** Changed in: dpkg (Ubuntu Trusty)
Assignee: Néstor O. Gozza (mangosta11) => (unassigned)
** Changed in: dpkg (Ubuntu Xenial)
Assignee: Reinhardt Pflanz (sajaha-e) => (unassigned)
** Changed in: dpkg (Ubuntu Yakkety)
Status: Confirmed => Invalid
** Changed in: snapd (Ubuntu Yakkety)
Status: Confirmed => Invalid
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1673247
Title:
package snapd 2.23.1 failed to install/upgrade: trying to overwrite
'/etc/apparmor.d/usr.lib.snapd.snap-confine', which is also in package
snap-confine 2.23.1
Status in dpkg package in Ubuntu:
In Progress
Status in snapd package in Ubuntu:
In Progress
Status in dpkg source package in Trusty:
Confirmed
Status in snapd source package in Trusty:
In Progress
Status in dpkg source package in Xenial:
Confirmed
Status in snapd source package in Xenial:
Confirmed
Status in dpkg source package in Yakkety:
Invalid
Status in snapd source package in Yakkety:
Invalid
Status in dpkg source package in Zesty:
Confirmed
Status in snapd source package in Zesty:
Confirmed
Bug description:
When the ubuntu installer runs it has an option to download updates during
the install. When this happens snapd/snap-confine 2.22.6 are installed on
/target. The upgrade brings in snapd/snap-confine 2.23.1 which has a conffile
in /etc/apparmor.d/usr.lib.snapd.snap-confine. The snapd packages declares a
breaks/replaces: snapd-confine (<< 2.23) which works correctly on regular
upgrades. However it does fail on upgrades with the "--root=/target" that is
used by ubiquity. After a bit of debugging it turns out the reason is that
src/archives.c:tarobject() has a check for obsolete conffiles in the block
around "Is the file an obsolete conffile ...". There is a stat() here that
checks that the conff->name and the fnamevb are the same file. This check
fails to take the instdir into account and therefore the loop does not
continue but falls through to the "does_replace()" checks.
--------------------------------------------
Snap 2.23.1 fails to upgrade from 2.21.
Known facts:
- reporters (and apport) indicate it fails during the install via the live-cd
- not reproducible so far on an already installed system
- breaks/replaces of snapd are correct
- When adding "xenial-proposed" to apt-setup in ubiquity and installing
Cause:
- when ubiquity runs it uses "dpkg --root=/target --unpack ..." - however
when doing the conffile checking dpkg does not handle the "--root" parameter
correctly and checks something against "/" instead of "/target".
---------------------------------------------
I really don't know what else to add...
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: snapd 2.23.1
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CasperVersion: 1.376.2
Date: Wed Mar 15 16:03:33 2017
DuplicateSignature:
package:snapd:2.23.1
Unpacking snapd (2.23.1) over (2.21) ...
dpkg: error processing archive
/target/var/cache/apt/archives/snapd_2.23.1_amd64.deb (--unpack):
trying to overwrite '/etc/apparmor.d/usr.lib.snapd.snap-confine', which is
also in package snap-confine 2.23.1
ErrorMessage: trying to overwrite
'/etc/apparmor.d/usr.lib.snapd.snap-confine', which is also in package
snap-confine 2.23.1
LiveMediaBuild: Ubuntu-GNOME 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215)
RelatedPackageVersions:
dpkg 1.18.4ubuntu1.1
apt 1.2.19
SourcePackage: snapd
Title: package snapd 2.23.1 failed to install/upgrade: trying to overwrite
'/etc/apparmor.d/usr.lib.snapd.snap-confine', which is also in package
snap-confine 2.23.1
UpgradeStatus: No upgrade log present (probably fresh install)
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