Fix incompatibility with RPM 4.20

RPM 4.20 creates a different BUILD directory structure than RPM 4.19
and earlier.

To avoid reliance on any particular BUILD directory strucure, create
build subdir with %setup and then search BUILD directory to find the
actual location of build subdir.

test/mvn_macros_test.py

@@ -379,7 +379,7 @@ def test_mvn_install(self, pack):
         _, stderr, return_value = pack.run_install()
         self.assertEqual(return_value, 0, stderr)
 
-        argspath = os.path.join('rpmbuild', 'BUILD', '.xmvn', 'install-out')
+        argspath = os.path.join(pack.buildpath, '.xmvn', 'install-out')
         with open(argspath, 'r') as argsfile:
             args = argsfile.read()
             self.assertTrue(re.match(r'-R \.xmvn-reactor -n \S+ -d \S+\n',
@@ -392,29 +392,29 @@ def test_mvn_install_debug(self, pack):
         _, stderr, return_value = pack.run_install()
         self.assertEqual(return_value, 0, stderr)
 
-        argspath = os.path.join('rpmbuild', 'BUILD', '.xmvn', 'install-out')
+        argspath = os.path.join(pack.buildpath, '.xmvn', 'install-out')
         with open(argspath, 'r') as argsfile:
             args = argsfile.read()
             self.assertTrue(re.match(r'-X -R \.xmvn-reactor -n \S+ -d \S+\n',
                                      args), args)
 
     @rpm_test()
     def test_mvn_install_directory(self, pack):
-        pack.append_to_build('mkdir ../doc')
-        pack.append_to_build('touch ../doc/file')
+        pack.append_to_build('mkdir doc')
+        pack.append_to_build('touch doc/file')
         pack.append_to_install('%mvn_install -J doc')
         pack.append_to_install('%files -f .mfiles-javadoc')
 
         _, stderr, return_value = pack.run_install()
         self.assertEqual(return_value, 0, stderr)
 
-        argspath = os.path.join('rpmbuild', 'BUILD', '.xmvn', 'install-out')
+        argspath = os.path.join(pack.buildpath, '.xmvn', 'install-out')
         with open(argspath, 'r') as argsfile:
             args = argsfile.read()
             self.assertTrue(re.match(r'-R \.xmvn-reactor -n \S+ -d \S+\n',
                                      args), args)
 
-        mfilespath = os.path.join('rpmbuild', 'BUILD', '.mfiles-javadoc')
+        mfilespath = os.path.join(pack.buildpath, '.mfiles-javadoc')
         with open(mfilespath, 'r') as mfiles:
             self.assertEqual(mfiles.read(),
                              '/usr/share/javadoc/test_mvn_install_directory\n')

test/pom_macros_test.py

@@ -22,10 +22,10 @@ def test_decorated(self, *args, **kwargs):
             pomname = os.path.basename(pom)
             package = Package(function.__name__)
             package.add_source(pompath)
-            pomsourcepath = os.path.join(package.buildpath, pomname)
             package.append_to_prep('%{command} {pom} {tail}'.format(command=command,
                 pom=pomname, tail=tail))
             stdin, stderr, return_value = package.run_prep()
+            pomsourcepath = os.path.join(package.buildpath, pomname)
 
             function(self, stdin, stderr, return_value, pomsourcepath)
         return test_decorated

test/test_rpmbuild.py

@@ -4,6 +4,7 @@
 import sys
 import subprocess
 import shutil
+import glob
 
 from textwrap import dedent
 
@@ -27,7 +28,8 @@ def __init__(self, name):
         self.__prep = ''
         self.__build = ''
         self.__install = ''
-        self.buildpath = os.path.join('rpmbuild', 'BUILD', name + '-1')
+        # buildpath is set after running prep, it is not known in advance
+        self.buildpath = None
         self.__env = dict(os.environ)
         self.__env['HOME'] = os.getcwd()
         self.__env['PATH'] = '{mock}:{path}'.format(mock=DIRPATH,
@@ -97,6 +99,10 @@ def __invoke_rpmbuild(self, args):
         err = errfile.read()
         os.remove('tmpout')
         os.remove('tmperr')
+        # RPM 4.19 and 4.20 use different BUILD directory structure, thus we search the filesystem
+        # to find the actual location of build subdir without reliance on particular structure
+        self.buildpath = glob.glob('rpmbuild/BUILD/**/{name}-subdir'.format(name=self.__name),
+                                   recursive=True)[0]
         return (out, err, ret)
 
     def set_env(self, name, value):
@@ -139,8 +145,7 @@ def __prepare_spec(self):
         prep_section = dedent("""\
 
         %prep
-        mkdir %{name}-%{version}
-        cd ./%{name}-%{version}
+        %setup -cTn %{name}-subdir
         """)
         for index, (_, filename) in enumerate(self.__sources):
             directory = os.path.dirname(filename)
@@ -153,7 +158,6 @@ def __prepare_spec(self):
         build_section = dedent("""\
 
         %build
-        cd ./%{name}-%{version}
         """)
         build_section += self.__build