From [email protected] Mon Oct  5 07:35:36 2009
Path: diesel.cu.mi.it!newerode.bofh.it!news.nic.it!robomod
From: Andrew Sackville-West <[email protected]>
Newsgroups: linux.debian.user
Subject: Re: Installing app list on a new dist
Date: Mon, 05 Oct 2009 02:10:05 +0200
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On Sun, Oct 04, 2009 at 12:40:57PM -0700, Bill wrote:
> Hi folks,
>=20
> About a month ago there was a thread entitled "Installed list of
> Apps" concerning the right way to duplicate installed apps on one
> box to another.=20
>=20
> Johan Gronquist suggested:
> dpkg --get-selections
> dpkg --set-selections
> http://ubuntuforums.org/showthread.php?t=3D169062

this method will give every installed package
>=20
> Oumar Niane suggested:
> $ aptitude -F "%p" search '~i!~M' > package_list
> $ aptitude install < package_list
> and pointed out that:
> With [the other] method, you loose the flag for packages that=20
> were automatically installed.

this method gives only manually installed packages. automatically
installed packages will be brought in, well, automatically.

>=20
> OK so my situation is somewhat different. I wish to install=20
> the packages from a sarge install to a fresh install of lenny
> and keep the list of installed packages more or less the same.
> If lenny upgrades the package then I'd prefer to use the newer
> version rather than install an older version. I don't want to=20
> "loose" all the extra packages I've installed on sarge by moving=20
> to a fresh install.
>=20
> So in testing the two methods, the dpkg list is 1923 lines long
> including 73 "deinstalled" lines, whereas the aptitude method is=20
> 1276 lines long.=20

this makes sense. only a subset of installed packages were explicitly
installed. the others were brought in automatically.

>=20
> So I have two questions:
> 1. Why is there such a substantial discrepancy between the two
> methods and which method would be preferable?

hopefully that is already clear from the above.

> 2. What about discrepancies between versions? Many lines include
> a version number. Will I wind up with older package versions or=20
> will it be upgraded to the lenny version? How can I get around
> that if necessary?

I think to make this work you'd want to manually go over the
list. Jumping two versions like that will leave you trying to install
packages that just don't exist anymore.=20

definitely, whichever method you use, I would remove any packages that
start with lib, and review the whole thing manually. Also, spend some
time decrufting the system before producing the lists. deborphan is
your friend here.=20

in the end, there may not really be any good way to do this
automatically unless you want to script up something to parse the list
and check against the apt-cache to see if they exist, throwing out the
ones that fail.'

hth

A

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