[PATCH] oeqa/selftest/sstatetests: Add test that MACHINE doesn't change target sigs

[Richard Purdie <richard.purdie@linuxfoundation.org>]

When we change between two machines with the same tune, we shouldn't see 
rebuilds of binaries. This adds a test for this using the qemux86copy 
machine. We also extend the test to cover multilibs.

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

diff --git a/meta/lib/oeqa/selftest/sstatetests.py b/meta/lib/oeqa/selftest/sstatetests.py
index 1940e66..af68e02 100644
--- a/meta/lib/oeqa/selftest/sstatetests.py
+++ b/meta/lib/oeqa/selftest/sstatetests.py
@@ -329,4 +329,49 @@ MACHINE = \"qemuarm\"
         files2 = [x.replace("tmp-sstatesamehash2", "tmp-sstatesamehash") for x in files2]
         self.maxDiff = None
         self.assertItemsEqual(files1, files2)
-        
+
+    def test_sstate_sametune_samesigs(self):
+        """
+        The sstate checksums of two identical machines (using the same tune) should be the 
+        same, apart from changes within the machine specific stamps directory. We use the
+        qemux86copy machine to test this. Also include multilibs in the test.
+        """
+
+        topdir = get_bb_var('TOPDIR')
+        targetos = get_bb_var('TARGET_OS')
+        targetvendor = get_bb_var('TARGET_VENDOR')
+        self.write_config("""
+TMPDIR = \"${TOPDIR}/tmp-sstatesamehash\"
+MACHINE = \"qemux86\"
+require conf/multilib.conf
+MULTILIBS = "multilib:lib32"
+DEFAULTTUNE_virtclass-multilib-lib32 = "x86"
+""")
+        self.track_for_cleanup(topdir + "/tmp-sstatesamehash")
+        bitbake("world meta-toolchain -S none")
+        self.write_config("""
+TMPDIR = \"${TOPDIR}/tmp-sstatesamehash2\"
+MACHINE = \"qemux86copy\"
+require conf/multilib.conf
+MULTILIBS = "multilib:lib32"
+DEFAULTTUNE_virtclass-multilib-lib32 = "x86"
+""")
+        self.track_for_cleanup(topdir + "/tmp-sstatesamehash2")
+        bitbake("world meta-toolchain -S none")
+
+        def get_files(d):
+            f = []
+            for root, dirs, files in os.walk(d):
+                for name in files:
+                    if "meta-environment" in root or "cross-canadian" in root:
+                        continue
+                    if "qemux86copy-" in root or "qemux86-" in root:
+                        continue
+                    if "do_build" not in name and "do_populate_sdk" not in name:
+                        f.append(os.path.join(root, name))
+            return f
+        files1 = get_files(topdir + "/tmp-sstatesamehash/stamps")
+        files2 = get_files(topdir + "/tmp-sstatesamehash2/stamps")
+        files2 = [x.replace("tmp-sstatesamehash2", "tmp-sstatesamehash") for x in files2]
+        self.maxDiff = None
+        self.assertItemsEqual(files1, files2)