bitbake: utils: add environment updating context manager

bb.utils.environment() is a context manager to alter os.environ inside
a specific block, restoring it after the block is closed.

(Bitbake rev: 9974848f67581ff7d76cef52a94f505af99b4932)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/bitbake/lib/bb/tests/utils.py b/bitbake/lib/bb/tests/utils.py
index a7ff33db52..4d5e21b99e 100644
--- a/bitbake/lib/bb/tests/utils.py
+++ b/bitbake/lib/bb/tests/utils.py
@@ -666,3 +666,21 @@ class GetReferencedVars(unittest.TestCase):
 
         layers = [{"SRC_URI"}, {"QT_GIT", "QT_MODULE", "QT_MODULE_BRANCH_PARAM", "QT_GIT_PROTOCOL"}, {"QT_GIT_PROJECT", "QT_MODULE_BRANCH", "BPN"}, {"PN", "SPECIAL_PKGSUFFIX"}]
         self.check_referenced("${SRC_URI}", layers)
+
+
+class EnvironmentTests(unittest.TestCase):
+    def test_environment(self):
+        os.environ["A"] = "this is A"
+        self.assertIn("A", os.environ)
+        self.assertEqual(os.environ["A"], "this is A")
+        self.assertNotIn("B", os.environ)
+
+        with bb.utils.environment(B="this is B"):
+            self.assertIn("A", os.environ)
+            self.assertEqual(os.environ["A"], "this is A")
+            self.assertIn("B", os.environ)
+            self.assertEqual(os.environ["B"], "this is B")
+
+        self.assertIn("A", os.environ)
+        self.assertEqual(os.environ["A"], "this is A")
+        self.assertNotIn("B", os.environ)