Replace setuptools with skbuild

Replace setuptools with scikit-build [1]

Scikit-build is a nice alternatives to raw setuptools when building
native-extensions, and a perfect fit for a project with segyio's
structure. There is a minor breaking change for some build routines -
the python setup script is moved the the python/ directory. This does
not come without benefits:

1. The python project can now be completely oblivious, save the root
   cmake file, to the fact that it's a part of a larger repository, and
   behaves like most python projects
2. cmake is used to build the extension, which means compiler options
   and configs can be set in a more ergonomic manner
3. Because cmake and scikit now manages the compiler setup and binary
   compatibility, compiler support might just be extended, even for
   Windows. segyio no longer has to maintain or deal with these details,
   and can leave it to scikit-build

[1] https://github.com/scikit-build/scikit-build

.travis.yml

@@ -73,7 +73,8 @@ install:
         brew update && brew install cppcheck;
     fi
   - pip install -r requirements.txt
-  - pip install bandit setuptools setuptools-scm pytest pytest-runner sphinx
+  - pip install setuptools setuptools-scm scikit-build
+  - pip install bandit pytest pytest-runner sphinx
 
 before_script:
   - enabled="-DBUILD_PYTHON=OFF -DBUILD_MEX=OFF"
@@ -111,9 +112,12 @@ script:
   - $SCAN make && ctest --output-on-failure
   - sudo make install
   - popd
-  - build_wheel . $PLAT
+  # install works, so remove the _skbuild because it having root permissions
+  # from make install breaks build_wheel
+  - sudo rm -rf python/_skbuild
+  - build_wheel python $PLAT
   - install_run $PLAT
-  - mv wheelhouse dist
+  - mv wheelhouse python/dist
 
 before_deploy:
   # OS X ships with a tar that doesn't support --exclude-vcs, which is
@@ -128,10 +132,14 @@ before_deploy:
       tar --exclude-vcs -C $TRAVIS_BUILD_DIR -czvf segyio-$VERSION.tar.gz segyio-$VERSION;
       zip --exclude *.git -r segyio-$VERSION.zip $TRAVIS_BUILD_DIR/segyio-$VERSION/*;
     fi
+  - pushd python
   - if [[ $SOURCEDEPLOY ]]; then
       rm -rf dist;
     fi
 
+after_deploy:
+  - popd
+
 deploy:
     - provider: pypi # source distribution (done from linux python 3.6 only)
       skip_cleanup: true
@@ -147,7 +155,7 @@ deploy:
       skip_cleanup: true
       skip_upload_docs: true
       user: statoil-travis
-      distributions: build
+      distributions: --skip-cmake build
       password:
         secure: 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
       on:

appveyor.yml

@@ -39,38 +39,40 @@ install:
     - IF DEFINED PYTHON (IF "%platform%" == "x64" SET PYTHON=%PYTHON%-x64)
     - IF DEFINED PYTHON SET PATH=%PYTHON%;%PYTHON%\Scripts;%PATH%
     - IF DEFINED PYTHON pip install -r requirements.txt
-    - IF DEFINED PYTHON pip install twine wheel pytest pytest-runner
+    - IF DEFINED PYTHON pip install
+        twine
+        wheel
+        setuptools
+        setuptools-scm
+        pytest
+        pytest-runner
+        scikit-build
 
 before_build:
     - IF DEFINED PYTHON SET LANG=%LANG% -DPYTHON_EXECUTABLE=%PYTHON%\python
+    - set generator="Visual Studio 14 2015"
+    - IF "%platform%" == "x64" set generator="Visual Studio 14 2015 Win64"
     - git fetch --tags
 
-# python extensions with setup.py typically requires building with the same
-# compiler as python itself, but it seems that the extern C does a reasonable
-# job of keeping it binary compatible. For python < 3.0, copy the shared lib
-# into the build directory (because otherwise visual c++ 9.0 is invoked, and it
-# supports no C99. For newer pythons, setup.py is capable of building segyio
 build_script:
-    - cmake --version
-    - IF "%platform%" == "x64" set W64="-GVisual Studio 14 2015 Win64"
     - mkdir build
     - ps: pushd build
     - cmake %APPVEYOR_BUILD_FOLDER%
-            %W64%
+            -G %generator%
             %MEX%
             %LANG%
             -DCMAKE_INSTALL_PREFIX=%INSTALL_DIR%
-            -DBUILD_SHARED_LIBS=ON
+            -DCMAKE_CXX_FLAGS="/D_CRT_SECURE_NO_WARNINGS /EHsc"
     - cmake --build . --config "%configuration%" --target install
     - ctest -C "%configuration%" --output-on-failure
     - ps: popd
-    - ps: pushd build/python
-    - IF DEFINED PYTHON python %APPVEYOR_BUILD_FOLDER%/setup.py bdist_wheel
+    - ps: pushd python
+    - IF DEFINED PYTHON python setup.py bdist_wheel -G %generator%
     - ps: popd
 
 test_script:
     - set PATH=%INSTALL_DIR%\bin;%PATH%
-    - ps: pushd build/python
+    - ps: pushd python
     - IF DEFINED PYTHON FOR /F "tokens=*" %%G IN ('dir /b dist\*.whl') DO
         pip install dist/%%G
     - ps: popd
@@ -79,7 +81,7 @@ test_script:
     - IF DEFINED PYTHON python python/examples/scan_min_max.py test-data/small.sgy
 
 before_deploy:
-    - ps: pushd build/python
+    - ps: pushd python
 
 after_deploy:
     - ps: popd

config.sh

@@ -14,13 +14,31 @@ function pre_build {
 
     # the cmakes available in yum for centos5 are too old (latest 2.11.x), so
     # fetch a newer version pypi
-    python -m pip install cmake
+    python -m pip install cmake scikit-build
 
     mkdir build-centos5
     pushd build-centos5
 
     cmake --version
-    cmake .. -DBUILD_PYTHON=OFF -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON
-    make install
+    cmake -DBUILD_PYTHON=OFF \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DBUILD_SHARED_LIBS=ON \
+          -DCMAKE_INSTALL_NAME_DIR=/usr/local/lib \
+          ..
+
+    if [ -n "$IS_OSX" ]; then
+        sudo make install;
+    else
+        make install;
+    fi
+
     popd
+
+    # clean dirty files from python/, otherwise it picks up the one built
+    # outside docker and symbols will be too recent for auditwheel.
+    # setuptools_scm really *really* expects a .git-directory. As the wheel
+    # building process does its work in /tmp, setuptools_scm crashes because it
+    # cannot find the .git dir. Leave version.py so that setuptools can obtain
+    # the version from it
+    git clean -dxf python --exclude python/segyio/version.py
 }

lib/CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 3.5)
 project(libsegyio C CXX)
 
+set(SEGYIO_LIB_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH "")
+
 set(CMAKE_CXX_STANDARD 11)
 
 add_library(segyio src/segy.c)