diff --git a/poky/bitbake/lib/bb/fetch2/git.py b/poky/bitbake/lib/bb/fetch2/git.py
index 2d1d2ca..fa41b07 100644
--- a/poky/bitbake/lib/bb/fetch2/git.py
+++ b/poky/bitbake/lib/bb/fetch2/git.py
@@ -292,11 +292,21 @@
     def clonedir_need_update(self, ud, d):
         if not os.path.exists(ud.clonedir):
             return True
+        if ud.shallow and ud.write_shallow_tarballs and self.clonedir_need_shallow_revs(ud, d):
+            return True
         for name in ud.names:
             if not self._contains_ref(ud, d, name, ud.clonedir):
                 return True
         return False
 
+    def clonedir_need_shallow_revs(self, ud, d):
+        for rev in ud.shallow_revs:
+            try:
+                runfetchcmd('%s rev-parse -q --verify %s' % (ud.basecmd, rev), d, quiet=True, workdir=ud.clonedir)
+            except bb.fetch2.FetchError:
+                return rev
+        return None
+
     def shallow_tarball_need_update(self, ud):
         return ud.shallow and ud.write_shallow_tarballs and not os.path.exists(ud.fullshallow)
 
@@ -339,13 +349,7 @@
             runfetchcmd(clone_cmd, d, log=progresshandler)
 
         # Update the checkout if needed
-        needupdate = False
-        for name in ud.names:
-            if not self._contains_ref(ud, d, name, ud.clonedir):
-                needupdate = True
-                break
-
-        if needupdate:
+        if self.clonedir_need_update(ud, d):
             output = runfetchcmd("%s remote" % ud.basecmd, d, quiet=True, workdir=ud.clonedir)
             if "origin" in output:
               runfetchcmd("%s remote rm origin" % ud.basecmd, d, workdir=ud.clonedir)
@@ -369,6 +373,11 @@
             if not self._contains_ref(ud, d, name, ud.clonedir):
                 raise bb.fetch2.FetchError("Unable to find revision %s in branch %s even from upstream" % (ud.revisions[name], ud.branches[name]))
 
+        if ud.shallow and ud.write_shallow_tarballs:
+            missing_rev = self.clonedir_need_shallow_revs(ud, d)
+            if missing_rev:
+                raise bb.fetch2.FetchError("Unable to find revision %s even from upstream" % missing_rev)
+
     def build_mirror_data(self, ud, d):
         if ud.shallow and ud.write_shallow_tarballs:
             if not os.path.exists(ud.fullshallow):
diff --git a/poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py b/poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py
index 2e84b91..af64d34 100644
--- a/poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py
+++ b/poky/bitbake/lib/bb/parse/parse_py/ConfHandler.py
@@ -119,30 +119,30 @@
         oldfile = data.getVar('FILE', False)
 
     abs_fn = resolve_file(fn, data)
-    f = open(abs_fn, 'r')
+    with open(abs_fn, 'r') as f:
 
-    statements = ast.StatementGroup()
-    lineno = 0
-    while True:
-        lineno = lineno + 1
-        s = f.readline()
-        if not s:
-            break
-        w = s.strip()
-        # skip empty lines
-        if not w:
-            continue
-        s = s.rstrip()
-        while s[-1] == '\\':
-            s2 = f.readline().rstrip()
+        statements = ast.StatementGroup()
+        lineno = 0
+        while True:
             lineno = lineno + 1
-            if (not s2 or s2 and s2[0] != "#") and s[0] == "#" :
-                bb.fatal("There is a confusing multiline, partially commented expression on line %s of file %s (%s).\nPlease clarify whether this is all a comment or should be parsed." % (lineno, fn, s))
-            s = s[:-1] + s2
-        # skip comments
-        if s[0] == '#':
-            continue
-        feeder(lineno, s, abs_fn, statements)
+            s = f.readline()
+            if not s:
+                break
+            w = s.strip()
+            # skip empty lines
+            if not w:
+                continue
+            s = s.rstrip()
+            while s[-1] == '\\':
+                s2 = f.readline().rstrip()
+                lineno = lineno + 1
+                if (not s2 or s2 and s2[0] != "#") and s[0] == "#" :
+                    bb.fatal("There is a confusing multiline, partially commented expression on line %s of file %s (%s).\nPlease clarify whether this is all a comment or should be parsed." % (lineno, fn, s))
+                s = s[:-1] + s2
+            # skip comments
+            if s[0] == '#':
+                continue
+            feeder(lineno, s, abs_fn, statements)
 
     # DONE WITH PARSING... time to evaluate
     data.setVar('FILE', abs_fn)
diff --git a/poky/bitbake/lib/bb/tests/fetch.py b/poky/bitbake/lib/bb/tests/fetch.py
index a0b656b..83fad3f 100644
--- a/poky/bitbake/lib/bb/tests/fetch.py
+++ b/poky/bitbake/lib/bb/tests/fetch.py
@@ -1863,6 +1863,26 @@
         with self.assertRaises(bb.fetch2.FetchError):
             self.fetch()
 
+    def test_shallow_fetch_missing_revs(self):
+        self.add_empty_file('a')
+        self.add_empty_file('b')
+        fetcher, ud = self.fetch(self.d.getVar('SRC_URI'))
+        self.git('tag v0.0 master', cwd=self.srcdir)
+        self.d.setVar('BB_GIT_SHALLOW_DEPTH', '0')
+        self.d.setVar('BB_GIT_SHALLOW_REVS', 'v0.0')
+        self.fetch_shallow()
+
+    def test_shallow_fetch_missing_revs_fails(self):
+        self.add_empty_file('a')
+        self.add_empty_file('b')
+        fetcher, ud = self.fetch(self.d.getVar('SRC_URI'))
+        self.d.setVar('BB_GIT_SHALLOW_DEPTH', '0')
+        self.d.setVar('BB_GIT_SHALLOW_REVS', 'v0.0')
+
+        with self.assertRaises(bb.fetch2.FetchError), self.assertLogs("BitBake.Fetcher", level="ERROR") as cm:
+            self.fetch_shallow()
+        self.assertIn("Unable to find revision v0.0 even from upstream", cm.output[0])
+
     @skipIfNoNetwork()
     def test_bitbake(self):
         self.git('remote add --mirror=fetch origin git://github.com/openembedded/bitbake', cwd=self.srcdir)
diff --git a/poky/bitbake/lib/prserv/serv.py b/poky/bitbake/lib/prserv/serv.py
index be3acec..2bc6890 100644
--- a/poky/bitbake/lib/prserv/serv.py
+++ b/poky/bitbake/lib/prserv/serv.py
@@ -379,9 +379,8 @@
     ip = socket.gethostbyname(host)
     pidfile = PIDPREFIX % (ip, port)
     try:
-        pf = open(pidfile,'r')
-        pid = int(pf.readline().strip())
-        pf.close()
+        with open(pidfile) as pf:
+            pid = int(pf.readline().strip())
     except IOError:
         pid = None