snapping tmux

[Joe Coates]

I've been trying to add tmux to my snap to provide separate command line environments to each of several processes in the snap (the target is Ubuntu-core).   It builds OK but it fails silently upon execution (by silent I mean no appArmor denials or error messages in journalctl or syslog).  The tmux log indicates "fatal: tcgetattr failed: Bad file descriptor", and I believe it is trying to access the session TTY ("client 0x10e9590 IDENTIFY_ENVIRON SSH_TTY=/dev/pts/1") .     This behavior is consistent on ubuntu-core, core+classic, and ubuntu server.
 Before delving further into tmux code I'd like to know if there is some basic restriction preventing this from working - is the console session off limits to snaps ?     I noticed some early attempts at snapping tmux on github, but none of them seem to have been successful.  Has anyone tried this, or can perhaps offer any advice ?
Thanks,
Joe Coates

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