linux-boot: Don't catch exceptions thrown by 'mount-root-file-system'.

* gnu/build/linux-boot.scm (mount-root-file-system): Remove 'catch #t'
  around body.  This was unneeded and even inconvenient because this
  procedure is called from within 'call-with-error-handling' already.

file-systems: Always write the options field in /etc/mtab.

* gnu/build/file-systems.scm (mount-file-system): When OPTIONS is false,
  write "rw" to /etc/mtab.  This fixes a bug whereby 'remove-from-mtab'
  in (guix syscalls) would otherwise raise a 'match-error' because of
  the missing field.  This affected file systems mounted from the
  initrd, such as devtmpfs, which has options == #f.

vm: Set the boot flag on the root partition.

Reported by nebuli on #guix.

* gnu/build/vm.scm (initialize-partition-table): Add #:bootable?
  parameter and honor it.
  (initialize-hard-disk): Likewise.

linux-boot: Make more disk partition block devices.

Reported by nebuli on #guix.

* gnu/build/linux-boot.scm (make-disk-device-nodes): Make 16 block
  devices for disk partitions.

activation: Set the firmware search path.

* gnu/build/activation.scm (activate-firmware): New procedure.
* gnu/system.scm (<operating-system>)[firmware]: New field.
  (directory-union): New procedure.
  (%base-firmware): New variable.
  (operating-system-activation-script): Use 'directory-union', and call
  'activate-firmware'.
* doc/guix.texi (operating-system Reference): Document 'firmware'.

system: Allow Linux-libre to find our 'modprobe' command.

Fixes <http://bugs.gnu.org/18525>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/build/activation.scm (activate-modprobe): New procedure.
* gnu/system.scm (modprobe-wrapper): New procedure.
  (operating-system-activation-script): Use both.

system: Add support for boot-time mapped devices.

* gnu/build/linux-boot.scm (boot-system): Add #:pre-mount parameter and
  honor it.
* gnu/system/linux-initrd.scm (base-initrd): Add #:mapped-devices
  parameter.  Add 'device-mapping-commands' variable, and use it to
  build the #:pre-mount argument of 'boot-system'.
* gnu/system.scm (mapped-device-user,
  operating-system-user-mapped-devices,
  operating-system-boot-mapped-devices): New procedures.
  (device-mapping-services): Use 'operating-system-user-mapped-devices'
  instead of 'operating-system-mapped-devices'.
  (operating-system-initrd-file): Call the initrd with #:mapped-devices.

activation: Ensure existing user accounts have the right settings.

* gnu/build/activation.scm (modify-user, ensure-user): New procedures.
  (activate-users+groups): Systematically call 'ensure-user'.

linux-boot: Ask fsck for a progress bar.

* gnu/build/file-systems.scm (check-file-system): Pass '-C 0' to FSCK.
  Suggested by Mark H. Weaver.

linux-initrd: Remove now obsolete #:guile-modules-in-chroot? parameter.

* gnu/build/linux-boot.scm (boot-system): Remove
  #:guile-modules-in-chroot? and related code.
* gnu/system/linux-initrd.scm (base-initrd): Likewise.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Remove
  #:guile-modules-in-chroot? argument in 'base-initrd' call.

Merge branch 'master' into core-updates

Conflicts:
	gnu-system.am

activation: Honor $GUIX_NEW_SYSTEM for use by 'guix system reconfigure'.

* gnu/build/activation.scm (activate-current-system): Honor
  $GUIX_NEW_SYSTEM by default.
* guix/scripts/system.scm (switch-to-system): Set $GUIX_NEW_SYSTEM
  before loading SCRIPT.

Merge branch 'master' into core-updates

Conflicts:
	gnu/packages/image.scm

activation: Set the permissions of /etc/sudoers to 440.

* gnu/build/activation.scm (activate-etc): Move 'rm-f' to a local
  'define'.  When TARGET is "sudoers", make it 440.

activation: Make the /bin/sh symlink at activation time.

* gnu/build/install.scm (directives): Remove "/bin/sh".
* gnu/build/activation.scm (activate-/bin/sh): New procedure.
* gnu/system.scm (operating-system-activation-script): Use it.

activation: Make sure /etc/sudoers & co. are regular files.

Before that, 'sudo' would exit with:

  sudo: /etc/sudoers is not a regular file
  sudo: no valid sudoers sources found, quitting

* gnu/build/activation.scm (activate-etc): Check if SOURCE matches
  'file-is-directory?'.  If not, use 'copy-file' instead of 'symlink'.

activation: Remove outdated comment.

* gnu/build/activation.scm (activate-etc): Remove outdated comment.

activation: Factorize the link-or-copy trick.

* gnu/build/activation.scm (link-or-copy): New procedure.
  (activate-setuid-programs): Use it.

install: Gracefully handle corner cases with 'guix system init foo /'.

* gnu/build/install.scm (evaluate-populate-directive): Wrap body in
  "catch 'system-error", and report clear errors.  In the symlink case,
  retry up EEXIST.
  (populate-root-file-system): Remove /var/guix/profiles/system-1-link
  before attempting to create it.

linux-initrd: Store Linux modules in a normal store directory.

* gnu/system/linux-initrd.scm (expression->initrd): Remove #:linux and
  #:linux-modules parameters.  Remove call to
  'float-linux-module-directory'.
  (base-initrd): Add call to 'float-linux-module-directory'.  Use it in
  #:linux-modules argument in the gexp.  Remove #:linux and
  #:linux-modules arguments to 'expression->initrd'.
* gnu/build/linux-initrd.scm (build-initrd): Remove
  #:linux-module-directory parameter.  Don't create 'modules'
  sub-directory.
* gnu/build/linux-boot.scm (boot-system): Mentin that LINUX-MODULES is a
  list of absolute file names.  Don't prepend "/modules/" to
  LINUX-MODULES.
* doc/guix.texi (Initial RAM Disk): Adjust accordingly.