[HEADS UP] fprintd-pam update vs "authconfig --update"

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Hi,

Please be careful with fprintd-pam update. It might happen that you
might not be able to log in to your computer anymore as it happened to me.


The story is approximately as follows:

1) You install your computer.

2) You install SSSD, configure it and live happy ever after.

3) But there is some new functionality and new default in authconfig
introduced [1], but the computer keeps working, because the
configuration is not applied.

4) Then there is discovered, that if fprintd-pam is removed, there is
some harmless error reported in logs and there is fix applied [2].

5) As it turns out, the fingerprint reader is actually unregistered by
every update, since there is bug in the scriptlet [3]. This is fixed but
it triggers the update and PAM configuration update.

6) Since the PAM configuration was updated, the new default from (3) is
applied and therefore I cannot login anymore.


I believe, that the "authconfig --update" should not be called
automatically during update and no other package does that as far as I
can tell. Therefore, I reported this into BZ [4], but since I am not PAM
expert, any comments are welcome.


Vít



[1] https://bugzilla.redhat.com/show_bug.cgi?id=1195817
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1203671
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1398371
[4] https://bugzilla.redhat.com/show_bug.cgi?id=1423480



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