a78413baae
pam_nologin looks for /etc/nologin and /run/nologin. user-sessions creates (and removes) /run/nologin, but also removes /etc/nologin. (This behaviour is unchanged since the introduction of the binary in e92787416c691c3f34f47349e5eae3fa68eae856.) By not removing pam_nologin we fully drop compatibility with PAM < 1.1. This has the advantage that now /etc/nologin can be used by administrator to disable user logins, e.g. for extended maintanance. We already specified PAM >= 1.1.2 as dependency, so this was already covered. The makes the code match the man page. Fixes #26965.
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