Windows Git Bash fix

[mikehenry-io]

Maybe something as simple as this might work satisfactorily for solving #96?

I.e. we assume Windows only if OS is Windows (of course) and there is no *n?x style shell.

[scottkurz]

Thanks Mike, I'm not an expert but trying them all quick, that code does seem to solve the problem of detecting whether we're in cygwin, Git Bash vs. Windows cmd or Powershell.

There's still the "migration" concern though. I'm not sure we could introduce this mid-stream without making you opt-in via some new configuration.

I will try to gather some more input on this question.

[mikehenry-io]

Sounds great, Scott! How to opt-in when running in Maven? By introducing a new build parameter in the plugin?

[scottkurz]

I think we're OK with the idea of switching to this as a new default behavior. Not seeing a real down side still, and if we're wrong we can fix it later and tell users to avoid the version(s) in question if they need to.

Let me just look over the rest of the isWindows logic in AbstractTask.java that I mentioned in #96.

Thanks again for the PR.

[scottkurz]

Unfortunately this fix doesn't seem like it's going to be enough, since the /bin/server script doesn't seem to be executable to the ProcessBuilder API we're using to launch the server.

Trying this results in Git Bash & Cygwin gives:

[ERROR] Failed to execute goal net.wasdev.wlp.maven.plugins:liberty-maven-plugin:2.8-SNAPSHOT:run (default-cli) on project batch-bonuspayout-application: java.io.IOException: Cannot run program "C:\git\sample.batch.bonuspayout\target\liberty\wlp/bin/server" (in directory "C:\git\sample.batch.bonuspayout\target\liberty\wlp"): CreateProcess error=193, %1 is not a valid Win32 application -> [Help 1]

You can see the code we use to build the ProcessBuilder command in ServerTask.java here:

        if (isWindows) {
            binDirectory = installDir + "\\bin\\";
            embeddedServerJar = binDirectory + "tools\\ws-server.jar";
            wlp = "\"" + binDirectory + "server.bat" + "\"";
            processBuilder.environment().put("EXIT_ALL", "1");
        } else {
            binDirectory = installDir + "/bin/";
            embeddedServerJar = binDirectory + "tools/ws-server.jar";
            wlp = binDirectory + "server";
        }

which we later launch with:

        processBuilder.command(command);
        Process p = processBuilder.start()

Having noticed this, I didn't bother trying to confirm the isWindows path I mentioned in #96 (for handing I/O from the child process) still functions as expected.

[scottkurz]

So having made that comment, what about the idea of saving the value of System.getenv("SHELL") and building a ProcessBuilder command using this shell to launch ".../bin/server, etc." ?

[mikehenry-io]

I see now that stashing $SHELL might not be enough since ProcessBuilder needs an actual (Windows-) executable to run; e.g. "%EXEPATH%\git-bash.exe -c .../bin/server ...".
I don't have Cygwin installed, but it seems like it is started with "%EXEPATH%\bash.exe" and in that case it is worth trying to stat one or the other and see if it can be launched.