The explicit /bin/systemd-tmpfiles is invoked in the postinst script for
systemd.
Interestingly, it's identical to systemd 229_4ubuntu16 postinst script,
so it was not introduced in 4ubuntu17.
I suspect this issue has been present for a while, but the daily run of
systemd-tmpfiles-clean job resto
I'm an idiot. Of course strace doesn't trace forks by default.
I did a full strace -f (including custom build of strace to stop
truncating arguments) and found more info.
The culprit seems to be /bin/systemd-tmpfiles
During install of the package this is called like so:
/bin/systemd-tmpfiles --
Xenial, sorry, ubuntu:x is lxd shortcut for xenial.
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https://bugs.launchpad.net/bugs/1687015
Title:
229_4ubuntu17 removes group write permissions from /var/l
Installing systemd 229_4ubuntu17 also installs the same version of
libsystemd0 and libpam-systemd, so possibly could be those packages, but
as noted, an strace of 'apt install systemd' didn't indictate anything.
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The source package: https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu17
and the diff:
http://launchpadlibrarian.net/306522149/systemd_229-4ubuntu16_229-4ubuntu17.diff.gz
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Public bug reported:
Steps to reproduce (time senstive, once lxd image is updated with
4ubuntu17, I expect this won't work)
lxc launch ubuntu:x test
lxc exec test -- ls -ld /var/log # shows 775 perms
lxc exec test -- apt update
lxc exec test -- apt-cache policy systemd
lxc exec test -- apt insta
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