Add option for appending timestamps to RPM snapshots

[keirlawson]

To differentiate between multiple different snapshot RPMs it would be great to have a (off by default) flag the would automatically append the timestamp to the RPM version, similar to what the Maven RPM plugin does by default: http://www.mojohaus.org/rpm-maven-plugin/version-mojo.html#release

[muuki88]

Thanks for your feature request.

IMHO this is something we shouldn't add a setting for. We either implement it by default or we provide a simple recipe on how to implement it yourself as this is straightforward to do. sbt-release has some examples on how to set release versions.

[keirlawson]

Ok that sounds reasonable, I guess the argument in favour of doing it by default is it mirrors what the Maven plugin does making it an easier switch, argument against is that its possibly surprising/non-obvious. Certainly as someone coming from Maven having it there by default would help my use case however I don't know how representative my own use case is.

[muuki88]

Cool. Thanks for your understanding 😊
Releasing is not strictly a part of native-packager so I'm always very suspicious if it should be included.

[dpennell]

@keirlawson the rpmRelease setting provides a convenient way to do what you want. See https://docs.fedoraproject.org/ro/Fedora_Draft_Documentation/0.1/html/RPM_Guide/ch01s03.html for background. We've been using a timestamp formatted in sorting order (YYYY.MM.DD.HH.MM.SS.UTC) to achieve maven snapshot-like behavior with yum install/upgrade. We are in the process of moving to using sbt-dynver instead of simple timestamps.