Environment variable reference
All build processes have the following environment variables automatically defined and available for each build step:
- READTHEDOCS
Whether the build is running inside Read the Docs.
- Default:
True
- READTHEDOCS_LANGUAGE
The locale name, or the identifier for the locale, for the project being built. This value comes from the project’s configured language code, which is in lowercase and use a dash as a separator.
- Example:
en
- Example:
it
- Example:
de-at
- Example:
es
- Example:
pt-br
- READTHEDOCS_VERSION
The slug of the version being built, such as
latest
,stable
, or a branch name likefeature-1234
. For pull request builds, the value will be the pull request number.
- READTHEDOCS_VERSION_NAME
The verbose name of the version being built, such as
latest
,stable
, or a branch name likefeature/1234
.
- READTHEDOCS_VERSION_TYPE
The type of the version being built.
- Example:
branch
- Example:
tag
- Example:
external
(for pull request builds)- Example:
unknown
- READTHEDOCS_VIRTUALENV_PATH
Path for the virtualenv that was created for this build. Only exists for builds using Virtualenv and not Conda.
- Example:
/home/docs/checkouts/readthedocs.org/user_builds/project/envs/version
- READTHEDOCS_OUTPUT
Base path for well-known output directories. Files in these directories will automatically be found, uploaded and published.
You need to concatenate an output format to this variable. Currently valid formats are
html
,pdf
,htmlzip
andepub
. (e.g.$READTHEDOCS_OUTPUT/html/
or$READTHEDOCS_OUTPUT/pdf/
) You also need to create the directory before moving outputs into the destination. You can create it with the following commandmkdir -p $READTHEDOCS_OUTPUT/html/
. Note that onlyhtml
supports multiple files, the other formats should have one and only one file to be uploaded.See also
- Where to put files
Information about using custom commands to generate output that will automatically be published once your build succeeds.
- READTHEDOCS_CANONICAL_URL
Canonical base URL for the version that is built. If the project has configured a custom domain (e.g.
docs.example.com
) it will be used in the resulting canonical URL. Otherwise, your project’s default subdomain will be used.The path for the language and version is appended to the domain, so the final canonical base URLs can look like the following examples:
- Example:
https://docs.example.com/en/latest/
- Example:
https://docs.readthedocs.io/ja/stable/
- Example:
https://example--17.org.readthedocs.build/fr/17/
- READTHEDOCS_GIT_CLONE_URL
URL for the remote source repository, from which the documentation is cloned. It could be HTTPS, SSH or any other URL scheme supported by Git. This is the same URL defined in your Project’s dashboard in .
- Example:
https://github.com/readthedocs/readthedocs.org
- Example:
git@github.com:readthedocs/readthedocs.org.git
- READTHEDOCS_GIT_IDENTIFIER
Contains the Git identifier that was checked out from the remote repository URL. Possible values are either a branch or tag name.
- Example:
v1.x
- Example:
bugfix/docs-typo
- Example:
feature/signup
- Example:
update-readme
- READTHEDOCS_GIT_COMMIT_HASH
Git commit hash identifier checked out from the repository URL.
- Example:
1f94e04b7f596c309b7efab4e7630ed78e85a1f1
See also
- Environment variable overview
General information about how environment variables are used in the build process.
- How to use custom environment variables
Learn how to define your own custom environment variables, in addition to the pre-defined ones.