Fix divergent overwrite behavior of FileManager.copyItem(at:to:) on Linux and Windows #4808
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gwynne
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Aug 7, 2023
gwynne
added a commit
to vapor/api-docs
that referenced
this pull request
Aug 7, 2023
* Add some icons * Pretty up generate-package-api-docs.swift a bit * Work around swiftlang/swift-corelibs-foundation#4808
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@swift-ci please test |
parkera
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Aug 9, 2023
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@swift-ci please test macOS platform |
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On Apple platforms, the
FileManagerAPIscopyItem(atPath:toPath:)andcopyItem(at:to:)refuse to overwrite the destination file (or link, or directory) if it already exists; this behavior is even explicitly documented. And indeed, any such attempt results in afileWriteFileExistserror.However, on Linux and Windows, the destination is silently overwritten. This PR changes that behavior to match what's documented. On POSIX platforms, this is accomplished by adding the
O_EXCLflag to the relevantopen(2)call, which results in anEEXISTerrno if the path already exists. For Windows, thebFailIfExistsparameter ofCopyFileW()is changed totrue.Fixes #3368