Adding an to make the pip wheel invocation more or less verbose

README.md

@@ -82,6 +82,7 @@ All being well, you should get wheels delivered to you in a few minutes.
 |---|---|---|
 | **Target wheels** | `CIBW_PLATFORM` | Override the auto-detected target platform |
 |   | `CIBW_SKIP` | Skip certain Python versions |
+| **Build parameters** | `CIBW_BUILD_VERBOSITY` | Increase or decrease the output of `pip wheel` |
 | **Build environment** | `CIBW_ENVIRONMENT` | Set environment variables needed during the build |
 |   | `CIBW_BEFORE_BUILD` | Execute a shell command preparing each wheel's build |
 |   | `CIBW_MANYLINUX1_X86_64_IMAGE` | Specify an alternative manylinx1 x86_64 docker image |
@@ -166,6 +167,16 @@ Examples:
 - Skip Python 3.6 on Linux: `cp36-manylinux*`
 - Only build on Python 3.6: `cp27-* cp34-* cp35-*`
 
+| Environment variable: `CIBW_BUILD_VERBOSITY`
+| ---
+
+Optional.
+
+An number from 1 to 3 to increase the level of verbosity (corresponding to invoking pip with `-v`, `-vv`, and `-vvv`), between -1 and -3 (`-q`, `-qq`, and `-qqq`), or just 0 (default verbosity). These flags are useful while debugging a build when the output of the actual build invoked by `pip wheel` is required.
+
+Platform-specific variants also available:
+`CIBW_BUILD_VERBOSITY_MACOS` | `CIBW_BUILD_VERBOSITY_WINDOWS` | `CIBW_BUILD_VERBOSITY_LINUX`
+
 | Environment variable: `CIBW_ENVIRONMENT`
 | ---
 

cibuildwheel/__main__.py

@@ -74,9 +74,15 @@ def main():
     test_requires = os.environ.get('CIBW_TEST_REQUIRES', '').split()
     project_dir = args.project_dir
     before_build = get_option_from_environment('CIBW_BEFORE_BUILD', platform=platform)
+    build_verbosity = get_option_from_environment('CIBW_BUILD_VERBOSITY', platform=platform) or ''
     skip_config = os.environ.get('CIBW_SKIP', '')
     environment_config = get_option_from_environment('CIBW_ENVIRONMENT', platform=platform) or ''
 
+    try:
+        build_verbosity = min(3, max(-3, int(build_verbosity)))
+    except ValueError:
+        build_verbosity = 0
+
     try:
         environment = parse_environment(environment_config)
     except (EnvironmentParseError, ValueError) as e:
@@ -118,6 +124,7 @@ def main():
         test_command=test_command,
         test_requires=test_requires,
         before_build=before_build,
+        build_verbosity=build_verbosity,
         skip=skip,
         environment=environment,
     )

cibuildwheel/linux.py

@@ -1,7 +1,7 @@
 from __future__ import print_function
 import os, subprocess, sys
 from collections import namedtuple
-from .util import prepare_command
+from .util import prepare_command, get_build_verbosity_flag
 
 try:
     from shlex import quote as shlex_quote
@@ -9,7 +9,7 @@ except ImportError:
     from pipes import quote as shlex_quote
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, skip, environment, manylinux1_images):
+def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, skip, environment, manylinux1_images):
     try:
         subprocess.check_call(['docker', '--version'])
     except:
@@ -66,7 +66,7 @@ def build(project_dir, package_name, output_dir, test_command, test_requires, be
                 fi
 
                 # Build that wheel
-                PATH="$PYBIN:$PATH" "$PYBIN/pip" wheel . -w /tmp/built_wheel --no-deps
+                PATH="$PYBIN:$PATH" "$PYBIN/pip" wheel . -w /tmp/built_wheel --no-deps {build_verbosity_flag}
                 built_wheel=(/tmp/built_wheel/*.whl)
 
                 # Delocate the wheel
@@ -108,6 +108,7 @@ def build(project_dir, package_name, output_dir, test_command, test_requires, be
             before_build=shlex_quote(
                 prepare_command(before_build, python='python', pip='pip', project='/project') if before_build else ''
             ),
+            build_verbosity_flag=get_build_verbosity_flag(build_verbosity),
             environment_exports='\n'.join(environment.as_shell_commands()),
         )
 

cibuildwheel/macos.py

@@ -7,10 +7,10 @@ try:
 except ImportError:
     from pipes import quote as shlex_quote
 
-from .util import prepare_command
+from .util import prepare_command, get_build_verbosity_flag
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, skip, environment):
+def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, skip, environment):
     PythonConfiguration = namedtuple('PythonConfiguration', ['version', 'identifier', 'url'])
     python_configurations = [
         PythonConfiguration(version='2.7', identifier='cp27-macosx_10_6_intel', url='https://www.python.org/ftp/python/2.7.14/python-2.7.14-macosx10.6.pkg'),
@@ -87,7 +87,7 @@ def build(project_dir, package_name, output_dir, test_command, test_requires, be
             call(before_build_prepared, env=env, shell=True)
 
         # build the wheel
-        call([pip, 'wheel', abs_project_dir, '-w', '/tmp/built_wheel', '--no-deps'], env=env)
+        call([pip, 'wheel', abs_project_dir, '-w', '/tmp/built_wheel', '--no-deps', get_build_verbosity_flag(build_verbosity)], env=env)
         built_wheel = glob('/tmp/built_wheel/*.whl')[0]
 
         if built_wheel.endswith('none-any.whl'):

cibuildwheel/util.py

@@ -13,6 +13,15 @@ def prepare_command(command, python, pip, project):
     return command.format(python=python, pip=pip, project=project)
 
 
+def get_build_verbosity_flag(level):
+    if level > 0:
+        return '-' + level * 'v'
+    elif level < 0:
+        return '-' + -level * 'q'
+    else:
+        return ''
+
+
 class BuildSkipper(object):
     def __init__(self, skip_config):
         self.patterns = skip_config.split()

cibuildwheel/windows.py

@@ -7,10 +7,10 @@ except ImportError:
 from collections import namedtuple
 from glob import glob
 
-from .util import prepare_command, Unbuffered
+from .util import prepare_command, get_build_verbosity_flag, Unbuffered
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, skip, environment):
+def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, skip, environment):
     # Python under AppVeyor/Windows seems to be buffering by default, giving problems interleaving subprocess call output with unflushed calls to 'print'
     sys.stdout.flush()
     sys.stdout = Unbuffered(sys.stdout)
@@ -82,7 +82,7 @@ def build(project_dir, package_name, output_dir, test_command, test_requires, be
             shell([before_build_prepared], env=env)
 
         # build the wheel
-        shell(['pip', 'wheel', abs_project_dir, '-w', built_wheel_dir, '--no-deps'], env=env)
+        shell(['pip', 'wheel', abs_project_dir, '-w', built_wheel_dir, '--no-deps', get_build_verbosity_flag(build_verbosity)], env=env)
         built_wheel = glob(built_wheel_dir+'/*.whl')[0]
 
         # install the wheel