Here's a fun little thing we commited to systemd the other day: the concept of .v/ directories. What do we mean by that? Many of systemd's commands that take big resource files that are often versioned (e.g. a disk image file you could pass to sysemd-nspawn's --image= switch) now learnt a magic trick if you pass a path whose last component has the suffix ".v" and is a directory. If so, the tool will iterate through the dir's contents, do a version sort and automatically pick the newest version.
