- minor improvements

Another feature suggested by Michael Radyuk (torabora):
some images are known alpha/beta quality, it's more handy
to just state this at the build time than to rename by hand.

This trots along the TODO item on text branding
and hopefully helps Michael Radyuk (torabora)
with his feature request to tweak the installer's
"Install ALT Linux" label; as an example, Simply
will now offer to "Install Simply Linux".

The package actually passed the test and just got uploaded
to Sisyphus proper; its aim is to help set up the cross-arch
QEMU build environment.

NB: there are known issues with PPC32-on-x86_64 (which were
the cause for this package and commit to be created in the
first place).

Some images were unbuildable (at least without special setup,
like ve/centos), unusable or just not useful in any meaningful way
(like distro/live-isomd5sum); as these tend to get any attention
during experiments, I decided to put them together in a separate
configuration file that would be effectively skipped if DEBUG
is not requested.

This one was suggested by enp@ for industrial use where
some extra protection for the boot process might be quite
desirable.

If no syslinux ui was specified (the stock configuration paths
ensure there is one) or if it was set to "none" explicitly,
then there's no boot: prompt (let alone any menu).

If there's a need to ensure that the boot process is not
interruptable by Ctrl/Shift/Caps Lock/Scroll Lock.

This provides the means to cross-build at least ARM chroots,
there are known problems with PowerPC for me so far:
http://lists.altlinux.org/pipermail/devel/2012-July/194855.html

See also http://www.altlinux.org/Ports/arm/chroot for /proc magic.

- a bunch of fixups and cleanups

The prerequisites for a cleanup after a successful build
were somewhat weird at this point; now the rules are:
- if DEBUG level is more than 1 or CHECK is set, don't do it;
- otherwise if at least one of the following conditions is true:
  + there's more than one target being built in a row;
  + the build was run by e.g. alterator-mkimage;
  + metaprofile directory is read only
  ...then do a distclean.

If these are still weird or feel unsuitable for profile hacking,
drop me a note (or a patch).

Essentially all the relevant server images got cpufreq setup
and a power button handler; feel free to ask for revert if
this causes any harm in any situation.

It wasn't obvious at all what BRANDING variable is for
(at least until the source code and existing configurarion
has been examined).

`help' used to be the default target described at the very top
of the toplevel makefile but that got broken with g2f307fff;
spotted while discussing m-p with enp@.

Also pulled the pkglist/kmodule part out of distro/server-mini's
recipe and started off a standalone feature based on it.

NB: el-smp kernel now contains aufs as a module but propagator
doesn't try to modprobe it.

"textinst" != "textinstall", so let's just stick to the latter form.

Actually the templates pretending to be usable missed the whole
interactivesystem (sysvinit would get pulled in by services as well).

Fixed somewhat but time and practice will tell.

TDE distros don't really need kdm4 which was proposed as
a replacement by zerg@ (for all the valid reasons but kdm3
wasn't maintained at that point, this has changed since).

The reason is that package lists and individual packages
are processed in different dependency resolution "transactions"
by mkimage; thus if packages (the more precise form of specifying
the contents) come first they can't override the lists appearing
later, and that's wrong: we should be able to specify the more
generic things and then pinpoint the specifics.

This became apparent while authoring [[Mkimage/Profiles/m-p/howto]]
asked for by drool@.

The problem was spotted by Alexander Bandura:
bin/tar2vm wasn't present in the generated profile.

I considered extending features.in/Makefile to include
bin/ alongside lib/ but that would make the helper's location
unpredictable (unless BUILDDIR is specified explicitly) so
restricting sudoers would be harder; worse yet, the copied file
would come with write access for the user building an image.

The implications in restricted case are complex enough anyways
so the recommended implementation would only include a fixed
readonly location like /usr/share/mkimage-profiles/bin/tar2vm
as laid out in doc/vm.txt, and that means it's in the metaprofile
not a generated profile.

Argh, is it overdocumentation already?
The temporary name bites once again...

say() redirects to stderr already.

No need to just go ahead and source files in potentially
unavailable directories, really.

- ppc builds

As it happens, adding another architecture required almost no changes;
native 32-bit ppc build took only ARCH and a repo, qemu-ppc one still
has problems (/.host/entry hangs while unpacking setup for fakedata).

Proof of concept on a QS22:

  $ make ve/bare.tar.gz
  ** ARCH: ppc
  /bin/sh: rpmvercmp: command not found
  21:41:01 cleaning up
  21:41:03 initializing BUILDDIR: build/
  21:41:03 preparing distro config
  21:41:05 starting image build (coffee time)
  21:42:48 done (1:42)
  ** image: $TMP/out/bare-20120716-ppc.tar.gz [21M]

"df -l" is going to hurt (or at least spam) if it's a diskless node;
"df -P" helps maintain output parseability.  So be it.

su wasn't making it into the image breaking ~/.git setup,
and there's no reason for a full default boot timeout either.

There was some extra duplication, just clean it up.

mkimage and hasher can make use of qemu to run
non-native binaries while working on the chroots;
thanks kas@, manowar@ and sbolshakov@ for implementing
this functionality as well as providing nice examples
through mkimage-profiles-arm and mkimage-profile-armrootfs.

This required the architecture check to be added since baking
a tarball with "arm" as its specified arch and x86_64 inside
isn't particularly good thing to let slip through; however
the implementation is quite fragile, bugreports and patches
are seriously welcome.

NB: APTCONF evaluation order between lazy make and nimble shell
turned out to be quite a delicate issue in this particular case.

- arm builds

The only thing to be fixed was setarch(8) symlinks assumption
that is correct for x86 but not for ARM.

There's also some hasher(7) setup to be done:

  mkdir -p ~/.hasher
  echo >> ~/.hasher/config <<-EOF
  def_target=arm
  #cache_dir=$HOME/tmp	# depends on RAM/storage configuration
  EOF

...and of course apt(8) should be properly set up too.

An example PoC build on a CM-A510 board (tmpfs):

  $ make BRANDING=altlinux-centaurus ve/bare.tar.gz
  ** ARCH: arm
  18:10:45 initializing BUILDDIR: build/
  18:10:45 preparing distro config: build/distcfg.mk
  18:10:46 starting image build: tail -f build/build.log
  18:14:49 done (4:02)
  ** image: $TMP/out/bare-20120706-arm.tar.gz [23M]

~/.mkimage/profiles.mk is useful but not requisite by any margin;
no need to make noise trying to make it either.

Whoops, an overlooked character didn't bring too many
things down but was a BUG indeed :-/

- simply fixes

It's not DHCP we're configuring but rather eth0.
(no need for trailing space either)

The very basic bitmap fonts that were left in back a year ago
aren't particularly modern (even if they are somewhat elegant
and resource sparing which was the goal at that time).

So let's allow for something slightly prettier,
like Croscore Arimo kindly prepared by Steve Matteson,
provided by Google, packaged by Fedora and imported by
Igor Vlasenko.

Here's the news item behind this commit:
http://lwn.net/Articles/502371/

As they say there's nothing more permanent
than a temporary... params.txt and pkglists.txt
were known as vars-build.txt and vars-conf.mk
in the midst of reworking, and part of that
tried to stick.