On 05/20/2016 02:59 PM, Lennart Poettering wrote:
On Fri, 20.05.16 14:01, Florian Weimer (fwei...@redhat.com) wrote:
The default systemd configuration runs ldconfig at boot. Why?
It's conditionalized via ConditionNeedsUpdate=, which means it is only
run when /etc is older than /usr. (This is tested via checking
modification times of /etc/.updated and /usr), see explanation on
systemd.unit(5).
The usecase for this is to permit systems where a single /usr tree is
shared among multiple systems, and might be updated at any time, and
the changes need to be propagated to /etc on each individual
systems. The keyword is "stateless systems".
Do such systems need systemd configuration changes?
Note that normally this should not be triggered at all, since this
only works on systems where /usr itsel is explicitly touched after
each updated so that the mtime is updated. That should normally not
happen, except when your distro is prepared for that, and does that
explicitly.
It happens if the filesystem package is upgraded. I think this is what
triggered the last mtime update on my workstation.
There are some more packages where installation or upgrades would update
the /usr mtime. I don't have a current Fedora rawhide list, but I'm
attaching an older version. The /usr mtime is not a reliable indicator
for what you are trying to detect, I think.
Florian
nevra | name
--------------------------------------------------------+-------------------------
arm-none-eabi-binutils-cs-2014.05.28-3.fc22.x86_64 | /usr/arm-none-eabi
arm-none-eabi-newlib-2.1.0-5.fc21.noarch | /usr/arm-none-eabi
avr-binutils-1:2.24-4.fc22.x86_64 | /usr/avr
avr-libc-1.8.0-9.fc21.noarch | /usr/avr
cinnamon-control-center-filesystem-2.4.2-1.fc22.i686 | /usr/share
cinnamon-control-center-filesystem-2.4.2-1.fc22.x86_64 | /usr/share
filesystem-3.2-32.fc22.x86_64 | /usr/bin
filesystem-3.2-32.fc22.x86_64 | /usr/games
filesystem-3.2-32.fc22.x86_64 | /usr/include
filesystem-3.2-32.fc22.x86_64 | /usr/lib
filesystem-3.2-32.fc22.x86_64 | /usr/lib64
filesystem-3.2-32.fc22.x86_64 | /usr/libexec
filesystem-3.2-32.fc22.x86_64 | /usr/local
filesystem-3.2-32.fc22.x86_64 | /usr/sbin
filesystem-3.2-32.fc22.x86_64 | /usr/share
filesystem-3.2-32.fc22.x86_64 | /usr/src
krb5-appl-clients-1.0.3-9.fc22.x86_64 | /usr/kerberos
krb5-appl-servers-1.0.3-9.fc22.x86_64 | /usr/kerberos
mingw32-filesystem-99-5.fc21.noarch | /usr/i686-w64-mingw32
mingw64-filesystem-99-5.fc21.noarch |
/usr/x86_64-w64-mingw32
msp430-binutils-2.21.1a-8.fc22.x86_64 | /usr/msp430
nqp-jvm-0.0.2014.04-3.fc22.noarch | /usr/languages
nqp-moar-0.0.2014.04-3.fc22.x86_64 | /usr/languages
sblim-cmpi-network-1.4.0-13.fc22.i686 | /usr/share
sblim-cmpi-network-1.4.0-13.fc22.x86_64 | /usr/share
(25 rows)
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