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wic: add Disk._prop helper

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Added generic helper to use in property methods to
access commands in a lazy manner.

(From OE-Core rev: 4c1ded3ddbd04ad1640620ec1348831692a93dbe)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Ed Bartosh
2017-06-13 14:22:01 +03:00
committed by Richard Purdie
parent ecefd3c55b
commit 0165f40cbb
1 changed files with 10 additions and 5 deletions
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15
scripts/lib/wic/engine.py
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@@ -267,13 +267,18 @@ class Disk:
return self._partitions
def _prop(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):
if self._mdir is None:
self._mdir = find_executable("mdir", self.paths)
if not self._mdir:
raise WicError("Can't find executable mdir")
return self._mdir
return self._prop('mdir')
def _get_part_image(self, pnum):
if pnum not in self.partitions: