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# CI Templates
This folder contains azure pipeline yml templates for "Core" and "Platform" Continuous Integration and PR validation.
## Common CI templates
### basetools-build-steps.yml
This template compiles the Edk2 basetools from source. The steps in this template are
conditional and will only run if variable `pkg_count` is greater than 0.
It also has two conditional steps only used when the toolchain contains GCC. These two steps
use `apt` to update the system packages and add those necessary for Edk2 builds.
## Core CI templates
### pr-gate-build-job.yml
This templates contains the jobs and most importantly the matrix of which packages and
targets to run for Core CI.
### pr-gate-steps.yml
This template is the main Core CI template. It controls all the steps run and is responsible for most functionality of the Core CI process. This template sets
the `pkg_count` variable using the `stuart_pr_eval` tool when the
build type is "pull request"
### spell-check-prereq-steps.yml
This template installs the node based tools used by the spell checker plugin. The steps
in this template are conditional and will only run if variable `pkg_count` is greater than 0.
## Platform CI templates
### platform-build-run-steps.yml
This template makes heavy use of pytools to build and run a platform in the Edk2 repo
Also uses basetools-build-steps.yml to compile basetools
#### Special Notes
* For a build type of pull request it will conditionally build if the patches change files that impact the platform.
* uses `stuart_pr_eval` to determine impact
* For manual builds or CI builds it will always build the platform
* It compiles basetools from source
* Will use `stuart_build --FlashOnly` to attempt to run the built image if the `Run` parameter is set.
* See the parameters block for expected configuration options
* Parameter `extra_install_step` allows the caller to insert extra steps. This is useful if additional dependencies, tools, or other things need to be installed. Here is an example of installing qemu on Windows.
``` yaml
steps:
- template: ../../.azurepipelines/templates/build-run-steps.yml
parameters:
extra_install_step:
- powershell: choco install qemu; Write-Host "##vso[task.prependpath]c:\Program Files\qemu"
displayName: Install QEMU and Set QEMU on path # friendly name displayed in the UI
condition: and(gt(variables.pkg_count, 0), succeeded())
```
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