thodg/libgit2/cmake/SelectHTTPSBackend.cmake

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• Hash : 0903cac1
  Author :
  Date : 2021-08-11T01:30:38
  

  openssl: dynamically load libssl and symbols (optionally) Provide an interface around OpenSSL to dynamically load the libraries and symbols, so that users can distribute a libgit2 library that is not linked directly against OpenSSL. This enables users to target multiple distributions with a single binary. This mechanism is optional and disabled by default. Configure cmake with -DUSE_HTTPS=OpenSSL-Dynamic to use it.

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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
  	ELSEIF (USE_HTTPS STREQUAL "OpenSSL-Dynamic")
  		SET(GIT_OPENSSL 1)
  		SET(GIT_OPENSSL_DYNAMIC 1)
  		LIST(APPEND LIBGIT2_LIBS dl)
  	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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