Rudder

The techniques Package management for RHEL/CentOS/SuSE/RPM systems and Package management for Debian / Ubuntu / APT systems don't let user select specific version.
This prevents some case to be handled :
- on systems with differents version of a package installed, but not the one we want (for instance, package installed in version 1.2.3 and 1.2.5, and the one we want is 1.2.4)
- on system with not previous known state for a package (might be installed or not), we can't simply say : install on version 1.2.4 : install checks that the package is installed (but don't update); update updates it (but don't install it)

Having a repository with only the right version of the package won't work, as it wouldn't update from 1.2.5 to 1.2.4