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[[!meta title="Package Archive Layout"]]
The package archive will be laid out like a Debian pool archive but use opkg's
simpler package source list (a.k.a. "feed") structure.
Definitions
===========
Package Archive
---------------
The **package archive** is a hierarchy of directories, package indices, and
binary packages. It is accessible on mirror hosts over network protocols like
HTTP and FTP. On each mirror host, it is stored under `pub/proteanos`, relative
to the mirror site's document root.
Channel
-------
A **channel** is a set of distributions in the package archive aimed at a
particular set of users. There are two channels: `dev` for developers and `rel`
for end users and their installed systems.
Packages may be directly uploaded to distributions in the `dev` channel.
Distributions in the `rel` channel are simply static snapshots of distributions
in the `dev` channel.
Distribution
------------
A **distribution** is a set of components in the package archive with a certain
release policy and life cycle. There is one rolling release: `trunk`. All
other distributions are fixed release series distributions, e.g. `rs1`.
Normally, packages should be uploaded to the `trunk` distribution. Packages
should only be uploaded to release series distributions to backport critical
defect fixes into stable releases.
Suite
-----
A **suite** is the combination of a channel and distribution. Example suites
are `dev/trunk` and `rel/rs1`.
Component
---------
A **component** is a section of the package archive that is subject to certain
inclusion criteria. There is only one component: `main`.
Platform
--------
A **platform** is a set of architectures in the package archive with packages
configured for a particular use case.
Architecture
------------
An **architecture** is a set of packages in the package archive built for a
particular combination of processing units, kernel, and system libraries.
The `src` architecture contains source packages.
The `all` architecture contains architecture-independent binary packages.
Feed
----
A **feed** is a set of packages of a particular channel, distribution,
component, platform, and architecture in the package archive. It contains a
package index that describes all contained packages.
Package
-------
A **package** is a set of data and control files that can be installed on a
user's system.
A **source package** is a set of source package data files and control files.
It can be unpacked and built to generate binary packages.
A **binary package** is a set of compiled data files and control files. It can
be installed by an end user and used by other binary and source packages.
Package Index
-------------
A **package index** is a detailed list of all packages in a feed in the package
archive. It is either a UTF-8-encoded plain text file named `Packages` or a
gzip-compressed UTF-8-encoded plain text file named `Packages.gz`.
Pool
----
The **pool** is the common storage area for all packages.
Archive Layout
==============
The layout of the package archive is given by the following tree:
<proto>://<mirror-domain>/pub/proteanos/
+- dists/
| +- <channel>/
| +- <distribution>/
| +- <component>/
| +- <platform>/
| +- <architecture>/
| +- Packages
| +- Packages.gz
+- pool/
+- <component>/
+- <letter>/
+- <srcpkg>/
+- <binpkg>_<binver>_<arch>_<plat>.opk
Examples
--------
The compressed packages index of the `core-linux-eglibc` architecture and `dev`
platform would be located at the following path at a mirror site:
/pub/proteanos/dists/dev/trunk/main/dev/core-linux-eglibc/Packages.gz
The compressed packages index of the `src` architecture and `all` platform would
be located at the following path at a mirror site:
/pub/proteanos/dists/dev/trunk/main/all/src/Packages.gz
The `libexpat.1` binary package for the `core-linux-eglibc` architecture would
be located at the following path at a mirror site:
/pub/proteanos/pool/main/e/expat/libexpat.1_2.1.0-2_core-linux-eglibc_all.opk
Packages Index Syntax
=====================
The packages index file syntax is that used by APT, opkg, etc. It consists of
paragraphs of fields, with paragraphs separated by empty lines. Each field
consists of the field name, a colon (`:`), and the field value. Some fields may
have values spanning multiple lines; each line after the first in a value must
begin with at least one space.
The fields in a paragraph are the control fields generated for binary packages
by ob-gencontrol, plus `Installed-Size`, `Filename`, `Size`, and `MD5sum`.
Example
-------
An example paragraph of a packages index follows:
Package: libexpat.1
Source: expat
Version: 2.1.0-2
Architecture: core-linux-eglibc
Platform: all
Maintainer: "P. J. McDermott" <pjm@nac.net>
Installed-Size: 530
Filename: ../../../../../pool/main/e/expat/libexpat.1_2.1.0-2_core-linux-eglibc_all.opk
Size: 176465
MD5sum: 7d7984ab0c910ba525410562cfdb5315
Description: XML parser library
Expat is an XML parser library written in C. It is a stream-oriented parser in
which an application registers handlers for things the parser might find in the
XML document (like start tags).
Homepage: http://expat.sourceforge.net/
References
==========
Examples of Debian pool archives are the official [Debian archive][deb-arc] and
[P. J.'s "Bootstrappable Debian" archive][deb-boot-arc]. An example of a set of
opkg package source lists (a.k.a. "feeds") is the [Ångström
repository][ang-repo].
[deb-arc]: http://ftp.us.debian.org/debian/
[deb-boot-arc]: http://bootstrap.pehjota.net/archive/
[ang-repo]: http://www.angstrom-distribution.org/feeds/
|
