Debian Bug report logs - #919543
apt: when installing with deb file, prerm maintainer script doesn't pass new-package-name before it's replaced due to conflict

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Message #5 received at [email protected] (full text, mbox, reply):

From: Allen <[email protected]>

To: Debian Bug Tracking System <[email protected]>

Subject: apt: when installing with deb file, prerm maintainer script doesn't pass new-package-name before it's replaced due to conflict

Date: Thu, 17 Jan 2019 11:03:01 +0800

Package: apt
Version: 1.2.19
Severity: normal

Dear Maintainer,


I am creating a deb packages which will replace another package. And before the
old package are removed, I want to check whether the package is remove due to
**replace** operation or a simple **uninstall** operation.

In man page of `deb-prerm`, I found that when a package is replaced due to
conflict, the prerm script of old package can be called in the following way:
`prerm remove in-favour new-package new-version`.

Therefore, I add some script in prerm of old package and opreate with the shell
script variables. If I use `dpkg` to install these .deb packages, it will work
perfectly. However, it does not pass any new package information if I use `apt`
to install these packages.

Is it an existing bug? I have searched for a while and have not found any
relevant content.


Many thanks,
Allen Yang



-- Package-specific info:

-- apt-config dump --

APT "";
APT::Architecture "amd64";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Install-Recommends "1";
APT::Install-Suggests "0";
APT::Sandbox "";
APT::Sandbox::User "_apt";
APT::Authentication "";
APT::Authentication::TrustCDROM "true";
APT::NeverAutoRemove "";
APT::NeverAutoRemove:: "^firmware-linux.*";
APT::NeverAutoRemove:: "^linux-firmware$";
APT::NeverAutoRemove:: "^linux-image-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^linux-image-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^linux-headers-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^linux-headers-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^gnumach-image-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^gnumach-image-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^.*-modules-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^.*-modules-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^.*-kernel-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^.*-kernel-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.15\.0-43-generic$";
APT::NeverAutoRemove:: "^linux-tools-4\.15\.0-42-generic$";
APT::NeverAutoRemove:: "^linux-tools-4\.15\.0-43-generic$";
APT::VersionedKernelPackages "";
APT::VersionedKernelPackages:: "linux-image";
APT::VersionedKernelPackages:: "linux-headers";
APT::VersionedKernelPackages:: "linux-image-extra";
APT::VersionedKernelPackages:: "linux-signed-image";
APT::VersionedKernelPackages:: "kfreebsd-image";
APT::VersionedKernelPackages:: "kfreebsd-headers";
APT::VersionedKernelPackages:: "gnumach-image";
APT::VersionedKernelPackages:: ".*-modules";
APT::VersionedKernelPackages:: ".*-kernel";
APT::VersionedKernelPackages:: "linux-backports-modules-.*";
APT::VersionedKernelPackages:: "linux-tools";
APT::Never-MarkAuto-Sections "";
APT::Never-MarkAuto-Sections:: "metapackages";
APT::Never-MarkAuto-Sections:: "contrib/metapackages";
APT::Never-MarkAuto-Sections:: "non-free/metapackages";
APT::Never-MarkAuto-Sections:: "restricted/metapackages";
APT::Never-MarkAuto-Sections:: "universe/metapackages";
APT::Never-MarkAuto-Sections:: "multiverse/metapackages";
APT::Move-Autobit-Sections "";
APT::Move-Autobit-Sections:: "oldlibs";
APT::Move-Autobit-Sections:: "contrib/oldlibs";
APT::Move-Autobit-Sections:: "non-free/oldlibs";
APT::Move-Autobit-Sections:: "restricted/oldlibs";
APT::Move-Autobit-Sections:: "universe/oldlibs";
APT::Move-Autobit-Sections:: "multiverse/oldlibs";
APT::Periodic "";
APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "1";
APT::Update "";
APT::Update::Post-Invoke-Success "";
APT::Update::Post-Invoke-Success:: "touch /var/lib/apt/periodic/update-success-stamp 2>/dev/null || true";
APT::Update::Post-Invoke-Success:: "[ ! -f /var/run/dbus/system_bus_socket ] || /usr/bin/dbus-send --system --dest=org.debian.apt --type=signal /org/debian/apt org.debian.apt.CacheChanged || true";
APT::Update::Post-Invoke-Success:: "if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh > /dev/null; fi";
APT::Update::Post-Invoke-Success:: "/usr/lib/update-notifier/update-motd-updates-available 2>/dev/null || true";
APT::Archives "";
APT::Archives::MaxAge "30";
APT::Archives::MinAge "2";
APT::Archives::MaxSize "500";
APT::Architectures "";
APT::Architectures:: "amd64";
APT::Architectures:: "i386";
APT::Compressor "";
APT::Compressor::. "";
APT::Compressor::.::Name ".";
APT::Compressor::.::Extension "";
APT::Compressor::.::Binary "";
APT::Compressor::.::Cost "0";
APT::Compressor::lz4 "";
APT::Compressor::lz4::Name "lz4";
APT::Compressor::lz4::Extension ".lz4";
APT::Compressor::lz4::Binary "false";
APT::Compressor::lz4::Cost "50";
APT::Compressor::gzip "";
APT::Compressor::gzip::Name "gzip";
APT::Compressor::gzip::Extension ".gz";
APT::Compressor::gzip::Binary "gzip";
APT::Compressor::gzip::Cost "100";
APT::Compressor::gzip::CompressArg "";
APT::Compressor::gzip::CompressArg:: "-6n";
APT::Compressor::gzip::UncompressArg "";
APT::Compressor::gzip::UncompressArg:: "-d";
APT::Compressor::xz "";
APT::Compressor::xz::Name "xz";
APT::Compressor::xz::Extension ".xz";
APT::Compressor::xz::Binary "xz";
APT::Compressor::xz::Cost "200";
APT::Compressor::xz::CompressArg "";
APT::Compressor::xz::CompressArg:: "-6";
APT::Compressor::xz::UncompressArg "";
APT::Compressor::xz::UncompressArg:: "-d";
APT::Compressor::bzip2 "";
APT::Compressor::bzip2::Name "bzip2";
APT::Compressor::bzip2::Extension ".bz2";
APT::Compressor::bzip2::Binary "bzip2";
APT::Compressor::bzip2::Cost "300";
APT::Compressor::bzip2::CompressArg "";
APT::Compressor::bzip2::CompressArg:: "-6";
APT::Compressor::bzip2::UncompressArg "";
APT::Compressor::bzip2::UncompressArg:: "-d";
APT::Compressor::lzma "";
APT::Compressor::lzma::Name "lzma";
APT::Compressor::lzma::Extension ".lzma";
APT::Compressor::lzma::Binary "xz";
APT::Compressor::lzma::Cost "400";
APT::Compressor::lzma::CompressArg "";
APT::Compressor::lzma::CompressArg:: "--format=lzma";
APT::Compressor::lzma::CompressArg:: "-6";
APT::Compressor::lzma::UncompressArg "";
APT::Compressor::lzma::UncompressArg:: "--format=lzma";
APT::Compressor::lzma::UncompressArg:: "-d";
Dir "/";
Dir::State "var/lib/apt/";
Dir::State::lists "lists/";
Dir::State::cdroms "cdroms.list";
Dir::State::mirrors "mirrors/";
Dir::State::extended_states "extended_states";
Dir::State::status "/var/lib/dpkg/status";
Dir::Cache "var/cache/apt/";
Dir::Cache::archives "archives/";
Dir::Cache::srcpkgcache "srcpkgcache.bin";
Dir::Cache::pkgcache "pkgcache.bin";
Dir::Etc "etc/apt/";
Dir::Etc::sourcelist "sources.list";
Dir::Etc::sourceparts "sources.list.d";
Dir::Etc::main "apt.conf";
Dir::Etc::netrc "auth.conf";
Dir::Etc::parts "apt.conf.d";
Dir::Etc::preferences "preferences";
Dir::Etc::preferencesparts "preferences.d";
Dir::Etc::trusted "trusted.gpg";
Dir::Etc::trustedparts "trusted.gpg.d";
Dir::Bin "";
Dir::Bin::methods "/usr/lib/apt/methods";
Dir::Bin::solvers "";
Dir::Bin::solvers:: "/usr/lib/apt/solvers";
Dir::Bin::dpkg "/usr/bin/dpkg";
Dir::Bin::bzip2 "/bin/bzip2";
Dir::Bin::xz "/usr/bin/xz";
Dir::Bin::lz4 "/usr/bin/lz4";
Dir::Bin::lzma "/usr/bin/xz";
Dir::Media "";
Dir::Media::MountPath "/media/apt";
Dir::Log "var/log/apt";
Dir::Log::Terminal "term.log";
Dir::Log::History "history.log";
Dir::Ignore-Files-Silently "";
Dir::Ignore-Files-Silently:: "~$";
Dir::Ignore-Files-Silently:: "\.disabled$";
Dir::Ignore-Files-Silently:: "\.bak$";
Dir::Ignore-Files-Silently:: "\.dpkg-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.save$";
Dir::Ignore-Files-Silently:: "\.orig$";
Dir::Ignore-Files-Silently:: "\.distUpgrade$";
Acquire "";
Acquire::AllowInsecureRepositories "1";
Acquire::AllowDowngradeToInsecureRepositories "0";
Acquire::cdrom "";
Acquire::cdrom::mount "/media/cdrom/";
Acquire::IndexTargets "";
Acquire::IndexTargets::deb "";
Acquire::IndexTargets::deb::Packages "";
Acquire::IndexTargets::deb::Packages::MetaKey "$(COMPONENT)/binary-$(ARCHITECTURE)/Packages";
Acquire::IndexTargets::deb::Packages::flatMetaKey "Packages";
Acquire::IndexTargets::deb::Packages::ShortDescription "Packages";
Acquire::IndexTargets::deb::Packages::Description "$(RELEASE)/$(COMPONENT) $(ARCHITECTURE) Packages";
Acquire::IndexTargets::deb::Packages::flatDescription "$(RELEASE) Packages";
Acquire::IndexTargets::deb::Packages::Optional "0";
Acquire::IndexTargets::deb::Translations "";
Acquire::IndexTargets::deb::Translations::MetaKey "$(COMPONENT)/i18n/Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::flatMetaKey "$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::ShortDescription "Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::Description "$(RELEASE)/$(COMPONENT) Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::flatDescription "$(RELEASE) Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::DEP-11 "";
Acquire::IndexTargets::deb::DEP-11::MetaKey "$(COMPONENT)/dep11/Components-$(NATIVE_ARCHITECTURE).yml";
Acquire::IndexTargets::deb::DEP-11::ShortDescription "Components-$(NATIVE_ARCHITECTURE)";
Acquire::IndexTargets::deb::DEP-11::Description "$(RELEASE)/$(COMPONENT) $(NATIVE_ARCHITECTURE) DEP-11 Metadata";
Acquire::IndexTargets::deb::DEP-11::KeepCompressed "true";
Acquire::IndexTargets::deb::DEP-11::KeepCompressedAs "gz";
Acquire::IndexTargets::deb::DEP-11-icons "";
Acquire::IndexTargets::deb::DEP-11-icons::MetaKey "$(COMPONENT)/dep11/icons-64x64.tar";
Acquire::IndexTargets::deb::DEP-11-icons::ShortDescription "icons-64x64";
Acquire::IndexTargets::deb::DEP-11-icons::Description "$(RELEASE)/$(COMPONENT) DEP-11 64x64 Icons";
Acquire::IndexTargets::deb::DEP-11-icons::KeepCompressed "true";
Acquire::IndexTargets::deb::DEP-11-icons::KeepCompressedAs "gz";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi "";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi::MetaKey "$(COMPONENT)/dep11/icons-128x128.tar";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi::ShortDescription "icons-128x128";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi::Description "$(RELEASE)/$(COMPONENT) DEP-11 128x128 Icons";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi::KeepCompressed "true";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi::KeepCompressedAs "gz";
Acquire::IndexTargets::deb::DEP-11-icons-hidpi::DefaultEnabled "false";
Acquire::IndexTargets::deb-src "";
Acquire::IndexTargets::deb-src::Sources "";
Acquire::IndexTargets::deb-src::Sources::MetaKey "$(COMPONENT)/source/Sources";
Acquire::IndexTargets::deb-src::Sources::flatMetaKey "Sources";
Acquire::IndexTargets::deb-src::Sources::ShortDescription "Sources";
Acquire::IndexTargets::deb-src::Sources::Description "$(RELEASE)/$(COMPONENT) Sources";
Acquire::IndexTargets::deb-src::Sources::flatDescription "$(RELEASE) Sources";
Acquire::IndexTargets::deb-src::Sources::Optional "0";
Acquire::Changelogs "";
Acquire::Changelogs::URI "";
Acquire::Changelogs::URI::Origin "";
Acquire::Changelogs::URI::Origin::Debian "http://metadata.ftp-master.debian.org/changelogs/@CHANGEPATH@_changelog";
Acquire::Changelogs::URI::Origin::Tanglu "http://metadata.tanglu.org/changelogs/@CHANGEPATH@_changelog";
Acquire::Changelogs::URI::Origin::Ubuntu "http://changelogs.ubuntu.com/changelogs/pool/@CHANGEPATH@/changelog";
Acquire::Changelogs::URI::Origin::Ultimedia "http://packages.ultimediaos.com/changelogs/pool/@CHANGEPATH@/changelog.txt";
Acquire::Changelogs::AlwaysOnline "true";
Acquire::Changelogs::AlwaysOnline::Origin "";
Acquire::Changelogs::AlwaysOnline::Origin::Ubuntu "1";
Acquire::Languages "";
Acquire::Languages:: "en";
Acquire::Languages:: "none";
Aptitude "";
Aptitude::Get-Root-Command "sudo:/usr/bin/sudo";
Unattended-Upgrade "";
Unattended-Upgrade::Allowed-Origins "";
Unattended-Upgrade::Allowed-Origins:: "${distro_id}:${distro_codename}";
Unattended-Upgrade::Allowed-Origins:: "${distro_id}:${distro_codename}-security";
DPkg "";
DPkg::Pre-Install-Pkgs "";
DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
DPkg::Post-Invoke "";
DPkg::Post-Invoke:: "if [ -d /var/lib/update-notifier ]; then touch /var/lib/update-notifier/dpkg-run-stamp; fi; /usr/lib/update-notifier/update-motd-updates-available 2>/dev/null || true";
Binary "apt-config";
Binary::apt "";
Binary::apt::APT "";
Binary::apt::APT::Color "1";
Binary::apt::APT::Cache "";
Binary::apt::APT::Cache::Show "";
Binary::apt::APT::Cache::Show::Version "2";
Binary::apt::APT::Cache::AllVersions "0";
Binary::apt::APT::Cache::ShowVirtuals "1";
Binary::apt::APT::Cache::Search "";
Binary::apt::APT::Cache::Search::Version "2";
Binary::apt::APT::Cache::ShowDependencyType "1";
Binary::apt::APT::Cache::ShowVersion "1";
Binary::apt::APT::Get "";
Binary::apt::APT::Get::Upgrade-Allow-New "1";
Binary::apt::APT::Cmd "";
Binary::apt::APT::Cmd::Show-Update-Stats "1";
Binary::apt::APT::Keep-Downloaded-Packages "0";
Binary::apt::DPkg "";
Binary::apt::DPkg::Progress-Fancy "1";
Binary::apt::Acquire "";
Binary::apt::Acquire::AllowInsecureRepositories "0";
CommandLine "";
CommandLine::AsString "apt-config dump";

-- (no /etc/apt/preferences present) --


-- /etc/apt/sources.list --

# deb cdrom:[Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2)]/ xenial main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://tw.archive.ubuntu.com/ubuntu/ xenial main restricted
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial main restricted

## Major bug fix updates produced after the final release of the
## distribution.
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://tw.archive.ubuntu.com/ubuntu/ xenial universe
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial universe
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://tw.archive.ubuntu.com/ubuntu/ xenial multiverse
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial multiverse
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb-src http://tw.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu xenial partner
# deb-src http://archive.canonical.com/ubuntu xenial partner

# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
deb http://tw.archive.ubuntu.com/ubuntu/ xenial-backports main universe multiverse restricted
deb http://tw.archive.ubuntu.com/ubuntu/ xenial-updates main universe multiverse restricted
deb http://security.ubuntu.com/ubuntu/ xenial-security main universe multiverse restricted

-- System Information:
Debian Release: stretch/sid
  APT prefers xenial-updates
  APT policy: (500, 'xenial-updates'), (500, 'xenial-security'), (500, 'xenial'), (100, 'xenial-backports')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.15.0-42-generic (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages apt depends on:
ii  adduser              3.113+nmu3ubuntu4
ii  gnupg                1.4.20-1ubuntu3.3
ii  gnupg2               2.1.11-6ubuntu2.1
ii  gpgv                 1.4.20-1ubuntu3.3
ii  init-system-helpers  1.29ubuntu3
ii  libapt-pkg5.0        1.2.19
ii  libc6                2.23-0ubuntu10
ii  libgcc1              1:6.0.1-0ubuntu1
ii  libstdc++6           5.4.0-6ubuntu1~16.04.10
ii  ubuntu-keyring       2012.05.19

apt recommends no packages.

Versions of packages apt suggests:
pn  apt-doc                      <none>
pn  aptitude | synaptic | wajig  <none>
ii  dpkg-dev                     1.18.4ubuntu1.1
ii  python-apt                   1.1.0~beta1ubuntu0.16.04.2

-- no debconf information

Message #10 received at [email protected] (full text, mbox, reply):

From: Julian Andres Klode <[email protected]>

To: Allen <[email protected]>, [email protected]

Cc: [email protected], [email protected]

Subject: Re: Bug#919543: apt: when installing with deb file, prerm maintainer script doesn't pass new-package-name before it's replaced due to conflict

Date: Thu, 17 Jan 2019 10:11:35 +0100

On Thu, Jan 17, 2019 at 11:03:01AM +0800, Allen wrote:
> Package: apt
> Version: 1.2.19
> Severity: normal
> 
> Dear Maintainer,
> 
> 
> I am creating a deb packages which will replace another package. And before the
> old package are removed, I want to check whether the package is remove due to
> **replace** operation or a simple **uninstall** operation.
> 
> In man page of `deb-prerm`, I found that when a package is replaced due to
> conflict, the prerm script of old package can be called in the following way:
> `prerm remove in-favour new-package new-version`.
> 
> Therefore, I add some script in prerm of old package and opreate with the shell
> script variables. If I use `dpkg` to install these .deb packages, it will work
> perfectly. However, it does not pass any new package information if I use `apt`
> to install these packages.
> 
> Is it an existing bug? I have searched for a while and have not found any
> relevant content.

So, I don't think this ever worked. It's best to ignore this exists. While it
is documented, it cannot really happen in practice, as apt first does the remove
and then the install; in two separate invocations of dpkg.

It's unlikely that this will change in the near future, either.

It's also completely unreliable in case you have multiple conflicts across
packages, so I think we should just get rid of it completely.

-- 
debian developer - deb.li/jak | jak-linux.org - free software dev
ubuntu core developer                              i speak de, en

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