Age | Commit message (Expand) | Author |
2021-06-29 | pack: Prevent duplicate files in tar archives....Tar translate duplicate files in the archive into hard links. These can cause
problems, as not every tool support them; for example dpkg doesn't.
* gnu/system/file-systems.scm (reduce-directories): New procedure.
(file-prefix?): Lift the restriction on file prefix. The procedure can be
useful for comparing relative file names. Adjust doc.
(file-name-depth): New procedure, extracted from ...
(btrfs-store-subvolume-file-name): ... here.
* guix/scripts/pack.scm (self-contained-tarball/builder): Use
reduce-directories.
* tests/file-systems.scm ("reduce-directories"): New test.
| Maxim Cournoyer |
2020-10-01 | Instantiate nscd in each system container....* gnu/system/linux-container.scm (%nscd-container-caches): New variable.
(containerized-operating-system): Instantiate nscd-service with smaller caches
and add it to the generated operating-system, replacing any nscd-service
specified by the caller.
* gnu/system/file-systems.scm: (%network-file-mappings): Remove "/var/run/nscd".
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
| Jason Conroy |
2020-08-03 | file-systems: Leave room for extension in serialized specs....* gnu/system/file-systems.scm (spec->file-system): Ignore extra fields.
(file-system->spec): Add comment.
| Ludovic Courtès |
2020-07-31 | file-system: Add efivarfs support....Tools such as efibootmgr rely on the deprecated /sys/firmware/efi/vars API as
well as on the new /sys/firmware/efi/efivars API. The latter needs to be
mounted.
Reported by Keyhenge here:
https://lists.gnu.org/archive/html/bug-guix/2020-04/msg00274.html
Here is the efivarfs documentation:
https://www.kernel.org/doc/Documentation/filesystems/efivarfs.txt.
* gnu/system/file-systems.scm (%efivars-file-system): New exported variable,
(%base-file-systems): add it.
* gnu/system/install.scm (%efivars-file-system): Add it.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
| Mathieu Othacehe |
2020-07-31 | file-system: Add mount-may-fail? option....* gnu/system/file-systems.scm (<file-system>): Add a mount-may-fail? field.
(file-system->spec): adapt accordingly,
(spec->file-system): ditto.
* gnu/build/file-systems.scm (mount-file-system): If 'system-error is raised
and mount-may-fail? is true, ignore it. Otherwise, re-raise the exception.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
| Mathieu Othacehe |
2020-07-31 | file-systems: Add %debug-file-system....* gnu/system/file-systems.scm (%debug-file-system): New variable,
(%base-file-systems): add it.
| Mathieu Othacehe |
2020-07-25 | file-systems: Convey hint via '&fix-hint'....* gnu/system/file-systems.scm (btrfs-store-subvolume-file-name): Use
'&fix-hint' for the hint.
| Ludovic Courtès |
2020-05-20 | bootloader: grub: Allow booting from a Btrfs subvolume....* gnu/bootloader/grub.scm (strip-mount-point): Remove procedure.
(normalize-file): Add procedure.
(grub-configuration-file): New BTRFS-SUBVOLUME-FILE-NAME parameter. When
defined, prepend its value to the kernel and initrd file names, using the
NORMALIZE-FILE procedure. Adjust the call to EYE-CANDY to pass the
BTRFS-SUBVOLUME-FILE-NAME argument. Normalize the KEYMAP file as well.
(eye-candy): Add a BTRFS-SUBVOLUME-FILE-NAME parameter, and use it, along with
the NORMALIZE-FILE procedure, to normalize the FONT-FILE and IMAGE nested
variables. Adjust doc.
* gnu/bootloader/depthcharge.scm (depthcharge-configuration-file): Adapt.
* gnu/bootloader/extlinux.scm (extlinux-configuration-file): Likewise.
* gnu/system/file-systems.scm (btrfs-subvolume?)
(btrfs-store-subvolume-file-name): New procedures.
* gnu/system.scm (operating-system-bootcfg): Specify the Btrfs
subvolume file name the store resides on to the
`operating-system-bootcfg' procedure, using the new
BTRFS-SUBVOLUME-FILE-NAME argument.
* doc/guix.texi (File Systems): Add a Btrfs subsection to document the use of
subvolumes.
* gnu/tests/install.scm (%btrfs-root-on-subvolume-os)
(%btrfs-root-on-subvolume-os-source)
(%btrfs-root-on-subvolume-installation-script)
(%test-btrfs-root-on-subvolume-os): New variables.
| Maxim Cournoyer |
2020-05-20 | file-systems: Add helpers for parsing the options string into an alist....* gnu/system/file-systems.scm (file-system-options->alist)
(alist->file-system-options): New procedures.
* tests/file-systems.scm: New tests.
* doc/guix.texi (File Systems): Add note about the newly added procedures.
| Maxim Cournoyer |
2020-04-27 | file-systems: mount the PID cgroup filesystem....* gnu/system/file-systems.scm (%control-groups): Add "pids".
* gnu/services/docker.scm (docker-shepherd-service): Resolve a TODO.
This has allowed me to make a specific configuration of nsjail work.
| Jakub Kądziołka |
2020-03-02 | file-systems: Add a 'file-system-device->string' procedure....* gnu/system/file-systems.scm (file-system-device->string): New procedure.
* gnu/system.scm (bootable-kernel-arguments): Use it.
* gnu/system/vm.scm (operating-system-uuid): Likewise.
* guix/scripts/system.scm (display-system-generation): Likewise.
| Maxim Cournoyer |
2019-11-04 | file-systems: Mount /var/run/nscd read-write in containers....Fixes <https://bugs.gnu.org/37967>.
Reported by Ivan Vilata i Balaguer <ivan@selidor.net>.
* gnu/system/file-systems.scm (%network-file-mappings): Set 'writable?'
to #true for /var/run/nscd.
| Ludovic Courtès |
2019-09-12 | file-systems: Add /var/run/nscd to '%network-file-mappings'....This allows containers created by "guix environment -CN" or by
"guix system container -N" to talk to the host nscd.
* gnu/system/file-systems.scm (%network-file-mappings): Add
"/var/run/nscd".
* gnu/build/shepherd.scm (default-mounts)[nscd-socket]: Remove.
* gnu/system/linux-container.scm (container-script)[nscd-run-directory]
[nscd-mapping, nscd-os, nscd-specs]: Remove.
[script]: Filter out from SPECS bind-mounts where the device does not
exist.
* guix/scripts/environment.scm (launch-environment/container)
[optional-mapping->fs]: New procedure.
[mappings]: Remove %NETWORK-FILE-MAPPINGS.
[file-systems]: Add %NETWORK-FILE-MAPPINGS here, filtered through
'optional-mapping->fs'.
| Ludovic Courtès |
2019-07-19 | file-systems: Use 'no-atime' for %IMMUTABLE-STORE....* gnu/system/file-systems.scm (%immutable-store): Add 'no-atime'.
| Ludovic Courtès |
2018-06-14 | install: Use (guix store database) instead of 'guix-register'....* gnu/build/install.scm (register-closure): Add #:reset-timestamps? and
and #:schema; honor them. Rewrite in terms of 'register-path'.
(populate-single-profile-directory): Add #:schema and honor it. Make
/var/guix/profiles and /var/guix/gcroots.
* gnu/build/vm.scm (root-partition-initializer): Pass
#:reset-timestamps? to 'register-closure'.
* gnu/system/vm.scm (not-config?): New procedure.
(guile-sqlite3&co): New variable.
(expression->derivation-in-linux-vm)[config]: New variable.
[builder]: Use 'with-extensions'.
(iso9660-image)[schema, config]: New variables.
Wrap build expression in 'with-extensions'; add 'sql-schema' call.
Remove GUIX from INPUTS.
(qemu-image)[schema, config]: New variables.
Wrap body in 'with-extensions'.
(system-docker-image)[not-config?]: Remove.
[config]: Use 'make-config.scm'.
[schema]: New variable.
[build]: Use 'with-extensions'. Add call to 'sql-schema'. Remove GUIX
from INPUTS.
* gnu/system/file-systems.scm (%store-prefix): Check whether
'%store-prefix' is defined.
* guix/scripts/pack.scm (self-contained-tarball)[not-config?]
[libgcrypt, schema]: New variables.
[build]: Wrap in 'with-extensions'. Adjust imported module list to use
'make-config.scm' for (guix config).
| Ludovic Courtès |
2018-05-28 | file-systems: Remove 'title' field and add <file-system-label>....The 'title' field was easily overlooked and was an endless source of
confusion. Now, the value of the 'device' field is self-contained.
* gnu/system/file-systems.scm (<file-system>): Change constructor name
to '%file-system'.
[title]: Remove.
(<file-system-label>): New record type with printer.
(report-deprecation, device-expression)
(process-file-system-declaration, file-system): New macros.
(file-system-title): New procedure.
(file-system->spec, spec->file-system): Adjust to handle
<file-system-label>.
* gnu/system.scm (bootable-kernel-arguments): Add case for
'file-system-label?'.
(read-boot-parameters): Likewise.
(mapped-device-user): Avoid 'file-system-title'.
(fs->boot-device): Remove.
(operating-system-boot-parameters): Use 'file-system-device' instead of
'fs->boot-device'.
(device->sexp): Add case for 'file-system-label?'.
* gnu/bootloader/grub.scm (grub-root-search): Add case for
'file-system-label?'.
* gnu/system/examples/bare-bones.tmpl,
gnu/system/examples/beaglebone-black.tmpl,
gnu/system/examples/lightweight-desktop.tmpl,
gnu/system/examples/vm-image.tmpl: Remove uses of 'title'.
* gnu/system/vm.scm (virtualized-operating-system): Remove uses of
'file-system-title'.
* guix/scripts/system.scm (check-file-system-availability): Likewise,
and adjust fix-it hint.
(check-initrd-modules)[file-system-/dev]: Likewise.
* gnu/build/file-systems.scm (canonicalize-device-spec): Remove 'title'
parameter.
[canonical-title]: Remove.
Match on SPEC's type rather than on CANONICAL-TITLE.
(mount-file-system): Adjust caller.
* gnu/build/linux-boot.scm (boot-system): Interpret ROOT here.
* gnu/services/base.scm (file-system->fstab-entry): Remove use of
'file-system-title'.
* doc/guix.texi (File Systems): Remove documentation of the 'title'
field. Rewrite documentation of 'device' and document
'file-system-label'.
| Ludovic Courtès |
2018-05-19 | file-systems: Do not export <file-system>....* gnu/system/file-systems.scm (<file-system>): Do not export.
* gnu/system.scm (operating-system-root-file-system): Use an accessor
instead of 'match'.
| Ludovic Courtès |
2018-04-29 | file-systems: Expound '%pseudo-file-system-types'....Reported by Tobias Geerinckx-Rice <me@tobias.gr>.
* gnu/system/file-systems.scm (%pseudo-file-system-types): Add
"debugfs", "efivarfs", "hugetlbfs", "overlay", and "securityfs".
| Ludovic Courtès |
2018-04-27 | guix system: Report wrong file system 'device' fields....Previously, if you wrote (device "my-label") without (title 'label),
you'd get:
guix system: error: stat: No such file or directory: "my-label"
Now you get a proper error and a hint.
Reported by Pierre-Antoine Rouby.
* guix/scripts/system.scm (check-file-system-availability)[literal]: New
variable. Loop over LITERAL.
* gnu/system/file-systems.scm (%pseudo-file-system-types): New variable.
* guix/ui.scm (display-hint): Make public.
| Ludovic Courtès |
2017-12-22 | file-systems: Move %control-groups from %base-file-systems to...%elogind-file-systems.
* gnu/system/file-systems.scm (%base-file-systems): Move %control-groups from
here, to ...
(%elogind-file-systems): ... here.
| Mathieu Othacehe |
2017-12-22 | file-systems: Do not mount hugetlb cgroup filesystem....On ARM32 without LPAE support, hugetlb control group is not supported.
As it is not needed by elogind, remove it for all platforms.
* gnu/system/file-systems.scm (%control-groups): Remove hugetlb from control
groups platforms.
| Mathieu Othacehe |
2017-10-11 | file-systems: Preserve UUID types when serializing....Reported by Roel Janssen <roel@gnu.org>
at <https://lists.gnu.org/archive/html/help-guix/2017-09/msg00094.html>.
* gnu/system/file-systems.scm (file-system->spec): When DEVICE is a
UUID, serialize it in a way that preserves its type.
(spec->file-system): Adjust accordingly.
* gnu/build/file-systems.scm (canonicalize-device-spec): Add case for
when SPEC is 'uuid?'.
| Ludovic Courtès |
2017-10-05 | file-systems: Add a 'location' field to <file-system>....* gnu/system/file-systems.scm (<file-system>)[location]: New field.
| Ludovic Courtès |
2017-09-11 | system: Introduce a disjoint UUID type....Conceptually a UUID is just a bytevector. However, there's software out
there such as GRUB that relies on the string representation of different
UUID types (e.g., the string representation of DCE UUIDs differs from
that of ISO-9660 UUIDs, even if they are actually bytevectors of the
same length). This new <uuid> record type allows us to preserve
information about the type of UUID so we can eventually convert it to a
string using the right representation.
* gnu/system/uuid.scm (<uuid>): New record type.
(bytevector->uuid): New procedure.
(uuid): Return calls to 'make-uuid'.
(uuid->string): Rewrite using 'match-lambda*' to accept a single 'uuid?'
argument.
* gnu/bootloader/grub.scm (grub-root-search): Check for 'uuid?' instead
of 'bytevector?'.
* gnu/system.scm (bootable-kernel-arguments): Check whether ROOT-DEVICE
is 'uuid?'.
(read-boot-parameters): Use 'bytevector->uuid' when the
store device is a bytevector.
(read-boot-parameters-file): Check for 'uuid?' instead of 'bytevector?'.
(device->sexp): New procedure.
(operating-system-boot-parameters-file): Use it for 'root-device' and
'store'.
(operating-system-bootcfg): Remove conditional in definition of
'root-device'.
* gnu/system/file-systems.scm (file-system->spec): Check for 'uuid?' on
DEVICE and take its bytevector.
* gnu/system/mapped-devices.scm (open-luks-device): Likewise.
* gnu/system/vm.scm (iso9660-image): Call 'uuid-bytevector' for the
#:volume-uuid argument.
| Ludovic Courtès |
2017-09-11 | file-systems: Introduce (gnu system uuid)....* gnu/build/file-systems.scm (sub-bytevector)
(latin1->string, %fat32-endianness, fat32-uuid->string)
(%iso9660-uuid-rx, string->iso9660-uuid)
(iso9660-uuid->string, %network-byte-order)
(dce-uuid->string, %uuid-rx, string->dce-uuid)
(string->ext2-uuid, string->ext3-uuid, string->ext4-uuid)
(vhashq, %uuid-parsers, %uuid-printers, string->uuid)
(uuid->string): Move to...
* gnu/system/uuid.scm: ... here. New file.
* gnu/system/file-systems.scm (uuid): Move to the above file.
* gnu/system/vm.scm: Adjust accordingly.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add uuid.scm.
| Ludovic Courtès |
2017-03-21 | file-systems: Add missing docstring....* gnu/system/file-systems.scm (file-system-type-predicate): Add
docstring.
| Ludovic Courtès |
2017-03-21 | file-systems: Do not use (gnu packages …)....Fixes a regression introduced in
7208995426714c9fc3ad59cadc3cc0f52df0f018 whereby (gnu system
file-systems) would pull in (gnu packages …) module, which in turn
breaks when importing things like (gnu build shepherd).
* gnu/system/file-systems.scm (file-system-type-predicate): Export.
(file-system-packages): Move to...
* gnu/system/linux-initrd.scm (file-system-packages): ... here. Add
docstring.
* gnu/services/base.scm: Use it.
* tests/file-systems.scm ("does not pull (gnu packages …)"): New test.
| Ludovic Courtès |
2017-03-18 | file-systems: Factorize file-system-packages....* gnu/system/linux-initrd.scm (base-initrd): Move helper-packages body to ...
* gnu/system/file-systems.scm (file-system-packages): ... here. New variable.
Also export it.
| Danny Milosavljevic |
2017-02-07 | file-systems: Add '%network-configuration-files' and '%network-file-mappings'....* gnu/system/file-systems.scm (%network-configuration-files)
(%network-file-mappings): New variables.
* guix/scripts/environment.scm (%network-configuration-files): Remove.
(launch-environment/container): Refer to '%network-file-mappings'
instead of calling 'filter-map'.
| Ludovic Courtès |
2017-02-04 | file-systems: Remove dependency on (guix store)....(gnu system file-systems) is used on the "build" side since commit
5970e8e248f6327c41c83b86bb2c89be7c3b1b4e.
* gnu/system/file-systems.scm: Remove dependency on (guix store).
(%store-prefix): New procedure.
* tests/file-systems.scm ("does not pull (guix config)"): New test.
| Ludovic Courtès |
2017-02-03 | file-systems: Add 'file-system-mapping->bind-mount'....* gnu/system/file-systems.scm (file-system-mapping->bind-mount): New
procedure.
* gnu/system/linux-container.scm (mapping->file-system): Remove.
(containerized-operating-system)[mapping->fs]: Use
'file-system-mapping->bind-mount' instead of 'mapping->file-system'.
* guix/scripts/environment.scm (launch-environment/container): Likewise.
| Ludovic Courtès |
2017-01-16 | file-systems: 'file-system-needed-for-boot?' is #t for parents of the store....Suggested by John Darrington <john@darrington.wattle.id.au>.
* gnu/system/file-systems.scm (%not-slash): New variable.
(file-prefix?): New procedure.
(file-system-needed-for-boot?): Use it to check whether FS holds the
store.
* tests/file-systems.scm ("file-system-needed-for-boot?"): New test.
* gnu/tests/install.scm (%separate-store-os)[file-systems]: Remove
'needed-for-boot?' field for "/gnu".
| Ludovic Courtès |
2016-11-10 | container: Pass a list of <file-system> objects as things to mount....* gnu/build/linux-container.scm (mount-file-systems): 'mounts' is now a
list of <file-system> objects instead of a list of lists ("specs").
Add call to 'file-system->spec' as the argument to 'mount-file-system'.
(run-container, call-with-container): Adjust docstring accordingly.
* gnu/system/file-systems.scm (spec->file-system): New procedure.
* gnu/system/linux-container.scm (container-script)[script]: Call
'spec->file-system' inside gexp.
* guix/scripts/environment.scm (launch-environment/container): Remove
call to 'file-system->spec'.
* tests/containers.scm ("call-with-container, mnt namespace")
("call-with-container, mnt namespace, wrong bind mount"): Pass a list of
<file-system> objects.
| Ludovic Courtès |
2016-09-27 | Add missing exports....Reported by Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>
at <https://lists.gnu.org/archive/html/guix-devel/2016-09/msg01686.html>.
* gnu/system/file-systems.scm (%tty-gid): Export.
* guix/build-system/python.scm (default-python, default-python2):
Export.
| Ludovic Courtès |
2016-09-01 | Reinstate "services: elogind: Provide '%elogind-file-systems' by extension."...This reverts commit 17073dafc59d62fb8cbb8b94d61d3ecc488ac59f.
| Ludovic Courtès |
2016-08-22 | Revert "services: elogind: Provide '%elogind-file-systems' by extension."...This reverts commit 3cf319a3f8e23831960a0f1320122cc514188a37.
| Mark H Weaver |
2016-08-22 | services: elogind: Provide '%elogind-file-systems' by extension....* gnu/system/file-systems.scm (%base-file-systems): Remove
%ELOGIND-FILE-SYSTEMS.
* gnu/services/desktop.scm (elogind-service-type): Extend
FILE-SYSTEM-SERVICE-TYPE to provide %ELOGIND-FILE-SYSTEMS.
| Ludovic Courtès |
2016-08-04 | ui: Remove dependency on (gnu system file-systems)....* guix/ui.scm (specification->file-system-mapping): Move to...
* gnu/system/file-systems.scm (specification->file-system-mapping):
... here.
| Ludovic Courtès |
2016-06-06 | file-systems: Remove unneeded import....* gnu/system/file-systems.scm: Remove import of (guix gexp), unneeded
since commit 060d62a740fc1932a3be505534feff099b59ac9f.
| Ludovic Courtès |
2016-04-18 | system: Add (gnu system mapped-devices)....* gnu/system/file-systems.scm (<mapped-device>, <mapped-device-type>):
Move to...
* gnu/system/mapped-devices.scm: ... here. New file.
* gnu/system.scm, gnu/services/base.scm,
gnu/system/linux-initrd.scm: Use it.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu.scm (%public-modules): Add it.
| Ludovic Courtès |
2016-03-07 | gnu: system: Add elogind cgroup mount....* gnu/system/file-systems.scm (%elogind-file-systems): Add elogind
cgroup mount.
| Andy Wingo |
2016-01-01 | file-systems: Move 'string->uuid' to the build side....* gnu/system/file-systems.scm (%uuid-rx, string->uuid): Move to...
* gnu/build/file-systems.scm (%uuid-rx, string->uuid): ... here. New
variables.
| Ludovic Courtès |
2015-12-22 | file-systems: Add a 'mount?' field....Fixes <http://bugs.gnu.org/22176>.
Reported by Florian Paul Schmidt <mista.tapas@gmx.net>.
* gnu/system/file-systems.scm (<file-system>)[mount?]: New field.
(file-system->spec): Adjust accordingly.
* gnu/services/base.scm (file-system-dmd-service): Return the empty list
when FILE-SYSTEM has 'mount?' set to false.
(user-processes-service): Select the subset of FILE-SYSTEMS that matches
'file-system-mount?'.
* doc/guix.texi (File Systems): Document it.
| Ludovic Courtès |
2015-10-29 | system: File systems depend on their corresponding device mappings....Fixes a regression introduced in commit 0adfe95.
* gnu/system.scm (other-file-system-services)[requirements]: Remove.
[add-dependencies]: New procedure.
Use it.
* gnu/system/file-systems.scm (<file-system>)[dependencies]: Update
comment.
* gnu/services/base.scm (mapped-device->dmd-service-name,
dependency->dmd-service-name): New procedures.
(file-system-service-type): Use it.
| Ludovic Courtès |
2015-09-20 | linux-boot: Mount /dev as a devtmpfs from the start....Suggested by Petter <petter@mykolab.ch>
and Mark H Weaver <mhw@netris.org>.
Reported by Duncan Keall <duncan@duncankeall.com>.
Partly fixes <http://bugs.gnu.org/19190> by populating /dev/mapper
early enough.
* gnu/build/linux-boot.scm (mount-essential-file-systems): Mount /dev as
a devtmpfs.
(move-essential-file-systems): Add /dev.
(mount-root-file-system): Mount /rw-root/dev as a devtmpfs instead of
calling 'make-essential-device-nodes'.
(boot-system): Remove call to 'make-essential-device-nodes'.
* gnu/system/file-systems.scm (%devtmpfs-file-system): Remove.
* doc/guix.texi (File Systems): Adjust accordingly.
| Ludovic Courtès |
2015-09-10 | file-systems: Add %elogind-file-systems; add it to %base-file-systems....* gnu/system/file-systems.scm (%elogind-file-systems): New variable.
(%base-file-systems): Add %elogind-file-systems.
| Mark H Weaver |
2015-07-17 | file-systems: Subsystem cgroups now depend on /sys/fs/cgroup....* gnu/system/file-systems.scm (%control-groups): Define 'parent' variable.
Initialize the 'dependencies' field for all the subsystems.
| Ludovic Courtès |
2015-07-17 | file-systems: Add a 'dependencies' field to <file-system>....* gnu/system/file-systems.scm (<file-system>)[dependencies]: New field.
* gnu/system.scm (other-file-system-services)[requirements]: Honor
'file-system-dependencies'.
* doc/guix.texi (File Systems): Document it.
| Ludovic Courtès |
2015-07-16 | file-systems: 'uuid' raises a syntax error for invalid UUIDs....* gnu/system/file-systems.scm (uuid): Call 'syntax-violation' when
'string->uuid' returns #f.
* tests/file-systems.scm ("uuid, syntax error"): New test.
| Ludovic Courtès |
2015-07-14 | file-systems: Allow users to specify file system UUIDs as strings....Fixes <http://bugs.gnu.org/19778>.
Reported by Mark H Weaver <mhw@netris.org>.
* gnu/system/file-systems.scm (%uuid-rx): New variable.
(string->uuid): New procedure.
(uuid): New macro.
* tests/file-systems.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* doc/guix.texi (File Systems): Give an example of UUID.
| Ludovic Courtès |