[bug#74819] [PATCH] services: elogind: Support Hook Directories

[45mg <45mg.writes@gmail.com>]

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Here's how I tested these changes if anyone is interested:

- Add the files included here into a `testdir` directory
- Compile
  guix shell -D guix --pure -- make
- Test in a container (no loginctl sessions, but will catch obvious errors)
  sudo $(./pre-inst-env guix system container path/to/testdir/test-config.scm)
- Test in a VM (need --full-boot for the ability to suspend, etc)
  $(./pre-inst-env guix system vm --full-boot path/to/testdir/test-config.scm)


[-- Attachment #2: test-config.scm --]
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(use-modules (gnu)
             (gnu home)
             (gnu home services dotfiles))
(use-service-modules cups desktop networking ssh xorg)

(operating-system
  (locale "en_US.utf8")
  (timezone "America/New_York")
  (keyboard-layout (keyboard-layout "us"))
  (host-name "guix-test")

  (users (cons* (user-account
                  (name "user")
                  (comment "Non-root user")
                  (group "users")
                  (home-directory "/home/user")
                  (supplementary-groups '("wheel" "netdev" "audio" "video")))
                %base-user-accounts))

  (packages %base-packages)

  (services
   (append (list (service elogind-service-type
                          (elogind-configuration
                           (system-sleep-hook-files
                            (list
                             (local-file
                              "test-sleep-script"))))))
           %base-services))

  (bootloader (bootloader-configuration
                (bootloader grub-bootloader)
                (targets (list "/dev/sda"))
                (keyboard-layout keyboard-layout)))

  (file-systems (cons* (file-system
                         (mount-point "/")
                         (device (file-system-label "dummy"))
                         (type "ext4"))
                       %base-file-systems)))

[-- Attachment #3: test-sleep-script --]
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#!/bin/sh
echo "$@" >> /root/elogind-test-sleep-log