tree f2904430b0cb86f7b7a2721ae2ddd60fcf727166
parent e1fa787be8d0d66c9860c86dcb80fd6e096f74e0
author Rob Landley <rob@landley.net> 1411775384 -0500
committer Rob Landley <rob@landley.net> 1411775384 -0500

The only illegal characters in a username are ":" (field separator), "\n" (line separator), and "/" (filename separator).

Restricting usernames to the legacy posix character allowed set (for filenames,
so the $HOME directory is creatable on VFAT and similar) means you can't have
UTF-8 usernames. Linux allows any character but / and NUL in filenames.
Since root is creating these entries, we assume root knows what it's doing.