cmake/python: fix build race condition (#2111)

* python: remove MANIFEST

* cmake/python: fix build race condition

src/python/CMakeLists.txt

 # Copyright (c) PLUMgrid, Inc.
 # Licensed under the Apache License, Version 2.0 (the "License")
 
-set(PYTHON_SRC __init__.py perf.py tcp.py utils.py libbcc.py syscall.py table.py usdt.py)
-
-foreach (PY_SRC ${PYTHON_SRC})
-  configure_file(bcc/${PY_SRC} ${CMAKE_CURRENT_BINARY_DIR}/bcc/${PY_SRC} COPYONLY)
-endforeach()
-
 if(NOT PYTHON_CMD)
   set(PYTHON_CMD "python")
 endif()
 
-configure_file(setup.py.in ${CMAKE_CURRENT_BINARY_DIR}/setup.py @ONLY)
-configure_file(bcc/version.py.in ${CMAKE_CURRENT_BINARY_DIR}/bcc/version.py @ONLY)
 if(EXISTS "/etc/debian_version")
   set(PYTHON_FLAGS "${PYTHON_FLAGS} --install-layout deb")
 endif()
 
+file(GLOB_RECURSE PYTHON_SOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+  ${CMAKE_CURRENT_SOURCE_DIR}/*.py)
+file(GLOB_RECURSE PYTHON_INCLUDES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+  ${CMAKE_CURRENT_SOURCE_DIR}/*.py.in)
+
 foreach(PY_CMD ${PYTHON_CMD})
   string(REPLACE "/" "-" PY_CMD_ESCAPED ${PY_CMD})
-
-  set(PY_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bcc/__init__.py ${CMAKE_CURRENT_BINARY_DIR}/setup.py)
-  if (PREVIOUS_PY)
-    set(PY_DEPENDS ${PY_DEPENDS} ${PREVIOUS_PY})
-  endif()
-
-  set(PIP_INSTALLABLE "${CMAKE_CURRENT_BINARY_DIR}/dist-${PY_CMD_ESCAPED}/bcc-${REVISION}.tar.gz")
-  # build the pip installable
-  add_custom_command(OUTPUT ${PIP_INSTALLABLE}
-    COMMAND ${PY_CMD} setup.py sdist --dist-dir dist-${PY_CMD_ESCAPED}
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-    DEPENDS ${PY_DEPENDS}
-    )
+  set(PY_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bcc-${PY_CMD_ESCAPED})
+
+  foreach(PY_SRC ${PYTHON_SOURCES})
+    configure_file(${PY_SRC} ${PY_DIRECTORY}/${PY_SRC} COPYONLY)
+  endforeach()
+
+  foreach(PY_INC ${PYTHON_INCLUDES})
+    string(REPLACE ".py.in" ".py" PY_INC_REPLACED ${PY_INC})
+    configure_file(${PY_INC} ${PY_DIRECTORY}/${PY_INC_REPLACED} @ONLY)
+  endforeach()
+
+  set(PIP_INSTALLABLE "${PY_DIRECTORY}/dist/bcc-${REVISION}.tar.gz")
+  add_custom_command(
+    OUTPUT ${PIP_INSTALLABLE}
+    COMMAND ${PY_CMD} setup.py sdist
+    WORKING_DIRECTORY ${PY_DIRECTORY}
+    DEPENDS ${PYTHON_SOURCES} ${PYTHON_INCLUDES}
+    COMMENT "Building sdist for ${PY_CMD}"
+  )
   add_custom_target(bcc_py_${PY_CMD_ESCAPED} ALL DEPENDS ${PIP_INSTALLABLE})
 
-  install(CODE "execute_process(COMMAND ${PY_CMD} setup.py install -f ${PYTHON_FLAGS}
-    --prefix=${CMAKE_INSTALL_PREFIX} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})"
+  install(
+    CODE "
+      execute_process(
+        COMMAND ${PY_CMD} setup.py install -f ${PYTHON_FLAGS} --prefix=${CMAKE_INSTALL_PREFIX}
+        WORKING_DIRECTORY ${PY_DIRECTORY})"
     COMPONENT python)
-
-  set(PREVIOUS_PY ${PIP_INSTALLABLE})
 endforeach()

src/python/MANIFEST

-# file GENERATED by distutils, do NOT edit
-setup.py
-bcc/__init__.py
-bcc/table.py
-bcc/libbcc.py