deb(5) Debian deb(5)
NAME
deb - Debian binary package format
SYNOPSIS
filename.deb
DESCRIPTION
The .deb format is the Debian binary package file format. It is understood by dpkg 0.93.76 and later, and is generated by default by all
versions of dpkg since 1.2.0 and all i386/ELF versions since 1.1.1elf.
The format described here is used since Debian 0.93; details of the old format are described in deb-old(5).
FORMAT
The file is an ar archive with a magic value of !<arch>. The file names might contain a trailing slash.
The tar archives currently allowed are, the old-style (v7) format, the pre-POSIX ustar format, a subset of the GNU format (only the new
style long pathnames and long linknames, supported since dpkg 1.4.1.17), and the POSIX ustar format (long names supported since dpkg
1.15.0). Unrecognized tar typeflags are considered an error.
The first member is named debian-binary and contains a series of lines, separated by newlines. Currently only one line is present, the for-
mat version number, 2.0 at the time this manual page was written. Programs which read new-format archives should be prepared for the minor
number to be increased and new lines to be present, and should ignore these if this is the case.
If the major number has changed, an incompatible change has been made and the program should stop. If it has not, then the program should
be able to safely continue, unless it encounters an unexpected member in the archive (except at the end), as described below.
The second required member is named control.tar.gz. It is a gzipped tar archive containing the package control information, as a series of
plain files, of which the file control is mandatory and contains the core control information. The control tarball may optionally contain
an entry for `.', the current directory.
The third, last required member is named data.tar. It contains the filesystem as a tar archive, either not compressed (supported since
dpkg 1.10.24), or compressed with gzip (with .gz extension), xz (with .xz extension, supported since dpkg 1.15.6), bzip2 (with .bz2 exten-
sion, supported since dpkg 1.10.24) or lzma (with .lzma extension, supported since dpkg 1.13.25).
These members must occur in this exact order. Current implementations should ignore any additional members after data.tar. Further members
may be defined in the future, and (if possible) will be placed after these three. Any additional members that may need to be inserted
before data.tar and which should be safely ignored by older programs, will have names starting with an underscore, `_'.
Those new members which won't be able to be safely ignored will be inserted before data.tar with names starting with something other than
underscores, or will (more likely) cause the major version number to be increased.
SEE ALSO
deb-old(5), dpkg-deb(1), deb-control(5).
Debian Project 2009-02-27 deb(5)
