PTY accessible by group membership inaccessible by symlink?

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I'm setting up a Linux application which interfaces with programs designed to talk to a serial port. What's strange is that while I can access the pty by symlink if I am the owner user (klipper), I can't if I'm not, even if the other user (octoprint) is in the pty's owning group.



For context, the symlink is at /tmp/printer and the pty is at /dev/pts/1.



$ ls -l /tmp/printer
lrwxrwxrwx 1 klipper klipper 10 Oct 19 21:30 /tmp/printer -> /dev/pts/1

$ ls -l /dev/pts/1
crw-rw---- 1 klipper tty 136, 1 Oct 19 22:41 /dev/pts/1

$ groups klipper
network tty uucp klipper

$ sudo -u octoprint picocom /tmp/printer
<...>
FATAL: cannot open /tmp/printer: Permission denied

$ sudo -u octoprint picocom /dev/pts/1
<...>
Terminal ready





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    I'm setting up a Linux application which interfaces with programs designed to talk to a serial port. What's strange is that while I can access the pty by symlink if I am the owner user (klipper), I can't if I'm not, even if the other user (octoprint) is in the pty's owning group.



    For context, the symlink is at /tmp/printer and the pty is at /dev/pts/1.



    $ ls -l /tmp/printer
    lrwxrwxrwx 1 klipper klipper 10 Oct 19 21:30 /tmp/printer -> /dev/pts/1

    $ ls -l /dev/pts/1
    crw-rw---- 1 klipper tty 136, 1 Oct 19 22:41 /dev/pts/1

    $ groups klipper
    network tty uucp klipper

    $ sudo -u octoprint picocom /tmp/printer
    <...>
    FATAL: cannot open /tmp/printer: Permission denied

    $ sudo -u octoprint picocom /dev/pts/1
    <...>
    Terminal ready





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      I'm setting up a Linux application which interfaces with programs designed to talk to a serial port. What's strange is that while I can access the pty by symlink if I am the owner user (klipper), I can't if I'm not, even if the other user (octoprint) is in the pty's owning group.



      For context, the symlink is at /tmp/printer and the pty is at /dev/pts/1.



      $ ls -l /tmp/printer
      lrwxrwxrwx 1 klipper klipper 10 Oct 19 21:30 /tmp/printer -> /dev/pts/1

      $ ls -l /dev/pts/1
      crw-rw---- 1 klipper tty 136, 1 Oct 19 22:41 /dev/pts/1

      $ groups klipper
      network tty uucp klipper

      $ sudo -u octoprint picocom /tmp/printer
      <...>
      FATAL: cannot open /tmp/printer: Permission denied

      $ sudo -u octoprint picocom /dev/pts/1
      <...>
      Terminal ready





      permissions symlink






      share













      I'm setting up a Linux application which interfaces with programs designed to talk to a serial port. What's strange is that while I can access the pty by symlink if I am the owner user (klipper), I can't if I'm not, even if the other user (octoprint) is in the pty's owning group.



      For context, the symlink is at /tmp/printer and the pty is at /dev/pts/1.



      $ ls -l /tmp/printer
      lrwxrwxrwx 1 klipper klipper 10 Oct 19 21:30 /tmp/printer -> /dev/pts/1

      $ ls -l /dev/pts/1
      crw-rw---- 1 klipper tty 136, 1 Oct 19 22:41 /dev/pts/1

      $ groups klipper
      network tty uucp klipper

      $ sudo -u octoprint picocom /tmp/printer
      <...>
      FATAL: cannot open /tmp/printer: Permission denied

      $ sudo -u octoprint picocom /dev/pts/1
      <...>
      Terminal ready





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