bitbake/fetch2: Allow local file:// urls to be found on mirrors

With the current implementation, file:// urls as used by sstate don't access the
mirror code, breaking sstate mirror support. This change enables the usual
mirror handling. To do this, we remove the localfile special case, using the basename
paramemter instead. We also ensure the downloads directory is checked for files.

The drawback of this change is that file urls containing "*" globing require special
casing in the core.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/__init__.py

@@ -525,6 +525,7 @@ class FetchData(object):
         self.localpath = None
         self.lockfile = None
         self.mirrortarball = None
+        self.basename = None
         (self.type, self.host, self.path, self.user, self.pswd, self.parm) = decodeurl(data.expand(url, d))
         self.date = self.getSRCDate(d)
         self.url = url
@@ -573,11 +574,10 @@ class FetchData(object):
         elif self.localfile:
             self.localpath = self.method.localpath(self.url, self, d)
 
-        if self.localfile and self.localpath:
-            # Note: These files should always be in DL_DIR whereas localpath may not be.
-            basepath = bb.data.expand("${DL_DIR}/%s" % os.path.basename(self.localpath), d)
-            self.donestamp = basepath + '.done'
-            self.lockfile = basepath + '.lock'
+        # Note: These files should always be in DL_DIR whereas localpath may not be.
+        basepath = bb.data.expand("${DL_DIR}/%s" % os.path.basename(self.localpath or self.basename), d)
+        self.donestamp = basepath + '.done'
+        self.lockfile = basepath + '.lock'
 
     def setup_localpath(self, d):
         if not self.localpath:
@@ -913,9 +913,6 @@ class Fetch(object):
             m = ud.method
             localpath = ""
 
-            if not ud.localfile:
-                continue
-
             lf = bb.utils.lockfile(ud.lockfile)
 
             try:
@@ -951,7 +948,7 @@ class Fetch(object):
                         mirrors = mirror_from_string(bb.data.getVar('MIRRORS', self.d, True))
                         localpath = try_mirrors (self.d, ud, mirrors)
 
-                if not localpath or not os.path.exists(localpath):
+                if not localpath or ((not os.path.exists(localpath)) and localpath.find("*") == -1):
                     raise FetchError("Unable to fetch URL %s from any source." % u, u)
 
                 if os.path.exists(ud.donestamp):