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build-kernel/README.md

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Update example/add reqs, support for f32 and kernel 5.6+
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### build-kernel
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This playbook is used to automatically build a kernel with an ACS overrides patch applied. Useful to isolate PCI-e devices to their own IOMMU group for VFIO passthrough.
See this page for kernel configuration details: https://copr.fedorainfracloud.org/coprs/jlay/kernel-acspatch/
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### Requirements
- Inventory with one host
- `hosts-local` provided as a sample inventory for localhost
- This host must be running Fedora (builds use mock)
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### Usage
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#### Notes
Target Fedora version is controlled by the variable `fedora_version` in [./playbook.yml](./playbook.yml)
Patch to apply is determined by the `patch_file` variable, stored in [./payload/](./payload)
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Patches for many different kernel versions provided, the highest version available should be current/working. Patch versions only change when `diffs` change.
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#### Output:
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```
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$ ansible-playbook -i buildserver playbook.yml -b --ask-become-pass
BECOME password:
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PLAY [buildservers] *******************************************************************************************************************************************
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TASK [Gathering Facts] ****************************************************************************************************************************************
ok: [buildserver]
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TASK [Ensure fedpkg is installed] *****************************************************************************************************************************
changed: [buildserver]
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TASK [Find old mock chroots] **********************************************************************************************************************************
ok: [buildserver]
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TASK [Clean old mock chroots] *********************************************************************************************************************************
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TASK [Clean old build dir] ************************************************************************************************************************************
ok: [buildserver]
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TASK [Clone f32 kernel to /tmp/f32_kernel] ********************************************************************************************************************
changed: [buildserver]
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TASK [Copy patch to build dir] ********************************************************************************************************************************
changed: [buildserver]
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TASK [Copy newpatch.sh on master branch, for 5.6 on f31] ******************************************************************************************************
changed: [buildserver]
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TASK [Apply patch and build kernel (logs in /tmp/f32_kernel/results_kernel/*)] ********************************************************************************
changed: [buildserver] => (item=./scripts/newpatch.sh acso-5.4.6.patch)
changed: [buildserver] => (item=/usr/bin/sed -i -e 's/%define buildid .*$/%define buildid .acspatch/' kernel.spec)
changed: [buildserver] => (item=/usr/bin/make release)
changed: [buildserver] => (item=fedpkg mockbuild)
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TASK [Find RPMs in /tmp/f32_kernel/results_kernel/*/*/*.rpm] **************************************************************************************************
ok: [buildserver]
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TASK [Copy RPMs to /tmp/ (local)] *****************************************************************************************************************************
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[...]
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PLAY RECAP ****************************************************************************************************************************************************
buildserver : ok=10 changed=6 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
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```
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