 1.
-    We have the best distribution that satisfies 'demoneeded==1.1'.
+    We have the distribution that satisfies 'demoneeded==1.1'.
     Getting required 'sampleb'
       required by samplea 1.
     We have a develop egg: sampleb 1