17 KiB
RPM 包初窥
也许,Fedora 社区追求其促进自由和开源的软件和内容的使命的最著名方法就是开发 Fedora 软件发行版了。因此,我们将很大一部分的社区资源用于此任务也就不足为奇了。这篇文章总结了这些软件是如何“打包”的,以及使之成为可能的基础工具,如 rpm
之类。
RPM:最小的软件单元
用户可以选择的“版本”和“风味版”(spins / labs / silverblue)其实非常相似。它们都是由各种软件组成的,这些软件经过混合和搭配,可以很好地协同工作。它们之间的不同之处在于放入其中的具体工具不同。这种选择取决于它们所针对的用例。所有这些的“版本”和“风味版”基本组成单位是 RPM 软件包文件。
RPM 文件是类似于 ZIP 文件或 tarball 的存档文件。实际上,它们使用了压缩来减小存档文件的大小。但是,除了文件之外,RPM 存档中还包含有关软件包的元数据。可以使用 rpm
工具查询:
$ rpm -q fpaste
fpaste-0.3.9.2-2.fc30.noarch
$ rpm -qi fpaste
Name : fpaste
Version : 0.3.9.2
Release : 2.fc30
Architecture: noarch
Install Date: Tue 26 Mar 2019 08:49:10 GMT
Group : Unspecified
Size : 64144
License : GPLv3+
Signature : RSA/SHA256, Thu 07 Feb 2019 15:46:11 GMT, Key ID ef3c111fcfc659b9
Source RPM : fpaste-0.3.9.2-2.fc30.src.rpm
Build Date : Thu 31 Jan 2019 20:06:01 GMT
Build Host : buildhw-07.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
Vendor : Fedora Project
URL : https://pagure.io/fpaste
Bug URL : https://bugz.fedoraproject.org/fpaste
Summary : A simple tool for pasting info onto sticky notes instances
Description :
It is often useful to be able to easily paste text to the Fedora
Pastebin at http://paste.fedoraproject.org and this simple script
will do that and return the resulting URL so that people may
examine the output. This can hopefully help folks who are for
some reason stuck without X, working remotely, or any other
reason they may be unable to paste something into the pastebin
$ rpm -ql fpaste
/usr/bin/fpaste
/usr/share/doc/fpaste
/usr/share/doc/fpaste/README.rst
/usr/share/doc/fpaste/TODO
/usr/share/licenses/fpaste
/usr/share/licenses/fpaste/COPYING
/usr/share/man/man1/fpaste.1.gz
安装 RPM 软件包后,rpm
工具可以知道具体哪些文件被添加到了系统中。因此,删除该软件包也会删除这些文件,并使系统保持一致状态。这就是为什么要尽可能地使用 rpm
安装软件,而不是从源代码安装软件的原因。
依赖关系
如今,完全独立的软件已经非常罕见。甚至 fpaste,连这样一个简单的单个文件的 Python 脚本,都需要安装 Python 解释器。因此,如果系统未安装 Python(几乎不可能,但有可能),则无法使用 fpaste
。用打包者的术语来说,“Python 是 fpaste
的运行时依赖项。”
构建 RPM 软件包时(本文不讨论构建 RPM 的过程),生成的归档文件中包括了所有这些元数据。这样,与 RPM 软件包归档文件交互的工具就知道必须要安装其它的什么东西,以便 fpaste
可以正常工作:
$ rpm -q --requires fpaste
/usr/bin/python3
python3
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1
$ rpm -q --provides fpaste
fpaste = 0.3.9.2-2.fc30
$ rpm -qi python3
Name : python3
Version : 3.7.3
Release : 3.fc30
Architecture: x86_64
Install Date: Thu 16 May 2019 18:51:41 BST
Group : Unspecified
Size : 46139
License : Python
Signature : RSA/SHA256, Sat 11 May 2019 17:02:44 BST, Key ID ef3c111fcfc659b9
Source RPM : python3-3.7.3-3.fc30.src.rpm
Build Date : Sat 11 May 2019 01:47:35 BST
Build Host : buildhw-05.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
Vendor : Fedora Project
URL : https://www.python.org/
Bug URL : https://bugz.fedoraproject.org/python3
Summary : Interpreter of the Python programming language
Description :
Python is an accessible, high-level, dynamically typed, interpreted programming
language, designed with an emphasis on code readability.
It includes an extensive standard library, and has a vast ecosystem of
third-party libraries.
The python3 package provides the "python3" executable: the reference
interpreter for the Python language, version 3.
The majority of its standard library is provided in the python3-libs package,
which should be installed automatically along with python3.
The remaining parts of the Python standard library are broken out into the
python3-tkinter and python3-test packages, which may need to be installed
separately.
Documentation for Python is provided in the python3-docs package.
Packages containing additional libraries for Python are generally named with
the "python3-" prefix.
$ rpm -q --provides python3
python(abi) = 3.7
python3 = 3.7.3-3.fc30
python3(x86-64) = 3.7.3-3.fc30
python3.7 = 3.7.3-3.fc30
python37 = 3.7.3-3.fc30
解决 RPM 依赖关系
虽然 rpm
知道每个归档文件所需的依赖关系,但不知道在哪里找到它们。这是设计使然:rpm
仅适用于本地文件,必须具体告知它们的位置。因此,如果你尝试安装单个 RPM 软件包,则 rpm
找不到该软件包的运行时依赖项时就会出错。本示例尝试安装从 Fedora 软件包集中下载的软件包:
$ ls
python3-elephant-0.6.2-3.fc30.noarch.rpm
$ rpm -qpi python3-elephant-0.6.2-3.fc30.noarch.rpm
Name : python3-elephant
Version : 0.6.2
Release : 3.fc30
Architecture: noarch
Install Date: (not installed)
Group : Unspecified
Size : 2574456
License : BSD
Signature : (none)
Source RPM : python-elephant-0.6.2-3.fc30.src.rpm
Build Date : Fri 14 Jun 2019 17:23:48 BST
Build Host : buildhw-02.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager : Fedora Project
Vendor : Fedora Project
URL : http://neuralensemble.org/elephant
Bug URL : https://bugz.fedoraproject.org/python-elephant
Summary : Elephant is a package for analysis of electrophysiology data in Python
Description :
Elephant - Electrophysiology Analysis Toolkit Elephant is a package for the
analysis of neurophysiology data, based on Neo.
$ rpm -qp --requires python3-elephant-0.6.2-3.fc30.noarch.rpm
python(abi) = 3.7
python3.7dist(neo) >= 0.7.1
python3.7dist(numpy) >= 1.8.2
python3.7dist(quantities) >= 0.10.1
python3.7dist(scipy) >= 0.14.0
python3.7dist(six) >= 1.10.0
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PartialHardlinkSets) <= 4.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1
$ sudo rpm -i ./python3-elephant-0.6.2-3.fc30.noarch.rpm
error: Failed dependencies:
python3.7dist(neo) >= 0.7.1 is needed by python3-elephant-0.6.2-3.fc30.noarch
python3.7dist(quantities) >= 0.10.1 is needed by python3-elephant-0.6.2-3.fc30.noarch
理论上,你可以下载 python3-elephant
所需的所有软件包,并告诉 rpm
它们都在哪里,但这并不方便。如果 python3-neo
和 python3-quantities
还有其它的运行时要求怎么办?很快,这种“依赖链”就会变得相当复杂。
存储库
幸运的是,有了 dnf
和它的朋友们,可以帮助解决此问题。与 rpm
不同,dnf
能感知到存储库。存储库是程序包的集合,带有告诉 dnf
这些存储库包含什么内容的元数据。所有 Fedora 系统都带有默认启用的默认 Fedora 存储库:
$ sudo dnf repolist
repo id repo name status
fedora Fedora 30 - x86_64 56,582
fedora-modular Fedora Modular 30 - x86_64 135
updates Fedora 30 - x86_64 - Updates 8,573
updates-modular Fedora Modular 30 - x86_64 - Updates 138
updates-testing Fedora 30 - x86_64 - Test Updates 8,458
在 Fedora 快速文档中有这些存储库以及如何管理它们的更多信息。
dnf
可用于查询存储库以获取有关它们包含的软件包信息。它还可以在这些存储库中搜索软件,或从中安装/卸载/升级软件包:
$ sudo dnf search elephant
Last metadata expiration check: 0:05:21 ago on Sun 23 Jun 2019 14:33:38 BST.
============================================================================== Name & Summary Matched: elephant ==============================================================================
python3-elephant.noarch : Elephant is a package for analysis of electrophysiology data in Python
python3-elephant.noarch : Elephant is a package for analysis of electrophysiology data in Python
$ sudo dnf list \*elephant\*
Last metadata expiration check: 0:05:26 ago on Sun 23 Jun 2019 14:33:38 BST.
Available Packages
python3-elephant.noarch 0.6.2-3.fc30 updates-testing
python3-elephant.noarch 0.6.2-3.fc30 updates
安装依赖项
现在使用 dnf
安装软件包时,它将解决所有必需的依赖项,然后调用 rpm
执行该事务操作:
$ sudo dnf install python3-elephant
Last metadata expiration check: 0:06:17 ago on Sun 23 Jun 2019 14:33:38 BST.
Dependencies resolved.
==============================================================================================================================================================================================
Package Architecture Version Repository Size
==============================================================================================================================================================================================
Installing:
python3-elephant noarch 0.6.2-3.fc30 updates-testing 456 k
Installing dependencies:
python3-neo noarch 0.8.0-0.1.20190215git49b6041.fc30 fedora 753 k
python3-quantities noarch 0.12.2-4.fc30 fedora 163 k
Installing weak dependencies:
python3-igor noarch 0.3-5.20150408git2c2a79d.fc30 fedora 63 k
Transaction Summary
==============================================================================================================================================================================================
Install 4 Packages
Total download size: 1.4 M
Installed size: 7.0 M
Is this ok [y/N]: y
Downloading Packages:
(1/4): python3-igor-0.3-5.20150408git2c2a79d.fc30.noarch.rpm 222 kB/s | 63 kB 00:00
(2/4): python3-elephant-0.6.2-3.fc30.noarch.rpm 681 kB/s | 456 kB 00:00
(3/4): python3-quantities-0.12.2-4.fc30.noarch.rpm 421 kB/s | 163 kB 00:00
(4/4): python3-neo-0.8.0-0.1.20190215git49b6041.fc30.noarch.rpm 840 kB/s | 753 kB 00:00
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 884 kB/s | 1.4 MB 00:01
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : python3-quantities-0.12.2-4.fc30.noarch 1/4
Installing : python3-igor-0.3-5.20150408git2c2a79d.fc30.noarch 2/4
Installing : python3-neo-0.8.0-0.1.20190215git49b6041.fc30.noarch 3/4
Installing : python3-elephant-0.6.2-3.fc30.noarch 4/4
Running scriptlet: python3-elephant-0.6.2-3.fc30.noarch 4/4
Verifying : python3-elephant-0.6.2-3.fc30.noarch 1/4
Verifying : python3-igor-0.3-5.20150408git2c2a79d.fc30.noarch 2/4
Verifying : python3-neo-0.8.0-0.1.20190215git49b6041.fc30.noarch 3/4
Verifying : python3-quantities-0.12.2-4.fc30.noarch 4/4
Installed:
python3-elephant-0.6.2-3.fc30.noarch python3-igor-0.3-5.20150408git2c2a79d.fc30.noarch python3-neo-0.8.0-0.1.20190215git49b6041.fc30.noarch python3-quantities-0.12.2-4.fc30.noarch
Complete!
请注意,dnf
甚至还安装了python3-igor
,而它不是 python3-elephant
的直接依赖项。
DnfDragora:DNF 的一个图形界面
尽管技术用户可能会发现 dnf
易于使用,但并非所有人都这样认为。Dnfdragora 通过为 dnf
提供图形化前端来解决此问题。
从上面可以看到,dnfdragora 似乎提供了 dnf
的所有主要功能。
Fedora 中还有其他工具也可以管理软件包,GNOME 的“软件”和“发现”就是其中两个。GNOME “软件”仅专注于图形应用程序。你无法使用这个图形化前端来安装命令行或终端工具,例如 htop
或 weechat
。但是,GNOME “软件”支持安装 dnf
所不支持的 Flatpak 和 Snap 应用程序。它们是针对不同目标受众的不同工具,因此提供了不同的功能。
这篇文章仅触及到了 Fedora 软件的生命周期的冰山一角。本文介绍了什么是 RPM 软件包,以及使用 rpm
和 dnf
的主要区别。
在以后的文章中,我们将详细介绍:
- 创建这些程序包所需的过程
- 社区如何测试它们以确保它们正确构建
- 社区用来将其给到社区用户的基础设施
via: https://fedoramagazine.org/rpm-packages-explained/
作者:Ankur Sinha "FranciscoD" 选题:lujun9972 译者:wxy 校对:校对者ID