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+[#]: subject: "Use dnf updateinfo to read update changelogs"
+[#]: via: "https://fedoramagazine.org/use-dnf-updateinfo-to-read-update-changelogs/"
+[#]: author: "Mateus Rodrigues Costa https://fedoramagazine.org/author/mateusrodcosta/"
+[#]: collector: "lujun9972"
+[#]: translator: " "
+[#]: reviewer: " "
+[#]: publisher: " "
+[#]: url: " "
+
+Use dnf updateinfo to read update changelogs
+======
+
+![][1]
+
+Cover image background excerpted from photo by [Fotis Fotopoulos][2] on [Unsplash][3]
+
+This article will explore how to check the changelogs for the Fedora Linux operating system using the command line and _dnf updateinfo_. Instead of showing the commands running on a real Fedora Linux install, this article will demo running the dnf commands in [toolbox][4].
+
+### Introduction
+
+If you have used any type of computer recently (be it a desktop, laptop or even a smartphone), you most likely have had to deal with software updates. You might have an opinion about them. They might be a “necessary evil”, something that always breaks your setup and makes you waste hours fixing the new problems that appeared, or you might even like them.
+
+No matter your opinion, there are reasons to update your software: mainly bug fixes, especially security-related bug fixes. After all, you most likely don’t want someone getting your private data by exploiting a bug that happens because of a interaction between the code of your web browser and the code that renders text on your screen.
+
+If you manage your software updates in a manual or semi-manual fashion (in comparison to letting the operating system auto-update your software), one feature you should be aware of is “changelogs”.
+
+A changelog is, as the name hints, a big list of changes between two releases of the same software. The changelog content can vary a lot. It may depend on the team, the type of software, its importance, and the number of changes. It can range from a very simple “several small bugs were fixed in this release”-type message, to a list of links to the bugs fixed on a issue tracker with a small description, to a big and detailed list of changes or elaborate blog posts.
+
+Now, how do you check the changelogs for the updates?
+
+If you use Fedora Workstation the easy way to see the changelog with a GUI is with Gnome Software. Select the name of the package or name of the software on the updates page and the changelog is displayed. You could also try your favorite GUI package manager, which will most likely show it to you as well. But how does one do the same thing via CLI?
+
+### How to use dnf updateinfo
+
+Start by creating a Fedora 34 toolbox called _updateinfo-demo_:
+
+```
+toolbox create --distro fedora --release f34 updateinfo-demo
+```
+
+Now, enter the toolbox:
+
+```
+toolbox enter updateinfo-demo
+```
+
+The commands from here on can also be used on a normal Fedora install.
+
+First, check the updates available:
+
+```
+$ dnf check-update
+audit-libs.x86_64 3.0.3-1.fc34 updates
+ca-certificates.noarch 2021.2.50-1.0.fc34 updates
+coreutils.x86_64 8.32-30.fc34 updates
+coreutils-common.x86_64 8.32-30.fc34 updates
+curl.x86_64 7.76.1-7.fc34 updates
+dnf.noarch 4.8.0-1.fc34 updates
+dnf-data.noarch 4.8.0-1.fc34 updates
+expat.x86_64 2.4.1-1.fc34 updates
+file-libs.x86_64 5.39-6.fc34 updates
+glibc.x86_64 2.33-20.fc34 updates
+glibc-common.x86_64 2.33-20.fc34 updates
+glibc-minimal-langpack.x86_64 2.33-20.fc34 updates
+krb5-libs.x86_64 1.19.1-14.fc34 updates
+libcomps.x86_64 0.1.17-1.fc34 updates
+libcurl.x86_64 7.76.1-7.fc34 updates
+libdnf.x86_64 0.63.1-1.fc34 updates
+libeconf.x86_64 0.4.0-1.fc34 updates
+libedit.x86_64 3.1-38.20210714cvs.fc34 updates
+libgcrypt.x86_64 1.9.3-3.fc34 updates
+libidn2.x86_64 2.3.2-1.fc34 updates
+libmodulemd.x86_64 2.13.0-1.fc34 updates
+librepo.x86_64 1.14.1-1.fc34 updates
+libsss_idmap.x86_64 2.5.2-1.fc34 updates
+libsss_nss_idmap.x86_64 2.5.2-1.fc34 updates
+libuser.x86_64 0.63-4.fc34 updates
+libxcrypt.x86_64 4.4.23-1.fc34 updates
+nano.x86_64 5.8-3.fc34 updates
+nano-default-editor.noarch 5.8-3.fc34 updates
+nettle.x86_64 3.7.3-1.fc34 updates
+openldap.x86_64 2.4.57-5.fc34 updates
+pam.x86_64 1.5.1-6.fc34 updates
+python-setuptools-wheel.noarch 53.0.0-2.fc34 updates
+python-unversioned-command.noarch 3.9.6-2.fc34 updates
+python3.x86_64 3.9.6-2.fc34 updates
+python3-dnf.noarch 4.8.0-1.fc34 updates
+python3-hawkey.x86_64 0.63.1-1.fc34 updates
+python3-libcomps.x86_64 0.1.17-1.fc34 updates
+python3-libdnf.x86_64 0.63.1-1.fc34 updates
+python3-libs.x86_64 3.9.6-2.fc34 updates
+python3-setuptools.noarch 53.0.0-2.fc34 updates
+sssd-client.x86_64 2.5.2-1.fc34 updates
+systemd.x86_64 248.6-1.fc34 updates
+systemd-libs.x86_64 248.6-1.fc34 updates
+systemd-networkd.x86_64 248.6-1.fc34 updates
+systemd-pam.x86_64 248.6-1.fc34 updates
+systemd-rpm-macros.noarch 248.6-1.fc34 updates
+vim-minimal.x86_64 2:8.2.3182-1.fc34 updates
+xkeyboard-config.noarch 2.33-1.fc34 updates
+yum.noarch 4.8.0-1.fc34 updates
+```
+
+OK, so run your first _dnf updateinfo_ command:
+
+```
+$ dnf updateinfo
+Updates Information Summary: available
+ 5 Security notice(s)
+ 4 Moderate Security notice(s)
+ 1 Low Security notice(s)
+ 11 Bugfix notice(s)
+ 8 Enhancement notice(s)
+ 3 other notice(s)
+```
+
+This is the summary of updates. As you can see there are security updates, bugfix updates, enhancement updates and some which are not specified.
+
+Look at the list of updates and which types they belong to:
+
+```
+$ dnf updateinfo list
+FEDORA-2021-e4866762d8 enhancement audit-libs-3.0.3-1.fc34.x86_64
+FEDORA-2021-1f32e18471 bugfix ca-certificates-2021.2.50-1.0.fc34.noarch
+FEDORA-2021-b09e010a46 bugfix coreutils-8.32-30.fc34.x86_64
+FEDORA-2021-b09e010a46 bugfix coreutils-common-8.32-30.fc34.x86_64
+FEDORA-2021-83fdddca0f Moderate/Sec. curl-7.76.1-7.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix dnf-4.8.0-1.fc34.noarch
+FEDORA-2021-3b74285c43 bugfix dnf-data-4.8.0-1.fc34.noarch
+FEDORA-2021-523ee0a81e enhancement expat-2.4.1-1.fc34.x86_64
+FEDORA-2021-07625b9c81 unknown file-libs-5.39-6.fc34.x86_64
+FEDORA-2021-e14e86e40e Moderate/Sec. glibc-2.33-20.fc34.x86_64
+FEDORA-2021-e14e86e40e Moderate/Sec. glibc-common-2.33-20.fc34.x86_64
+FEDORA-2021-e14e86e40e Moderate/Sec. glibc-minimal-langpack-2.33-20.fc34.x86_64
+FEDORA-2021-8b25e4642f Low/Sec. krb5-libs-1.19.1-14.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix libcomps-0.1.17-1.fc34.x86_64
+FEDORA-2021-83fdddca0f Moderate/Sec. libcurl-7.76.1-7.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix libdnf-0.63.1-1.fc34.x86_64
+FEDORA-2021-ca22b882a5 enhancement libeconf-0.4.0-1.fc34.x86_64
+FEDORA-2021-f9c139edd8 bugfix libedit-3.1-38.20210714cvs.fc34.x86_64
+FEDORA-2021-31fdc84207 Moderate/Sec. libgcrypt-1.9.3-3.fc34.x86_64
+FEDORA-2021-bc56cf7c1f enhancement libidn2-2.3.2-1.fc34.x86_64
+FEDORA-2021-da2ec14d7f bugfix libmodulemd-2.13.0-1.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix librepo-1.14.1-1.fc34.x86_64
+FEDORA-2021-1db6330a22 unknown libsss_idmap-2.5.2-1.fc34.x86_64
+FEDORA-2021-1db6330a22 unknown libsss_nss_idmap-2.5.2-1.fc34.x86_64
+FEDORA-2021-8226c82fe9 bugfix libuser-0.63-4.fc34.x86_64
+FEDORA-2021-e6916d6758 bugfix libxcrypt-4.4.22-2.fc34.x86_64
+FEDORA-2021-fed4036fd9 bugfix libxcrypt-4.4.23-1.fc34.x86_64
+FEDORA-2021-3122d2b8d2 unknown nano-5.8-3.fc34.x86_64
+FEDORA-2021-3122d2b8d2 unknown nano-default-editor-5.8-3.fc34.noarch
+FEDORA-2021-d1fc0b9d32 Moderate/Sec. nettle-3.7.3-1.fc34.x86_64
+FEDORA-2021-97949d7a4e bugfix openldap-2.4.57-5.fc34.x86_64
+FEDORA-2021-e6916d6758 bugfix pam-1.5.1-6.fc34.x86_64
+FEDORA-2021-07931f7f08 bugfix python-setuptools-wheel-53.0.0-2.fc34.noarch
+FEDORA-2021-2056ce89d9 enhancement python-unversioned-command-3.9.6-1.fc34.noarch
+FEDORA-2021-d613e00b72 enhancement python-unversioned-command-3.9.6-2.fc34.noarch
+FEDORA-2021-2056ce89d9 enhancement python3-3.9.6-1.fc34.x86_64
+FEDORA-2021-d613e00b72 enhancement python3-3.9.6-2.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix python3-dnf-4.8.0-1.fc34.noarch
+FEDORA-2021-3b74285c43 bugfix python3-hawkey-0.63.1-1.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix python3-libcomps-0.1.17-1.fc34.x86_64
+FEDORA-2021-3b74285c43 bugfix python3-libdnf-0.63.1-1.fc34.x86_64
+FEDORA-2021-2056ce89d9 enhancement python3-libs-3.9.6-1.fc34.x86_64
+FEDORA-2021-d613e00b72 enhancement python3-libs-3.9.6-2.fc34.x86_64
+FEDORA-2021-07931f7f08 bugfix python3-setuptools-53.0.0-2.fc34.noarch
+FEDORA-2021-1db6330a22 unknown sssd-client-2.5.2-1.fc34.x86_64
+FEDORA-2021-3141f0eff1 bugfix systemd-248.6-1.fc34.x86_64
+FEDORA-2021-3141f0eff1 bugfix systemd-libs-248.6-1.fc34.x86_64
+FEDORA-2021-3141f0eff1 bugfix systemd-networkd-248.6-1.fc34.x86_64
+FEDORA-2021-3141f0eff1 bugfix systemd-pam-248.6-1.fc34.x86_64
+FEDORA-2021-3141f0eff1 bugfix systemd-rpm-macros-248.6-1.fc34.noarch
+FEDORA-2021-b8b1f6e54f enhancement vim-minimal-2:8.2.3182-1.fc34.x86_64
+FEDORA-2021-67645ae09f enhancement xkeyboard-config-2.33-1.fc34.noarch
+FEDORA-2021-3b74285c43 bugfix yum-4.8.0-1.fc34.noarch
+```
+
+The output is in three columns. These show the ID for an update, the type of the update, and the package to which it refers.
+
+If you want to see the Bodhi page for a specific update, just add the id to the end of this URL:
+.
+
+For example, for _systemd-248.6-1.fc34.x86_64_ or for _coreutils-8.32-30.fc34.x86_64_.
+
+The next command will list the actual changelog.
+
+```
+dnf updateinfo info
+```
+
+The output from this command is quite long. So only a few interesting excerpts are provided below.
+
+Start with a small one:
+
+```
+===============================================================================
+ ca-certificates-2021.2.50-1.0.fc34
+===============================================================================
+ Update ID: FEDORA-2021-1f32e18471
+ Type: bugfix
+ Updated: 2021-06-18 22:08:02
+Description: Update the ca-certificates list to the lastest upstream list.
+ Severity: Low
+```
+
+Notice how this info has the update ID, type, updated time, description and severity. Very simple and easy to understand.
+
+Now look at the _systemd_ update which, in addition to the previous items, has some bugs associated with it in Red Hat Bugzilla, a more elaborate description, and a different severity.
+
+```
+===============================================================================
+ systemd-248.6-1.fc34
+===============================================================================
+ Update ID: FEDORA-2021-3141f0eff1
+ Type: bugfix
+ Updated: 2021-07-24 22:00:30
+ Bugs: 1963428 - if keyfile >= 1024*4096-1 service "systemd-cryptsetup@" can't start
+ : 1965815 - 50-udev-default.rules references group "sgx" which does not exist
+ : 1975564 - systemd-cryptenroll SIGABRT when adding recovery key - buffer overflow
+ : 1984651 - systemd[1]: Assertion 'a <= b' failed at src/libsystemd/sd-event/sd-event.c:2903, function sleep_between(). Aborting.
+Description: - Create 'sgx' group (and also use soft-static uids for input and render, see https://pagure.io/setup/c/df3194a7295c2ca3cfa923981b046f4bd2754825 and https://pagure.io/packaging-committee/issue/1078 (#1965815)
+ : - Various bugfixes (#1963428, #1975564)
+ : - Fix for a regression introduced in the previous release with sd-event abort (#1984651)
+ :
+ : No need to log out or reboot.
+ Severity: Moderate
+```
+
+Next look at a _curl_ update. This has a security update with several [CVE][5]s associated with it. Each CVE has its respective Red Hat Bugzilla bug.
+
+```
+===============================================================================
+ curl-7.76.1-7.fc34
+===============================================================================
+ Update ID: FEDORA-2021-83fdddca0f
+ Type: security
+ Updated: 2021-07-22 22:03:07
+ Bugs: 1984325 - CVE-2021-22922 curl: wrong content via metalink is not being discarded [fedora-all]
+ : 1984326 - CVE-2021-22923 curl: Metalink download sends credentials [fedora-all]
+ : 1984327 - CVE-2021-22924 curl: bad connection reuse due to flawed path name checks [fedora-all]
+ : 1984328 - CVE-2021-22925 curl: Incorrect fix for CVE-2021-22898 TELNET stack contents disclosure [fedora-all]
+Description: - fix TELNET stack contents disclosure again (CVE-2021-22925)
+ : - fix bad connection reuse due to flawed path name checks (CVE-2021-22924)
+ : - disable metalink support to fix the following vulnerabilities
+ : CVE-2021-22923 - metalink download sends credentials
+ : CVE-2021-22922 - wrong content via metalink not discarded
+ Severity: Moderate
+```
+
+This item shows a simple enhancement update.
+
+```
+===============================================================================
+ python3-docs-3.9.6-1.fc34 python3.9-3.9.6-1.fc34
+===============================================================================
+ Update ID: FEDORA-2021-2056ce89d9
+ Type: enhancement
+ Updated: 2021-07-08 22:00:53
+Description: Update of Python 3.9 and python3-docs to latest release 3.9.6
+ Severity: None
+```
+
+Finally an “unknown” type update.
+
+```
+===============================================================================
+ file-5.39-6.fc34
+===============================================================================
+ Update ID: FEDORA-2021-07625b9c81
+ Type: unknown
+ Updated: 2021-06-11 22:16:57
+ Bugs: 1963895 - Wrong detection of python bytecode mimetypes
+Description: do not classify python bytecode files as text (#1963895)
+ Severity: None
+```
+
+### Conclusion
+
+So, in what situation does dnf updateinfo become handy?
+
+Well, you could use it if you prefer managing updates fully via the CLI, or if you are unable to successfully use the GUI tools at a specific moment.
+
+In which case is checking the changelog useful?
+
+Say you manage the updates yourself, sometimes you might not consider it ideal to stop what you are doing to update your system. Instead of simply installing the updates, you check the changelogs. This allows you to figure out whether you should prioritize your updates (maybe there’s a important security fix?) or whether to postpone a bit longer (no important fix, “I will do it later when I’m not doing anything important”).
+
+--------------------------------------------------------------------------------
+
+via: https://fedoramagazine.org/use-dnf-updateinfo-to-read-update-changelogs/
+
+作者：[Mateus Rodrigues Costa][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://fedoramagazine.org/author/mateusrodcosta/
+[b]: https://github.com/lujun9972
+[1]: https://fedoramagazine.org/wp-content/uploads/2021/08/dnf-updateinfo-816x345.jpg
+[2]: https://unsplash.com/@ffstop?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
+[3]: https://unsplash.com/?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText
+[4]: https://fedoramagazine.org/a-quick-introduction-to-toolbox-on-fedora/
+[5]: https://en.wikipedia.org/wiki/Common_Vulnerabilities_and_Exposures