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Arcom Embedded Linux Technical Manual Package management

Package management

A default installation of AEL can contain several optional packages, such as the

OpenBSD Secure Shell (SSH), Web and FTP servers. If your application does not

require these and you want to free some space in the Flash, you may remove some

packages. Conversely, if you require a package that is not installed by default, you can

add packages to the board.

AEL uses the dpkg package management system to manage packages on the target

system. An application is typically packaged as a single .deb package file, which can be

installed as described in Adding packages

, below.

A library is normally split into two packages, the runtime package libFOO and the

development package libFOO-dev. The libFOO package must be installed on the target

system, while the libFOO-dev package must not. To compile and link applications

against a library, both the library package itself and the development package must also

be present in the host environment.

All of the library runtime and development packages that are included on the

Development Kit CD (even those that are not included in the default target installation)

are installed into the host environment by the installer. If you install a library package

from another source, such as one provided by Arcom technical support, you must install

the runtime and development packages into the host environment yourself. See

Installing additional packages into the host environment

, page 35.

You can view a list of packages installed on the target by running the following

command on the target:

$ dpkg –l

When you run this command, the following information is displayed:

…

ii libc6 2.3.1−5

…

ii bash 2.05b−3

…

Removing packages

Packages can be removed using dpkg. For example, enter the following to remove the

example package:

# dpkg –r example

Adding packages

Additional software components in .deb packages are on the Development Kit CD, in

the /packages folder. To add a package to the target system, follow these steps:

1 Transfer the required package to a temporary folder on the target, for example:

$ scp /mnt/cdrom/packages/ntp/ntpd_4.1.1-1_arm.deb \

root@target.example.net:/tmp

2 Install the package on the target by entering the following:

# dpkg –i /tmp/ntpd_4.1.1-1_arm.deb

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 71 72

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