Defaulting to built-in capnproto

- Adding code to detect if bundled capnproto is already built

.github/workflows/pythonpackage.yml

@@ -25,15 +25,9 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt
-        # Install capnproto
-        curl -O https://capnproto.org/capnproto-c++-0.7.0.tar.gz
-        tar zxf capnproto-c++-0.7.0.tar.gz
-        cd capnproto-c++-0.7.0
-        ./configure
-        make -j check
-        sudo make install
     - name: Build pycapnp and install
       run: |
+        python setup.py build # Not necessary, but shows output on stdout
         pip install .
     - name: Lint with flake8
       run: |

buildutils/build.py

@@ -13,7 +13,10 @@ def build_libcapnp(bundle_dir, build_dir, verbose=False):
     capnp_dir = os.path.join(bundle_dir, 'capnproto-c++')
     build_dir = os.path.abspath(build_dir)
     tmp_dir = os.path.join(capnp_dir, 'build')
-    if not os.path.exists(tmp_dir):
+
+    # Clean the tmp build directory every time
+    if os.path.exists(tmp_dir):
+        shutil.rmtree(tmp_dir)
     os.mkdir(tmp_dir)
 
     cxxflags = os.environ.get('CXXFLAGS', None)
@@ -38,7 +41,7 @@ def build_libcapnp(bundle_dir, build_dir, verbose=False):
     conf = subprocess.Popen(args, cwd=tmp_dir, stdout=sys.stdout)
     returncode = conf.wait()
     if returncode != 0:
-        raise RuntimeError('CMake failed')
+        raise RuntimeError('CMake failed {}'.format(returncode))
 
     # Run build through cmake
     build = subprocess.Popen([
@@ -54,4 +57,4 @@ def build_libcapnp(bundle_dir, build_dir, verbose=False):
     else:
         os.environ['CXXFLAGS'] = cxxflags
     if returncode != 0:
-        raise RuntimeError('capnproto compilation failed')
+        raise RuntimeError('capnproto compilation failed: {}'.format(returncode))

setup.py

@@ -141,9 +141,18 @@ class build_libcapnp_ext(build_ext_c):
             build_dir = os.path.join(_this_dir, "build")
             if not os.path.exists(build_dir):
                 os.mkdir(build_dir)
-            fetch_libcapnp(bundle_dir, libcapnp_url)
 
+            # Check if we've already built capnproto
+            capnp_bin = os.path.join(build_dir, 'bin', 'capnp')
+            if os.name == 'nt':
+                capnp_bin = os.path.join(build_dir, 'bin', 'capnp.exe')
+
+            if not os.path.exists(capnp_bin):
+                # Not built, fetch and build
+                fetch_libcapnp(bundle_dir, libcapnp_url)
                 build_libcapnp(bundle_dir, build_dir)
+            else:
+                info("capnproto already built at {}".format(build_dir))
 
             self.include_dirs += [os.path.join(build_dir, 'include')]
             self.library_dirs += [os.path.join(build_dir, 'lib')]