bitbake/fetch2/git: Fix a bug where AUTOREV and the git fetcher interact badly

Fix a bug where ud.branches were being referenced before it was set by
the git fetcher when using AUTOREV. To do this some ordering needed
to be changed. This fixes errors like:

ERROR: Error parsing /recipes-kernel/linux/rt-tests_git.bb: Failure expanding variable
SRCPV, expression was ${@bb.fetch2.get_srcrev(d)} which triggered exception
AttributeError: 'FetchData' object has no attribute 'branches'

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

bitbake/lib/bb/fetch2/__init__.py

@@ -555,6 +555,9 @@ class FetchData(object):
         if not self.method:
             raise NoMethodError(url)
 
+        if hasattr(self.method, "urldata_init"):
+            self.method.urldata_init(self, d)
+
         if self.method.supports_srcrev():
             self.revisions = {}
             for name in self.names:
@@ -564,8 +567,8 @@ class FetchData(object):
             if len(self.names) == 1:
                 self.revision = self.revisions[self.names[0]]
 
-        if hasattr(self.method, "urldata_init"):
-            self.method.urldata_init(self, d)
+        if hasattr(self.method, "fixuprevisions"):
+            self.method.fixuprevisions(self, d)
 
         if "localpath" in self.parm:
             # if user sets localpath for file, use it instead.

bitbake/lib/bb/fetch2/git.py

@@ -72,15 +72,16 @@ class Git(FetchMethod):
 
         ud.basecmd = data.getVar("FETCHCMD_git", d, True) or "git"
 
+        ud.write_tarballs = (data.getVar("BB_GENERATE_MIRROR_TARBALLS", d, True) or "0") != "0"
+
+        ud.localfile = ud.clonedir
+
+    def fixuprevisions(self, ud, d):
         for name in ud.names:
             # Ensure anything that doesn't look like a sha256 checksum/revision is translated into one
             if not ud.revisions[name] or len(ud.revisions[name]) != 40  or (False in [c in "abcdef0123456789" for c in ud.revisions[name]]):
                 ud.revisions[name] = self.latest_revision(ud.url, ud, d, name)
 
-        ud.write_tarballs = (data.getVar("BB_GENERATE_MIRROR_TARBALLS", d, True) or "0") != "0"
-
-        ud.localfile = ud.clonedir
-
     def localpath(self, url, ud, d):
         return ud.clonedir