installer: Fix device synchronization....Reported by Florian Pelz:
https://lists.gnu.org/archive/html/guix-devel/2020-11/msg00326.html.
* gnu/installer/utils.scm (call-with-time): New procedure,
(let/time): new macro.
* gnu/installer/parted.scm (with-delay-device-in-use?): Increase the retry
count to 16.
(non-install-devices): Remove the call to with-delay-device-in-use? as it
doesn't return the expected result, and would block much longer now.
(free-parted): Log the time required to sync each device.
installer: Use UUIDs in the 'swap-devices' field....Note: This change requires an updated 'guix' package that contains
Linux-swap support in (gnu build file-systems).
* gnu/installer/parted.scm (user-partitions->configuration): Use UUIDs
in the 'swap-devices' field.
* gnu/installer/newt/final.scm (run-final-page)[wait-for-clients]: New
procedure. Use it.
* gnu/installer/tests.scm (choose-partitioning): Wait for
'starting-final-step' message and move configuration file dialog
handling to...
(conclude-installation): ... here. Send over PORT the reply
corresponding to 'starting-final-step'.
* gnu/tests/install.scm (gui-test-program): When ENCRYPTED? is false,
invoke 'swaplabel' in the marionette.
(installation-target-os-for-gui-tests): When ENCRYPTED? is false, except
a fixed UUID.