56

I have installed some rpm package on my Fedora 17. Some packages had a lot of dependencies. I have removed some packages but I forgot remove unused dependencies with yum remove.

How can I do that now?

migrated from stackoverflow.com Jun 6 '12 at 23:44

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37

It's not easy. How do you differentiate between "a file that was required by something I have since removed" from "a file that is not required by anything else that I really want"?

You can use the package-cleanup command from the yum-utils package to list "leaf nodes" in your package dependency graph. These are packages that can be removed without affecting anything else:

$ package-cleanup --leaves

This will produce a list of "libraries" on which nothing else depends. In most cases you can safely remove these packages. If you add --all to the command line:

$ package-cleanup --leaves --all

You'll get packages that aren't considered libraries, also, but this list is going to be so long that it probably won't be useful.

  • 8
    APT (the Debian equivalent of Yum) has a notion of “automatically installed package”. If a package wasn't explicitly requested but only pulled in as a dependency, it'll be automatically removed (with a confirmation prompt) if the packages that depend on it are all removed. Without an indication of this type, it is indeed not easy. – Gilles Jun 6 '12 at 23:53
89

If you install a package with yum install, say pdftk, it will pull in a lot of dependencies:

Installed:
  pdftk.x86_64 0:1.44-10.fc18

Dependency Installed:
  bouncycastle.noarch 0:1.46-6.fc18     
  itext-core.noarch 0:2.1.7-14.fc18     
  libgcj.x86_64 0:4.7.2-8.fc18          
  bouncycastle-mail.noarch 0:1.46-6.fc18
  java-1.5.0-gcj.x86_64 0:1.5.0.0-40.fc18
  sinjdoc.x86_64 0:0.5-13.fc18
  bouncycastle-tsp.noarch 0:1.46-5.fc18
  java_cup.noarch 1:0.11a-10.fc18
  itext.x86_64 0:2.1.7-14.fc18   
  javamail.noarch 0:1.4.3-12.fc18

Complete!

yum remove pdftk will remove only that package and not all the dependencies.

But you can look at all the 'transactions' (install, remove etc.):

$ sudo yum history list pdftk
ID     | Command line             | Date and time    | Action(s)      | Altered
-------------------------------------------------------------------------------  
    88 | install pdftk            | 2012-12-14 13:35 | Install        |   11   

And then you can undo that transaction:

$ sudo yum history undo 88
Undoing transaction 88, from Fri Dec 14 13:35:34 2012
    Dep-Install bouncycastle-1.46-6.fc18.noarch       @fedora
    Dep-Install bouncycastle-mail-1.46-6.fc18.noarch  @fedora
    Dep-Install bouncycastle-tsp-1.46-5.fc18.noarch   @fedora
    Dep-Install itext-2.1.7-14.fc18.x86_64            @fedora
    Dep-Install itext-core-2.1.7-14.fc18.noarch       @fedora
    Dep-Install java-1.5.0-gcj-1.5.0.0-40.fc18.x86_64 @fedora
    Dep-Install java_cup-1:0.11a-10.fc18.noarch       @fedora
    Dep-Install javamail-1.4.3-12.fc18.noarch         @fedora
    Dep-Install libgcj-4.7.2-8.fc18.x86_64            @fedora
    Install     pdftk-1.44-10.fc18.x86_64             @fedora
    Dep-Install sinjdoc-0.5-13.fc18.x86_64            @fedora
    ...
    Complete!
  • 14
    +1 Awesome solution and very easy to do. I've never heard of yum history. Thanks! – Stefan Lasiewski May 14 '14 at 20:24
  • 6
    And what if 89 depends on java_cup or libgcj? – WernerCD May 24 '16 at 12:28
  • 2
    Shouldn't this be an accepted answer? – Celdor Mar 7 '18 at 11:00
51

Starting from Fedora 18, you can simply use this command

yum autoremove

or

yum remove --setopt=clean_requirements_on_remove=1

You can also apply autoremove command with specific package

yum autoremove <package>

Which will remove unneeded dependencies from that installed package. autoremove is very much an alias of remove --setopt=clean_requirements_on_remove=1 but for some reasons, is still undocumented.

  • 5
    command yum remove --setopt=clean_requirements_on_remove=1 works for me in centOS – BMW Jul 13 '14 at 9:57
  • For me the package-cleanup --leaves && yum autoremove removed libvorbis and so made the internet-radio-streaming "Ices" application die -- probably because it isn't in repos and I had to compile it. – Nakilon Dec 11 '18 at 20:22
  • Command yum autoremove works on CentOS 7.6 as well. – scrutari Feb 1 at 22:20
2

I took larsks answer one step farther.

$ package-cleanup -q --leaves | xargs -l1 yum -y remove 

This grabs all of the dependencies that can be removed without affecting anything else and then removes them. Better then going through one by one.

"-q" is useful on some systems which print "Setting up yum" otherwise, causing this command to remove yum. And that's not what you want.

  • 2
    package-cleanup outputs "Setting up yum" on my machine, which resulted in Yum removing itself. I'm now trying to figure out how to sort this out. – Paul Lammertsma Feb 1 '15 at 17:05
  • @PaulLammertsma just add -q option to package-cleanup. This happened to me as well :D – Ealhad Aug 3 '15 at 15:23
  • package-cleanup -q --leaves | xargs -r -l1 yum -y remove will silently skip xargs if package-cleanup output is empty, useful for automated scripts like ansible, chef, puppet, vagrant – Ilya Sheershoff Oct 5 '18 at 16:02
1

In newer Fedoras with dnf, you can use dnf repoquery --unneeded as a replacement for package-cleanup --leaves.

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