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Re: Optimizing use of /var/cache/apt/archives/ by Synaptic &/or apt-get

On 01/24/2019 08:23 AM, David Wright wrote:
On Thu 24 Jan 2019 at 07:25:46 (-0600), Richard Owlett wrote:
On 01/23/2019 08:53 AM, Pascal Hambourg wrote:
Le 23/01/2019 à 15:43, Richard Owlett a écrit :

1. If /var/cache/apt/archives/ has the same or later version
version of a package, will Synaptic and apt-get automatically
use contents of /var/cache/apt/archives/ in preference to
downloading whatever is at location specified by sources.list?

Same version : yes. Later version : no.

2. If there is no internet connection at the moment, will
Synaptic and apt-get  use the latest version in
/var/cache/apt/archives/ ?

apt-get uses a version in the cache if and only if it matches the
requested version, regardless of the internet connectivity.

1) apt decides which version of a package it wants.
2) If that package version is present in the cache, it uses it.
3) Otherwise, it selects a mirror and downloads it from there.

I may have some re-thinking to do. Due to bandwidth I avoid downloads
whenever possible. Instead I purchase DVD sets. That's no real problem
for the machine whose purpose resembles a typical user's.

I have a couple of machines set aside for experimentation. They
explicitly have no connectivity to the outside world. My mental image
resembled using the cache contents as an local pseudo-repository. I
may have to create a real one.

I would take a look at apt-move

*THANK YOU* ! That does things I unsuccessfully attempted to do.

and apt-offline.

I had seen that before but had forgotten all about it ;{

Both look as though  they could be of help.


But don't forget that you can just stuff the cache, copying the files
from one /var/cache/apt/archives to another. Just remember to set
noclean wherever necessary.

I was thinking about that but wasn't sure it would work.

While you're reading   man dpkg, realise that dpkg can (and sometimes
must) install more than one package.


    -i, --install package-file...
            Install the package. If --recursive or -R option is specified,
            package-file must refer to a directory instead.

            Installation consists of the following steps:

            1. Extract the control files of the new package.


Back when dpkg was a more frequent topic of conversation here,
people would get tripped up by mutual dependencies (A depends
on B and vice versa) not realising that   dpkg -i A B   works.
Perhaps a sprinkling of (s) suffixes would improve the man page.