Switch to using build (instead of pep517)

.cirrus.yml

@@ -11,6 +11,7 @@ Lint_task:
   container:
     image: python:3.8-slim
   install_script:
+    - pip install -U --upgrade-strategy eager pip 'setuptools>42'
     - pip install .
     - pip install .[testing]
   script:
@@ -23,6 +24,7 @@ Zipapp_bootstrap_task:
       image: python:3.7-slim
       image: python:3.8-slim
   setup_script:
+    - pip install -U --upgrade-strategy eager pip 'setuptools>42'
     - cp -r . /tmp/bork-pristine
     - cp -r /tmp/bork-pristine /tmp/pass1
     - cp -r /tmp/bork-pristine /tmp/pass2
@@ -56,6 +58,7 @@ Linux_task:
   install_script:
     - apt-get update
     - apt-get install -y git
+    - pip install -U --upgrade-strategy eager pip 'setuptools>42'
     - pip install . .[testing]
   script:
     - python3 --version
@@ -78,6 +81,7 @@ macOS_task:
     - pyenv install ${PYTHON}
     - pyenv global ${PYTHON}
     - pyenv rehash
+    - pip install -U --upgrade-strategy eager pip 'setuptools>42'
     - pip install -e .[testing]
   script:
     - python3 --version
@@ -94,6 +98,7 @@ FreeBSD_task:
     - PY=`echo $PYTHON | tr -d '.'`
     - pkg install -y python${PY} py${PY}-setuptools git
     - python${PYTHON} -m ensurepip
+    - python${PYTHON} -m pip install -U --upgrade-strategy eager pip 'setuptools>42'
     - python${PYTHON} -m pip install -e .[testing_only]
   script:
     - python${PYTHON} --version
@@ -133,6 +138,7 @@ Release_task:
   install_script:
     - apt-get update
     - apt-get install -y git
+    - pip install -U --upgrade-strategy eager pip 'setuptools>42'
     - pip3 install . .[testing]
   build_script:
     - bork clean

bork/builder.py

@@ -4,7 +4,7 @@
 # Slight kludge so we can have a function named zipapp().
 import zipapp as Zipapp  # noqa: N812
 
-import pep517.build  # type: ignore
+import build
 import toml
 
 from .filesystem import load_setup_cfg, try_delete
@@ -19,10 +19,9 @@
 def dist():
     """Build the sdist and wheel distributions."""
 
-    # We can use the pep517 library to add separate source and binary build
-    # functions, but I'm leaving that alone unless someone asks for it.
-    args = ['--source', '--binary']
-    pep517.build.main(pep517.build.parser.parse_args(['.', *args]))
+    builder = build.ProjectBuilder('.')
+    builder.build('sdist', './dist/')
+    builder.build('wheel', './dist/')
 
 
 def _package_name():

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 # Specify the required build system.
-requires = ["setuptools", "wheel"]
+requires = ["setuptools > 42", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.bork]

setup.cfg

@@ -27,9 +27,10 @@ python_requires = >=3.6
 # The importlib_metadata library is required by Twine for Python 3.7 and
 # earlier, but we pull it in unconditionally so the zipapp is version-agnostic.
 install_requires =
+    wheel==0.36.2
+    build==0.1.0
     packaging==20.8
     toml==0.10.2
-    pep517==0.9.1
     twine==3.3.0
     click==7.1.2
     coloredlogs==15.0