From IEEE Std 1003.1-2017:
3.437 User Name:
A string that is used to identify a user; see also User Database. To be
portable across systems conforming to POSIX.1-2017, the value is composed
of characters from the portable filename character set. The <hyphen-minus>
character should not be used as the first character of a portable user name.
3.282 Portable Filename Character Set
The set of characters from which portable filenames are constructed.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9 . _ -
The last three characters are the <period>, <underscore>, and <hyphen-minus>
characters, respectively.
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The regex checking the username in org.osbuild.users stage omitted the
<period> character before. This commit adds it and modifies the stage
test in order to cover this change.
Fixes: rhbz#2104464
092f886904