diskimage-builder/elements/debian-minimal/README.rst
Andreas Florath 92355004d9 Fix apt-sources configuration for debian-minimal
The apt-sources element did not work with debian-minimal, because
the later one overwrote the /etc/apt/sources.list file created by
the apt-sources element.

Two changes were made:
o the debian-minimal uses now files inside the /etc/apt/sources.list.d
  directory.  Therefore there is no possibilty for clashes between those
  two elements any more.
o instead of only adding backports, also the updates and the security
  repository is added by default which gives perfect initial
  configuration for a stable system.
  If you want to use local mirrors with other naming schemas or an
  unstable tree, there is the possibility to fully specify the
  repositories.

Change-Id: I69dbaa34be3db3d667e6bd8450ef4ce04a751c70
Signed-off-by: Andreas Florath <andreas@florath.net>
2016-05-13 09:26:49 +02:00

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==============
debian-minimal
==============
Create a minimal image based on Debian. We default to unstable but `DIB_RELEASE`
can be set to any series of Debian.
There are two ways to configure apt-sources:
1. Using the standard way of defining the default, backports, updates
and security repositories is the default. In this case you can
overwrite the two environment variables to adapt the behavior:
`DIB_DISTRIBUTION_MIRROR`: the mirror to use
default: http://httpredir.debian.org/debian
`DIB_DEBIAN_COMPONENTS`: (default) `main`
a comma separated list of components. For Debian this can be
e.g. `main,contrib,non-free`.
Note that the default Debian series is `unstable`, and the default
mirrors for Debian can be problematic for `unstable`. Because apt
does not handle changing Packages files well across multiple out of
sync mirrors, it is recommended that you choose a single mirror of
Debian, and pass it in via `DIB_DISTRIBUTION_MIRROR`.
By default only `main` component is used. If
`DIB_DEBIAN_COMPONENTS` (comma separated) from the `debootstrap`
element has been set, that list of components will be used instead.
Backports, updates and security are included unless `DIB_RELEASE`
is `unstable`.
2. Complete configuration given in the variable
`DIB_APT_SOURCES_CONF`.
Each line contains exactly one entry for the sources.list.d
directory.
The first word must be the logical name (which is used as file name
with `.list` automatically appended), followed by a colon `:`,
followed by the complete repository specification.
Example:
DIB_APT_SOURCES_CONF=\
"default:deb http://10.0.0.10/ stretch main contrib
mysecurity:deb http://10.0.0.10/ stretch-security main contrib"
If necessary, a custom apt keyring and debootstrap script can be
supplied to the `debootstrap` command via `DIB_APT_KEYRING` and
`DIB_DEBIAN_DEBOOTSTRAP_SCRIPT` respectively. Both options require the
use of absolute rather than relative paths.
Use of this element will also require the tool 'debootstrap' to be
available on your system. It should be available on Ubuntu, Debian,
and Fedora. It is also recommended that the 'debian-keyring' package
be installed.
The `DIB_OFFLINE` or more specific `DIB_DEBIAN_USE_DEBOOTSTRAP_CACHE`
variables can be set to prefer the use of a pre-cached root filesystem
tarball.
The `DIB_DEBOOTSTRAP_EXTRA_ARGS` environment variable may be used to
pass extra arguments to the debootstrap command used to create the
base filesystem image. If --keyring is is used in `DIB_DEBOOTSTRAP_EXTRA_ARGS`,
it will override `DIB_APT_KEYRING` if that is used as well.
-------------------
Note on ARM systems
-------------------
Because there is not a one-to-one mapping of `ARCH` to a kernel package, if
you are building an image for ARM on debian, you need to specify which kernel
you want in the environment variable `DIB_ARM_KERNEL`. For instance, if you want
the `linux-image-mx5` package installed, set `DIB_ARM_KERNEL` to `mx5`.