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docs: Refresh docs on updating python requirements. 

Those docs were outdated and no longer represantative of how things
work. upgrade-python-dependencies and unupgradable.json are no longer a
thing, so the entire paragraph about them should be removed.
Then the requirements/README.md file is refreshed a bit to be more
accurate.
This commit is contained in:
Mateusz Mandera 2020-03-18 13:51:22 +01:00 committed by Tim Abbott
parent f5e95c4fc1
commit 65f7231dd3
2 changed files with 3 additions and 29 deletions
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23
docs/subsystems/dependencies.md
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@ -201,29 +201,6 @@ highlighting. The system is largely managed by the code in
See the [README][requirements-readme] file in `requirements/` directory
to learn how to upgrade a single Python package.
For batches upgrades of many or all Python dependencies, we have the
script `./tools/upgrade-python-dependencies`. This script will update
the outdated packages one at a time, create a commit for each package
if the backend tests pass and pushes the working branch to your GitHub
fork. Make sure to enable [caching][caching] your GitHub credentials
so that Git won't keep asking you for it during each push. When a
package cannot be upgraded due to test failures or other issues the
error message would be stored in the file
`var/log/python_dependency_upgrade/<package_name>`. We also maintain a
list of packages that cannot be upgraded in
`requirements/unupgradable.json`. The script won't attempt to upgrade
the packages in this list. Most of these packages requires changes in
upstream for us to upgrade them. The remaining ones are usually
packages that involves significant changes in our codebase. The
packages that are easier to upgrade by making some minor changes in
our codebase won't make it to this list. Only issues are created for
them in GitHub with the label `area: dependencies`. Keep in mind that
this script would take a significant amount of time to complete. Our
recommended way of running this script is in a cloud VM which has
super fast internet. You can use tmux or screen to make sure that the
[script keeps running even if you get disconnected][stack-overflow]
from the SSH session.
[mypy-docs]: ../testing/mypy.md
[requirements-readme]: https://github.com/zulip/zulip/blob/master/requirements/README.md#requirements
[stack-overflow]: https://askubuntu.com/questions/8653/how-to-keep-processes-running-after-ending-ssh-session

9
requirements/README.md
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@ -11,12 +11,9 @@ mypy,docs
Of the files, only dev, prod, and mypy have been used in the install
scripts directly. The rest are implicit dependencies.
common and dev are locked.
Steps to update a lock file, e.g. to update ipython from 5.3.0 to 6.0.0 in
common.in and propagate it to dev.txt and prod.txt:
0. Replace `ipython==5.4.1` with `ipython==6.0.0` in common.in.
1. Run `./tools/update-locked-requirements`.
Steps to update a lock file, e.g. to update ipython from 5.3.0 to latest version:
0. Remove entries for `ipython==5.4.1` in dev.txt and prod.txt.
1. Run `./tools/update-locked-requirements`, which will generate new entries, pinned to the latest version.
2. Increase `PROVISION_VERSION` in `version.py`.
3. Run `./tools/provision` to install the new deps and test them.
4. Commit your changes.