This article provides guidance on how to pass variables dynamically in GitHub Actions. It covers setting variables using the set-output action and accessing them using the get-output action. Moreover, it discusses best practices for passing variables
How to pass variables in GitHub Actions
1. How can I dynamically set variables in GitHub Actions?
GitHub Actions allows you to dynamically set variables using the set-output
and get-output
actions. To set a variable, use the set-output
action, specifying the name of the variable and its value. For example:
<code>- name: Set variable id: setVar run: echo "::set-output name=myVar::hello"</code>
To access the variable, use the get-output
action, providing the name of the variable. For example:
<code>- name: Get variable run: | varValue=$(echo "${{ steps.setVar.outputs.myVar }}") echo "Variable value: $varValue"</code>
2. What are the best practices for passing variables between steps in GitHub Actions?
When passing variables between steps in GitHub Actions, it is recommended to follow best practices to ensure clarity and avoid potential issues:
with
keyword to pass variables from one step to another.3. How do I access variables defined in a previous workflow in GitHub Actions?
To access variables defined in a previous workflow in GitHub Actions, you can use the needs
keyword. This allows you to create a dependency between the current workflow and the one that defined the variables. The variables from the earlier workflow can then be accessed using the outputs
property of the needs
step. For example:
<code>- needs: getVar uses: actions/github-script@v3 with: script: VAR={{ fromJSON(needs.getVar.outputs.output) }} env: MY_VAR: ${{ VAR.myVar }}</code>
Where getVar
is the name of the previous workflow that defined the variables.
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