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Re: Upgrade from jessie to strech wants to bloat by system

On 2017-09-07 17:07 +0200, Urs Thuermann wrote:

> After fully updating my jessie system using
>         aptitude update; aptitude full-upgrade
> I edited sources.list to dist-upgrade to strech.  A folloing aptitude
> upgrade wants to install additional 1.5 GB on my system which is
> currently ~5 GB, i.e. a 30% increase:
>   # df -h / /usr
>   Filesystem      Size  Used Avail Use% Mounted on
>   /dev/dm-0       2.0G  1.8G  135M  93% /
>   /dev/dm-2       7.8G  4.4G  3.0G  60% /usr
>   # du -hs /root
>   1.4G    /root
>   # aptitude upgrade
>   Resolving dependencies...
>   ...
>   The following NEW packages will be installed:
>     btrfs-progs{a} clang-3.8{a} cpp-6{a} cpp-6-doc{a} dh-autoreconf{a}
>     ...
>   The following packages will be REMOVED:
>     cpp-4.9-doc{u} docutils-common{u} docutils-doc{u} g++-4.9{u} gir1.2-vte-2.90{u}
>     ...
>   The following packages will be upgraded:
>     acct acl acpi acpi-support-base acpid adduser adwaita-icon-theme apache2
>     ...
>   1151 packages upgraded, 297 newly installed, 128 to remove and 82 not upgraded.
>   Need to get 1843 MB of archives. After unpacking 1537 MB will be used.
>   Do you want to continue? [Y/n/?]
> I see that some new versions of packages are installed without the old
> versions being removed, although they are marked as automatically
> installed, e.g. Linux kernel, clang, llvm, and some others.  For
> example
>   # aptitude search "~i clang"
>   i   clang                     - C, C++ and Objective-C compiler (LLVM based)
>   i A clang-3.5                 - C, C++ and Objective-C compiler (LLVM based)
>   i A libclang-common-3.5-dev   - clang library - Common development package
>   i A libclang1-3.5             - C interface to the clang library
> and aptitude full-upgrade will install clang-3.8 but not remove
> clang-3.5.

This happens because clang-3.5 and gcc-4.9 provide the c-compiler
virtual package which is a dependency/recommendation of quite a few
packages (usually via an alternative: gcc | c-compiler).  Apt does not
autoremove such packages since they are not unused.  This was once
convincingly explained to me by aptitude's creator[1].

> But my suspicion is that even when I manually remove all
> these old packages, the installation is still unreasonably larger than
> it is currently.

Quite possibly.  The -Z and -D flags can help you to identify the
biggest offenders and why they are pulled in.


1. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=477166#16

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