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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 18:35:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 18:35:28 +0000 |
commit | ea314d2f45c40a006c0104157013ab4b857f665f (patch) | |
tree | 3ef2971cb3675c318b8d9effd987854ad3f6d3e8 /man/deb-version.pod | |
parent | Initial commit. (diff) | |
download | dpkg-ea314d2f45c40a006c0104157013ab4b857f665f.tar.xz dpkg-ea314d2f45c40a006c0104157013ab4b857f665f.zip |
Adding upstream version 1.22.4.upstream/1.22.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man/deb-version.pod')
-rw-r--r-- | man/deb-version.pod | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/man/deb-version.pod b/man/deb-version.pod new file mode 100644 index 0000000..c8368da --- /dev/null +++ b/man/deb-version.pod @@ -0,0 +1,165 @@ +# dpkg manual page - deb-version(7) +# +# Copyright © 1996-1998 Ian Jackson and Christian Schwarz +# for parts of the text reused from the Debian Policy +# Copyright © 2007 Frank Lichtenheld <djpig@debian.org> +# Copyright © 2011, 2013, 2015 Guillem Jover <guillem@debian.org> +# +# This is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <https://www.gnu.org/licenses/>. + +=encoding utf8 + +=head1 NAME + +deb-version - Debian package version number format + +=head1 SYNOPSIS + +[I<epoch>B<:>]I<upstream-version>[B<->I<debian-revision>] + +=head1 DESCRIPTION + +Version numbers as used for Debian binary and source packages +consist of three components. +These are: + +=over + +=item I<epoch> + +This is a single (generally small) unsigned integer. +It may be omitted, in which case zero is assumed. +If it is +omitted then the I<upstream-version> may not +contain any colons. + +It is provided to allow mistakes in the version numbers +of older versions of a package, and also a package's +previous version numbering schemes, to be left behind. + +=item I<upstream-version> + +This is the main part of the version number. +It is +usually the version number of the original (“upstream”) +package from which the I<.deb> file has been made, +if this is applicable. +Usually this will be in the same +format as that specified by the upstream author(s); +however, it may need to be reformatted to fit into the +package management system's format and comparison +scheme. + +The comparison behavior of the package management system +with respect to the I<upstream-version> is +described below. +The I<upstream-version> +portion of the version number is mandatory. + +The I<upstream-version> may contain only +alphanumerics (“A-Za-z0-9”) and the characters +B<.> B<+> B<-> B<:> B<~> +(full stop, plus, hyphen, colon, tilde) and should +start with a digit. +If there is no +I<debian-revision> then hyphens are not allowed; +if there is no I<epoch> then colons are not +allowed. + +=item I<debian-revision> + +This part of the version number specifies the version of +the Debian package based on the upstream version. +It +may contain only alphanumerics and the characters +B<+> B<.> B<~> +(plus, full stop, tilde) and is +compared in the same way as the +I<upstream-version> is. + +It is optional; if it isn't present then the +I<upstream-version> may not contain a hyphen. +This format represents the case where a piece of +software was written specifically to be turned into a +Debian package, and so there is only one “debianization” +of it and therefore no revision indication is required. + +It is conventional to restart the +I<debian-revision> at ‘1’ each time the +I<upstream-version> is increased. + +Dpkg will break the version +number apart at the last hyphen in the string (if there +is one) to determine the I<upstream-version> and +I<debian-revision>. +The absence of a +I<debian-revision> compares earlier than the +presence of one (but note that the I<debian-revision> +is the least significant part of the version number). + +=back + +=head2 Sorting algorithm + +The I<upstream-version> and I<debian-revision> +parts are compared by the package management system using the +same algorithm: + +The strings are compared from left to right. + +First the initial part of each string consisting entirely of +non-digit characters is determined. +These two parts (one of which may be empty) are compared lexically. +If a difference is found it is returned. +The lexical comparison is a +comparison of ASCII values modified so that all the letters +sort earlier than all the non-letters and so that a tilde +sorts before anything, even the end of a part. +For example, +the following parts are in sorted order: ‘~~’, ‘~~a’, ‘~’, +the empty part, ‘a’. + +Then the initial part of the remainder of each string which +consists entirely of digit characters is determined. +The +numerical values of these two parts are compared, and any +difference found is returned as the result of the comparison. +For these purposes an empty string (which can only occur at +the end of one or both version strings being compared) counts +as zero. + +These two steps (comparing and removing initial non-digit +strings and initial digit strings) are repeated until a +difference is found or both strings are exhausted. + +Note that the purpose of epochs is to allow us to leave behind +mistakes in version numbering, and to cope with situations +where the version numbering scheme changes. +It is +B<not> intended to cope with version numbers containing +strings of letters which the package management system cannot +interpret (such as ‘ALPHA’ or ‘pre-’), or with +silly orderings. + +=head1 NOTES + +The tilde character and its special sorting properties were introduced +in dpkg 1.10 and some parts of the dpkg build scripts only gained +support for it later in the 1.10.x series. + +=head1 SEE ALSO + +L<deb-control(5)>, +L<deb(5)>, +L<dpkg(1)> |