Merge branch 'master' of github.com:joerick/cibuildwheel into deterministic-builds

# Conflicts:
#	cibuildwheel/__main__.py
#	cibuildwheel/linux.py
#	cibuildwheel/macos.py
#	cibuildwheel/windows.py

cibuildwheel/linux.py

@@ -68,7 +68,7 @@ def get_python_configurations(build_selector):
     return [c for c in python_configurations if matches_platform(c.identifier) and build_selector(c.identifier)]
 
 
-def build(project_dir, output_dir, test_command, test_requires, test_extras, before_build, build_verbosity, build_selector, repair_command, environment, manylinux_images, dependency_constraints):
+def build(project_dir, output_dir, test_command, before_test, test_requires, test_extras, before_build, build_verbosity, build_selector, repair_command, environment, manylinux_images, dependency_constraints):
     try:
         subprocess.check_call(['docker', '--version'])
     except Exception:
@@ -175,6 +175,10 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
 
                                 echo "Running tests using `which python`"
 
+                                if [ ! -z {before_build} ]; then
+                                    sh -c {before_build}
+                                fi
+
                                 # Install the wheel we just built
                                 # Note: If auditwheel produced two wheels, it's because the earlier produced wheel
                                 # conforms to multiple manylinux standards. These multiple versions of the wheel are
@@ -224,6 +228,9 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
                         environment_exports='\n'.join(environment.as_shell_commands()),
                         uid=os.getuid(),
                         gid=os.getgid(),
+                        before_test=shlex.quote(
+                            prepare_command(before_test, project='/project') if before_test else ''
+                        ),
                         dependency_install_flags='-c /constraints.txt' if dependency_constraints else '',
                     )
                 )