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I want to create a named FIFO using systemd-tmpfiles as specified in the manual at tmpfiles.d | p,p+. I am able to create the fifo but the issue is with the user and group of that named fifo. Here is how I am defining it in conf file:

p+ /run/reboot 0644 system system - -

But the fifo is always created as root.root even if I specify it as system system in the conf file.

If I run the systemd-tmpfiles-setup.service script after bootup, then it the fifo is with system.system privileges. 

/bin/systemd-tmpfiles --create --remove --boot --exclude-prefix=/dev

So, either systemd-tmpfiles is creating it as root.root at bootup or some other service is changing permissions (not systemd-udev-trigger - tried masking this but no change).

For debug purpose, I ran this script (lsing) as ExecStartPort of systemd-tmpfiles-setup.service which does ls -la on /run and writes to /run/lsing.txt. Even there, I see the fifo is root.root,

ExecStartPost=/sbin/lsing

Need some help in debugging this issue. I am quite new to systemd.

jww
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Rckzz
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  • In the absence of a knowledgeable answerer, I'll try to help... What distro of linux is this? Is it possible that the user system and user root are both uid 0, or that user system doesn't exist? – Gus Jun 06 '19 at 20:50
  • There's also some references to `chown` by systemd-tmpfiles failing when /proc isn't mounted... so maybe that's something else to verify – Gus Jun 06 '19 at 20:52

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