dovecot - Jan 2016 - [Bug/Enhancement] doveadm user ignores -f option when performing a wildcard search

The title mostly says it all on this one, but it seems that doveadm user has
unique behaviour when a wildcard username is given, causing it to return a list
of matching usernames in place of regular output, ignoring other command line
options such as the -f (field) option.

For example, I had hoped to use the following command in a script to easily get
a list of all user home locations (excluding local users):

doveadm user -f home *@*

However the results are a list of usernames, rather than a list of home
locations as I had hoped.

I?ve tagged this thread as Bug/Enhancement as outputting a list of matched
usernames is clearly the intended behaviour, but it could certainly be
clarified, as could the fact that the -f option is ignored in this special case.

I think that the correct ?fix? here is to clarify in the documentation that
wildcard matching is a separate use-case of this command in which the -f (and
possibly other?) options are ignored and the results are always given as a list
of matching usernames. It needs to be clear that doveadm user user at
domain1.tld user at domain2.tld and doveadm user *@* are not equivalent, even if
those are the only two users, as this differs from many other unix commands
where wildcards are permitted, e.g- using rm with a wildcard is equivalent to
adding all matching files to the command yourself.

However, in future I?d like to see support for the -f option with wildcard
matches as well, with -f user simply being the default. This would be much
easier for a script inspecting user home directories, as for now my alternative
is to use the wildcard match to get a list of names, then call dovecot user -f
home <user> for each one to get their home location, which isn?t nearly as
nice =)

- Haravikk