Merging the code over from the oscar branch. I will now be doing all development in the trunk again, except for larger changes, which will still get their own branch. This is a merge of the changes from revision 1826 to revision 1834.

git-svn-id: https://reductivelabs.com/svn/puppet/trunk@1835 980ebf18-57e1-0310-9a29-db15c13687c0

1 files changed, 78 insertions, 0 deletions

diff --git a/lib/puppet/util/posix.rb b/lib/puppet/util/posix.rb
new file mode 100755
index 000000000..75726b3da
--- /dev/null
+++ b/lib/puppet/util/posix.rb
@@ -0,0 +1,78 @@
+# Utility methods for interacting with POSIX objects; mostly user and group
+module Puppet::Util::POSIX
+    # Retrieve a field from a POSIX Etc object.  The id can be either an integer
+    # or a name.  This only works for users and groups.
+    def get_posix_field(space, field, id)
+        if id =~ /^\d+$/
+            id = Integer(id)
+        end
+        prefix = "get" + space.to_s
+        if id.is_a?(Integer)
+            method = (prefix + idfield(space).to_s).intern
+        else
+            method = (prefix + "nam").intern
+        end
+        
+        begin
+            return Etc.send(method, id).send(field)
+        rescue ArgumentError => detail
+            # ignore it; we couldn't find the object
+            return nil
+        end
+    end
+    
+    # Look in memory for an already-managed type and use its info if available.
+    def get_provider_value(type, field, id)
+        unless typeklass = Puppet::Type.type(type)
+            raise ArgumentError, "Invalid type %s" % type
+        end
+        
+        id = id.to_s
+        
+        chkfield = idfield(type)
+        obj = typeklass.find { |obj|
+            if id =~ /^\d+$/
+                obj.should(chkfield).to_s == id ||
+                    obj.is(chkfield).to_s == id
+            else 
+                obj[:name] == id
+            end                    
+        }
+        
+        return nil unless obj
+        
+        if obj.provider
+            begin
+                return obj.provider.send(field)
+            rescue => detail
+                if Puppet[:trace]
+                    puts detail.backtrace
+                    Puppet.err detail
+                    return nil
+                end
+            end
+        end
+    end
+    
+    # Determine what the field name is for users and groups.
+    def idfield(space)
+        case Puppet::Util.symbolize(space)
+        when :gr, :group: return :gid
+        when :pw, :user: return :uid
+        else
+            raise ArgumentError.new("Can only handle users and groups")
+        end
+    end
+    
+    # Get the GID of a given group, provided either a GID or a name
+    def gid(group)
+        get_provider_value(:group, :gid, group) or get_posix_field(:gr, :gid, group)
+    end
+
+    # Get the UID of a given user, whether a UID or name is provided
+    def uid(user)
+        get_provider_value(:user, :uid, user) or get_posix_field(:pw, :uid, user)
+    end
+end
+
+# $Id$
\ No newline at end of file