Add the ability to read and modify file/directory permissions to dart:io

[nex3]

Currently Dart provides no access to filesystem permissions at all. It should do so.

[nex3]

Marked this as blocking #8101.

[andersjohnsen]

There is access to file-system permission in:

  FileStat.stat(path).then((stat) {
    print(stat.mode.toRadixString(8)); // Permission is mapped as octets
    print(stat.modeString());
  });

There are no way to set these, as of now.

[andersjohnsen]

Issue #1834 has been merged into this issue.

---

cc @sgjesse.
cc @madsager.

[kevmoo]

Removed Area-IO label.
Added Library-IO, Area-Library labels.

[DartBot]

This comment was originally written by @seaneagan

---

We also need to be able to access the current process uid and gid and FileStat uid and gid to compare them to each other to determine the process' permissions to that file/directory. Is that part of this bug, or is a separate one needed? I think it may even be possible to support it in windows, see:

baudehlo/node-fs-ext#27

[DartBot]

This comment was originally written by @seaneagan

---

File permission related bugs: issue #22036, issue #22037

[sgjesse]

Removed Type-Defect label.
Added Type-Enhancement label.