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document scope of environment variables
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The docs already provide an overview of all environment variables
that are processed or forwarded by kas. However, it is not documented
which scopes is used or made available in.

This patch improves the documentation by stating the scope of each group
of variables. While changing this, we also align the capitalization of
the headlines in command-line.rst.

Signed-off-by: Felix Moessbauer <[email protected]>
[Jan: minor reformatting for NO_PROXY entry]
Signed-off-by: Jan Kiszka <[email protected]>
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fmoessbauer authored and jan-kiszka committed Apr 8, 2024
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82 changes: 63 additions & 19 deletions docs/command-line.rst
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@@ -1,4 +1,4 @@
Command line usage
Command Line Usage
==================

.. argparse::
Expand All @@ -10,20 +10,54 @@ Command line usage

.. _env-vars-label:

Environment variables
Environment Variables
---------------------

kas uses a number of environment variables to configure its behavior.
The `Variables Glossary`_ provides an overview, wherein the tuple (C,K,E)
denotes the scope of the variable.

Variable Scope
~~~~~~~~~~~~~~

**kas-container (C)**

The variable is processed or forwarded by the ``kas-container`` script.
For some variables, the variable is re-written to the container's
directory layout.

.. note::
The ``env`` section of the `project configuration` can be used to make
arbitrary environment variables available to the build environment. When
invoking the build via ``kas-container``, make sure to also forward the
corresponding environment variables into the container.

**kas (K)**

The variable is processed by kas itself. Some variables (e.g. the credentials
for the awscli) are re-written to configuration files to also support older
versions of the tooling.

**build environment (E)**

The variable is exported into the build environment. In this environment, the
``bitbake`` command is executed.


Variables Glossary
~~~~~~~~~~~~~~~~~~

+--------------------------+--------------------------------------------------+
| Environment variables | Description |
+==========================+==================================================+
| ``KAS_WORK_DIR`` | The path of the kas work directory, current work |
| | directory is the default. |
| (C, K) | directory is the default. |
+--------------------------+--------------------------------------------------+
| ``KAS_BUILD_DIR`` | The path build directory, |
| | ``${KAS_WORK_DIR}/build`` is the default. |
| (C, K) | ``${KAS_WORK_DIR}/build`` is the default. |
+--------------------------+--------------------------------------------------+
| ``KAS_REPO_REF_DIR`` | The path to the repository reference directory. |
| | Repositories in this directory are used as |
| (C, K) | Repositories in this directory are used as |
| | references when cloning. In order for kas to |
| | find those repositories, they have to be named |
| | in a specific way. The repo URLs are translated |
Expand All @@ -41,77 +75,87 @@ Environment variables
| ``KAS_MACHINE`` | configuration file. |
| ``KAS_TARGET`` | |
| ``KAS_TASK`` | |
| (C, K) | |
+--------------------------+--------------------------------------------------+
| ``KAS_PREMIRRORS`` | Specifies alternatives for repo URLs. Just like |
| ``DISTRO_APT_PREMIRRORS``| bitbake ``PREMIRRORS``, this variable consists |
| (C, K) | bitbake ``PREMIRRORS``, this variable consists |
| | of new-line separated entries. Each entry |
| | defines a regular expression to match a URL and, |
| | space-separated, its replacement. E.g.: |
| | "http://.*\.someurl\.io/ http://localmirror.net/"|
+--------------------------+--------------------------------------------------+
| ``DISTRO_APT_PREMIRRORS``| Specifies alternatives for apt URLs. Just like |
| (C) | ``KAS_PREMIRRORS``. |
+--------------------------+--------------------------------------------------+
| ``SSH_PRIVATE_KEY`` | Variable containing the private key that should |
| | be added to an internal ssh-agent. This key |
| (K) | be added to an internal ssh-agent. This key |
| | cannot be password protected. This setting is |
| | useful for CI build servers. On desktop |
| | machines, an ssh-agent running outside the kas |
| | environment is more useful. |
+--------------------------+--------------------------------------------------+
| ``SSH_PRIVATE_KEY_FILE`` | Path to the private key file that should be |
| | added to an internal ssh-agent. This key cannot |
| (K) | added to an internal ssh-agent. This key cannot |
| | be password protected. This setting is useful |
| | for CI build servers. On desktop machines, an |
| | ssh-agent running outside the kas environment is |
| | more useful. |
+--------------------------+--------------------------------------------------+
| ``SSH_AUTH_SOCK`` | SSH authentication socket. Used for cloning over |
| | SSH (alternative to ``SSH_PRIVATE_KEY`` or |
| (C,K,E) | SSH (alternative to ``SSH_PRIVATE_KEY`` or |
| | ``SSH_PRIVATE_KEY_FILE``). |
+--------------------------+--------------------------------------------------+
| ``DL_DIR`` | Environment variables that are transferred to |
| ``SSTATE_DIR`` | the bitbake environment. |
| ``SSTATE_MIRRORS`` | |
| ``TMPDIR`` | |
| (C,K,E) | |
+--------------------------+--------------------------------------------------+
| ``TMPDIR`` (K,E) | Directory for temporary files. |
+--------------------------+--------------------------------------------------+
| ``http_proxy`` | These variables define the proxy configuration |
| ``https_proxy`` | bitbake should use. |
| ``ftp_proxy`` | |
| ``no_proxy`` | |
| (C,K,E) | |
+--------------------------+--------------------------------------------------+
| ``GIT_PROXY_COMMAND`` | Set proxy for native git fetches. ``NO_PROXY`` |
| ``NO_PROXY`` | is evaluated by OpenEmbedded's oe-git-proxy |
| ``GIT_PROXY_COMMAND`` (E)| Set proxy for native git fetches. ``NO_PROXY`` |
| ``NO_PROXY`` (C,K,E) | is evaluated by OpenEmbedded's oe-git-proxy |
| | script. |
+--------------------------+--------------------------------------------------+
| ``SHELL`` | The shell to start when using the `shell` |
| | plugin. |
| (C,K,E) | plugin. |
+--------------------------+--------------------------------------------------+
| ``TERM`` | The terminal options used in the `shell` plugin. |
| (C,K,E) | |
+--------------------------+--------------------------------------------------+
| ``AWS_CONFIG_FILE`` | Path to the awscli configuration and credentials |
| |aws_cred| | files that are copied to the kas home dir. |
| (K,C) | |
+--------------------------+--------------------------------------------------+
| |git_cred| | Allows to set and configure the git credential |
| | helper in the `.gitconfig` of the kas user. |
| (K,C) | helper in the `.gitconfig` of the kas user. |
+--------------------------+--------------------------------------------------+
| ``GITCONFIG_FILE`` | Path to a `.gitconfig` file which will be |
| | copied to the kas home dir as `.gitconfig`. |
| (K,C) | copied to the kas home dir as `.gitconfig`. |
+--------------------------+--------------------------------------------------+
| ``NETRC_FILE`` | Path to a .netrc file which will be copied to |
| | the kas home dir as .netrc. |
| (K,C) | the kas home dir as .netrc. |
+--------------------------+--------------------------------------------------+
| ``CI_SERVER_HOST`` | Environment variables from gitlab CI, if set |
| ``CI_JOB_TOKEN`` | .netrc is configured to allow fetching from |
| | the gitlab instance. An entry will be appended |
| (K) | the gitlab instance. An entry will be appended |
| | in case ``NETRC_FILE`` was given as well. Note |
| | that if the file already contains an entry for |
| | that host most tools would probably take that |
| | first one. |
+--------------------------+--------------------------------------------------+
| ``GITHUB_ACTIONS`` | Environment variables from github actions. If |
| | set to `true`, `.gitconfig` is automatically |
| (K) | set to `true`, `.gitconfig` is automatically |
| | imported. For details, see ``GITCONFIG_FILE``. |
+--------------------------+--------------------------------------------------+
| ``BB_NUMBER_THREADS`` | Environment variables to control the concurrency |
| ``BB_NUMBER_THREADS`` | Environment variables to control the concurrency.|
| ``PARALLEL_MAKE`` | |
| (C,K,E) | |
+--------------------------+--------------------------------------------------+

.. |aws_cred| replace:: ``AWS_ROLE_ARN``
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