sbt docker:stage fails on Windows 10

[oporkka]

This is related to #573

Steps to reproduce on Windows 10 machine (I tried using both bash.exe and cmd.exe):

• Check out sbt-native-packager master branch
• Go to test-project-docker folder
• Run sbt docker:stage

You get stack trace

java.lang.ArrayIndexOutOfBoundsException: 1
        at com.typesafe.sbt.packager.docker.DockerPlugin$.com$typesafe$sbt$packager$docker$DockerPlugin$$makeAdd(DockerPlugin.scala:162)
        at com.typesafe.sbt.packager.docker.DockerPlugin$$anonfun$projectSettings$8.apply(DockerPlugin.scala:89)
        at com.typesafe.sbt.packager.docker.DockerPlugin$$anonfun$projectSettings$8.apply(DockerPlugin.scala:80)
        at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
        at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
        at sbt.std.Transform$$anon$4.work(System.scala:63)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
        at sbt.Execute.work(Execute.scala:237)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
        at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
        at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

What seems to have happened is that f521679 (#573, #588) has been reverted by 101311e (#760, #765) in 1.1.1

[muuki88]

Thank for being patient with this windows/docker issue and for the research to fix this regression we introduced.

[morrobkg]

With the latest version (1.1.2), I'm getting this same error on a :stage & :publish.
Docker version: 1.10.0
Docker-machine version: 0.6.0
Windows 7
Scala 2.11.8

Originally had to update the sbt native packager to 1.1.2 for the -f deprecated fix.

[muuki88]

I think we haven't back-ported the fix to 1.1.x yet. Would you mind making a pull request to the 1.1.x branch with these changes: #824

[oporkka]

@muuki88 added #842 for backport