From 0c0e773334404a9406bfb413e7ef7e89d5ac4a86 Mon Sep 17 00:00:00 2001
From: "Chris St. Pierre" <chris.a.st.pierre@gmail.com>
Date: Tue, 4 Jun 2013 13:31:55 -0400
Subject: bcfg2-yum-helper: use null RPM db

---
 src/lib/Bcfg2/Server/Plugins/Packages/Yum.py | 10 ++++++++--
 src/sbin/bcfg2-yum-helper                    | 21 +++++++++++++++++++--
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py b/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py
index 20b2c9500..29b403291 100644
--- a/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py
+++ b/src/lib/Bcfg2/Server/Plugins/Packages/Yum.py
@@ -877,10 +877,16 @@ class YumCollection(Collection):
         :returns: Varies depending on the return value of the
                   ``bcfg2-yum-helper`` command.
         """
-        cmd = [self.helper, "-c", self.cfgfile]
+        cmd = [self.helper, "-c", self.cfgfile, "-t", self.cachefile]
         verbose = self.debug_flag or self.setup['verbose']
-        if verbose:
+        if self.setup['verbose']:
             cmd.append("-v")
+        if self.debug_flag:
+            cmd.append("-v")
+            if not self.setup['verbose']:
+                # ensure that the helper is always run with -vv in
+                # debug mode, even if verbose is disabled
+                cmd.append("-v")
         cmd.append(command)
         self.debug_log("Packages: running %s" % " ".join(cmd), flag=verbose)
         try:
diff --git a/src/sbin/bcfg2-yum-helper b/src/sbin/bcfg2-yum-helper
index 7dbdad16b..9e2a1b410 100755
--- a/src/sbin/bcfg2-yum-helper
+++ b/src/sbin/bcfg2-yum-helper
@@ -8,7 +8,10 @@ code.  It's pure madness. """
 import os
 import sys
 import yum
+import atexit
+import shutil
 import logging
+import tempfile
 import Bcfg2.Logger
 from optparse import OptionParser
 try:
@@ -45,9 +48,15 @@ def pkgtup_to_string(package):
 class DepSolver(object):
     """ Yum dependency solver """
 
-    def __init__(self, cfgfile, verbose=1):
+    def __init__(self, cfgfile, tempdir=None, verbose=1):
         self.cfgfile = cfgfile
         self.yumbase = yum.YumBase()
+        self.tmpdir = tempdir
+        # do not use the local rpmdb; instead, use a bogus RPM db
+        # (with no packages in it) as the rpmdb.
+        self.yumbase.rpmdb = \
+            yum.rpmsack.RPMDBPackageSack(root=self.tmpdir,
+                                         persistdir=self.tmpdir)
         # pylint: disable=E1121,W0212
         try:
             self.yumbase.preconf.debuglevel = verbose
@@ -197,6 +206,7 @@ class DepSolver(object):
 def main():
     parser = OptionParser()
     parser.add_option("-c", "--config", help="Config file")
+    parser.add_option("-t", "--tmpdir", help="Temporary directory to use")
     parser.add_option("-v", "--verbose", help="Verbosity level",
                       action="count")
     (options, args) = parser.parse_args()
@@ -221,7 +231,14 @@ def main():
         logger.error("Config file %s not found" % options.config)
         return 1
 
-    depsolver = DepSolver(options.config, options.verbose)
+    if options.tmpdir:
+        tmpdir = options.tmpdir
+    else:
+        tmpdir = tempfile.mkdtemp()
+        logger.debug("Using %s as temp dir" % tmpdir)
+        atexit.register(lambda: shutil.rmtree(tmpdir))
+
+    depsolver = DepSolver(options.config, tmpdir, options.verbose)
     if cmd == "clean":
         depsolver.clean_cache()
         print(json.dumps(True))
-- 
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