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# Tweed.MAINTAIN
*TWEED* applications are upgraded by updating the respective package manager.
The update procedure installs new versions of the applications and any new
versions of dependencies. The update frequency can be determined by keeping an
eye out for new application versions. If there are of the order of ten version
upgrades per year, for example, then a monthly upgrade cycle would be a good
way to keep up-to-date.
All three package managers use a hash value as part of the pathname for an
application. Since all versions of an application have a different hash value
there is no conflict between older and newer versions. Older versions are
retained in the store by default. It is possible to immediately switch to any
version that has previously been installed.
Each of the three package managers has its own update procedure. To upgrade
any given application it is only necessary to update one package manager.
Sometimes an application has not been upgraded but some of its dependencies
have been. It is up to the user to decide whether or not to update the package
manager in this case. It is often acceptable to skip the dependency updates
and wait for an upgrade to the application itself.
The update procedures are outlined below. Each package manager also offers a
way to delete unused files. This is termed *garbage collection*.
Part 1: GNU Guix update procedure
---------------------------------
The command to update the GNU Guix installation is:
$ guix package --upgrade
The command to delete unused files is:
$ guix gc --collect-garbage
The command to delete previous application versions is:
$ guix package --delete-generations
The command to download the latest version of GNU Guix, with its list of the
new package versions, is:
$ guix pull
More information on these commands is avaialable in the [GNU Guix
manual](https://www.gnu.org/software/guix/manual/html_node/index.html).
Part 2: Nix update procedure
----------------------------
The command to update the Nix installation is:
$ nix-env --upgrade
The command to delete unused files is:
$ nix-store --gc
The command to delete previous application versions is:
$ nix-env --delete-generations old
The command to download the latest list of the packages is:
$ nix-channel --update
More information on these commands is avaialable in the [Nix
manual](http://nixos.org/nix/manual/).
Part 3: HashDist update procedure
---------------------------------
There are two stages to an update of the HashDist store; first updating the
HashStack with the latest build instructions, then re-running the build
process. To update the HashStack use git:
$ git pull origin master
The HashDist update procedure is a repeat of the latter part of the original
installation process. First, move to the HashStack directory and delete the
``default`` link:
$ rm default
Then, for a system with M cores available for the build process, run the
command:
$ hit build -jM
followed by:
$ sh tweed.hashdist.post-install
HashDist deletes previous application versions and removes unused files in one
command:
$ hit gc
More information on HashDist is avaialable in the [HashDist
manual](http://hashdist.readthedocs.io/en/latest/index.html).
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