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windows: change Readlink to handle junction

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Related issue golang/go#10150

Change-Id: I38e3e13238624655bb828d501bc865ff8a4312e9
Reviewed-on: https://go-review.googlesource.com/7493
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Yasuhiro Matsumoto
2015-04-10 22:14:33 +00:00
committed by Alex Brainman
parent d008cdcf32
commit 61f8ff32f5
2 changed files with 33 additions and 11 deletions
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windows/syscall_windows.go
+14 -5
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@@ -962,13 +962,22 @@ func Readlink(path string, buf []byte) (n int, err error) {
}
rdb := (*reparseDataBuffer)(unsafe.Pointer(&rdbbuf[0]))
if uintptr(bytesReturned) < unsafe.Sizeof(*rdb) ||
rdb.ReparseTag != IO_REPARSE_TAG_SYMLINK {
// the path is not a symlink but another type of reparse point
var s string
switch rdb.ReparseTag {
case IO_REPARSE_TAG_SYMLINK:
data := (*symbolicLinkReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer))
p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0]))
s = UTF16ToString(p[data.PrintNameOffset/2 : (data.PrintNameLength-data.PrintNameOffset)/2])
case IO_REPARSE_TAG_MOUNT_POINT:
data := (*mountPointReparseBuffer)(unsafe.Pointer(&rdb.reparseBuffer))
p := (*[0xffff]uint16)(unsafe.Pointer(&data.PathBuffer[0]))
s = UTF16ToString(p[data.PrintNameOffset/2 : (data.PrintNameLength-data.PrintNameOffset)/2])
default:
// the path is not a symlink or junction but another type of reparse
// point
return -1, syscall.ENOENT
}
s := UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(&rdb.PathBuffer[0]))[:rdb.PrintNameLength/2])
n = copy(buf, []byte(s))
return n, nil
}