credential-cache: handle ECONNREFUSED gracefully #5329
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hickford
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To distinguish the two identical error messages "unable to connect to cache daemon", consider changing the second to “unable to connect to spawned cache daemon”
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We map WSAGetLastError() errors to errno errors in winsock_error_to_errno(), but the MSVC strerror() implementation only produces "Unknown error" for most of them. Produce some more meaningful error messages in these cases. Our builds for ARM64 link against the newer UCRT strerror() that does know these errors, so we won't change the strerror() used there. The wording of the messages is copied from glibc strerror() messages. Reported-by: M Hickford <[email protected]> Signed-off-by: Matthias Aßhauer <[email protected]>
The part about keeping the original error number hasn't been accurate since commit c11f75c (mingw: make sure errno is set correctly when socket operations fail, 2019-11-25) and the part about strerror() not knowing about these errors is untrue since the previous commit. Signed-off-by: Matthias Aßhauer <[email protected]>
In 245670c (credential-cache: check for windows specific errors, 2021-09-14) we concluded that on Windows we would always encounter ENETDOWN where we would expect ECONNREFUSED on POSIX systems, when connecting to unix sockets. As reported in [1], we do encounter ECONNREFUSED on Windows if the socket file doesn't exist, but the containing directory does and ENETDOWN if neither exists. We should handle this case like we do on non-windows systems. [1] git-for-windows#4762 (comment) This fixes git-for-windows#5314 Helped-by: M Hickford <[email protected]> Signed-off-by: Matthias Aßhauer <[email protected]>
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I should probably add some tests for this.