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work around race condition and minimizing download attemps for transparently downloaded potential files

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This commit is contained in:
Axel Kohlmeyer
2020-06-15 13:46:54 -04:00
parent 868e5450db
commit 0199e369fa
1 changed files with 9 additions and 3 deletions
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12
cmake/Modules/LAMMPSUtils.cmake
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@ -96,9 +96,15 @@ function(FetchPotentials pkgfolder potfolder)
math(EXPR plusone "${blank}+1")
string(SUBSTRING ${line} 0 ${blank} pot)
string(SUBSTRING ${line} ${plusone} -1 sum)
message(STATUS "Checking external potential ${pot} from ${LAMMPS_POTENTIALS_URL}")
file(DOWNLOAD "${LAMMPS_POTENTIALS_URL}/${pot}.${sum}" "${LAMMPS_POTENTIALS_DIR}/${pot}"
EXPECTED_HASH MD5=${sum} SHOW_PROGRESS)
if(EXISTS ${LAMMPS_POTENTIALS_DIR}/${pot})
file(MD5 "${LAMMPS_POTENTIALS_DIR}/${pot}" oldsum)
endif()
if(NOT sum STREQUAL oldsum)
message(STATUS "Checking external potential ${pot} from ${LAMMPS_POTENTIALS_URL}")
file(DOWNLOAD "${LAMMPS_POTENTIALS_URL}/${pot}.${sum}" "${CMAKE_BINARY_DIR}/${pot}"
EXPECTED_HASH MD5=${sum} SHOW_PROGRESS)
file(COPY "${CMAKE_BINARY_DIR}/${pot}" DESTINATION ${LAMMPS_POTENTIALS_DIR})
endif()
endforeach()
endif()
endfunction(FetchPotentials)