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

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

[Arthur Miller]

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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]

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

[Eli Zaretskii]

> From: Arthur Miller <arthur.miller.no1@gmail.com>
> Date: Wed, 9 Aug 2017 15:07:27 +0200
> 
> 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).

Can you explain how DICPATH enters this picture?  AFAIR, Hunspell
should be able to find its dictionaries without that variable,
assuming Hunspell is installed correctly.  So why do you need DICPATH?

In any case, please note that Emacs is not the one who looks at the
value of DICPATH: Hunspell is.  That value is _reported_ to Emacs, but
it's Hunspell that reports the value.  So maybe the problem is that
the value of DICPATH visible to Hunspell is empty or invalid.

(Caveat: I know almost nothing about systemd and related atrocities.)

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

[Glenn Morris]

Arthur Miller wrote:

> 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.

I don't see what D-Bus would have to do with this.
I imagine that the environment of Emacs when started from systemd is
different from when you start it normally, and something is missing that
means hunspell can't find its dictionaries.

You might compare the value of 'process-environment' in the two Emacs to
see what differs. Or M-x ispell-buffer-with-debug might provide more
information. Or edebug ispell-find-hunspell-dictionaries and step
through it to see where things go wrong.

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

[Arthur Miller]

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> Can you explain how DICPATH enters this picture?  AFAIR, Hunspell
> should be able to find its dictionaries without that variable,
> assuming Hunspell is installed correctly.  So why do you need DICPATH?

Above stack trace points to "ispell-parse-hunspell-affix-file", which seems
to
be a parser for affix files. But as I wrote I am not sure, I don't know so
much
about how emacs does stuff internally. Anyway, I have checked so that path
given to emacs is not empty. When I do (getenv "DICPATH") it prints correct
path where dictionaries are. Hunspell is found as well, and Hunspell itself
finds everything correctly when I check from shell.

> I don't see what D-Bus would have to do with this.
Systemd-bus is D-bus if I understood Systemd docs correctly. I am by no
means an expert in either d-bus or sytemd, just ordinary user.

> I imagine that the environment of Emacs when started from systemd is
> different from when you start it normally, and something is missing that
> means hunspell can't find its dictionaries.

Yeah, I imagined that too, so that is why I passed DICPATH to systemd
service as well but that didn't solve the problem. Here is service file. If
Emas gets it's paths from Hunspell, than it sounds as expected, and after
that the only thing I can imagine is problem is how strings are passed
between processes.

I looked at process-environment var and the content is different,
but what regards PATH and DICPATH it's same:

Emacs daemon started with systemd as user service:

("TERM=dumb" "DICPATH=~/.emacs.d/hunspell"
"INVOCATION_ID=af861fc0688846f6a70a09261064560f" "MANAGERPID=604"
"XDG_RUNTIME_DIR=/run/user/1000" "USER=*****" "SHELL=/bin/bash"
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin"
"MAIL=/var/spool/mail/*****" "LOGNAME=*****" "LANG=sv_SE.UTF-8"
"JOURNAL_STREAM=9:15268" "HOME=/home/*****"
"DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus")

Emacs daemon started from shell:

("OLDPWD=/home/*****" "_=/usr/local/bin/emacs" "HISTSIZE=5000"
"PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/opt/ant/bin:/opt/ant/bin"
"LARCH_PATH=/usr/share/splint/lib" "ANT_HOME=/opt/ant"
"XAUTHORITY=/home/*****/.Xauthority" "XDG_RUNTIME_DIR=/run/user/1000"
"DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus" "LOGNAME=*****"
"IRC_CLIENT=irssi" "SHLVL=3" "XDG_SEAT=seat0" "AUTOFEATURE=true autotest"
"TERM=dumb" "SHELL=/bin/bash" "WINDOWPATH=1" "VISUAL=emacsclient -c -a
emacs" "MAIL=/var/spool/mail/*****"
"_JAVA_OPTIONS=-Dsun.java2d.opengl=true" "GTK_MODULES=canberra-gtk-module"
"ALTERNATE_EDITOR=emacsclient -c -a emacs" "HOME=/home/*****"
"PWD=/home/*****/emacs" "TERMINOLOGY=1" "LSCOLORS=Gxfxcxdxdxegedabagacad"
"USER=*****" "XDG_SESSION_ID=c1" "HG=/usr/bin/hg" "SCM_CHECK=true"
"GIT_HOSTING=git@git.domain.com" "XDG_VTNR=1"
"JAVA_HOME=/usr/lib/jvm/default/jre"
"LCLIMPORTDIR=/usr/share/splint/imports" "EDITOR=emacsclient -t -a emacs
-t" "TODO=t" "HISTCONTROL=ignorespace:erasedups" "HISTIGNORE=pwd:ls:ls
-l:cd:cd ..:cd -:cd --" "TZ=:/etc/localtime" "LANG=sv_SE.UTF-8"
"DICPATH=/home/*****/.emacs.d/hunspell" "BASH_IT=/home/*****/.bash-it"
"BASH_IT_THEME=bobby" "XTERM_256_COLORS=1"
"LD_LIBRARY_PATH=:/usr/local/lib:/usr/local/lib" "GREP_COLOR=1;33")

When I run M-x ispell-buffer-with-debug, I get same backtrace as posted in
my original message. I also get following (*ispell-debug* buffer):

-- ispell-fhd: Skipping entry: AVAILABLE DICTIONARIES (path is not
mandatory for -d option):
-- ispell-fhd: Skipping entry: Can't open affix or dictionary files for
dictionary named "sv_SE".

I don't know it says it can't open entry, since I can see the dictionary,
and when started from shell, emacs has no problem opening it :).

I have to admit that I am not very proficient using edebug. To be honest I
have no idea how to step through code properly with it, and manual does
not give me much clues. It list all commands but one to use to step
through. I am probably just not smart enough to understand it. Anyway
stacktrace was gigantic, about 20 lines tall, but about 7800 chars wide so
I am not posting it here. But help how to step through and find more info
is appreciated.


2017-08-09 22:00 GMT+02:00 Glenn Morris <rgm@gnu.org>:

> Arthur Miller wrote:
>
> > 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.
>
> I don't see what D-Bus would have to do with this.
> I imagine that the environment of Emacs when started from systemd is
> different from when you start it normally, and something is missing that
> means hunspell can't find its dictionaries.
>
> You might compare the value of 'process-environment' in the two Emacs to
> see what differs. Or M-x ispell-buffer-with-debug might provide more
> information. Or edebug ispell-find-hunspell-dictionaries and step
> through it to see where things go wrong.
>
>
>

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

[npostavs]

Arthur Miller <arthur.miller.no1@gmail.com> writes:

> I looked at process-environment var and the content is different,
> but what regards PATH and DICPATH it's same:
>
> Emacs daemon started with systemd as user service:
>
> ("TERM=dumb" "DICPATH=~/.emacs.d/hunspell"
[...]

> Emacs daemon started from shell:
[...]
> "DICPATH=/home/*****/.emacs.d/hunspell"

Could the fact that you have "~" instead of "/home/****/" in the systemd
service be significant?  Does it help to change that?

> I have to admit that I am not very proficient using edebug. To be honest I
> have no idea how to step through code properly with it, and manual does
> not give me much clues. It list all commands but one to use to step
> through.

SPC is the stepping command (should be explained in `(elisp) Using
Edebug').

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

[Eli Zaretskii]

> From: npostavs@users.sourceforge.net
> Date: Thu, 10 Aug 2017 08:54:29 -0400
> Cc: 28025@debbugs.gnu.org
> 
> > Emacs daemon started with systemd as user service:
> >
> > ("TERM=dumb" "DICPATH=~/.emacs.d/hunspell"
> [...]
> 
> > Emacs daemon started from shell:
> [...]
> > "DICPATH=/home/*****/.emacs.d/hunspell"
> 
> Could the fact that you have "~" instead of "/home/****/" in the systemd
> service be significant?  Does it help to change that?

Indeed, I don't think Hunspell expands "~" in DICPATH.

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

[Glenn Morris]

Arthur Miller wrote:

>> I don't see what D-Bus would have to do with this.
> Systemd-bus is D-bus if I understood Systemd docs correctly.

That may be, but it's not relevant to what Emacs does once it is started.

> Emacs daemon started with systemd as user service:
>
> ("TERM=dumb" "DICPATH=~/.emacs.d/hunspell"

There is no variable expansion inside systemd's "Environment" specifier,
and I don't think it does tilde expansion anywhere.

https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Environment=

Specifiers work, so I guess you could use "%h" instead of "~".

https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Specifiers

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

[arthur.miller.no1]

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Aha. I guess you are ptobably correct. I am not at home again before tomorrow, but as soon as I am at home I will try it. Thanks!

Skickat från min Samsung-enhet

-------- Originalmeddelande --------
Från: Eli Zaretskii <eliz@gnu.org> 
Datum: 2017-08-10  17:18  (GMT+01:00) 
Till: npostavs@users.sourceforge.net 
Kopia: arthur.miller.no1@gmail.com, 28025@debbugs.gnu.org 
Rubrik: Re: bug#28025: Daemon/server passes string incorrectly to/from Systemd 

> From: npostavs@users.sourceforge.net
> Date: Thu, 10 Aug 2017 08:54:29 -0400
> Cc: 28025@debbugs.gnu.org
> 
> > Emacs daemon started with systemd as user service:
> >
> > ("TERM=dumb" "DICPATH=~/.emacs.d/hunspell"
> [...]
> 
> > Emacs daemon started from shell:
> [...]
> > "DICPATH=/home/*****/.emacs.d/hunspell"
> 
> Could the fact that you have "~" instead of "/home/****/" in the systemd
> service be significant?  Does it help to change that?

Indeed, I don't think Hunspell expands "~" in DICPATH.

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

[Arthur Miller]

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Yepp tilde in DICPATH was the problem! No bug in Emacs! :-)

I am so used to bash, so I always forgett it's bash that does the
expansion, and it fails
in cases like this.

Thank you all for the help!

2017-08-10 17:59 GMT+02:00 arthur.miller.no1 <arthur.miller.no1@gmail.com>:

> Aha. I guess you are ptobably correct. I am not at home again before
> tomorrow, but as soon as I am at home I will try it. Thanks!
>
>
> Skickat från min Samsung-enhet
>
>
> -------- Originalmeddelande --------
> Från: Eli Zaretskii <eliz@gnu.org>
> Datum: 2017-08-10 17:18 (GMT+01:00)
> Till: npostavs@users.sourceforge.net
> Kopia: arthur.miller.no1@gmail.com, 28025@debbugs.gnu.org
> Rubrik: Re: bug#28025: Daemon/server passes string incorrectly to/from
> Systemd
>
> > From: npostavs@users.sourceforge.net
> > Date: Thu, 10 Aug 2017 08:54:29 -0400
> > Cc: 28025@debbugs.gnu.org
> >
> > > Emacs daemon started with systemd as user service:
> > >
> > > ("TERM=dumb" "DICPATH=~/.emacs.d/hunspell"
> > [...]
> >
> > > Emacs daemon started from shell:
> > [...]
> > > "DICPATH=/home/*****/.emacs.d/hunspell"
> >
> > Could the fact that you have "~" instead of "/home/****/" in the systemd
> > service be significant?  Does it help to change that?
>
> Indeed, I don't think Hunspell expands "~" in DICPATH.
>

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

[Eli Zaretskii]

> From: Arthur Miller <arthur.miller.no1@gmail.com>
> Date: Fri, 11 Aug 2017 16:06:48 +0200
> Cc: 28025@debbugs.gnu.org
> 
> Yepp tilde in DICPATH was the problem! No bug in Emacs! :-)
> 
> I am so used to bash, so I always forgett it's bash that does the expansion, and it fails 
> in cases like this.
> 
> Thank you all for the help!

Thanks, I'm therefore closing this bug.