Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: apparmor (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1435368
Title:
dh_apparmor does not assist postinst scripts that need to run the
constrained binary before the postinst completes
Status in apparmor package in Ubuntu:
Confirmed
Bug description:
This affects mysql-5.6.
mysql-server-5.6.postinst needs to run /usr/sbin/mysqld for
bootstrapping purposes before starting the daemon proper. It calls
dh_apparmor from dh_override_install in debian/rules.
The profile for mysqld has changed between 5.5 and 5.6: it now permits
read from /etc/mysql/**, since /etc/mysql/mysql.conf.d/ is now used in
addition to the original /etc/mysql/my.cnf, along with some other
files.
On upgrade from the previous 5.5 packaging, mysql-server-5.6.postinst
attempts to run /usr/sbin/mysqld which then fails because the old
profile is still active, since dh_apparmor has only added the snippet
to the end of the postinst (after this point). It appears to include
some logic about /etc/apparmor.d/local/ which I can't easily call from
earlier in the postinst instead.
Workaround: I added an extra apparmor_parser call when I need it. But
this fails if /etc/apparmor.d/local/usr.sbin.mysqld doesn't exist,
which is the case on first install of the package. So I have to ignore
errors. This isn't ideal though.
It would be better if we could somehow arrange dh_apparmor to ensure
that the apparmor profile is active earlier, or at least define some
way that the maintainer's postinst code can make it happen earlier -
for example by wrapping the logic into something the maintainer can
call. Or perhaps dh_apparmor should unload the profile in the prerm or
something, so that the postinst always runs without the profile loaded
(as already happens on first install).
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