[exec] Cannot use quoted spaces in commands

[cpiber]

Expected Behavior

The command gets executed as if entered into the command line.

Current Behavior

The command is passed to Runtime.getRuntime().exec as string parameter, causing it to get parsed by Java's Tokenizer, which ignores quotes and always splits at spaces.
This means that an argument with spaces surrounded by quotes still gets split into two (or more).

Possible Solution

Line 174 of ExecHandler.java (https://github.com/openhab/openhab-addons/blob/2.5.x/bundles/org.openhab.binding.exec/src/main/java/org/openhab/binding/exec/internal/handler/ExecHandler.java#L174):
Change from proc = rt.exec(commandLine.toString()); to proc = rt.exec(new String[] {"bash", "-c", commandLine.toString() });.
Possibly include a check whether on *nix systems or on Windows (change 'bash' to 'cmd' and '-c' to '/c' on MS Windows).

Steps to Reproduce (for Bugs)

Set command to include an argument with spaces, for example: wget --post-data "some data" http://example.com

Your Environment

openHABian 4.19.75-v7l+ #1270 SMP Tue Sep 24 18:51:41 BST 2019 armv7l

[cpiber]

Alternative: use the same system as ExecUtil (https://github.com/openhab/openhab-core/blob/b03b3e9b0026c0915a7370eb17e8f80405bfa497/bundles/org.openhab.core.io.net/src/main/java/org/openhab/core/io/net/exec/ExecUtil.java#L58) which provides a way to replace spaces between arguments with @@