On production machine which most probably using php5-fpm + event or worker
Apache2 MPM, this bug forcefully reinstall libapache2-mod-php5 after
(unattended = minor) PHP5 update.
The direct effect of this is reinstalling mpm_prefork !
Simply stated: unattended-upgrades breaks LAMP installation by not resolving
dependencies correctly.
Could maintainer have a look on this please?
I've been hit every time php5 package is updated.
Current workaround:
```
Package: libapache2-mod-php5 libapache2-mod-php5filter
Pin: origin ""
Pin-Priority: -1
```
Note: may add php5-cgi, since the auto-installation of this package is not as
disastrous.
Note: it's hard to *debug* this bug (unless setting XUUPOPT="-d" inside
/etc/cron.daily/apt) and may well be left unnoticed in some case... until
website traffic increases implying the prefork MPM extra-load.
Side question: why would unattended-upgrades provide its own (not-apt-based)
resolution mechanism in the first place?
** Attachment added: "sample debug unattended-upgrade php5 log"
https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1434115/+attachment/4759001/+files/auto-upgrade.log
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https://bugs.launchpad.net/bugs/1434115
Title:
apparently broken dependency resolution
Status in unattended-upgrades package in Ubuntu:
Confirmed
Bug description:
It looks as though unattended upgrades' dependency resolution is a
little broken when there are multiple alternatives and when the
dependency is currently satisfied by a package other than the first
alternative.
In this case, package php5 was upgraded. php5 depends:
$ dpkg -s php5|grep Depends
Depends: libapache2-mod-php5 (>= 5.5.9+dfsg-1ubuntu4.7) |
libapache2-mod-php5filter (>= 5.5.9+dfsg-1ubuntu4.7) | php5-cgi (>=
5.5.9+dfsg-1ubuntu4.7) | php5-fpm (>= 5.5.9+dfsg-1ubuntu4.7), php5-common (>=
5.5.9+dfsg-1ubuntu4.7)
I use php5-fpm, and specifically do not want libapache2-mod-php5
installed (not least because it breaks my FPM config). After manually
purging libapache2-mod-php5:
$ dpkg -l $(dpkg -s php5|grep Depends|perl -npe 's/Depends://;
s/[,|]/\n/g'|cut -f 2 -d\ )|grep ^[a-z]
un libapache2-mod-php5 <none>
<none> (no description available)
un libapache2-mod-php5filter <none>
<none> (no description available)
un php5-cgi <none>
<none> (no description available)
ii php5-common 5.5.9+dfsg-1ubuntu4.7
amd64 Common files for packages built from the php5 source
ii php5-fpm 5.5.9+dfsg-1ubuntu4.7
amd64 server-side, HTML-embedded scripting language (FPM-CGI
binary)
note that:
• php5-fpm is installed and therefore that dependency of php5 was already
satisfied
• php5-cgi and libapache2-mod-php5filter are alternative dependencies along
with libapache2-mod-php5, yet neither got installed in the way that
libapache2-mod-php5 did.
For completeness' sake, here's an excerpt of the unattended upgrade log (full
log attached) showing that it was this morning's upgrade run that installed
libapache2-mod-php5:
Selecting previously unselected package libapache2-mod-php5.
Preparing to unpack .../libapache2-mod-php5_5.5.9+dfsg-1ubuntu4.7_amd64.deb
...
Unpacking libapache2-mod-php5 (5.5.9+dfsg-1ubuntu4.7) ...
Preparing to unpack .../php5_5.5.9+dfsg-1ubuntu4.7_all.deb ...
Unpacking php5 (5.5.9+dfsg-1ubuntu4.7) over (5.5.9+dfsg-1ubuntu4.6) ...
Other requested information:
$ lsb_release -rd
Description: Ubuntu 14.04.2 LTS
Release: 14.04
$ apt-cache policy unattended-upgrades
unattended-upgrades:
Installed: 0.82.1ubuntu2.1
Candidate: 0.82.1ubuntu2.1
Version table:
*** 0.82.1ubuntu2.1 0
500 http://ubuntu.orion.retrosnub.co.uk/ubuntu/ trusty-updates/main
amd64 Packages
100 /var/lib/dpkg/status
0.82.1ubuntu2 0
500 http://ubuntu.orion.retrosnub.co.uk/ubuntu/ trusty/main amd64
Packages
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