bug#28025: Daemon/server passes string incorrectly to/from Systemd

[Arthur Miller]

When I start Emacs in daemon mode with Systemd and connect with
emacsclient, I get nil string when I run spellcheck with ispell.
'ispell-word' stack trace from debugger:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  string-match("," nil 0)
  split-string(nil "," t)
  ispell-parse-hunspell-affix-file(nil)
  ispell-find-hunspell-dictionaries()
  ispell-set-spellchecker-params()
  ispell-word(nil nil nil t)
  funcall-interactively(ispell-word nil nil nil t)
  call-interactively(ispell-word nil nil)
  command-execute(ispell-word)

When I start emacs in daemon mode from bash command line
directly and connect with emacsclient the spellcheck
works correctly.

I have checked that all paths are setup correctly. Emacs finds
dictionaries (DICPATH setts correctly in systemd service file),
and it also finds spellchecking program (/usr/bin/hunspell).

I believe it might be something with passing strings to and from
d-bus, but I don't have experience with d-bus at all so I really
don't know. It might as well be something completely else,
including my configuration :-).

/arthur


In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
 of 2017-08-03 built on pascal
Repository revision: f465efe412607c6b931e3592e96200f2ff3b8d74
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
Recent messages:
Cleaning up the recentf list...
File /home/arthur/test.txt removed from the recentf list
Cleaning up the recentf list...done (1 removed)
When done with a buffer, type C-x # [2 times]
Cleaning up the recentf list...done (0 removed)
When done with this frame, type C-x 5 0
split-string: Wrong type argument: stringp, nil
"~/.emacs.d/hunspell"
Cleaning up the recentf list...done (0 removed)
Making completion list... [3 times]

Configured using:
 'configure --with-modules --with-mailutils --without-pop'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 MODULES LIBSYSTEMD

Important settings:
  value of $LANG: sv_SE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  electric-pair-mode: t
  show-paren-mode: t
  global-ede-mode: t
  global-fci-mode: t
  auto-insert-mode: t
  dumb-jump-mode: t
  ranger-override-dired-mode: t
  global-auto-revert-mode: t
  global-hl-line-mode: t
  winner-mode: t
  save-place-mode: t
  recentf-mode: t
  global-company-mode: t
  company-mode: t
  window-number-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  semantic-mode: t
  which-function-mode: t
  helm-mode: t
  shell-dirtrack-mode: t
  helm-autoresize-mode: t
  async-bytecomp-package-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  fci-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  override-global-mode: t
  cl-old-struct-compat-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/arthur/.emacs.d/plugins/company/company-cmake hides /home/arthur/.emacs.d/plugins/company-cmake/company-cmake
/home/arthur/.emacs.d/lisp/fill-column-indicator hides /home/arthur/.emacs.d/plugins/fill-column-indicator/fill-column-indicator
/home/arthur/.emacs.d/plugins/helm/helm hides /home/arthur/.emacs.d/plugins/helm-core/helm
/home/arthur/.emacs.d/plugins/helm/helm-multi-match hides /home/arthur/.emacs.d/plugins/helm-core/helm-multi-match
/home/arthur/.emacs.d/plugins/helm/helm-source hides /home/arthur/.emacs.d/plugins/helm-core/helm-source
/home/arthur/.emacs.d/plugins/helm/helm-lib hides /home/arthur/.emacs.d/plugins/helm-core/helm-lib
/home/arthur/.emacs.d/plugins/load-relative/el-get-install hides /home/arthur/.emacs.d/plugins/loc-changes/el-get-install
/home/arthur/.emacs.d/plugins/load-relative/el-get-install hides /home/arthur/.emacs.d/plugins/realgud/el-get-install
/home/arthur/.emacs.d/plugins/realgud/realgud hides /home/arthur/.emacs.d/plugins/xxrealgud/realgud
/usr/local/share/emacs/26.0.50/lisp/simple hides /home/arthur/.emacs.d/plugins/emacs-ctable/samples/simple
/home/arthur/.emacs.d/plugins/loc-changes/test/test-basic hides /home/arthur/.emacs.d/plugins/test-simple/test/test-basic
/usr/local/share/emacs/26.0.50/lisp/env hides /home/arthur/.emacs.d/plugins/emacs-window-manager/features/support/env
/usr/local/share/emacs/26.0.50/lisp/env hides /home/arthur/.emacs.d/plugins/multiple-cursors/features/support/env

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tramp-compat tramp-loaddefs trampver ucs-normalize shell pcomplete
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eieio eieio-core eieio-loaddefs ring js-mode-expansions js time-date
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byte-compile cconv cc-mode-expansions cc-mode cc-fonts cc-guess cc-menus
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base64 format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

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