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os: make Stat work on FAT file system

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It appears calling GetFileInformationByHandleEx with
FILE_ATTRIBUTE_TAG_INFO fails on FAT file system. FAT does not
support symlinks, so assume there are no symlnks when
GetFileInformationByHandleEx returns ERROR_INVALID_PARAMETER.

Fixes #29214

Change-Id: If2d9f3288bd99637681ab5fd4e4581c77b578a69
Reviewed-on: https://go-review.googlesource.com/c/154377
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Alex Brainman 2018-12-15 18:52:26 +11:00
parent bc175e53cc
commit e4535772ca
1 changed files with 9 additions and 1 deletions
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10
src/os/types_windows.go
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@ -51,7 +51,15 @@ func newFileStatFromGetFileInformationByHandle(path string, h syscall.Handle) (f
var ti windows.FILE_ATTRIBUTE_TAG_INFO
err = windows.GetFileInformationByHandleEx(h, windows.FileAttributeTagInfo, (*byte)(unsafe.Pointer(&ti)), uint32(unsafe.Sizeof(ti)))
if err != nil {
return nil, &PathError{"GetFileInformationByHandleEx", path, err}
if errno, ok := err.(syscall.Errno); ok && errno == windows.ERROR_INVALID_PARAMETER {
// It appears calling GetFileInformationByHandleEx with
// FILE_ATTRIBUTE_TAG_INFO fails on FAT file system with
// ERROR_INVALID_PARAMETER. Clear ti.ReparseTag in that
// instance to indicate no symlinks are possible.
ti.ReparseTag = 0
} else {
return nil, &PathError{"GetFileInformationByHandleEx", path, err}
}
}
return &fileStat{