Re: An INCOMPLETE solution - was [Re: Where is data stored when Synaptic scans DVDs?]
On Thu 23 Mar 2017 at 10:12:57 +0000, Darac Marjal wrote:
> On Wed, Mar 22, 2017 at 08:08:28PM -0500, Richard Owlett wrote:
> >On 03/17/2017 08:47 AM, Richard Owlett wrote:
> >>As I have limited bandwidth, I install from DVDs.
> >>Also I frequently experiment with various options by doing a fresh
> >>install to a different partition.
> >>It is annoying to keep re-scanning a set of 13 DVDs.
> >>Where is the information stored?
> >>/etc/apt/sources.list is obvious, but where is the data about contents
> >>of each DVD stored?
> >>TIA
> >
> >It had been suggested that all the needed information might be in
> >/etc/apt/sources.list
> > PLUS
> >the /var/lib/apt directory
> >
> >It ain't :{
>
> Looking at the source, apt-cdrom does a bunch of checks and then calls into
> pkgCdrom::Add()[1]. That does some more checks and then the interesting
> stuff seems to start around line 746.
>
> The Configuration Database (TODO: Find where this is stored... Ah, I *think*
> that's the /var/lib/apt/cdroms.list mentioned earlier) is checked for
> existance of the CD and updated, if necessary. The next interesting part is
> at line 838 where the packages are copied. This seems to happen in
> IndexCopy::CopyPackages()[2] which, at line 97, creates a file in
> /var/cache/apt/archives/partial/ containing the contents of the cdrom.
>
> [1] http://sources.debian.net/src/apt/1.4~rc2/apt-pkg/cdrom.cc/
> [2] http://sources.debian.net/src/apt/1.4~rc2/apt-pkg/indexcopy.cc/
>
>
> So, in summary, I think you need /etc/apt/sources.list, /var/lib/apt *AND*
> /var/cache/apt/archives.
Suppose /var/cache/apt/archives is empty because 'apt-get clean' has
been run. What then?
--
Brian.
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