path/filepath: keep the trailing separator on GLOBALROOT device paths volumeNameLen treats the component after a device prefix as the volume name, which is what keeps Clean from removing the trailing separator of a volume root. GLOBALROOT is not a volume: it links to the root of the NT object namespace, and the volume is named by the two components after it, so Clean stripped the separator from paths like \\?\GLOBALROOT\Device\HarddiskVolume1\. That separator decides what the path refers to: with it the volume's root directory, without it the raw device. Windows hands these paths out, notably from the Shadow Copy API. Consume the two components after GLOBALROOT, as a UNC host and share already are. Object namespace paths can nest deeper; those are still not handled. Fixes #67880 Change-Id: I9780595eadbc8efc77d396edc20908d2c5d48e7d Reviewed-on: https://go-review.googlesource.com/c/go/+/819060 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Quim Muntal <quimmuntal@gmail.com> Reviewed-by: Cherry Mui <cherryyz@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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