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Installing extra packages into /target/
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=======================================
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The udeb packages can request extra packages to be installed into
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/target/. One way to use this is for grub-installer to request the
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grub package to be installed, making it easier to set up the grub boot
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loader.
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The packages will be queued for installation until base-installer is
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executed. At this point, the queued packages will be installed, and
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any requests for extra packages will be executed immediately.
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The idea is to make it possible to request packages before
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base-installer is installed, and at any point before prebaseconfig is
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executed. When /target/ or /cdrom/ is umounted by prebaseconfig, it
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is to late to install extra packages.
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Usage
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-----
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The postinst or prebaseconfig.d script for packages call a script to
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queue or install a package.
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apt-install <package>
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This script have the following return values:
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0 The package is installed, or was successfully installed into /target/
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1 The package is now queued for installation
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2 The package failed to install into /target/ (it was missing, or
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something else was wrong).
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Packages just requesting an extra package, can ignore the return value:
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apt-install <package> || true
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Packages with postinst script that need to use the installed package
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right now, will need to check the return value before doing this:
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if apt-install <package> ; then
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# do stuff
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else
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echo "error: Unable to do stuff"
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exit 1
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fi
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Implementation
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--------------
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The script will check if base-installer was successfully completed,
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and in this case will run 'apt-get install' try to fetch and install
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the packages. If base-installer isn't completed, it will add the
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package name to /var/lib/apt-install/queue.
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To make sure apt-install is available as early as possible, the script
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is included in the rootskel package.
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At the end of the base-installer postinst script, it will check this
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file and install the packages listed in the file, something like this:
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for pkg in `cat /var/lib/apt-install/queue` do
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apt-install "$pkg" || true
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done
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Files
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-----
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/bin/apt-install - request a package installed into /target/
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/var/lib/apt-install/queue - package queue, installed by base-installer
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/target/etc/apt/sources.list - file created when base-installer completes
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Comments
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--------
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The udeb kernel-installer can be changed to call 'apt-install
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<kernel>' instead of installing the package manually.
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The lilo and grub package can call 'apt-install {lilo|grub}' before
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they start to use the grub or lilo programs in /target/.
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The brltty-udeb package can call 'apt-install brltty' in its postinst
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and make sure also brltty is installed into /target/.
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