Add Debian script header

[dax]

Without the shell header, Debian package installation fails with Exec format error

[lightbend-cla-validator]

Hi @dax,

Thank you for your contribution! We really value the time you've taken to put this together.

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[muuki88]

Thanks :) For some of the scripts the header will be redundant, but that's okay has #!/bin/sh will be treated as a comment otherwise, right? On which system did you get the error and test the fix?

[dax]

I got the error on a Debian squeeze.

[kardapoltsev]

May be we should add something like postrm_header and put #!/bin/sh into it? Less code duplication and nobody will forget to add this to any new template.

[muuki88]

This would be even better

[dax]

Ok, I will do it.

[kardapoltsev]

@dax would you reimplement your PR? If not then I will fix. And thanks for your effort anyway!

[dax]

I have updated my PR. Tell me if this is what you expected.

[kardapoltsev]

LGTM except one small note.

val userGroupAdd = headerScript ++ Seq(
  TemplateWriter.generateScript(DebianPlugin.postinstGroupaddTemplateSource, replacements),
  TemplateWriter.generateScript(DebianPlugin.postinstUseraddTemplateSource, replacements))

May be it'll be better to handle postinst similar to other scripts like

prependAndFixPerms(postinst, headerScript, LinuxFileMetaData())

[lightbend-cla-validator]

Hi @dax,

Thank you for your contribution! We really value the time you've taken to put this together.

Before we proceed with reviewing this pull request, please sign the Typesafe Contributors License Agreement:

http://typesafe.com/contribute/cla

[dax]

Ok, I fixed it.

[muuki88]

LGTM. Works for Ubuntu 13.04. @kardapoltsev did you test it, too? If so, you can merge this.

[kardapoltsev]

@dax, thanks!

[kardapoltsev]

And I've added tests for scripts header