49 lines
1.6 KiB
CMake
49 lines
1.6 KiB
CMake
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# Helper to download files as needed
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function(file_md5_if_exists FILE VAR)
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if(EXISTS "${FILE}")
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file(MD5 "${FILE}" "${VAR}")
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set(${VAR} "${${VAR}}" PARENT_SCOPE)
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else()
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set(${VAR} "" PARENT_SCOPE)
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endif()
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endfunction()
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function(download_file URL DEST EXPECTED_MD5)
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get_filename_component(FILENAME "${URL}" NAME)
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file_md5_if_exists("${DEST}" CUR_MD5)
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if(NOT "${EXPECTED_MD5}" STREQUAL "${CUR_MD5}")
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message("* Downloading ${FILENAME}")
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file(DOWNLOAD "${URL}" "${DEST}" EXPECTED_MD5 "${EXPECTED_MD5}" SHOW_PROGRESS)
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endif()
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endfunction()
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# Download a file and uncompress it
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function(download_file_unzip URL ZIP_TYPE ZIP_DEST ZIP_MD5 UNZIP_DEST UNZIP_MD5)
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get_filename_component(FILENAME "${URL}" NAME)
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file_md5_if_exists("${UNZIP_DEST}" CUR_UNZIP_MD5)
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# Redownload if the MD5 of the uncompressed file doesn't match
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if(NOT "${UNZIP_MD5}" STREQUAL "${CUR_UNZIP_MD5}")
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download_file("${URL}" "${ZIP_DEST}" "${ZIP_MD5}")
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if(EXISTS "${ZIP_DEST}")
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message("* Decompressing ${FILENAME}")
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if("${ZIP_TYPE}" STREQUAL "gz")
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execute_process(COMMAND gunzip --force "${ZIP_DEST}")
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else()
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message(SEND_ERROR "Unknown ZIP_TYPE: ${ZIP_TYPE}")
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endif()
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if(NOT EXISTS "${UNZIP_DEST}")
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message(SEND_ERROR "File failed to unzip to ${UNZIP_DEST}")
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else()
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file(MD5 "${UNZIP_DEST}" CUR_UNZIP_MD5)
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if(NOT "${UNZIP_MD5}" STREQUAL "${CUR_UNZIP_MD5}")
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message(SEND_ERROR "MD5 mismatch: ${UNZIP_DEST}: expected ${UNZIP_MD5}, got ${CUR_UNZIP_MD5}")
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endif()
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endif()
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endif()
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endif()
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endfunction()
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