thodg/libgit2/cmake/SelectHTTPSBackend.cmake

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• Hash : bc02bcd9
  Author :
  Date : 2020-04-03T19:51:22
  

  cmake: move modules into the "cmake/" top level dir
  
  Our custom CMake module currently live in "cmake/Modules". As the
  "cmake/" directory doesn't contain anything except the "Modules"
  directory, it doesn't really make sense to have the additional
  intermediate directory. So let's instead move the modules one level up
  into the "cmake/" top level directory.
  

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• cmake/SelectHTTPSBackend.cmake

• INCLUDE(SanitizeBool)
  
  # We try to find any packages our backends might use
  FIND_PACKAGE(OpenSSL)
  FIND_PACKAGE(mbedTLS)
  IF (CMAKE_SYSTEM_NAME MATCHES "Darwin")
  	FIND_PACKAGE(Security)
  	FIND_PACKAGE(CoreFoundation)
  ENDIF()
  
  IF(USE_HTTPS)
  	# Auto-select TLS backend
  	SanitizeBool(USE_HTTPS)
  	IF (USE_HTTPS STREQUAL ON)
  		IF (SECURITY_FOUND)
  			IF (SECURITY_HAS_SSLCREATECONTEXT)
  				SET(USE_HTTPS "SecureTransport")
  			ELSE()
  				MESSAGE(STATUS "Security framework is too old, falling back to OpenSSL")
  				SET(USE_HTTPS "OpenSSL")
  			ENDIF()
  		ELSEIF (WINHTTP)
  			SET(USE_HTTPS "WinHTTP")
  		ELSEIF(OPENSSL_FOUND)
  			SET(USE_HTTPS "OpenSSL")
  		ELSEIF(MBEDTLS_FOUND)
  			SET(USE_HTTPS "mbedTLS")
  		ELSE()
  			MESSAGE(FATAL_ERROR "Unable to autodetect a usable HTTPS backend."
  				"Please pass the backend name explicitly (-DUSE_HTTPS=backend)")
  		ENDIF()
  	ENDIF()
  
  	# Check that we can find what's required for the selected backend
  	IF (USE_HTTPS STREQUAL "SecureTransport")
  		IF (NOT COREFOUNDATION_FOUND)
  			MESSAGE(FATAL_ERROR "Cannot use SecureTransport backend, CoreFoundation.framework not found")
  		ENDIF()
  		IF (NOT SECURITY_FOUND)
  			MESSAGE(FATAL_ERROR "Cannot use SecureTransport backend, Security.framework not found")
  		ENDIF()
  		IF (NOT SECURITY_HAS_SSLCREATECONTEXT)
  			MESSAGE(FATAL_ERROR "Cannot use SecureTransport backend, SSLCreateContext not supported")
  		ENDIF()
  
  		SET(GIT_SECURE_TRANSPORT 1)
  		LIST(APPEND LIBGIT2_SYSTEM_INCLUDES ${SECURITY_INCLUDE_DIR})
  		LIST(APPEND LIBGIT2_LIBS ${COREFOUNDATION_LDFLAGS} ${SECURITY_LDFLAGS})
  		LIST(APPEND LIBGIT2_PC_LIBS ${COREFOUNDATION_LDFLAGS} ${SECURITY_LDFLAGS})
  	ELSEIF (USE_HTTPS STREQUAL "OpenSSL")
  		IF (NOT OPENSSL_FOUND)
  			MESSAGE(FATAL_ERROR "Asked for OpenSSL TLS backend, but it wasn't found")
  		ENDIF()
  
  		SET(GIT_OPENSSL 1)
  		LIST(APPEND LIBGIT2_SYSTEM_INCLUDES ${OPENSSL_INCLUDE_DIR})
  		LIST(APPEND LIBGIT2_LIBS ${OPENSSL_LIBRARIES})
  		LIST(APPEND LIBGIT2_PC_LIBS ${OPENSSL_LDFLAGS})
  		LIST(APPEND LIBGIT2_PC_REQUIRES "openssl")
  	ELSEIF(USE_HTTPS STREQUAL "mbedTLS")
  		IF (NOT MBEDTLS_FOUND)
  			MESSAGE(FATAL_ERROR "Asked for mbedTLS backend, but it wasn't found")
  		ENDIF()
  
  		IF(NOT CERT_LOCATION)
  			MESSAGE(STATUS "Auto-detecting default certificates location")
  			IF(CMAKE_SYSTEM_NAME MATCHES Darwin)
  				# Check for an Homebrew installation
  				SET(OPENSSL_CMD "/usr/local/opt/openssl/bin/openssl")
  			ELSE()
  				SET(OPENSSL_CMD "openssl")
  			ENDIF()
  			EXECUTE_PROCESS(COMMAND ${OPENSSL_CMD} version -d OUTPUT_VARIABLE OPENSSL_DIR OUTPUT_STRIP_TRAILING_WHITESPACE)
  			IF(OPENSSL_DIR)
  				STRING(REGEX REPLACE "^OPENSSLDIR: \"(.*)\"$" "\\1/" OPENSSL_DIR ${OPENSSL_DIR})
  
  				SET(OPENSSL_CA_LOCATIONS
  					"ca-bundle.pem"             # OpenSUSE Leap 42.1
  					"cert.pem"                  # Ubuntu 14.04, FreeBSD
  					"certs/ca-certificates.crt" # Ubuntu 16.04
  					"certs/ca.pem"              # Debian 7
  				)
  				FOREACH(SUFFIX IN LISTS OPENSSL_CA_LOCATIONS)
  					SET(LOC "${OPENSSL_DIR}${SUFFIX}")
  					IF(NOT CERT_LOCATION AND EXISTS "${OPENSSL_DIR}${SUFFIX}")
  						SET(CERT_LOCATION ${LOC})
  					ENDIF()
  				ENDFOREACH()
  			ELSE()
  				MESSAGE(FATAL_ERROR "Unable to find OpenSSL executable. Please provide default certificate location via CERT_LOCATION")
  			ENDIF()
  		ENDIF()
  
  		IF(CERT_LOCATION)
  			IF(NOT EXISTS ${CERT_LOCATION})
  				MESSAGE(FATAL_ERROR "Cannot use CERT_LOCATION=${CERT_LOCATION} as it doesn't exist")
  			ENDIF()
  			ADD_FEATURE_INFO(CERT_LOCATION ON "using certificates from ${CERT_LOCATION}")
  			ADD_DEFINITIONS(-DGIT_DEFAULT_CERT_LOCATION="${CERT_LOCATION}")
  		ENDIF()
  
  		SET(GIT_MBEDTLS 1)
  		LIST(APPEND LIBGIT2_SYSTEM_INCLUDES ${MBEDTLS_INCLUDE_DIR})
  		LIST(APPEND LIBGIT2_LIBS ${MBEDTLS_LIBRARIES})
  		# mbedTLS has no pkgconfig file, hence we can't require it
  		# https://github.com/ARMmbed/mbedtls/issues/228
  		# For now, pass its link flags as our own
  		LIST(APPEND LIBGIT2_PC_LIBS ${MBEDTLS_LIBRARIES})
  	ELSEIF (USE_HTTPS STREQUAL "WinHTTP")
  		# WinHTTP setup was handled in the WinHTTP-specific block above
  	ELSE()
  		MESSAGE(FATAL_ERROR "Asked for backend ${USE_HTTPS} but it wasn't found")
  	ENDIF()
  
  	SET(GIT_HTTPS 1)
  	ADD_FEATURE_INFO(HTTPS GIT_HTTPS "using ${USE_HTTPS}")
  ELSE()
  	SET(GIT_HTTPS 0)
  	ADD_FEATURE_INFO(HTTPS NO "")
  ENDIF()
  

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