docs/reference/mpremote: Update docs for mpremote rm -r.

Signed-off-by: Jos Verlinde <Jos_Verlinde@hotmail.com>

docs/reference/mpremote.rst

@@ -229,7 +229,7 @@ The full list of supported commands are:
   - ``ls`` to list the current directory
   - ``ls <dirs...>`` to list the given directories
   - ``cp [-rf] <src...> <dest>`` to copy files
-  - ``rm <src...>`` to remove files on the device
+  - ``rm [-r] <src...>`` to remove files or folders on the device
   - ``mkdir <dirs...>`` to create directories on the device
   - ``rmdir <dirs...>`` to remove directories on the device
   - ``touch <file..>`` to create the files (if they don't already exist)
@@ -238,15 +238,35 @@ The full list of supported commands are:
   The ``cp`` command uses a convention where a leading ``:`` represents a remote
   path. Without a leading ``:`` means a local path. This is based on the
   convention used by the `Secure Copy Protocol (scp) client
-  <https://en.wikipedia.org/wiki/Secure_copy_protocol>`_. All other commands
-  implicitly assume the path is a remote path, but the ``:`` can be optionally
-  used for clarity.
+  <https://en.wikipedia.org/wiki/Secure_copy_protocol>`_.
 
   So for example, ``mpremote fs cp main.py :main.py`` copies ``main.py`` from
   the current local directory to the remote filesystem, whereas
   ``mpremote fs cp :main.py main.py`` copies ``main.py`` from the device back
   to the current directory.
 
+  The ``mpremote rm -r`` command accepts both relative and absolute paths.
+  Use ``:`` to refer to the current remote working directory (cwd) to allow a
+  directory tree to be removed from the device's default path (eg ``/flash``, ``/``).
+  Use ``-v/--verbose`` to see the files being removed.
+
+  For example:
+
+  - ``mpremote rm -r :libs`` will remove the ``libs`` directory and all its
+    child items from the device.
+  - ``mpremote rm -rv :/sd`` will remove all files from a mounted SDCard and result
+    in a non-blocking warning. The mount will be retained.
+  - ``mpremote rm -rv :/`` will remove all files on the device, including any
+    located in mounted vfs such as ``/sd`` or ``/flash``. After removing all folders
+    and files, this will  also return an error to mimic unix ``rm -rf /`` behaviour.
+
+  .. warning::
+    There is no supported way to undelete files removed by ``mpremote rm -r :``.
+    Please use with caution.
+
+  All other commands implicitly assume the path is a remote path, but the ``:``
+  can be optionally used for clarity.
+
   All of the filesystem sub-commands take multiple path arguments, so if there
   is another command in the sequence, you must use ``+`` to terminate the
   arguments, e.g.

tools/mpremote/tests/README.md

@@ -4,11 +4,26 @@ This directory contains a set of tests for `mpremote`.
 
 Requirements:
 - A device running MicroPython connected to a serial port on the host.
+- The device you are testing against must be flashed with a firmware of the same build
+  as `mpremote`.
+- If the device has an SDcard or other vfs mounted, the vfs's filesystem must be empty
+  to pass the filesystem test.
 - Python 3.x, `bash` and various Unix tools such as `find`, `mktemp`, `sed`, `sort`, `tr`.
+- To test on Windows, you can either:
+    - Run the (Linux) tests in WSL2 against a USB device that is passed though to WSL2.
+    - Use the `Git Bash` terminal to run the tests against a device connected to a COM
+      port. _Note:_ While the tests will run in `Git Bash`, several will throw false
+      positive errors due to differences in the way that TMP files are logged and and
+      several other details.
 
 To run the tests do:
 
+    $ cd tools/mpremote/tests
     $ ./run-mpremote-tests.sh
 
+To run a single test do:
+
+    $ ./run-mpremote-tests.sh test_filesystem.sh
+
 Each test should print "OK" if it passed.  Otherwise it will print "CRASH", or "FAIL"
 and a diff of the expected and actual test output.