src/usr.sbin/tzsetup, branch releng/10.3

Revert the merge of r289269 for now as it may break non-root installs.

2015-10-27T01:28:11+00:00

MFC r289269:

2015-10-27T00:37:19+00:00

Use chroot(2) instead of using prefixes for files.

Previously, the code prefixes the chroot path to actual file paths to
simulate the effect.  This, however, will not work for tzset(3) which
expects the current system have a working set of timezone data files,
and that is not always the case.

This changeset simplifies the handling of paths and use an actual
chroot(2) call to implement the effect.

PR:		bin/197313

MFC r261296:

2014-03-01T03:09:16+00:00

Merge from CheriBSD:
commit c1acf022c533c5ae27e0cd556977eafe3f5959eb
Author: Brooks Davis 
Date:   Fri Jan 17 21:46:44 2014 +0000

	Add an option WITHOUT_NCURSESW to suppress building and linking to
	libncursesw.  While wide character support it useful we'd like to
	only need one ncurses library on embedded systems.

Sponsored by:	DARPA, AFRL

Fix VERBOSE reporting on results when removing _PATH_LOCALTIME for UTC option.

2013-03-04T11:34:31+00:00

PR:		bin/164976
Submitted by:	dteske

Grammar: tzsetup now has more than one option.

2012-02-29T14:44:42+00:00

It's not an error if unlink(2) fails because the pathname doesn't exist.

2012-02-08T05:03:04+00:00

Noticed by: kevlo
Pointy hat to: wollman

Clean up reinstall option and remove duplicate code

2012-01-25T02:15:40+00:00

- Move the reinstall logic to be before menus are initialised
  (menus are not needed when reinstalling a zonefile).

- Remove unnecessary re-initialization of path_db.

- Update variable name and error message because we now use the
  zone name relative to /usr/share/zoneinfo, not the full path.

pr:		bin/164041
Submitted by:	Devin Teske 
MFC after:	1 week

Fix #ifdef VERBOSE for UTC case

2012-01-18T04:37:35+00:00

Update verbose output to match what actually happens when selecting
the UTC option, and when the -n option is used.

Patch updated slightly for new libdialog.

PR:		bin/164042
Submitted by:	Devin Teske 
MFC after:	2 weeks

Don't write /var/db/zoneinfo when zone is not actually changed.

2012-01-18T04:12:32+00:00

If the specified zone file does not exist or the -n flag is specified,
do not update /var/db/zoneinfo.

PR:		bin/164039
Submitted by:	Devin Teske 
MFC after:	1 week

Use a reasonable-sized buffer when formatting error messages about

2012-01-12T05:50:32+00:00

installing zoneinfo.  While we're in the vicinity, add some missing
error checking to eliminate an unhelpful error message when unlink()
fails.

/me is embarrassed by the quality of his 16-year-old code.
The whole thing is awful and could stand a complete rewrite.

PR:		164038
Submitted by:	Devin Teske (but implemented differently)