Plugins/PkgVars: new plugin to set various vars per package

This plugins allows the setting of varius flags per package. It should
be used f.e. to specify pinnings for debian packages or use flags and
keywords for gentoo packages (needs to be implemented by future Portage
plugin).

5 files changed, 95 insertions, 8 deletions

diff --git a/src/lib/Bcfg2/Server/Lint/Validate.py b/src/lib/Bcfg2/Server/Lint/Validate.py
index 3efcc890d..520dac9b7 100644
--- a/src/lib/Bcfg2/Server/Lint/Validate.py
+++ b/src/lib/Bcfg2/Server/Lint/Validate.py
@@ -52,7 +52,8 @@ class Validate(Bcfg2.Server.Lint.ServerlessPlugin):
              "FileProbes/config.xml": "fileprobes.xsd",
              "SSLCA/**/cert.xml": "sslca-cert.xsd",
              "SSLCA/**/key.xml": "sslca-key.xsd",
-             "GroupLogic/groups.xml": "grouplogic.xsd"
+             "GroupLogic/groups.xml": "grouplogic.xsd",
+             "PkgVars/*.xml": "pkgvars.xsd"
              }
 
         self.filelists = {}
diff --git a/src/lib/Bcfg2/Server/Plugins/Packages/Collection.py b/src/lib/Bcfg2/Server/Plugins/Packages/Collection.py
index c884b303e..2496d9aa1 100644
--- a/src/lib/Bcfg2/Server/Plugins/Packages/Collection.py
+++ b/src/lib/Bcfg2/Server/Plugins/Packages/Collection.py
@@ -308,7 +308,7 @@ class Collection(list, Bcfg2.Server.Plugin.Debuggable):
         return any(source.is_virtual_package(self.metadata, package)
                    for source in self)
 
-    def get_deps(self, package, recs=None):
+    def get_deps(self, package, recs=None, pinnings=None):
         """ Get a list of the dependencies of the given package.
 
         The base implementation simply aggregates the results of
@@ -316,16 +316,35 @@ class Collection(list, Bcfg2.Server.Plugin.Debuggable):
 
         :param package: The name of the symbol, but see :ref:`pkg-objects`
         :type package: string
+        :param pinnings: Mapping from package names to source names.
+        :type pinnings: dict
         :returns: list of strings, but see :ref:`pkg-objects`
         """
         recommended = None
         if recs and package in recs:
             recommended = recs[package]
 
+        pin_found = False
+        pin_source = None
+        if pinnings and package in pinnings:
+            pin_source = pinnings[package]
+
         for source in self:
+            if pin_source and pin_source != source.name:
+                continue
+            pin_found = True
+
             if source.is_package(self.metadata, package):
                 return source.get_deps(self.metadata, package, recommended)
 
+        if not pin_found:
+            if pin_source:
+                self.logger.error("Packages: Source '%s' for package '%s' not found" %
+                                  (pin_source, package))
+            else:
+                self.logger.error("Packages: No source found for package '%s'" %
+                                  package);
+
         return []
 
     def get_essential(self):
@@ -505,12 +524,15 @@ class Collection(list, Bcfg2.Server.Plugin.Debuggable):
         return list(complete.difference(initial))
 
     @Bcfg2.Server.Plugin.track_statistics()
-    def complete(self, packagelist, recommended=None):  # pylint: disable=R0912,R0914
+    def complete(self, packagelist, recommended=None,
+                 pinnings=None):  # pylint: disable=R0912,R0914
         """ Build a complete list of all packages and their dependencies.
 
         :param packagelist: Set of initial packages computed from the
                             specification.
         :type packagelist: set of strings, but see :ref:`pkg-objects`
+        :param pinnings: Mapping from package names to source names.
+        :type pinnings: dict
         :returns: tuple of sets - The first element contains a set of
                   strings (but see :ref:`pkg-objects`) describing the
                   complete package list, and the second element is a
@@ -569,7 +591,7 @@ class Collection(list, Bcfg2.Server.Plugin.Debuggable):
                 self.debug_log("Packages: handling package requirement %s" %
                                (current,))
                 packages.add(current)
-                deps = self.get_deps(current, recommended)
+                deps = self.get_deps(current, recommended, pinnings)
                 newdeps = set(deps).difference(examined)
                 if newdeps:
                     self.debug_log("Packages: Package %s added requirements %s"
diff --git a/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py b/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py
index e09b55395..6100813f9 100644
--- a/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py
+++ b/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py
@@ -853,7 +853,7 @@ class YumCollection(Collection):
         return new
 
     @Bcfg2.Server.Plugin.track_statistics()
-    def complete(self, packagelist, recommended=None):
+    def complete(self, packagelist, recommended=None, pinnings=None):
         """ Build a complete list of all packages and their dependencies.
 
         When using the Python yum libraries, this defers to the
@@ -871,7 +871,8 @@ class YumCollection(Collection):
                   resolved.
         """
         if not self.use_yum:
-            return Collection.complete(self, packagelist, recommended)
+            return Collection.complete(self, packagelist, recommended,
+                                       pinnings)
 
         lock = FileLock(os.path.join(self.cachefile, "lock"))
         slept = 0
diff --git a/src/lib/Bcfg2/Server/Plugins/Packages/__init__.py b/src/lib/Bcfg2/Server/Plugins/Packages/__init__.py
index 84ba53840..2a683568d 100644
--- a/src/lib/Bcfg2/Server/Plugins/Packages/__init__.py
+++ b/src/lib/Bcfg2/Server/Plugins/Packages/__init__.py
@@ -398,6 +398,10 @@ class Packages(Bcfg2.Server.Plugin.Plugin,
         groups = []
         recommended = dict()
 
+        pinned_src = dict()
+        if hasattr(metadata, 'PkgVars'):
+            pinned_src = metadata.PkgVars['pin']
+
         for struct in structures:
             for pkg in struct.xpath('//Package | //BoundPackage'):
                 if pkg.get("name"):
@@ -438,10 +442,10 @@ class Packages(Bcfg2.Server.Plugin.Plugin,
         base.update(collection.get_essential())
 
         # check for this set of packages in the package cache
-        pkey = hash((tuple(base), tuple(recommended)))
+        pkey = hash((tuple(base), tuple(recommended), tuple(pinned_src)))
         if pkey not in self.pkgcache[collection.cachekey]:
             self.pkgcache[collection.cachekey][pkey] = \
-                collection.complete(base, recommended)
+                collection.complete(base, recommended, pinned_src)
         packages, unknown = self.pkgcache[collection.cachekey][pkey]
 
         if unknown:
diff --git a/src/lib/Bcfg2/Server/Plugins/PkgVars.py b/src/lib/Bcfg2/Server/Plugins/PkgVars.py
new file mode 100644
index 000000000..2bf1b158a
--- /dev/null
+++ b/src/lib/Bcfg2/Server/Plugins/PkgVars.py
@@ -0,0 +1,59 @@
+import os
+import re
+import sys
+import copy
+import logging
+import lxml.etree
+import Bcfg2.Server.Plugin
+
+logger = logging.getLogger('Bcfg2.Plugins.PkgVars')
+vars = ['pin', 'use', 'keywords']
+
+class PkgVarsFile(Bcfg2.Server.Plugin.StructFile):
+    def get_additional_data(self, meta):
+        data = self.Match(meta)
+        results = {}
+        for d in data:
+            name = d.get('name', '')
+
+            for v in vars:
+                value = d.get(v, None)
+                if value:
+                    results[v][name] = value
+
+        return results
+
+class PkgVarsDirectoryBacked(Bcfg2.Server.Plugin.DirectoryBacked):
+    __child__ = PkgVarsFile
+    patterns = re.compile(r'.*\.xml$')
+
+    def get_additional_data(self, meta):
+        results = {}
+        for v in vars:
+            results[v] = {}
+
+        for files in self.entries:
+            new = self.entries[files].get_additional_data(meta)
+            for x in vars:
+                results[x].update(new[x])
+
+        return results
+
+class PkgVars(Bcfg2.Server.Plugin.Plugin,
+              Bcfg2.Server.Plugin.Connector):
+    name = 'PkgVars'
+    version = '$Revision$'
+
+    def __init__(self, core, datastore):
+        Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
+        Bcfg2.Server.Plugin.Connector.__init__(self)
+        try:
+            self.store = PkgVarsDirectoryBacked(self.data, core.fam)
+        except OSError:
+            e = sys.exc_info()[1]
+            self.logger.error("Error while creating PkgVars store: %s %s" %
+                              (e.strerror, e.filename))
+            raise Bcfg2.Server.Plugin.PluginInitError
+
+    def get_additional_data(self, meta):
+        return self.store.get_additional_data(meta)