cmake: directly build the rust datapack libraries

Summary:
Update Eden's top-level CMakeLists.txt file to build the Rust datapack
libraries.  Previously these were built by invoking CMake separately inside th
`eden/scm` subdirectory.  Now that the code has been combined into a single
location we can use a single CMake invocation to drive the build of both these
components.

The old code did not build the Rust datapack code on Windows, and this diff
does not change that behavior.  I'm not aware of any reason to skip building
this on Windows, so I plan to enable building this code on Windows in a
subsequent diff.

Reviewed By: pkaush

Differential Revision: D18588006

fbshipit-source-id: 20f4f0ea9fef8595a9dd35a21115952b2808c824

CMake/EdenConfigChecks.cmake

@@ -100,8 +100,7 @@ if (WIN32)
 endif()
 
 if (NOT WIN32)
-  find_package(mercurial CONFIG QUIET)
-  set(EDEN_HAVE_RUST_DATAPACK ${mercurial_FOUND})
+    set(EDEN_HAVE_RUST_DATAPACK ON)
 endif()
 
 set(EDEN_HAVE_MONONOKE OFF)

CMakeLists.txt

@@ -23,8 +23,8 @@ list(APPEND CMAKE_PREFIX_PATH "${CMAKE_CURRENT_SOURCE_DIR}/external/install")
 
 # CMake include directories
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMake"
-  # For in-fbsource builds on mac
-  "${CMAKE_CURRENT_SOURCE_DIR}/../opensource/fbcode_builder/CMake"
+  # Eventually the files in eden/scm/CMake/ should be moved to CMake/
+  "${CMAKE_CURRENT_SOURCE_DIR}/eden/scm/CMake"
   # For shipit-transformed builds
   "${CMAKE_CURRENT_SOURCE_DIR}/build/fbcode_builder/CMake"
   ${CMAKE_MODULE_PATH})
@@ -57,6 +57,7 @@ endif()
 include(EdenConfigChecks)
 include(FBPythonBinary)
 include(FBThriftLibrary)
+include(RustStaticLibrary)
 
 include_directories(BEFORE ${CMAKE_CURRENT_BINARY_DIR})
 
@@ -72,6 +73,9 @@ add_subdirectory(eden/cli)
 add_subdirectory(eden/fs)
 add_subdirectory(eden/integration)
 add_subdirectory(eden/py)
+if (NOT WIN32)
+  add_subdirectory(eden/scm/lib)
+endif()
 add_subdirectory(eden/test_support)
 
 configure_file(

eden/fs/store/hg/CMakeLists.txt

@@ -17,25 +17,19 @@ add_library(
     ${STORE_HG_SRCS}
 )
 
-list(
-  APPEND EDEN_STORE_HG_OPTIONAL_DEPS
-    datapack
-    eden_config
-)
 if (NOT WIN32)
   list(APPEND EDEN_STORE_HG_OPTIONAL_DEPS eden_store_mononoke)
 endif()
 
 if(EDEN_HAVE_RUST_DATAPACK)
-  list(
-    APPEND EDEN_STORE_HG_OPTIONAL_DEPS
-      Mercurial::backingstore
-  )
+  list(APPEND EDEN_STORE_HG_OPTIONAL_DEPS backingstore)
 endif()
 
 target_link_libraries(
   eden_store_hg
   PUBLIC
+    datapack
+    eden_config
     eden_model
     eden_store
     eden_utils