fetch2: Correct the clean() mechanism for the fetcher2 code

This create a clean() method in each of the fetcher modules
and correctly cleans the .done stamp file and lock files

Signed-off-by: Saul Wold <sgw@linux.intel.com>

bitbake/lib/bb/fetch2/__init__.py

@@ -491,6 +491,7 @@ class FetchData(object):
     """
     def __init__(self, url, d):
         # localpath is the location of a downloaded result. If not set, the file is local.
+        self.donestamp = None
         self.localfile = ""
         self.localpath = None
         self.lockfile = None
@@ -717,6 +718,12 @@ class FetchMethod(object):
 
         return
 
+    def clean(self, urldata, d):
+       """
+       Clean any existing full or partial download
+       """
+       bb.utils.remove(urldata.localpath)
+
     def try_premirror(self, url, urldata, d):
         """
         Should premirrors be used?
@@ -958,6 +965,33 @@ class Fetch(object):
             if ud.lockfile:
                 bb.utils.unlockfile(lf)
 
+    def clean(self, urls = []):
+        """
+        Clean files that the fetcher gets or places
+        """
+
+        if len(urls) == 0:
+            urls = self.urls
+
+        for url in urls:
+            if url not in self.ud:
+                self.ud[url] = FetchData(url, d)
+            ud = self.ud[url]
+            ud.setup_localpath(self.d)
+
+            if not ud.localfile or self.localpath is None:
+                continue
+
+            if ud.lockfile:
+                lf = bb.utils.lockfile(ud.lockfile)
+
+            ud.method.clean(ud, self.d)
+            if ud.donestamp:
+                bb.utils.remove(ud.donestamp)
+
+            if ud.lockfile:
+                bb.utils.unlockfile(lf)
+
 from . import cvs
 from . import git
 from . import local