Ok, now that I've finally figured out how exactly lightdm works in this
regard, I've pushed my changes to lp:~lotheac/lightdm/utmpx.
At first, I was trying to check for XDG_SESSION_CLASS_USER, but it seems
that is never set. The authentication session (which talks to the
greeter) has no class, and that same session is used to start the
user's process (hence it needs PAM very much). If authentication fails,
the authentication session is restarted. I just check if we're a greeter
after authentication, and if so, skip pam_{open,close}_session and write
the utmpx entry.
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https://bugs.launchpad.net/bugs/870297
Title:
Lightdm logins not being logged in wtmp
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