download.cmake

download.cmake

if(NOT(DEST))
    message(FATAL_ERROR "DEST NOT DEFINED")
endif()

if(SHA1)
    string(TOLOWER ${SHA1} SHA1)
endif()

if(EXISTS "${DEST}")
    if(NOT(SHA1))
        message(STATUS "File ${DEST} Exist. SHA1 Hash not checked.")
        return()
    else()
        file(SHA1 "${DEST}" SHA1_RESULT)
        string(TOLOWER ${SHA1_RESULT} SHA1_RESULT)

        if("${SHA1}" STREQUAL "${SHA1_RESULT}")
            message(STATUS "File ${DEST} Exist. SHA1 Hash match.")
            return()
        else()
            message(FATAL_ERROR "File ${DEST} Exist but SHA1 Hash mismatch(${SHA1} != ${SHA1_RESULT})")
        endif()
    endif()
    message(FATAL_ERROR "UNREACHABLE")
endif()

if(NOT(URL))
    message(FATAL_ERROR "URL NOT DEFINED")
endif()

function(mktemp)
    set(TEMP ENV{shell} PARENT_SCOPE)
    if(NOT(TMPDIR))
        if(CMAKE_HOST_UNIX)
            execute_process(COMMAND mktemp -d OUTPUT_VARIABLE TEMP)
            string(STRIP "${TEMP}" TEMP)
            set(TEMP "${TEMP}" PARENT_SCOPE)
        else()
            message(FATAL_ERROR "Temp Dir not found")
        endif()
    endif()
endfunction()

if(NOT(TEMP))
    mktemp(TEMP)
else()
    file(MAKE_DIRECTORY "${TEMP}")
endif()

get_filename_component(DEST_FILENAME "${DEST}" NAME)
get_filename_component(DEST_DIRECTORY "${DEST}" DIRECTORY)

message(STATUS "URL: ${URL}")
message(STATUS "DEST_DIRECTORY: ${DEST_DIRECTORY}")
message(STATUS "TEMP DEST: ${TEMP}/${DEST_FILENAME}")

if(SHA1)
    file(DOWNLOAD "${URL}" "${TEMP}/${DEST_FILENAME}" EXPECTED_HASH ALGO=${SHA1})
else()
    file(DOWNLOAD "${URL}" "${TEMP}/${DEST_FILENAME}")
endif()

file(MAKE_DIRECTORY "${DEST_DIRECTORY}")
file(COPY "${TEMP}/${DEST_FILENAME}" DESTINATION "${DEST_DIRECTORY}")