[systemd-bugs] [Bug 90185] New: Trying to unset Standard{Input, Output, Error}= directive to defaults in drop-in fails: Failed to parse {input, output} specifier, ignoring:

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90185

            Bug ID: 90185
           Summary: Trying to unset Standard{Input,Output,Error}=
                    directive to defaults in drop-in fails: Failed to
                    parse {input,output} specifier, ignoring:
           Product: systemd
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: a.c.kalker at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

Steps to reproduce:

- Create a drop-in file to override StandardInput= StandardOutput=
StandardError= as set in a service and restore them to their default values.

Example (here I'm trying to debug why keyboard doesn't work in emergency mode,
not the best example, I know...):
---[/etc/systemd/system/emergency.service.d/debug.conf]---
[Service]
# Clear ExecStartPre=
ExecStartPre=
# Are the tty,std{in,out,error} devices there?
ExecStartPre=-/usr/bin/ls -la /dev
ExecStartPre=-/bin/echo -e 'Welcome to emergency mode! After logging in, type
"journalctl -xb" to view\\nsystem logs, "systemctl reboot" to reboot,
"systemctl default" or ^D to\\ntry again to boot into default mode.'

# Clear these out to defaults, see what happens...
# StandardInput=tty-force
StandardInput=
# StandardOutput=inherit
StandardOutput=
# StandardError=inherit
StandardError=
# Don't know about the next one, don't touch it for now
# IgnoreSIGPIPE=no

Actual result:

[    0.506012] systemd[1]:
[/etc/systemd/system/emergency.service.d/debug.conf:10] Failed to parse input
specifier, ignoring: 
[    0.506865] systemd[1]:
[/etc/systemd/system/emergency.service.d/debug.conf:12] Failed to parse output
specifier, ignoring: 
[    0.507699] systemd[1]:
[/etc/systemd/system/emergency.service.d/debug.conf:14] Failed to parse output
specifier, ignoring: 

Expected result:

Setting these directives to the empty value in a drop-in should set them to
their default values.

Requiring users to explicitly specify that default value is IMHO not a good
option, as that default might change over the course of the development of
systemd. There should always be a way for drop-ins to 'undo' setting a
directive done by a service, no matter what it is.

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