This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
include-what-you-use automatically does this and it makes finding
unnecessary harder to spot. The only content of poll.h is a include
of sys/poll.h so should be harmless.
Programs such as OpenVPN may use ask-password for not only retrieving
passwords, but also usernames. Masking usernames with * seems just silly.
v2 - Don't mess with termios flags, instead print the input
instead of an asterix. Resolves issues with backspace
and TAB input.
v3 - Renamed 'do_echo' variables and argument to 'echo'. Also
modified the ask_password_{tty,agent,auto} API instead of
additional wrapper functions.
[zj: undo changes to ask_password_auto, since no callers were using
the new argument.]
getopt is usually good at printing out a nice error message when
commandline options are invalid. It distinguishes between an unknown
option and a known option with a missing arg. It is better to let it
do its job and not use opterr=0 unless we actually want to suppress
messages. So remove opterr=0 in the few places where it wasn't really
useful.
When an error in options is encountered, we should not print a lengthy
help() and overwhelm the user, when we know precisely what is wrong
with the commandline. In addition, since help() prints to stdout, it
should not be used except when requested with -h or --help.
Also, simplify things here and there.
Add an (optional) "Id" key in the password agent .ask files. The Id is
supposed to be a simple string in "<subsystem>:<target>" form which
is used to provide more information on what the requested passphrase
is to be used for (which e.g. allows an agent to only react to cryptsetup
requests).
(v2: rebased, fixed indentation, escape name, use strappenda)
Internally we store all time values in usec_t, however parse_usec()
actually was used mostly to parse values in seconds (unless explicit
units were specified to define a different unit). Hence, be clear about
this and name the function about what we pass into it, not what we get
out of it.
