Difference between revisions of "Downgrading packages"

Downgrading packages (view source)

Revision as of 19:36, 20 May 2019

24 bytes removed , 5 years ago

Revamped existing content and integrated content from Using_Downgrade into this page

Anonymous user

imported>Dalto

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- As well as the information on this page, there is a wiki
+{{warning|Downgrading packages will almost always leave you in an unsupported partial upgrade state. These instructions are intended for advanced users who understand the consequences of downgrading packages}}
- page called Using Downgrade [https://wiki.manjaro.org/index.php?title=Downgrade] which I highly
- recommend that you read. The '''Downgrade''' program takes
- just about all of the hardwork out of both downgrading &
+__TOC__
- finding all of the packages both on your machine & on the
- web that you can use. In fact it simplifies the process
- beyond belief.
- _______________________________________________
-<br clear="all"/>
 =Introduction=
-You can downgrade the packages that you think may be causing the problem. Providing you haven't cleaned your '''/var/cache/pacman/pkg''' cache of the installation packages (this wiki page provides an easy way to '''Maintain your Pacman Cache''' [https://wiki.manjaro.org/index.php?title=Maintaining_/var/cache/pacman/pkg_for_System_Safety].
+There are sometimes circumstances that require downgrading a package temporarily.  While this should not be an issue for Manjaro users on the stable branch, it is sometimes needed when using the unstable branch.
-Once upon a time, if you didn't have the older version of the package on your machine, then it got a whole lot harder. These days, one of the benefits of using Downgrade [] is that it has made that problem easy to solve (providing you still have internet access).
-<br clear="all"/>
+=The easy way using downgrade=
-==A Pacman method==
-I do it via looking at the '''/var/log/pacman.log''' which is date/time coded down the left hand side which helps us navigate the file.
+'''downgrade''' is an application that helps automate the process of locating and downgrading packages.
-Then using the command line I change directory into where all the installation packages are stored using the following command:
- cd /var/cache/pacman/pkg
+==Installing Downgrade==
-Now that we are in the working directory it makes the next part a bit simpler.
+First you need to install Downgrade, which is available in the official repositories of Manjaro. This can be done with the following command:
-We have to use the following command to install the previously installed version of the packages that need to be downgraded:
+ pamac install downgrade
+==Using Downgrade==
+To use '''downgrade''' simply run the command followed by the name of the package you want to downgrade.  For example:
+ downgrade firefox
+This will result in output which looks like this:
+ Available packages:
+)  firefox    55.0.3  1  x86_64  (remote)
+)  firefox    60.0.1  1  x86_64  (remote)
+)  firefox    64.0.2  1  x86_64  (remote)
+)  firefox    64.0.2  1  x86_64  (local)
+)  firefox    65.0    1  x86_64  (remote)
+)  firefox    65.0    2  x86_64  (remote)
+)  firefox    65.0.1  1  x86_64  (remote)
+)  firefox    65.0.2  1  x86_64  (remote)
+ -   9)  firefox    66.0    0  x86_64  (local)
+)  firefox    66.0    1  x86_64  (remote)
+)  firefox    66.0.1  1  x86_64  (remote)
+)  firefox    66.0.2  1  x86_64  (remote)
+)  firefox    66.0.3  1  x86_64  (remote)
+)  firefox    66.0.4  1  x86_64  (remote)
+ +  15)  firefox    66.0.5  1  x86_64  (remote)
+ +  16)  firefox    66.0.5  1  x86_64  (local)
+The entries listed as "local" are versions from your local package cache.  The entries identified as "remote" are available from the Arch Linux Archive(ALA).
-  sudo pacman -U <package.name>.pkg.tar.xz
+{{warning|Installing packages from the ALA is inherently dangerous as sometimes Manjaro needs custom versions of certain packages.  Doing this can result in a broken system.  As a result, downgrading from the ALA is disabled by default on the stable branch. If needed, you can enable it by setting the environment variable <pre>DOWNGRADE_FROM_ALA=1</pre>}}
-The whole name of the package must be identical to what it is called in the '''/var/cache/pacman/pkg''' directory, or it won't work.
-The simplest way that I've found to list the contents of the ''/var/cache/pacman/pkg'' directory in a useful manner for this operation is to open a 2nd tab in my Terminal & use the following command (be sure to cd into the directory prior to using this command):
+==Adding packages to the ignore list==
-  [handy@jarmano /var/cache/pacman/pkg]$ ls | more
+After downgrading the package, you should see a message similar to this:
+  add firefox to IgnorePkg? [y/n]
-Without the command prompt:
+If you answer "y", the package will no long be upgraded in future updates until you manually remove it from the '''IgnorePkg''' line of '''/etc/pacman.conf'''
- ls |more
-Now you can move through the list of packages (the '''space bar''' moves to the next page & '''q''' quits the '''more''' display program) & highlight, copy, then move to the first Terminal tab & paste in the package name.
+=Downgrading packages manually=
-I use the cursor control keys to bring up the last package downgraded & then delete its name & paste in the next one after the '''sudo pacman -U''' .
+The directory '''/var/cache/pacman/pkg''' contains old versions of packages.  First look for the package that you wish to downgrade is this directory then use ```pacman -U``` to install it.  For example, it could look like this:
-<br clear="all"/>
-==Sometimes Trial & Error==
-It sounds harder & slower than it really is, the more you do it the more used to it you become & it just becomes a set of repetitive actions that go by pretty fast.
+We have to use the following command to install the previously installed version of the packages that need to be downgraded:
-As far as choosing which packages to downgrade you have probably done some reading & know the most likely ones already. If they don't do it just look at that section of the pacman.log & choose more packages until you get it functioning.
+ sudo pacman -U /var/cache/pacman/pkg/firefox-64.0.2-1-x86_64.pkg.tar.xz
-<br clear="all"/>
-==Block the Offender(s)==
-After that you need to block those packages from being upgraded next time you want to upgrade your system. (At least until there is a new version of any offending package.)
+==Ensuring downgraded packages won't be upgraded again==
-To do that you need to use your editor in root mode to add the simple package names into the '''/etc/pacman.conf''' file, like so:
+In order to stop these packages from being upgraded the next time you run updates, you can add them to the ignore list in '''/etc/pacman.conf'''.  Look for the section that looks like this:
+ # Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
+ # IgnorePkg =
+Remove the comment in front of '''IgnorePkg''' and add the package name to the list.  When you are done it should look like this:
   # Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
-  IgnorePkg   = ace-of-penguins nerolinux avidemux
+  IgnorePkg = firefox
-Remove the '''#''' from in front of the '''IgnorePkg''' line, & add your package names after the equal sign, separated with a space.
+Once this is done the package will no long be upgraded in future updates until you manually remove it from the '''IgnorePkg''' line of '''/etc/pacman.conf'''
-<br clear="all"/>
-=Support=
-Following is a link to this page's forum counterpart where you
-can post any related feedback: [https://forum.manjaro.org/t/wiki-downgrading-packages-with-pacman-friends/17651]
-<br clear="all"/>
 [[Category:Contents Page]]