gnu: Add linux-libre-arm64-generic-5.7.

* gnu/packages/linux (linux-libre-arm64-generic): New variable.

gnu: Add linux-libre 5.7.1.

* gnu/packages/linux (deblob-scripts-5.7): New variable.
  (linux-libre-5.7-version): New variable.
  (linux-libre-5.7-pristine-source): New variable.
  (linux-libre-5.7-source): New variable.
  (linux-libre-headers-5.7): New variable.

gnu: opensmtpd: Patch bug in 'smtpctl encrypt'.

* gnu/packages/mail.scm (opensmtpd)[phases]{fix-smtpctl-encrypt-bug}: New
phase.

gnu: Blender: Update to 2.83.0.

* gnu/packages/graphics.scm (blender): Update to 2.83.0.

gnu: font-liberation: Update to 2.1.1.

* gnu/packages/fonts.scm (font-liberation): Update to 2.1.1.

gnu: Add python-mechanize.

* gnu/packages/python-xyz.scm (python2-mechanize): Rename to ...
(python-mechanize): ... this.  Update to 0.4.5.
[arguments]: Remove.
[propagated-inputs]: Add PYTHON-HTML5LIB.
[home-page]: Update to current.
[license]: Set to LICENSE:BSD-3.
(python2-mechanize): Define in terms of PACKAGE-WITH-PYTHON2.

gnu: python-regex: Update to 2020.6.8.

* gnu/packages/python-xyz.scm (python-regex): Update to 2020.6.8.
[arguments]: New field.

gnu: python-netifaces: Update to 0.10.9.

* gnu/packages/python-xyz.scm (python-netifaces): Update to 0.10.9.

gnu: python-cssselect: Update to 1.1.0.

* gnu/packages/python-web.scm (python-cssselect): Update to 1.1.0.
[source]: Change to GIT-FETCH.
[arguments]: Remove #:tests?.  Add #:phases.
[native-inputs]: Add PYTHON-LXML and PYTHON-PYTEST.
[home-page]: Update to current.

gnu: python-odfpy: Update to 1.4.1.

* gnu/packages/python-xyz.scm (python-odfpy): Update to 1.4.1.
[arguments]: Remove #:modules.  Rewrite test phase to use pytest.
[native-inputs]: Add PYTHON-PYTEST.
[propagated-inputs]: Add PYTHON-DEFUSEDXML.

gnu: openssh: Remove exception to build without xauth for the Hurd.

* gnu/packages/ssh.scm (openssh)[inputs]: Unconditionally include xauth;
for the Hurd: use openssh-sans-x for now.

gnu: guix: Update to ab9e30039d.

* gnu/packages/package-management.scm (guix): Update to 1.1.0-1.ab9e30039d.

syscalls: set-thread-name, thread-name: Fix thinko.

* guix/build/syscalls.scm (set-thread-name, thread-name): Oops, fix thinko.

gnu: guix: Update to 68d8c09465.

* gnu/packages/package-management.scm (guix): Update to 1.1.0-1.68d8c09465.

gnu: services: Add %hurd-startup-service.

This decouples startup of the Hurd from the "hurd" package, moving the RC
script into SYSTEM.

* gnu/packages/hurd.scm (hurd)[inputs]: Remove hurd-rc-script.
[arguments]: Do not substitute it.  Update "runsystem.sh" to parse kernel
arguments and exec into --system=SYSTEM/rc.
(hurd-rc-script): Move to...
* gnu/services.scm (%hurd-rc-file): ...this new variable.
(hurd-rc-entry): New procedure.
(%hurd-startup-service): Use it in new variable.
* gnu/system.scm (hurd-default-essential-services): Use it.

hurd-boot: Further cleanup of "rc".

* gnu/packages/hurd.scm (hurd-rc-script): Move implementation to ...
* gnu/build/hurd-boot.scm (boot-hurd-system): ...here, new file.
* gnu/build/linux-boot.scm (make-hurd-device-nodes): Move there likewise.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

system: hurd: Populate services.

* gnu/system/hurd.scm (%base-services/hurd): Add hurd-console-service,
hurd-getty-services, guix-service.  Also add sylog and loopback, needed for
...
* gnu/system.scm (hurd-default-essential-services): ... add
%shepherd-root-service with dependencies: %boot-service, %activation-service,
user-processes, root-file-system-service, file-system-service,
pam-root-service.

services: Add `hurd-getty-service-type'.

* gnu/services/hurd.scm (<hurd-gettty-configuration>): New record.
(hurd-ttys-shepherd-service): New procedure.
(hurd-getty-service-type): New variable.
* doc/guix.texi (Hurd Services): Document it.

services: Add `hurd-console-service-type'.

* gnu/services/hurd.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Hurd Services): Document it.

gnu: hurd: Create minimal "runsystem" script to invoke "rc".

This moves towards a regular Guix startup, loading SYSTEM/boot to activate the
system and start the shepherd.

* gnu/packages/hurd.scm (hurd-rc-script): Update to handle "runsystem" tasks.
Load system/boot to activate the system and start the shepherd.  Create /hurd
symlink.
(hurd)[arguments]: Add 'create-runsystem' phase.  Do not substitute now unused
init.c, runsystem.hurd.  Substitute "/hurd/" for the fixed 'out + "/hurd/"' in
boot.c, console-run.c and startup.c.  Also substitute
_HURD_STARTUP ("/hurd/startup") to the fixed 'out + "/hurd/startup"' in
libdiskfs/boot-start.c and libdiskfs/opts-std-startup.c.