selftest/fetch: Avoid occasional selftest failure from poor temp file name choice

The temp file name may contain "_" characters. Switch to a temporary directory
and a fixed filename to avoid this to avoid errors like:

bb.data_smart.ExpansionError: Failure expanding variable PN, expression was
${@bb.parse.vars_from_file(d.getVar('FILE', False),d)[0] or 'defaultpkgname'}
which triggered exception ParseError:
ParseError in /tmp/tmpd_f2__to.bb: Unable to generate default variables from
filename (too many underscores)

(From OE-Core rev: 8c2d92f855fe0d692228f7ebf7e7b116195ccf0c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 086e2ae7b2b7496b4f3ae01436b4049d7f2ff8c4)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/fetch.py

@@ -55,25 +55,26 @@ MIRRORS_forcevariable = "git://.*/.* http://downloads.yoctoproject.org/mirror/so
 
 
 class Dependencies(OESelftestTestCase):
-    def write_recipe(self, content):
+    def write_recipe(self, content, tempdir):
-        f = tempfile.NamedTemporaryFile(mode="wt", suffix=".bb")
+        f = os.path.join(tempdir, "test.bb")
-        f.write(content)
+        with open(f, "w") as fd:
-        f.flush()
+            fd.write(content)
         return f
 
     def test_dependencies(self):
         """
         Verify that the correct dependencies are generated for specific SRC_URI entries.
         """
-        with bb.tinfoil.Tinfoil() as tinfoil:
+
+        with bb.tinfoil.Tinfoil() as tinfoil, tempfile.TemporaryDirectory(prefix="selftest-fetch") as tempdir:
             tinfoil.prepare(config_only=False, quiet=2)
 
             r = """
             LICENSE="CLOSED"
             SRC_URI="http://example.com/tarball.zip"
             """
-            f = self.write_recipe(textwrap.dedent(r))
+            f = self.write_recipe(textwrap.dedent(r), tempdir)
-            d = tinfoil.parse_recipe_file(f.name)
+            d = tinfoil.parse_recipe_file(f)
             self.assertIn("wget-native", d.getVarFlag("do_fetch", "depends"))
             self.assertIn("unzip-native", d.getVarFlag("do_unpack", "depends"))
 
@@ -82,8 +83,8 @@ class Dependencies(OESelftestTestCase):
             LICENSE="CLOSED"
             SRC_URI="https://example.com/tarball;downloadfilename=something.zip"
             """
-            f = self.write_recipe(textwrap.dedent(r))
+            f = self.write_recipe(textwrap.dedent(r), tempdir)
-            d = tinfoil.parse_recipe_file(f.name)
+            d = tinfoil.parse_recipe_file(f)
             self.assertIn("wget-native", d.getVarFlag("do_fetch", "depends"))
             self.assertIn("unzip-native", d.getVarFlag("do_unpack", "depends") or "")
 
@@ -91,8 +92,8 @@ class Dependencies(OESelftestTestCase):
             LICENSE="CLOSED"
             SRC_URI="ftp://example.com/tarball.lz"
             """
-            f = self.write_recipe(textwrap.dedent(r))
+            f = self.write_recipe(textwrap.dedent(r), tempdir)
-            d = tinfoil.parse_recipe_file(f.name)
+            d = tinfoil.parse_recipe_file(f)
             self.assertIn("wget-native", d.getVarFlag("do_fetch", "depends"))
             self.assertIn("lzip-native", d.getVarFlag("do_unpack", "depends"))
 
@@ -100,6 +101,6 @@ class Dependencies(OESelftestTestCase):
             LICENSE="CLOSED"
             SRC_URI="git://example.com/repo"
             """
-            f = self.write_recipe(textwrap.dedent(r))
+            f = self.write_recipe(textwrap.dedent(r), tempdir)
-            d = tinfoil.parse_recipe_file(f.name)
+            d = tinfoil.parse_recipe_file(f)
             self.assertIn("git-native", d.getVarFlag("do_fetch", "depends"))