pw userdel: destroy home dataset if empty

When removing a user's home directory, if the directory is a ZFS
dataset, it cannot be removed. If the directory has been emptied,
use "zfs destroy" to destroy it. This complements the automatic
dataset creation in adduser. Note that datasets within the directory
and snapshots are not handled, as the complete path is not constructed.

While here, add waitpid() calls to rmat() and pw_user_del().

Reviewed by: des
Differential Revision: https://reviews.freebsd.org/D45348

Purge more stray embedded $FreeBSD$ strings

These do not use __FBSDID but instead use bare char arrays.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41957

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

pw: Fix a resource leak.

Reported by: Coverity
MFC after: 1 week
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.

pw: do not removed home directories if not owned

When deleting a user, if its home directory does not belong to it, it should
not be removed. This is the promise that the manpage makes, the tool should
ensure that it respects that promise.

Add a regression test about it

PR: 244967
Submitted by: Eric Hanneken <eric@erichanneken.com>
MFC after: 3 days

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

Do not try to delete the home of the user if is is not a directory for example
"/dev/null"

PR: 211195
Submitted by: rday <ryan@ryanday.net>
Reported by: eniorm <eniorm@gmail.com>
MFC after: 1 day

Cleanup includes

pw -R <rootdir> userdel can now cleanup installation

Rewrite rm_r to use *at function, allowing to remove home directories along with
users. only crontabs and at(1) installation are not removed

Relnotes: yes

Avoid overflowing the file buffer

Submitted by: db
Approved by: cperciva
MFC after: 2 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Include missing header files which define functions for which gcc has
builtints (e.g., exit, strcmp).

$Id$ -> $FreeBSD$

Use err(3) instead of local redefinition. Add rcsid string.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Copyright update by the author, to be more in line with our sample
copyright.

Submitted by: David Nugent

pw(8) -- a backend utility to manage the user and group databases.

sysinstall's new User&group menu will use it, hence it's a 2.2
candidate despite of providing new functionality.

Submitted by: David L. Nugent, <davidn@blaze.net.au>