106 lines
4.2 KiB
Text
106 lines
4.2 KiB
Text
Installation method for multiple binary media
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---------------------------------------------
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This directory contains a method to be used within dselect in order to
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access Debian binary packages stored across multiple binary media
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(CDs, DVDs, BDs, or USBs).
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Acquiring package data
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---------------------
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It is possible to access the following binary directories within
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«dists/stable»:
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. main
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. contrib
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. non-free-firmware
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. non-free
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. local
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The selected method will try to read the «Packages.cd» file from each
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of these directories if it is available.
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Identifying the media
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----------------------
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A unique name is associated to each media disc. This name should correspond
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with the label on the front of the media disc. The name is also available on
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the media disc, so the system can find out which media disc is inserted into
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the computer at any time.
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Installing the files
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--------------------
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At the beginning of the installation the “media” method will sort the list
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of to-be-installed packages and install them media disc by media disc. If a
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different media disc is required the user will be prompted to exchange
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the media disc.
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Preparing multiple binary media discs
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-------------------------------------
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Since the “media” method needs to know which packages are on which
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media disc one cannot use regular «Packages» files. An additional data
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field «X-Medium:» is required. The first media disc from the set should
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contain all «Packages.cd» files. To be more convenient you should
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include the «Packages.cd» files on all media discs. This ensures that
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you do not have to start with the first media disc all the time.
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Additionally the package needs to gain information which media disc is
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currently used. Thus each media disc contains the file «.disk/info»
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which contains the symbolic name for the media disc as specified by
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«X-Medium:».
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In order to be able to create the modified «Packages.cd» files, you
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have to use the «-M medium» option of dpkg-scanpackages (supported
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in dpkg-dev since 1.15.5).
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To split the “main” distribution into two media discs you will need to
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create a «Packages.cd» file for each «binary-$arch» directory.
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Afterwards you simply append the second one to the first one and
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put the resulting «Packages.cd» file into both «binary-$arch»
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directories.
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Sample Layout
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-------------
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Media disc 1 .disk/info = "Debian GNU/Linux binary-amd64"
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dists/stable/main/binary-all/
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binary-amd64/Packages.cd.gz
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binary-amd64/net/foo.deb
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contrib/binary-amd64/Packages.cd.gz
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non-free-firmware/binary-amd64/Packages.cd.gz
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non-free/binary-amd64/Packages.cd.gz
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Media disc 2 .disk/info = "Debian GNU/Linux contrib-amd64"
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dists/stable/main/binary-amd64/Packages.cd.gz
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contrib/binary-all/
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binary-amd64/Packages.cd.gz
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binary-amd64/net/foo.deb
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non-free-firmware/binary-amd64/Packages.cd.gz
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non-free/binary-amd64/Packages.cd.gz
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Media disc 3 .disk/info = "Debian GNU/Linux non-free-amd64"
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dists/stable/main/binary-amd64/Packages.cd.gz
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contrib/binary-amd64/Packages.cd.gz
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non-free-firmware/binary-amd64/Packages.cd.gz
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non-free/binary-all/
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binary-amd64/Packages.cd.gz
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binary-amd64/net/foo.deb
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To re-generate the Packages file you have to change directory into
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«dists/stable/$part» and issue «dpkg-scanpackages» as follows. It is
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assumed that you use regular compressed overrides files in
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«/pub/debian/indices».
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Media disc 1: dpkg-scanpackages -M "Debian GNU/Linux binary-amd64" \
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binary-amd64 /pub/debian/indices/override.buster.gz \
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dists/stable/ > binary-amd64/Packages
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Media disc 2: dpkg-scanpackages -M "Debian GNU/Linux contrib-amd64" \
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binary-amd64 /pub/debian/indices/override.buster.contrib.gz \
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dists/stable/ > binary-amd64/Packages
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Media disc 3: dpkg-scanpackages -M "Debian GNU/Linux non-free-amd64" \
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binary-amd64 /pub/debian/indices/override.buster.non-free.gz \
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dists/stable/ > binary-amd64/Packages
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