guix system: Check for the lack of modules in the initrd.

* guix/scripts/system.scm (check-mapped-devices): Take an OS instead of
a list of <mapped-device>.  Pass #:needed-for-boot? and #:initrd-modules
to CHECK.
(check-initrd-modules): New procedure.
(perform-action): Move 'check-mapped-devices' call first.  Add call to
'check-initrd-modules'.
* gnu/system/mapped-devices.scm (check-device-initrd-modules): New
procedure.
(check-luks-device): Add #:initrd-modules and #:needed-for-boot?.  Use
them to call 'check-device-initrd-modules'.

system: Add 'initrd-modules' field.

* gnu/system.scm (<operating-system>)[initrd-modules]: New field.
(operating-system-initrd-file): Pass #:linux-modules to 'make-initrd'.
* gnu/system/linux-initrd.scm (default-initrd-modules): New procedure.
(%base-initrd-modules): New macro.
(base-initrd): Add #:linux-modules and honor it.
* gnu/system/install.scm (embedded-installation-os): Use
'initrd-modules' instead of 'initrd'.
* gnu/tests/install.scm (%raid-root-os): Likewise.
* doc/guix.texi (operating-system Reference): Add 'initrd-modules'.
(Initial RAM Disk): Document it.  Adjust example to not use
 #:extra-modules.

linux-initrd: Separate file system module logic.

* gnu/system/linux-initrd.scm (vhash, lookup-procedure): New macros.
(file-system-type-modules, file-system-modules): New procedures.
(base-initrd)[cifs-modules, virtio-9p-modules]: Remove.
[file-system-type-predicate]: Remove.
Use 'file-system-modules' instead of 'find' +
'file-system-type-predicate'.

Merge branch 'master' into core-updates

services: agetty: Add agetty instance to base services. Make its tty optional.

* gnu/services/base.scm (%base-services): Instantiate agetty-service.
(default-serial-port): New variable.
(agetty-shepherd-service): Make tty optional, default to the above.
* doc/guix.texi (agetty-configuration): Update "tty" documentation.
* gnu/system/install.scm (agetty-default-service): Delete variable.
(embedded-installation-os): Remove agetty-default-service instance.
Add "console" kernel-argument.

Merge branch 'master' into core-updates

gnu: linux-libre: NVME core support is now built-in.

* gnu/system/linux-initrd.scm (base-initrd)[linux-modules]: Remove "nvme".
* gnu/packages/aux-files/linux-libre/4.1-i686.conf,
gnu/packages/aux-files/linux-libre/4.1-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.4-i686.conf,
gnu/packages/aux-files/linux-libre/4.4-x86_64.conf: Set CONFIG_BLK_DEV_NVME=y.
* gnu/packages/aux-files/linux-libre/4.9-i686.conf,
gnu/packages/aux-files/linux-libre/4.9-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.14-arm.conf,
gnu/packages/aux-files/linux-libre/4.14-i686.conf,
gnu/packages/aux-files/linux-libre/4.14-x86_64.conf: Set CONFIG_BLK_DEV_NVME=y
and CONFIG_NVME_CORE=y.

system: Put locales where libc will find them.

* gnu/system/locale.scm (localedef-command, single-locale-directory): Use only
the major+minor part of the libc version number in the locale directory name.

Merge branch 'master' into core-updates

system: Rename a20-olinuxino-lime-sd-installation-os.

* gnu/system/install.scm (a20-olinuxino-lime-sd-installation-os): Rename to...
(a20-olinuxino-lime-installation-os): ...this.

system: Add A20 OLinuXino LIME installer.

* gnu/bootloader/u-boot.scm (u-boot-a20-olinuxino-lime-bootloader):
New exported variable.
* gnu/packages/bootloaders.scm (u-boot-a20-olinuxino-lime):
New exported variable.
* gnu/system/install.scm (a20-olinuxino-lime-installation-os):
New exported variable.

doc: No longer mention Wicd in OS examples.

* gnu/system/examples/desktop.tmpl,
gnu/system/examples/lightweight-desktop.tmpl: Mention NetworkManager
instead of Wicd.

system: Add Nintendo NES Classic Edition installer.

* gnu/bootloader/u-boot.scm (u-boot-nintendo-nes-classic-edition-bootloader):
New exported variable.
* gnu/packages/bootloaders.scm (u-boot-nintendo-nes-classic-edition):
New exported variable.
* gnu/system/install.scm (nintendo-nes-classic-edition-installation-os):
New exported variable.

system: Factor out embedded-installation-os.

* gnu/system/install.scm (embedded-installation-os): New variable.
(beaglebone-black-installation-os): Use it.
(a20-olinuxino-lime2-emmc-installation-os): Use it.
(a20-olinuxino-micro-installation-os): Use it.
(banana-pi-m2-ultra-installation-os): Use it.

system: Factor out agetty-default-service.

* gnu/system/install.scm (agetty-default-service): New variable.
(beaglebone-black-installation-os): Use it.
(a20-olinuxino-lime2-emmc-installation-os): Use it.
(a20-olinuxino-micro-installation-os): Use it.
(banana-pi-m2-ultra-installation-os): Use it.

system: Add A20 OLinuXino MICRO installer.

* gnu/bootloader/u-boot.scm (u-boot-a20-olinuxino-micro-bootloader): New
exported variable.
* gnu/packages/bootloaders.scm (u-boot-a20-olinuxino-micro): New exported
variable.
* gnu/system/install.scm (a20-olinuxino-micro-installation-os): New exported
variable.

system: Add A20 OLinuXino LIME2 installer.

* gnu/bootloader/u-boot.scm (u-boot-a20-olinuxino-lime2-bootloader): New
exported variable.
* gnu/packages/bootloaders.scm (u-boot-a20-olinuxino-lime2): New exported
variable.
* gnu/system/install.scm (a20-olinuxino-lime2-emmc-installation-os): New exported
variable.

system: Add Banana Pi M2 Ultra installer.

* gnu/bootloader/u-boot.scm (u-boot-banana-pi-m2-ultra-bootloader): New
exported variable.
(install-allwinner-u-boot): New variable.
(u-boot-allwinner-bootloader): New variable.
* gnu/packages/bootloaders.scm (u-boot-banana-pi-m2-ultra): New exported
variable.
* gnu/system/install.scm (banana-pi-m2-ultra-installation-os): New exported
variable.

Merge branch 'master' into core-updates

gnu: Consistently Write ‘file system(s)’.

It is the GNU way.

* doc/guix.texi (Build Systems, DNS Services): Write ‘file system(s)’.
* gnu/build/vm.scm (create-ext-file-system, create-fat-file-system):
Likewise.
* gnu/packages/backup.scm (dirvish, rsnapshot)[description]: Likewise.
* gnu/packages/check.scm (python-testpath)[description]: Likewise.
* gnu/packages/disk.scm (pydf)[description]: Likewise.
* gnu/packages/file-systems.scm (disorderfs)[synopsis, description]: Likewise.
(glusterfs)[description]: Likewise.
* gnu/packages/haskell.scm (ghc-directory, ghc-system-fileio-bootstrap)
(ghc-system-fileio)[synopsis]: Likewise.
(ghc-fsnotify)[description]: Likewise.
* gnu/packages/linux.scm (proot)[description]: Likewise.
(jmtpfs)[synopsis, description]: Likewise.
* gnu/packages/mate.scm (caja, caja-extensions)[description]: Likewise.
* gnu/packages/storage.scm (ceph)[description]: Likewise.
* gnu/packages/sync.scm (lsyncd)[description]: Likewise.
* gnu/packages/syncthing.scm (syncthing)[synopsis]: Likewise.
(go-github-com-zillode-notify)[description]: Likewise.
* gnu/services/nfs.scm (pipefs-service-type): Likewise.
* guix/scripts/system.scm (perform-action): Likewise.