[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7421/8267] wic: reimplement getting paths of used tools

[Emmanuele Bassi <ebassi src gnome org>]

commit ff0bbdafa466aa006dc91a32814ecbe7ae093724
Author: Ed Bartosh <ed bartosh linux intel com>
Date:   Fri Aug 25 23:12:22 2017 +0300

    wic: reimplement getting paths of used tools
    
    So far every used tool have to have separate property and
    private attribute in the Disk class. This is too verbose,
    considering that there will be much more tools used.
    
    Reimplemented getting tools paths using custom __getattr__
    method. This is much more compact and readable.
    
    (From OE-Core rev: d1a831a9870bc31e936eb480485b28f1ffc13080)
    
    Signed-off-by: Ed Bartosh <ed bartosh linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 scripts/lib/wic/engine.py |   36 +++++++++---------------------------
 1 files changed, 9 insertions(+), 27 deletions(-)
---
diff --git a/scripts/lib/wic/engine.py b/scripts/lib/wic/engine.py
index 2dc2fd5..b23dd65 100644
--- a/scripts/lib/wic/engine.py
+++ b/scripts/lib/wic/engine.py
@@ -236,10 +236,6 @@ class Disk:
         self.imagepath = imagepath
         self.native_sysroot = native_sysroot
         self._partitions = None
-        self._mdir = None
-        self._mcopy = None
-        self._mdel = None
-        self._mdeltree = None
         self._partimages = {}
 
         # find parted
@@ -270,30 +266,16 @@ class Disk:
 
         return self._partitions
 
-    def _prop(self, name):
+    def __getattr__(self, name):
         """Get path to the executable in a lazy way."""
-        aname = "_%s" % name
-        if getattr(self, aname) is None:
-            setattr(self, aname, find_executable(name, self.paths))
-            if not getattr(self, aname):
-                raise WicError("Can't find executable {}".format(name))
-        return getattr(self, aname)
-
-    @property
-    def mdir(self):
-        return self._prop('mdir')
-
-    @property
-    def mcopy(self):
-        return self._prop("mcopy")
-
-    @property
-    def mdel(self):
-        return self._prop("mdel")
-
-    @property
-    def mdeltree(self):
-        return self._prop("mdeltree")
+        if name in ("mdir", "mcopy", "mdel", "mdeltree"):
+            aname = "_%s" % name
+            if aname not in self.__dict__:
+                setattr(self, aname, find_executable(name, self.paths))
+                if aname not in self.__dict__:
+                    raise WicError("Can't find executable {}".format(name))
+            return self.__dict__[aname]
+        return self.__dict__[name]
 
     def _get_part_image(self, pnum):
         if pnum not in self.partitions: