Public bug reported:
Example of problem:
The zimbra-mta package provides mail-transport-agent.
Packages that depend on mail-transport-agent are installed
(mailutils,logwatch).
apt-cache is unable to list either of those as depending on zimbra-mta:
root@zre-ldap004:/home/build# apt-cache rdepends --installed
mail-transport-agent
<mail-transport-agent>
aptitude does a little better:
root@zre-ldap004:/home/build# aptitude why zimbra-mta
iB mailutils Depends default-mta | mail-transport-agent
ip zimbra-mta Provides mail-transport-agent
so it finds mailutils (but not logwatch). so 50% better than apt-cache
If we try to remove zimbra-mta, we find:
root@zre-ldap004:/home/build# dpkg --purge zimbra-mta
dpkg: dependency problems prevent removal of zimbra-mta:
mailutils depends on default-mta | mail-transport-agent; however:
Package default-mta is not installed.
Package mail-transport-agent is not installed.
Package zimbra-mta which provides mail-transport-agent is to be removed.
logwatch depends on postfix | mail-transport-agent; however:
Package postfix is not installed.
Package mail-transport-agent is not installed.
Package zimbra-mta which provides mail-transport-agent is to be removed.
apt-cache kind of functions with postfix as the rdepends:
root@zre-ldap004:/home/build# apt-cache rdepends --installed postfix
postfix
Reverse Depends:
|logwatch
libsasl2-2
|cron
so we pick up logwatch in that case.
However, we *still* fail to find mailutils:
root@zre-ldap004:/home/build# apt-cache rdepends --installed default-mta
<default-mta>
So the rdepends flag for apt-cache seems to be completely broken for virtual
packages.
root@zre-ldap004:/home/build# apt-cache showpkg zimbra-mta
Package: zimbra-mta
Versions:
8.7.0.GA.1655.UBUNTU14.64 (/var/lib/dpkg/status)
Description Language:
File: /var/lib/dpkg/status
MD5: b25f6328eb0ffec1cb7bcd41cb0ddc9b
Reverse Depends:
Dependencies:
8.7.0.GA.1655.UBUNTU14.64 - zimbra-core (0 (null)) zimbra-mta-components (0
(null)) mail-transport-agent (0 (null)) mail-transport-agent:i386 (0 (null))
mail-transport-agent (0 (null)) mail-transport-agent:i386 (0 (null))
Provides:
8.7.0.GA.1655.UBUNTU14.64 - mail-transport-agent
Reverse Provides:
root@zre-ldap004:/home/build# apt-cache showpkg logwatch
Package: logwatch
Versions:
7.4.0+svn20130529rev144-1ubuntu1
(/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages)
(/var/lib/dpkg/status)
Description Language:
File:
/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages
MD5: ece539a8a87c5f861d7f0b865e42a03c
Description Language: en
File:
/var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_trusty_main_i18n_Translation-en
MD5: ece539a8a87c5f861d7f0b865e42a03c
Reverse Depends:
Dependencies:
7.4.0+svn20130529rev144-1ubuntu1 - perl (0 (null)) postfix (16 (null))
mail-transport-agent (0 (null)) fortune-mod (0 (null)) libdate-manip-perl (0
(null))
Provides:
7.4.0+svn20130529rev144-1ubuntu1 -
Reverse Provides:
root@zre-ldap004:/home/build# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.4 LTS"
root@zre-ldap004:/home/build# apt-cache policy apt
apt:
Installed: 1.0.1ubuntu2.14
Candidate: 1.0.1ubuntu2.14
Version table:
*** 1.0.1ubuntu2.14 0
500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64
Packages
100 /var/lib/dpkg/status
1.0.1ubuntu2.13 0
500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64
Packages
1.0.1ubuntu2 0
500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1616679
Title:
rdepends for apt-cache fails for virtual packages
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