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# Validate md5 hash given md5file url and the file directory.
# This module does the following on hash failure:
# Set HASH_CHECK_FAIL to 1.
# Remove the downloaded files.
macro (check_hash MD5_URL DIR HASH_CHECK_FAIL)
set(HASH_CHECK_FAIL 0)
file(DOWNLOAD ${MD5_URL}
"${DIR}/hash.md5"
STATUS MD5_DOWNLOAD_STATUS_LIST)
list(GET MD5_DOWNLOAD_STATUS_LIST 0 MD5_DOWNLOAD_STATUS)
if (MD5_DOWNLOAD_STATUS EQUAL 0)
file(STRINGS "${DIR}/hash.md5" HASH_DATA NEWLINE_CONSUME)
string(REGEX REPLACE "\n" ";" HASH_LIST "${HASH_DATA}")
foreach(item ${HASH_LIST})
string(SUBSTRING ${item} 0 32 EXPECTED_HASH)
string(SUBSTRING ${item} 34 -1 FILE_NAME)
file(MD5 "${DIR}/${FILE_NAME}" LOCAL_HASH)
if (NOT LOCAL_HASH STREQUAL EXPECTED_HASH)
set(HASH_CHECK_FAIL 1)
file(REMOVE_RECURSE ${DIR})
message(WARNING
"md5sum verification error for ${item}! Got ${LOCAL_HASH}, expected ${EXPECTED_HASH}.")
break()
endif()
endforeach()
else ()
set(HASH_CHECK_FAIL 1)
file(REMOVE_RECURSE ${DIR})
list(GET MD5_DOWNLOAD_STATUS_LIST 1 MD5_DOWNLOAD_ERROR)
message(WARNING
"Could not download the md5 for hash verification! Error code ${MD5_DOWNLOAD_STATUS}: ${MD5_DOWNLOAD_ERROR}!")
endif ()
endmacro (check_hash)
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