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ExternalData: Improve robustness on Windows to copy a data object to a file

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When an external data object was recently created on disk, perhaps
fetched by the current process or another process, it may be
inaccessible on Windows for a short time.  Tell our `file(COPY_FILE)`
call to retry a few times to copy the object to the final file path.

Hopefully this will resolve our long-standing spurious failures of the
`Module.ExternalData` test on Windows.
This commit is contained in:
Brad King 2022-11-17 13:49:25 -05:00
parent efa9eec040
commit d34986036f
1 changed files with 1 additions and 1 deletions
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2
Modules/ExternalData.cmake
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@ -945,7 +945,7 @@ function(_ExternalData_link_or_copy src dst)
file(CREATE_LINK "${tgt}" "${tmp}" RESULT result COPY_ON_ERROR SYMBOLIC)
else()
# Create a copy.
file(COPY_FILE "${src}" "${tmp}" RESULT result)
file(COPY_FILE "${src}" "${tmp}" RESULT result INPUT_MAY_BE_RECENT)
endif()
if(result)
file(REMOVE "${tmp}")