src/zc/buildout: Add cond if slapos picked versions

src/zc/buildout/easy_install.py

@@ -564,7 +564,7 @@ class Installer:
         wheel = getattr(requirement, 'wheel', False)
         dists = [dist for dist in index[requirement.project_name]
                  if ((dist in requirement)
-                     and (dist.precedence == WHL_DIST) == wheel and
+                     and ((dist.precedence == WHL_DIST) == wheel or self._is_dist_picked(dist, requirement)) and
                      ((not source) or
                       (dist.precedence == pkg_resources.SOURCE_DIST)
                       )
@@ -581,6 +581,9 @@ class Installer:
                 # There are final dists, so only use those
                 dists = fdists
 
+        # Filter out wheels if possible
+        dists = [d for d in dists if d.precedence != WHL_DIST] or dists
+
         # Now find the best one:
         best = []
         bestv = None
@@ -742,13 +745,7 @@ class Installer:
         if self._check_picked:
             # Check whether we picked a version and, if we did, report it:
             for dist in dists:
-                if not (
-                    dist.precedence == pkg_resources.DEVELOP_DIST
-                    or
-                    (len(requirement.specs) == 1
-                     and
-                     requirement.specs[0][0] == '==')
-                    ):
+                if self._is_dist_picked(dist, requirement):
                     logger.debug('Picked: %s = %s',
                                  dist.project_name, dist.version)
                     self._picked_versions[dist.project_name] = dist.version
@@ -761,6 +758,16 @@ class Installer:
 
         return dists
 
+    def _is_dist_picked(self, dist, requirement):
+      return not (
+        dist.precedence == pkg_resources.DEVELOP_DIST
+        or
+        (len(requirement.specs) == 1
+          and
+          requirement.specs[0][0] == '=='
+        )
+      )
+
     def _maybe_add_setuptools(self, ws, dist):
         if dist.has_metadata('namespace_packages.txt'):
             for r in dist.requires():