PR 58062: fix a bug I introduced with the https support: update
the pkgsrc/binary pkgs download URL not only when https transport
is selected.

Add a https transfer method (sharing all host details with the http
transfer). Make this method the default for all downloads.

Try to make sure the binary pkg installation (which runs in a chroot
in the already installed system) can make use of SSL verification.

This does NOT fix the missing SSL verification in most install media
even if using https (due to not fully populated /etc/openssl/certs).

branches: 1.17.2;
When not invoked via some explicit "configure network" menu item,
auto-detect an already working network setup and offer to "just use" it
whenver we need connectivity.

sysinst: Enable mDNS lookups via NSS when enabling mdnsd.

Add/remove "multicast_dns" to the hosts: line in /etc/nsswitch.conf when
toggling the mdnsd rcvar. Change the label from "Enable mdnsd" to "Enable
multicast DNS support" to better describe what's going on here.

Now when you enable multicast DNS support in the installer, the host will
both advertise itself on the network and resolve .local network names.

Make default installations a bit more secure:
- push a bit harder for setup of a root password
- simplify/clarify manual entropy setup
- visit the entropy setup (on machines where it is needed) on the
default path through sysinst

Consistent #if for static helper function add_entropy

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

sysinst: remove trailing whitespace from *.c *.h

In contrast to the messages files, this whitespace is not significant.

Make sure all menus have a translatable exit option (or none at all).

branches: 1.10.2;
For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

branches: 1.5.16;
Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

Add a https transfer method (sharing all host details with the http
transfer). Make this method the default for all downloads.

Try to make sure the binary pkg installation (which runs in a chroot
in the already installed system) can make use of SSL verification.

This does NOT fix the missing SSL verification in most install media
even if using https (due to not fully populated /etc/openssl/certs).

When not invoked via some explicit "configure network" menu item,
auto-detect an already working network setup and offer to "just use" it
whenver we need connectivity.

sysinst: Enable mDNS lookups via NSS when enabling mdnsd.

Add/remove "multicast_dns" to the hosts: line in /etc/nsswitch.conf when
toggling the mdnsd rcvar. Change the label from "Enable mdnsd" to "Enable
multicast DNS support" to better describe what's going on here.

Now when you enable multicast DNS support in the installer, the host will
both advertise itself on the network and resolve .local network names.

Make default installations a bit more secure:
- push a bit harder for setup of a root password
- simplify/clarify manual entropy setup
- visit the entropy setup (on machines where it is needed) on the
default path through sysinst

Consistent #if for static helper function add_entropy

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

sysinst: remove trailing whitespace from *.c *.h

In contrast to the messages files, this whitespace is not significant.

Make sure all menus have a translatable exit option (or none at all).

branches: 1.10.2;
For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

branches: 1.5.16;
Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

When not invoked via some explicit "configure network" menu item,
auto-detect an already working network setup and offer to "just use" it
whenver we need connectivity.

sysinst: Enable mDNS lookups via NSS when enabling mdnsd.

Add/remove "multicast_dns" to the hosts: line in /etc/nsswitch.conf when
toggling the mdnsd rcvar. Change the label from "Enable mdnsd" to "Enable
multicast DNS support" to better describe what's going on here.

Now when you enable multicast DNS support in the installer, the host will
both advertise itself on the network and resolve .local network names.

Make default installations a bit more secure:
- push a bit harder for setup of a root password
- simplify/clarify manual entropy setup
- visit the entropy setup (on machines where it is needed) on the
default path through sysinst

Consistent #if for static helper function add_entropy

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

sysinst: remove trailing whitespace from *.c *.h

In contrast to the messages files, this whitespace is not significant.

Make sure all menus have a translatable exit option (or none at all).

branches: 1.10.2;
For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

branches: 1.5.16;
Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

Make default installations a bit more secure:
- push a bit harder for setup of a root password
- simplify/clarify manual entropy setup
- visit the entropy setup (on machines where it is needed) on the
default path through sysinst

Consistent #if for static helper function add_entropy

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

sysinst: remove trailing whitespace from *.c *.h

In contrast to the messages files, this whitespace is not significant.

Make sure all menus have a translatable exit option (or none at all).

branches: 1.10.2;
For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

branches: 1.5.16;
Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

Consistent #if for static helper function add_entropy

Re-enable the entropy handling code in sysinst (only visible on machines
that do not have full entropy), but move it to the config menu
instead of enforcing it as mandatory step.

This menu is shown at the end of the setup, or if explicitly invoked
from the main menu.

Some of the input options are complex but useful in some situations
and code to support them is tiny. Most users will use the manual input
(first + default option) but some might prefer to connect a USB TRNG
or have easy setups to transfer entropy from another machine (while
copy & paste on a serial console sometimes is tricky).

sysinst: remove trailing whitespace from *.c *.h

In contrast to the messages files, this whitespace is not significant.

Make sure all menus have a translatable exit option (or none at all).

branches: 1.10.2;
For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

branches: 1.5.16;
Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

sysinst: remove trailing whitespace from *.c *.h

In contrast to the messages files, this whitespace is not significant.

Make sure all menus have a translatable exit option (or none at all).

branches: 1.10.2;
For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

branches: 1.5.16;
Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.

Make sure all menus have a translatable exit option (or none at all).

For upgrade / re-install allow the currently running system as a target
in the "disk" selection.

no need to initialize fields that are already 0.

use proper format strings in replace().

Use _fmt_ msg_ methods when formats are needed.

Rework internal data structures and "interfaces to user interface" functions
to get rid of all disklabel assumptions.

Previously (even for GPT partitioning) struct disklabel was used, which
obviously breaks large disk setups. Also many MD parts and parts of the
user interface assumed (a) a struct disklabel is used internally to
store partitioning information and (b) partitions are named 'a' ... $MAXPART.

Get rid of this and replace it with a quite abstract interface that should
be able to deal with all variants in partition storage:

- partitions are stored in a (partly abstract) struct disk_partitions
and most parts of it are only accessed via accessor functions provided
by a "partitioning scheme".

- implement partitioning schemes for MBR, disklabel and GPT (with likely
RDB [amiga] and Apple Partition Map [mac*] to follow soon)

- partitioning schemes may be cascaded, e.g. on x86 when using MBR as
"outer partitions", we have disklabel as "inner partitions".

- all user interface goes via accessor functions in the partitioning scheme,
some of which return pointers to special user interface descriptors
(e.g. to allow editing partition flags, which are scheme specific)

Overall the user interface changes (in this initial step) are minimal but
noticable. A new Anita is needed for automatic test setups - many thanks
to Andreas Gustafsson for lots of early testing and a new Anita version,
and to Manuel Bouyer for cooperation and tests of the Anita release.

This work was sponsored by The NetBSD Foundation, Inc.

Make "ask_yesno" and "ask_noyes" take a const char * as argument, moving
the deconst() dance into the utility functions and simplifying all callers.

Backout the previous incorrect fix for PR 49440 and redo it more globaly:
get rid of the global "yesno", introduce utility functions "ask_yesno()"
and "ask_noyes()" instead, greatly simplifying a lot of code.
Pass in a pointer to the return value to various "set source" menus.

Handle empty input gracefully by simply jumping back to the config menu.

branches: 1.2.2; 1.2.4; 1.2.6;
(Finally) merge a slightly modified version of the 2012 GSoC results
from Eugene Lozovoy: add extended partitioning options to sysinst.
Still needs some testing and polishing, but it now is possible to use GPT
or to create a RAID set from scratch and install onto it.

Move sysinst sources to usr.sbin.

This commit only physically moves the sources - there are no other
changes, to maximize the probability that this will be treated as a
rename if we ever do manage to migrate away from CVS.

Moving sysinst has been discussed on and off for years and has two
goals: making it easier to work on sysinst, and also making sysinst
available on running systems for use installing chroots and VM images
and other such things. None of the latter is possible yet, but as they
say, one thing at a time.

Doing this now was approved in an impromptu fashion by mrg, riz,
riastradh, me, and groo.