vm: 'qemu-command' honors its argument.

* gnu/build/vm.scm (qemu-command): Refer to SYSTEM rather than
%HOST-TYPE in the body.

container: Gracefully report mount errors in the child process.

Fixes <http://bugs.gnu.org/23306>.

* gnu/build/linux-container.scm (run-container): Use 'socketpair'
instead of 'pipe'.  Rename 'in' to 'child' and 'out' to 'parent'.  Send
a 'ready message or an exception argument list from the child to the
parent; adjust the parent accordingly.
* tests/containers.scm ("call-with-container, mnt namespace, wrong bind
mount"): New test.
* tests/guix-environment-container.sh: Add test with
--expose=/does-not-exist.

container: Gracefully handle failure to set up user namespaces.

* gnu/build/linux-container.scm (run-container): Exit when the parent
process doesn't say 'ready.

Merge branch 'master' into gnome-updates

Add (gnu tests) and (gnu build marionette).

* gnu/build/marionette.scm, gnu/tests.scm: New files.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add them.
* gnu/system/vm.scm (common-qemu-options): Remove '-serial stdio'.

file-systems: Add 'find-partition-by-luks-uuid'.

* gnu/build/file-systems.scm (%luks-endianness, %luks-header-size): New
macros.
(%luks-magic): New variable.
(sub-bytevector, read-luks-header, luks-header-uuid): New procedures.
(partition-predicate): Add 'read' parameter; wrap it with 'ENOENT-safe'.
Use it instead of 'read-ext2-superblock*'.
(read-ext2-superblock*): Remove.
(partition-label-predicate, partition-uuid-predicate): Pass
'read-ext2-superblock' as the first argument.
(partition-luks-uuid-predicate): New variable.
(find-partition-by-luks-uuid): New procedure.

file-systems: Separate ENOENT catching from ext2 superblock reads.

* gnu/build/file-systems.scm (ENOENT-safe): New procedure.
(read-ext2-superblock*): Rewrite in terms of it.

activation: Copy account skeletons silently.

* gnu/build/activation.scm (copy-account-skeletons): Pass #:log to
'copy-recursively'.

system: Allow account skeletons to be directories.

* gnu/system/shadow.scm (skeleton-directory): Use 'copy-recursively'
instead of 'copy-file'.
* gnu/build/activation.scm (copy-account-skeletons): Likewise.

Merge branch 'master' into security-updates

build: reset-timestamps: Include directories.

* guix/build/install.scm (reset-timestamps): Reset timestamps of
  directories as well.

vm: Only pass "-enable-kvm" to qemu if /dev/kvm is present.

Fixes <http://bugs.gnu.org/22633>.

* gnu/build/vm.scm (load-in-linux-vm): Only pass "-enable-kvm" flag to qemu
  if "/dev/kvm" is present.
* gnu/system/vm.scm (common-kvm-options): Same as above.

linux-modules: Use normalized module names for 'modprobe.blacklist'.

* gnu/build/linux-modules.scm (normalize-module-name): New procedure.
(file-name->module-name): Use it.
(module-black-list): Expound docstring.

file-systems: Spawn a Bournish REPL upon fsck failure.

Fixes <http://bugs.gnu.org/22588>.
Reported by Mark H Weaver <mhw@netris.org>.

* gnu/build/file-systems.scm (check-file-system): Pass
%BOURNISH-LANGUAGE as the argument to 'start-repl'.
* gnu/services.scm (activation-script): Add (guix build bournish).
* gnu/services/base.scm (file-system-shepherd-service)[imported-modules]:
Likewise.
* gnu/system/linux-container.scm (container-script): Likewise.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Likewise.

Rename 'dmd' to 'shepherd' in comments and strings.

* build-aux/hydra/demo-os.scm (operating-system)[issue]: Point to
  shepherd instead of dmd.
* ROADMAP: Likewise.
* gnu/build/install.scm (directives): Adjust comment.

Rename '/root/etc/dmd' directory and 'do-not-kill' file.

* gnu/services/base.scm (%do-not-kill-file): Rename to
  "/etc/shepherd/do-not-kill".
* gnu/build/linux-boot.scm (mount-root-file-system): Rename
  "/root/etc/dmd" to "/root/etc/shepherd".

Merge branch 'master' into core-updates

build: container: Make 'unprivileged-user-namespace-supported?' more robust.

* gnu/build/linux-container.scm (unprivileged-user-namespace-supported?): Only
  read and check the first character, to cope with a possible newline in the
  (pseudo-)file.

Merge branch 'master' into core-updates

linux-modules: Support 'modprobe.blacklist' on the command line.

* gnu/build/linux-modules.scm (file-name->module-name)
(module-black-list): New procedure.
* gnu/build/linux-modules.scm (load-linux-module*): Add #:black-list
parameter.
[black-listed?, load-dependencies]: New procedures.
Use them.