pass meson source and build dirs as env variables for postconf scripts

mesonbuild/backend/backends.py

@@ -438,6 +438,12 @@ class Backend():
         return (srcs, ofilenames, cmd)
 
     def run_postconf_scripts(self):
+        env = {'MESON_SOURCE_ROOT' : self.environment.get_source_dir(),
+               'MESON_BUILD_ROOT' : self.environment.get_build_dir()
+              }
+        child_env = os.environ.copy()
+        child_env.update(env)
+
         for s in self.build.postconf_scripts:
-            cmd = s['exe'].get_command() + [self.environment.get_source_dir(), self.environment.get_build_dir()] + s['args']
-            subprocess.check_call(cmd)
+            cmd = s['exe'].get_command() + s['args']
+            subprocess.check_call(cmd, env=child_env)

test cases/common/107 postconf/postconf.py

@@ -7,5 +7,5 @@ template = '''#pragma once
 #define THE_NUMBER {}
 '''
 
-data = open(os.path.join(sys.argv[1], 'raw.dat')).readline().strip()
-open(os.path.join(sys.argv[2], 'generated.h'), 'w').write(template.format(data))
+data = open(os.path.join(os.environ['MESON_SOURCE_ROOT'], 'raw.dat')).readline().strip()
+open(os.path.join(os.environ['MESON_BUILD_ROOT'], 'generated.h'), 'w').write(template.format(data))

test cases/common/108 postconf with args/postconf.py

@@ -9,5 +9,5 @@ template = '''#pragma once
 #define THE_ARG2 {}
 '''
 
-data = open(os.path.join(sys.argv[1], 'raw.dat')).readline().strip()
-open(os.path.join(sys.argv[2], 'generated.h'), 'w').write(template.format(data, sys.argv[3], sys.argv[4]))
+data = open(os.path.join(os.environ['MESON_SOURCE_ROOT'], 'raw.dat')).readline().strip()
+open(os.path.join(os.environ['MESON_BUILD_ROOT'], 'generated.h'), 'w').write(template.format(data, sys.argv[1], sys.argv[2]))