Fix rpm package equality issue

If package depends on exact equality of =name+version
we also need to search candidates in release section:
   =name+version+(>=release)

eg:
  name: foo-1.1-3
  Requires: bar == 5.5

  then the below package must meet the requiremets:
  name: bar-5.5-56.el7

To make this true we need:
* always search for candidates in package.name and package.provides,
  package.obsoletes, [check PackagesTree.find_all()]
* make an assumption that foo-1.1 and foo-1.1-33 has intersection,
  [check RpmPackageVersion.cmp()]

Tests:
======
gen_package() in stubs.generator must always generate Provides
section, which is always: name=version, eg:
1)   Name: my-python-requests
     Version: 2.10.0
     Release: 1.el7~mos1

   will result PROVIDES:
     my-python-requests = 2.10.0-1.el7~mos1

2)   Name: my-python-urllib3
     Version: 1.15.1
     Release: 7777
     Provides: test

   will result PROVIDES:
     test
     my-python-urllib3 = 1.15.1-7777

Change-Id: Ib26918b2e1d98733fbd49f1fc05403ca5665e3fe
Closes-Bug: #1588399

packetary/drivers/rpm_driver.py

@@ -109,7 +109,15 @@ class RpmPackageVersion(ComparableObject):
     def cmp(self, other):
         if not isinstance(other, RpmPackageVersion):
             other = RpmPackageVersion.from_string(str(other))
-
+        # if some package doesn't have release then we are processing
+        # some Require section, so let's assume foo-1.2 == foo-1.2-45
+        # in order to build correct list of providers
+        if self.release == '' or other.release == '':
+            return rpmUtils.miscutils.compareEVR(
+                (self.epoch, self.version, ''),
+                (other.epoch, other.version, '')
+            )
+        # we have full evr, so let's compare them all
         return rpmUtils.miscutils.compareEVR(
             (self.epoch, self.version, self.release),
             (other.epoch, other.version, other.release)

packetary/objects/packages_tree.py

@@ -57,6 +57,7 @@ class PackagesTree(object):
         """
         candidates = self.find_all(name, version_range)
         if len(candidates) > 0:
+            # we return candidates in sorted order, so let's take the highest
             return candidates[-1]
         return None
 
@@ -67,19 +68,25 @@ class PackagesTree(object):
         :param version_range: the range of versions.
         :return: the list of suitable packages
         """
+        candidates = set()
+        # find package by name
         if name in self.packages:
-            candidates = self.packages.find_all(name, version_range)
-            if len(candidates) > 0:
-                return candidates
+            candidates.update(self.packages.find_all(name, version_range))
 
+        # find package by provides
+        # in case of rpm:
+        #    set(candidates) >= set(provides)
         if name in self.provides:
-            result = self._resolve_relation(self.provides[name], version_range)
-            if result:
-                return result
+            candidates.update(self._resolve_relation(
+                self.provides[name], version_range)
+            )
 
         if name in self.obsoletes:
-            return self._resolve_relation(self.obsoletes[name], version_range)
-        return []
+            candidates.update(self._resolve_relation(
+                self.obsoletes[name], version_range)
+            )
+
+        return sorted(candidates, key=lambda x: x.version)
 
     def get_unresolved_dependencies(self):
         """Gets the set of unresolved dependencies.
@@ -111,5 +118,6 @@ class PackagesTree(object):
                 result.extend(
                     self.packages.find_all(key[0], VersionRange('=', key[1]))
                 )
+        # sort related packages ASC
         result.sort(key=lambda x: x.version)
         return result

packetary/tests/stubs/generator.py

@@ -40,14 +40,15 @@ def gen_package(idx=1, **kwargs):
     repository = gen_repository()
     name = kwargs.setdefault("name", "package{0}".format(idx))
     kwargs.setdefault("repository", repository)
-    kwargs.setdefault("version", 1)
+    version = kwargs.setdefault("version", 1)
     kwargs.setdefault("checksum", objects.FileChecksum("1", "2", "3"))
     kwargs.setdefault("filename", "{0}.pkg".format(name))
     kwargs.setdefault("filesize", 1)
-    for relation in ("requires", "provides", "obsoletes"):
+    kwargs["provides"] = [gen_relation(name, ["=", version])]
+    for relation in ("requires", "obsoletes"):
         if relation not in kwargs:
             kwargs[relation] = [gen_relation(
-                "{0}{1}".format(relation, idx), ["<=", idx + 1]
+                "{0}{1}".format(relation, idx), ["<", idx + 1]
             )]
 
     return objects.Package(**kwargs)