Added Template Directories for Debian package #54

[muuki88]

Template directories can now be created via

debianMakeTemplateDirectories in Debian += packageTemplateMapping(
    "/var/log/" + name.value,
    "/etc/" + name.value
)

Sorry for some changes, the IDE formatting kicked in :/

[jsuereth]

Hmm... I think we may want to do a few things here:

1. Remove this hack: https://github.com/muuki88/sbt-native-packager/blob/468c926fc3ce83a8b43c5dabcbafa52725a23f8e/src/main/scala/com/typesafe/sbt/packager/debian/DebianPlugin.scala#L146
2. Instead of creating a new mechanism for empty directories, why not just throw those in LinuxPackageMappings? If we fix the kludge above, they should show up when copying, and you could also have those same empty directories for RPMs. We can alter the defaults to discover empty directories in src/debian or src/linux and pull them in as templates. Maybe a flag to turn the autodiscovery off too.
3. Add a mechanism to chown files (as you reported elsewhere). This isn't needed for RPMs (where you can write ownership to the spec file), but may be needed for debian. The issue is, using the virtual root, I'm not sure how to get all the ownership information correct. You don't want to just do a chown because the UIDs won't match up when installed, right?

What do you think of that plan?

[muuki88]

1. Yep. This is surely a good plan. Have to get my head arround this one :)
2. I tried, but failed with my first attempt. When i specify a packageMapping like this

packageMapping(
    file("/var/log") -> "/var/log"
)

I didn't worked out. Or should it?
3. I think this is a bit tricky. Maybe I'll take a look at similar plugins and take a look at their strategy. However the UIDs will be a problem. Maybe we should use this instead of the username?

[jsuereth]

Closed in favor of alternative mechanism in #63