Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC: r240336:
Simply things so that "#REQUIRE: FILESYSTEMS" means the file
systems are fully "ready to go".

'FILESYSTEMS' states: "This is a dummy dependency, for services which
require file systems to be mounted before starting." However, we have
'var' which is was run after 'FILESYSTEMS' and can mount /var if it
already isn't mounted. Furthermore, several scripts cannot use /var
until 'cleanvar' has done its thing. Thus "FILESYSTEMS" hasn't really
meant all critical file systems are fully usable.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Use resolvconf(8) to create /etc/resolv.conf, not directly overwrite it.

Approved by: re (kib)

As previously discussed, add the svn:executable property to all scripts

Add an empty stop_cmd to the remaining scripts that don't start
daemons and don't already have one.

Add REQUIRE netif to make ordering more deterministic, and to make sure
we have a fighting chance of having useful stuff from DHCP.

Tighten up the code a little, and fix whitespace issues.

Remove rcconf.sh from /etc/rc.d, and instead load the configuration
as part of rc. Doing this, and the sourcing of rc.subr after we have
determined if we are booting diskless (and correspondingly run
rc.initdiskless if necessary) are safe, and actually allow fewer files
to be needed on the diskless box. This also allows variables from
the configuration to be available to rc itself, such as ...

Add a variable to rc.conf, early_late_divider, which designates the
script which separates the early and late stages of the boot process.
Default this to mountcritlocal, and add text to etc/defaults/rc.conf,
rc.conf(5) and diskless(8) which describes how and why one might want
to change this.

Reviewed by: brooks

It is sufficent to require rcconf rather than initdiskless.

Remove the requirement for the FreeBSD keyword as it no longer
makes any sense.

Discussed with: dougb, brooks
MFC after: 3 days

Replace shell's positional parameters safely.

Overhaul the /etc/rc.d/diskless script by splitting it out into
hostname, resolve, tmp, and var scripts. The latter three are new and
were repo copied. These scripts no longer depend on being booted with
and NFS root instead attempt to automaticly create mfs /tmp and /var
volumes if the they are not writable. This behavior can be overridden
in /etc/rc.conf.

Reviewed by: luigi, pjd

Mark scripts as not usable inside a jail by adding keyword 'nojail'.

Some suggestions from: rwatson, Ruben de Groot <mail25@bzerk.org>

Don't run newaliases if sendmail_enable=NONE.

Submitted by: Matt Peterson <matt at peterson dot org>
Approved by: silence on freebsd-rc

Update references to rc.diskless[12]

Fix typo.

Spotted by: "Bjoern A. Zeeb" <bzeeb@zabbadoz.net>

More checking if kenv actually know something.

Guard against test(1)-unfriendly outputs from kenv.

In case we have no /etc/resolv.conf, don't try to make it out of
thin blue air if the kenv doesn't have any info.

This improves the truth value of the comment above significantly and
reduces the bogous output on the console considerably.

kenv moved from /usr/bin/ to /bin/.

Do not unconditionally load the configuration files for the RCNG case.
Instead, load them as part of the rc.d system. This allows us to prioritize
the initidiskless script so it runs before the configuration files are loaded
and allows us to get rid of the exit 2 hack in /etc/rc. The exit 2 never
worked anyway since it did not unset the prior configuration, causing the
diskless code to not operate properly.

Do a major cleanup and revamping of the diskless code for RCNG. This will
be backported to the non-RCNG scripts as well as -stable.

With suggestions from: Mike Makonnen <mtm@identd.net>
MFC after: 7 days

Fix style bugs:
* Space -> tabs conversion.
* Removed blanks before semicolon in "if ... ; then".
* Proper indentation of misindented lines.
* Put a full stop after some comments.
* Removed whitespace at end of line.

Approved by: silence from gordon

test -h is deprecated; use -L instead.

PR: bin/40846

Use mdmfs(8) rather than rolling our own RAM-disks.

Sponsored by: DARPA & NAI Labs.

Apply same fix as Rev 1.19 of /etc/rc.diskless2: create sendmail
required directories if sendmail_enable is not set to "none".

Suggested by: gordon

Merge in all the changes that Mike Makonnen has been maintaining for a
while. This is only the script pieces, the glue for the build comes next.

Submitted by: Mike Makonnen <makonnen@pacbell.net>
Reviewed by: silence on -current and -hackers
Prodded by: rwatson

fix backwards spelling

The usage of 'newaliases' needs to be after we know for sure that /usr
is mounted.

Submitted by: rizzo

The existing bazaar and site-specific policy in rc.diskless1 is Just Wrong;
and looks like no other Unix diskless configuration I've ever seen.
Thus allow a more traditional /etc.

Note, the use of an MFS /var should also be settable.
Otherwise installing ports(packages) is just a total PITA.

o Add a comment indicating that if /tmp==/var/tmp in rc.diskless2, the
md device and file system creation occurs *after* mtree is run, and
as such an /var/tmp/* or /tmp/* entries will be under the mountpoint
(or fail) rather than appearing in the md filesystems. This prevents
the creation of vi.recover, and might affect other localizations that
rely on the mtree calls affecting these directories.

Remeber to set the permissions on an md-backed /tmp to 01777, rather than
using the default of 0755.

Ensure that /var/log/lastlog exists so that login doesn't complain.

Submitted by: Harti Brandt <brandt@fokus.gmd.de>
MFC after: 2 weeks

Remove vestiges of MFS.

* Simplify the population of the /etc memory filesystem. To avoid
the null mount, we currently create a temporary mfs on /tmp, copy
/etc to /tmp, then mount /etc as mfs and copy everything back from
/tmp, then delete the /tmp mfs.

The patch eliminates the temporary /tmp mfs and the subsequent
copying and simply populates the /etc mfs by copying from
/conf/default/etc. This requires that /conf/default/etc contain a
complete copy of all the /etc stuff instead of just overrides. I
don't think that is too much of an extra step in setting up a
diskless environment.

* Provide the ability to make /tmp a memory filesystem independent
of /var. This removes the requirement that /tmp be a symlink to
/var/tmp and this makes the diskless code work with the default
filesystem layout. If a seperate /tmp memory filesystem is
created, the 'tmpsize' environment variable is used to determine
its size (default to 10 Meg).

* Reduce diffs between the -current and -stable versions of these
files to a bare minimum. Only the definition of the shell
function 'mount_md' is different.

Not Objected to by: -arch@, -small@

MFC after: 2 days

Don't mount a md(4) over /dev on DEVFS enabled diskless systems.

Move to using md.
o create a simple wrapper function mount_md that makes it easy to
move from mount_mfs.

# NOTE: you will need to MAKEDEV md[0123] in order for this to work.

Reviewed by: bsd, keichii

MFS: the MFS still applies to -current until such time as someone fixes
rc.diskless2 to use mdconfig rather than mount_mfs. These changes are
still relevant to -current.

Add copyright notices. Other systems have been barrowing our /etc files
w/o giving any credit.

Add to defaults/rc.conf a new function source_rc_confs which rc
scripts may use to source safely overrides in ${rc_conf_files}
files.

This protects users who insist on the bad practice of copying
/etc/defaults/rc.conf to /etc/rc.conf from a recursive loop
that exhausts available file descriptors.

Several people have expressed interest in breaking this function
out into its own shell script. Anyone who wants to embark on
such an undertaking would do well to study the attributed PR.

PR: 17595
Reported by: adrian
Submitted by: Doug Barton <Doug@gorean.org>

Cleanup diskless support in current, mostly aligning it to the one
in the 3.x branch. Also remove the dependency on /usr to find the
boot address/interface.
Mostly-submitted-abd-tested-by: MIHIRA Sanpei Yoshiro <sanpei@sanpei.org>

Add/adjust some $FreeBSD$ tags.

Noted by: Doug <Doug@gorean.org>

Apply a consistent style to most of the etc scripts. Particularly, use
case instead of test where appropriate, since case allows case is a sh
builtin and (as a side-effect) allows case-insensitivity.

Changes discussed on freebsd-hackers.

Submitted by: Doug Barton <Doug@gorean.org>

Use /etc/defaults/rc.conf everywhere, falling back to /etc/rc.conf
as necessary (for half-assed upgrades).

Revamp rc.diskless. Split into rc.diskless1 and rc.diskless2. provide
more opportunities for overriding. Clean up /etc/rc ( remove conf_dir,
remove startup mount special cases, remove other special cases )