5300362172
Currently windows Stat uses combination of Lstat and Readlink to walk symlinks until it reaches file or directory. Windows Readlink is implemented via Windows DeviceIoControl(FSCTL_GET_REPARSE_POINT, ...) call, but that call does not work on network shares or inside of Docker container (see issues #18555 ad #19922 for details). But Raymond Chen suggests different approach: https://blogs.msdn.microsoft.com/oldnewthing/20100212-00/?p=14963/ - he suggests to use Windows I/O manager to dereferences the symbolic link. This appears to work for all normal symlinks, but also for network shares and inside of Docker container. This CL implements described procedure. I also had to adjust TestStatSymlinkLoop, because the test is expecting Stat to return syscall.ELOOP for symlink with a loop. But new Stat returns Windows error of ERROR_CANT_RESOLVE_FILENAME = 1921 instead. I could map ERROR_CANT_RESOLVE_FILENAME into syscall.ELOOP, but I suspect the former is broader than later. And ERROR_CANT_RESOLVE_FILENAME message text of "The name of the file cannot be resolved by the system." sounds fine to me. Fixes #10935 Fixes #18555 Fixes #19922 Change-Id: I979636064cdbdb9c7c840cf8ae73fe2c24499879 Reviewed-on: https://go-review.googlesource.com/41834 Reviewed-by: Harshavardhana <hrshvardhana@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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