This reverts commit 3b09332adf, which
turned out to be a bad idea because we need to have dependency
information between the device-mapping service and the file-system
service that uses it.
* gnu/system/file-systems.scm (<mapped-device>)[needed-for-boot?]: New
field.
* gnu/system.scm (operating-system-user-mapped-devices,
operating-system-boot-mapped-devices): Use it instead of trying to
guess. Guessing doesn't work when one refers to a partition using its
label, for instance.
* doc/guix.texi (Mapped Devices): Document 'needed-for-boot?'.
* gnu/system/linux-initrd.scm (flat-linux-module-directory)[build-exp]:
Add 'lookup' procedure. Use 'recursive-module-dependencies' to
compute the list of modules to copy.
Adjust #:modules parameter.
* gnu/system/locale.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system.scm (<operating-system>)[locale]: Change the default to
"en_US.utf8".
(operating-system-locale-directory): New procecure.
(operating-system-derivation): Use it.
* doc/guix.texi (Using the Configuration System): Change example locale
to "fr_FR.utf8".
(operating-system Reference): Add xref to "Locales". Document
'locale-definitions'.
(Locales): New section.
* po/guix/POTFILES.in: Add gnu/system.scm.
Reported by Nikita Karetnikov.
* gnu/system/file-systems.scm (<file-system>): Rename 'needed-for-boot?'
accessor to '%file-system-needed-for-boot?'.
(file-system-needed-for-boot?): New inlinable procedure.
* gnu/system.scm (other-file-system-services)[file-systems]: Rely on
'file-system-needed-for-boot?' to handle the "/" case.
(operating-system-initrd-file)[boot-file-systems]: Likewise.
* gnu/system/vm.scm (<file-system-mapping>): New record type.
(%store-mapping): New variable.
(host-9p-file-system): Rename to...
(mapping->file-system): ... this. Replace 'source' and 'target'
parameters with 'mapping'. Set 'flags' field.
(virtualized-operating-system): Add 'mappings' parameter and honor
it.
(system-qemu-image/shared-store-script): Add 'mappings' parameter.
Pass it to 'virtualized-operating-system'. Use it in argument to
'common-qemu-options'.
* gnu/system/vm.scm (file-system->mount-tag, host-9p-file-system): New
procedures.
(virtualized-operating-system): Use 'host-9p-file-system' for the
store.
(common-qemu-options): Add 'shared-fs' parameter.
[virtfs-option]: New procedure.
Use it.
(system-qemu-image/shared-store-script): Adjust accordingly.
* gnu/artwork.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/services/xorg.scm: Use it.
(%artwork-repository): Remove.
* gnu/system/grub.scm: Use it.
(%artwork-repository): Remove.
* gnu/services/base.scm (user-unmount-service): New procedure.
* gnu/system.scm (essential-services): Use it.
* gnu/system/install.scm (cow-store-service): Mention it in comment.
* gnu/system/grub.scm (<grub-image>, <grub-theme>): New record types.
(%artwork-repository, %background-image): New variables.
(<grub-configuration>)[theme]: New field.
(svg->png, resize-image, grub-background-image, eye-candy): New
procedures.
(grub-configuration-file): Use 'eye-candy' and add it in BUILDER.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Add "$@" at
the end of the script.
(common-qemu-options): Remove trailing newline.
* doc/guix.texi (Invoking guix system): Document it.
* gnu/system/vm.scm (system-qemu-image/shared-store): Add
#:disk-image-size and #:full-boot? parameters and honor them. Pass
'#:copy-inputs? full-boot?', and change #:inputs argument.
* guix/scripts/system.scm (system-derivation-for-action): Pass
#:disk-image-size to 'system-qemu-image/shared-store'.
* doc/guix.texi (Invoking guix system): Mention use of '--image-size' in
conjunction with '--full-boot'.
This fixes regressions introduced in de1c158 ("system: Add support for
boot-time mapped devices.").
* doc/guix.texi (Initial RAM Disk): Adjust example with custom use of
'base-initrd'. Document #:mapped-devices parameter of 'base-initrd'.
* gnu/system/vm.scm (system-disk-image, system-qemu-image,
virtualized-operating-system): Adjust call to 'base-initrd' to new
signature.
* 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.
* gnu/services/base.scm (kvm-udev-rule): New procedure.
(udev-service): Use it, and add it to RULES.
(guix-build-accounts): Add "kvm" to the 'supplementary-groups' field.
* gnu/system/shadow.scm (%base-groups): Add "kvm".
* gnu/system/file-systems.scm (<mapped-device-type>): New record type.
(<mapped-device>)[command]: Remove field.
[type]: New field.
* gnu/services/base.scm (device-mapping-service): Rename 'command'
parameter to 'open'. Add 'close' parameter and honor it.
* gnu/system.scm (luks-device-mapping): Rename to...
(open-luks-device): ... this.
(close-luks-device): New procedure.
(luks-device-mapping): New variable.
(device-mapping-services): Get the type of MD, and pass its 'open' and
'close' fields to 'device-mapping-service'.
* gnu/system/file-systems.scm (<mapped-device>): New record type.
* gnu/system.scm (<operating-system>)[mapped-devices]: New field.
(luks-device-mapping): New procedure.
(other-file-system-services)[device-mappings, requirements]: New
procedures. Pass #:requirements to 'file-system-service'.
(device-mapping-services): New procedure.
(essential-services): Use it. Append its result to the return value.
(operating-system-initrd-file): Add comment.
* gnu/services/base.scm (file-system-service): Add #:requirements
parameter and honor it.
(device-mapping-service): New procedure.
* gnu/system/linux-initrd.scm (base-initrd): Add comment.
* 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.
* gnu/build/linux-initrd.scm (cache-compiled-file-name,
compile-to-cache, build-initrd): New procedures.
* gnu/system/linux-initrd.scm (expression->initrd)[builder]: Remove code
now moved above. Use 'build-initrd'.
* gnu/system/linux-initrd.scm (expression->initrd): Remove calls to
'imported-modules' and 'compiled-modules'. Use 'gexp->script' with
EXP. Add the result to TO-COPY. Make /init a symlink to that script,
and copy its closure into the "contents" directory. Add fake
/proc/self/exe symlink.
* gnu/build/linux-boot.scm (load-linux-module*): Add comment about mmap.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Add "-m
256". This turns out to be needed for initrds containing things like
e2fsck and several modules; with the default of 128 MiB, loading
libahci.ko may fail with -1.
* gnu/system/linux-initrd.scm (expression->initrd): Add 'graph-files'.
Use (guix build store-copy) and 'populate-store' instead of local
hack. Pass #:references-graphs to 'gexp->derivation'.
* guix/gexp.scm (lower-reference-graphs): New procedure.
(gexp->derivation)[graphs-file-names]: New procedure.
Use 'lower-reference-graphs', and augment #:inputs argument as a
function of #:references-graphs.
* doc/guix.texi (G-Expressions): Adjust 'gexp->derivation' documentation
accordingly.
* tests/gexp.scm ("gexp->derivation, store copy"): Remove reference to
TWO in BUILD-DRV. Use TWO directly in #:references-graphs argument.
("gexp->derivation #:references-graphs"): New test.
* gnu/system/vm.scm (qemu-image): Remove variable 'graph'; use INPUTS as
the #:references-graphs argument to
'expression->derivation-in-linux-vm'.
* gnu/system/linux-initrd.scm (expression->initrd)[string->regexp]:
Remove.
Use 'flat-linux-module-directory'. Remove the equivalent logic from
'builder'.
(flat-linux-module-directory): New procedure.
* gnu/build/linux-initrd.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system/linux-initrd.scm (expression->initrd): Use (gnu build
linux-initrd) and 'write-cpio-archive' instead of the inlined code.
Suggested by Mark H. Weaver.
* gnu/system/shadow.scm (<user-group>)[system?]: New field.
(%base-groups): Introduce 'system-group' macro, and use it.
* gnu/system.scm (user-group->gexp): Pass the 'system?' field.
* guix/build/activation.scm (add-group): Add #:system? and honor it.
(activate-users+groups): Handle the 'system?' field.
* gnu/system/file-systems.scm (%tty-gid): Choose an ID below 1000.
* doc/guix.texi (User Accounts): Document the 'system?' field.
* gnu/services/base.scm (unicode-start, console-font-service): New
procedures.
(%base-services): Call 'console-font-service' for TTY1 to TTY6.
* gnu/system/install.scm (installation-services): Add comment about the
console font. Call 'console-font-service' for TTY1 to TTY6.
This fixes a bug whereby, if #:allow-root-passwords was #f, 'groupadd'
would ask for a password. This is particularly problematic during
activation.
* gnu/system/linux.scm (rootok-pam-service): New procedure.
(base-pam-services): Use it for all the user* and group* commands.
* gnu/system/shadow.scm (<user-account>)[system?]: New field.
* gnu/system.scm (user-account->gexp): Add it.
* guix/build/activation.scm (add-user): Add #:system? parameter and
honor it.
(activate-users+groups): Handle the 'system?' part of user tuples.
Pass it to 'add-user'. Don't create PROFILE-DIR when SYSTEM? is
true.
* gnu/services/dbus.scm (dbus-service): Add 'system?' field for
"messagebus" account.
* gnu/services/base.scm (guix-build-accounts): Likewise.
* gnu/services/avahi.scm (avahi-service): Likewise.
* gnu/system.scm (<operating-system>)[packages]: Change default value to
%BASE-PACKAGES.
(%base-packages): New variable.
* gnu/system/install.scm (installation-os): Use it when defining the
'packages' field.
* doc/guix.texi (Using the Configuration System): Use %BASE-PACKAGES in
example. Remove now unneeded module imports. Explain this.
* gnu/system/file-systems.scm (<file-system>)[title]: New field.
* gnu/services/base.scm (file-system-service): Add #:title parameter.
In 'start' gexp, use 'canonicalize-device-spec' and honor TITLE.
* gnu/system.scm (other-file-system-services,
operating-system-root-file-system, operating-system-initrd-file):
Adjust accordingly.
* gnu/system/linux-initrd.scm (file-system->spec): Likewise.
* gnu/system/vm.scm (system-disk-image): Add 'title' field for the root
file system.
* guix/build/linux-initrd.scm (mount-file-system): Expect the second
element of SPEC to be the title.
(boot-system)[root-mount-point?, root-fs-type]: Likewise.
* gnu/services/dmd.scm (dmd-configuration-file): Select
'canonicalize-device-spec'.
* gnu/system/vm.scm (system-disk-image)[root-label]: New variable.
Use it for the root file system, and pass it as #:file-system-label to
'qemu-image'.
* guix/build/vm.scm (format-partition): Add #:label parameter, and honor
it.
(initialize-hard-disk): Add #:file-system-label parameter, and pass it
to 'format-partition'.
* gnu/system/vm.scm (qemu-image): Add #:file-system-label parameter and
pass it to 'initialize-hard-disk'.
* guix/build/vm.scm (load-in-linux-vm): When MAKE-DISK-IMAGE?, use
'-drive ...,if=virtio' for better performance.
* gnu/system/vm.scm (qemu-image): Use /dev/vda instead of /dev/sda.
This fixes a circular dependency between (gnu system) and (gnu system
linux-initrd), where the latter could end up being compiled before
'file-system-type' was defined as a macro.
* gnu/system.scm (<file-system>, %fuse-control-file-system,
%binary-format-file-system): Move to...
* gnu/system/file-systems.scm: ... here. New file.
* build-aux/hydra/demo-os.scm, gnu/system/linux-initrd.scm,
gnu/system/vm.scm: Use it.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system/grub.scm (<grub-configuration>): New record type.
(grub-configuration-file): Add 'config' parameter; remove
#:default-entry and #:timeout. Honor CONFIG.
* gnu/system.scm (<operating-system>): Remove 'bootloader-entries'
field; remove default value for 'bootloader' field.
(operating-system-grub.cfg): Pass the 'bootloader' field to
'grub-configuration-file'.
* build-aux/hydra/demo-os.scm (bootloader): New field.
* gnu/system.scm (etc-directory): Change default value of #:profile.
Change contents of SHELLS. Use /run/current-system/profile/{s,}bin in
BASHRC.
(operating-system-boot-script)[%modules]: Add (guix build
linux-initrd). Add call to 'activate-current-system' in gexp.
(operating-system-initrd-file, operating-system-grub.cfg): New
procedures.
(operating-system-derivation): Don't build grub.cfg here and remove it
from the file union.
* gnu/system/vm.scm (qemu-image): Remove #:populate.
(operating-system-build-gid, operating-system-default-contents):
Remove.
(system-qemu-image): Remove call to
'operating-system-default-contents'. Use 'operating-system-grub.cfg'
to get grub.cfg. Add GRUB.CFG to #:inputs.
(system-qemu-image/shared-store): Likewise, but don't add GRUB.CFG to
#:inputs.
(system-qemu-image/shared-store-script): Pass --system kernel option.
* guix/build/activation.scm (%booted-system, %current-system): New
variables.
(boot-time-system, activate-current-system): New procedures.
* guix/build/install.scm (evaluate-populate-directive): Add case
for ('directory name uid gid mode).
(directives, populate-root-file-system): New procedures.
* guix/build/vm.scm (initialize-hard-disk): Replace calls to
'evaluate-populate-directive' by a call to
'populate-root-file-system'.
* gnu/services/dmd.scm (dmd-configuration-file): Use
/run/current-system/profile/bin.
* gnu/services/xorg.scm (slim-service): Likewise.
* gnu/system/vm.scm (qemu-image): Rename #:inputs-to-copy to #:inputs,
and #:initialize-store? to #:register-closures?. Add #:copy-inputs?.
Adjust build gexp accordingly.
(system-qemu-image): Remove #:initialize-store? argument and add
#:copy-inputs?.
(system-qemu-image/shared-store): Add #:inputs, #:register-closures?,
and #:copy-inputs? arguments.
* guix/build/vm.scm (register-closure): New procedure.
(MS_BIND): New variable.
(initialize-hard-disk): Rename #:initialize-store? to
#:register-closures?, #:closures-to-copy to #:closures, and add
#:copy-closures?.
Add 'target-directory' and 'target-store' variables.
Call 'populate-store' only when COPY-CLOSURES?.
Bind-mount the store to TARGET-STORE when REGISTER-CLOSURES? and not
COPY-CLOSURES?. Add call to 'register-closure'.
* gnu/system/vm.scm (virtualized-operating-system): Instead of
completely overriding 'file-systems', use 'remove' to filter out some
of those declared in OS.
(system-qemu-image): Likewise.
* gnu/system.scm (operating-system-derivation)[boot-file-systems]: Keep "/".
* gnu/system/linux-initrd.scm (file-system->spec): Keep the 'check?'
flag.
(qemu-initrd)[helper-packages]: New variable. Pass it as #:to-copy.
<gexp>: Add 'set-path-environment-variable' call. Remove #:unionfs
argument for 'boot-system'.
* gnu/system/vm.scm (%linux-vm-file-systems): Add 'check?' field/
(virtualized-operating-system): Likewise for the "9p" file system.
* guix/build/linux-initrd.scm (mount-root-file-system): Change #:unionfs
default. Call 'check-file-system' before mounting ROOT, when
VOLATILE-ROOT? is false.
(check-file-system): New procedure.
(mount-file-system): Honor 'check?' element in list; add
'check-file-system' call.
(boot-system): Remove #:root-fs-type and #:unionfs parameters.
[root-mount-point?, root-fs-type]: New variables.
Call 'mount-file-system' on all MOUNTS but "/".
Fixes a regression introduced in 83bcd0b.
* gnu/system/vm.scm (system-qemu-image): Override the 'file-systems'
field of OS. Add #:file-system-type parameter and honor it.
* gnu/system.scm (<operating-system>)[initrd]: Default to
'qemu-initrd'.
(<file-system>): New record type.
(operating-system-root-file-system): New procedure.
(operating-system-derivation): Take the device name for GRUB from
'operating-system-root-file-system'. Pass the
'operating-system-initrd' procedure the list of boot file systems.
* gnu/system/linux-initrd.scm (file-system->spec): New procedure.
(qemu-initrd): Add 'file-systems' parameter, and remove #:mounts
parameter.
[file-system-type-predicate]: New procedure.
[linux-modules]: Use it.
Adjust #:mounts argument in 'boot-system' call.
(gnu-system-initrd): Remove.
* gnu/system/vm.scm (%linux-vm-file-systems): New variable.
(expression->derivation-in-linux-vm): Adjust call to 'qemu-initrd'.
(virtualized-operating-system): New procedure.
(system-qemu-image/shared-store-script)[initrd]: Remove. Use
'virtualized-operating-system'. Get the 'initrd' file from OS-DRV.
* guix/build/linux-initrd.scm (mount-qemu-smb-share, mount-qemu-9p):
Remove.
(MS_RDONLY, MS_BIND): New global variables.
(bind-mount): Remove local 'MS_BIND' definition.
(mount-root-file-system): New procedure, with code formerly in
'boot-system'.
(mount-file-system): New procedure.
(boot-system): Add #:root-fs-type parameter. Remove 'MS_RDONLY' local
variable. Use 'mount-root-file-system' and 'mount-file-system'.
* doc/guix.texi (Using the Configuration System): Add 'file-system'
declaration.
* gnu/system.scm (<operating-system>)[groups]: Change default to just
the 'root' group.
[sudoers]: New field.
(etc-directory): Add #:sudoers parameter. Add 'sudoers' to the
file union.
(operating-system-etc-directory): Pass #:sudoers to 'etc-directory'.
(%setuid-programs): Add 'sudo'.
(%sudoers-specification): New variable.
* gnu/system/linux.scm (base-pam-services): Add 'sudo'.
* build-aux/hydra/demo-os.scm: Add 'groups' field; add 'guest' to the
'wheel' group.
* gnu/system.scm (<operating-system>)[pam-services, setuid-programs]:
New fields.
(etc-directory)[bashrc]: Prepend /run/setuid-programs to $PATH.
(operating-system-etc-directory): Honor
'operating-system-pam-services'.
(%setuid-programs): New variable.
(operating-system-boot-script): Add (guix build utils) to the set of
imported modules. Call 'activate-setuid-programs' in boot script.
* gnu/system/linux.scm (base-pam-services): New procedure.
* guix/build/activation.scm (%setuid-directory): New variable.
(activate-setuid-programs): New procedure.
* build-aux/hydra/demo-os.scm: Add 'pam-services' field.
* gnu/system/linux-initrd.scm (expression->initrd): Rename 'inputs'
parameter to 'to-copy'. Remove 'files-to-copy'. Rewrite 'builder' as
a gexp, and use 'gexp->derivation'.
(qemu-initrd): Adjust accordingly.
* gnu/services.scm (<service>)[inputs]: Remove.
* gnu/system.scm (links): Remove.
(etc-directory): Add PASSWD and SHADOW to #:inputs.
(operating-system-boot-script): Pass ETC to 'dmd-configuration-file'.
(operating-system-derivation): Remove EXTRAS from the union.
* gnu/system/linux.scm (pam-service->configuration): Rewrite in terms of
'gexp->derivation'. Compute the contents on the build side. Expect
'arguments' to contain a list of gexps.
(pam-services->directory): Rewrite in terms of 'gexp->derivation'.
(unix-pam-service): Change 'arguments' to a list of one gexp.
* gnu/system/shadow.scm (<user-account>)[inputs]: Remove.
[shell]: Change default value to a gexp.
(passwd-file): Rewrite in terms of 'gexp->derivation'. Compute
contents on the build side.
* gnu/services/base.scm (host-name-service, mingetty-service,
nscd-service, syslog-service, guix-service): Change 'start' and 'stop'
to gexps; remove 'inputs' field.
(guix-build-accounts): Change 'shell' field to a gexp.
* gnu/services/networking.scm (static-networking-service): Change
'start' and 'stop' to gexps; remove 'inputs' field.
* gnu/services/xorg.scm (slim-service): Likewise.
* gnu/services/dmd.scm (dmd-configuration-file): Expect ETC to be a
derivation. Change 'config' to a gexp. Use 'gexp->file' instead of
'text-file'.
* doc/guix.texi (Defining Services): Update nscd example with gexps, and
without 'inputs'. Add xref to "G-Expressions".
* gnu/system.scm (operating-system-boot-script): Use 'gexp->file'
instead of 'text-file*'.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Likewise.
(system-qemu-image/shared-store-script)[builder]: Turn into a gexp.
Use 'gexp->derivation' instead of 'derivation-expression'.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Move
'initrd' definition to the top-level. Have a single definition of
'initrd', 'image', and 'os-drv'.
* guix/build/linux-initrd.scm (make-essential-device-nodes): Make
/dev/fuse.
(boot-system): Add #:unionfs parameter. Invoke UNIONFS instead of
copying files over when VOLATILE-ROOT? is true.
* gnu/system/linux-initrd.scm (expression->initrd): Add #:inputs
parameter.
[files-to-copy]: New procedure.
[builder]: Add 'to-copy' parameter; honor it.
(qemu-initrd)[linux-modules]: Add 'fuse.ko' when VOLATILE-ROOT?.
Pass UNIONFS-FUSE/STATIC as #:inputs; change builder to pass #:unionfs
to 'boot-system'.
* gnu/system/vm.scm (input->name+output): New procedure.
(expression->derivation-in-linux-vm): Use it for 'input-alist'.
(qemu-image)[input->name+derivation]: Remove. Use
'input->name+output' instead.
* gnu/system/vm.scm (system-qemu-image/shared-store-script): Change
#:qemu to default to QEMU. Change INITRD to use a 9p mount for the
store. Change command-line to use -virtfs.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Change #:qemu
to default to QEMU-HEADLESS. Use "-net nic,model=virtio". Remove
"-net user,smb=..." and add "-virtfs" options. Change default initrd
to include two 9p mounts.
* gnu/packages/gcc.scm (gcc-4.7): Change /nix/store in comment.
* gnu/system/vm.scm (operating-system-default-contents):
Use (%store-prefix) instead of "/nix/store".
* guix/derivations.scm (derivation-path->output-path,
derivation-path->output-paths): Change to /gnu/store in docstring.
* gnu/system/dmd.scm (xorg-service)[xserver.conf]: Change to use
'text-file*' instead of 'text-file'.
Adjust body accordingly. Remove now extraneous packages from the
service's 'inputs' field.
* gnu/system/vm.scm (operating-system-default-contents): Populate
/run/current-system and create /bin/sh.
* gnu/system.scm (operating-system-profile-derivation,
operating-system-profile-directory): New procedures.
(operating-system-derivation): Use it.
* gnu/system/linux-initrd.scm (qemu-initrd)[virtio-9p-modules]: New
variable.
[linux-modules]: Append VIRTIO-9P-MODULES when a 9p file system is in
MOUNTS.
* guix/build/linux-initrd.scm (mount-qemu-9p): New procedure.
(boot-system): Recognize '9p' in MOUNTS, and use 'mount-qemu-9p'.
* guix/build/linux-initrd.scm (make-essential-device-nodes): Rename
devices with major = 8 to /dev/sda*. Make /dev/vda* devices.
* gnu/system/vm.scm (qemu-image): Change '/dev/vda' to '/dev/sda'.
* gnu/system.scm (operating-system-derivation): Likewise.
Ludovic Courtès