selftest/buildhistory.py: Test buildhistory does not change sigs

[YOCTO #5953] Add a test to ensure buildhistory does not
change signatures.

Also removed unused imports.

(From OE-Core rev: 9e8f5ff6b0bd6cffcbb991d75487ab6005974000)

Signed-off-by: Daniel Istrate <daniel.alexandrux.istrate@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/buildhistory.py

@@ -1,12 +1,10 @@
-import unittest
 import os
 import re
-import shutil
 import datetime
 
-import oeqa.utils.ftools as ftools
 from oeqa.selftest.base import oeSelfTest
-from oeqa.utils.commands import Command, runCmd, bitbake, get_bb_var, get_test_layer
+from oeqa.utils.commands import bitbake, get_bb_var
+from oeqa.utils.decorators import testcase
 
 
 class BuildhistoryBase(oeSelfTest):
@@ -43,3 +41,66 @@ class BuildhistoryBase(oeSelfTest):
             self.assertTrue(search_for_error, msg="Could not find desired error in output: %s" % error_regex)
         else:
             self.assertEqual(result.status, 0, msg="Command 'bitbake %s' has failed unexpectedly: %s" % (target, result.output))
+
+    @testcase(1386)
+    def test_buildhistory_does_not_change_signatures(self):
+        """
+        Summary:     Ensure that buildhistory does not change signatures
+        Expected:    Only 'do_rootfs' and 'do_build' tasks are rerun
+        Product:     oe-core
+        Author:      Daniel Istrate <daniel.alexandrux.istrate@intel.com>
+        AutomatedBy: Daniel Istrate <daniel.alexandrux.istrate@intel.com>
+        """
+
+        tmpdir1_name = 'tmpsig1'
+        tmpdir2_name = 'tmpsig2'
+        builddir = os.environ.get('BUILDDIR')
+        tmpdir1 = os.path.join(builddir, tmpdir1_name)
+        tmpdir2 = os.path.join(builddir, tmpdir2_name)
+
+        self.track_for_cleanup(tmpdir1)
+        self.track_for_cleanup(tmpdir2)
+
+        features = 'TMPDIR = "%s"\n' % tmpdir1
+        self.write_config(features)
+        bitbake('core-image-sato -S none')
+
+        features = 'TMPDIR = "%s"\n' % tmpdir2
+        features += 'INHERIT += "buildhistory"\n'
+        self.write_config(features)
+        bitbake('core-image-sato -S none')
+
+        def get_files(d):
+            f = []
+            for root, dirs, files in os.walk(d):
+                for name in files:
+                    f.append(os.path.join(root, name))
+            return f
+
+        files1 = get_files(tmpdir1 + '/stamps')
+        files2 = get_files(tmpdir2 + '/stamps')
+        files2 = [x.replace(tmpdir2_name, tmpdir1_name) for x in files2]
+
+        f1 = set(files1)
+        f2 = set(files2)
+        sigdiff = f1 - f2
+
+        self.assertEqual(len(sigdiff), 2, 'Expected 2 signature differences. Out: %s' % list(sigdiff))
+
+        unexpected_diff = []
+
+        # No new signatures should appear apart from do_rootfs and do_build
+        found_do_rootfs_flag = False
+        found_do_build_flag = False
+
+        for sig in sigdiff:
+            if 'do_rootfs' in sig:
+                found_do_rootfs_flag = True
+            elif 'do_build' in sig:
+                found_do_build_flag = True
+            else:
+                unexpected_diff.append(sig)
+
+        self.assertTrue(found_do_rootfs_flag, 'Task do_rootfs did not rerun.')
+        self.assertTrue(found_do_build_flag, 'Task do_build did not rerun')
+        self.assertFalse(unexpected_diff, 'Found unexpected signature differences. Out: %s' % unexpected_diff)