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workflows: bootlinux: add kernel configuration fragments support
Add comprehensive kernel configuration fragment system that enables building kernels using merge_config.sh with focused configuration fragments instead of monolithic config files. Key features: - Modular Kconfig organization split into logical categories - Support for both x86_64 and ARM64 architectures - Architecture-specific fragment visibility (ARM64 page sizes) - Module dependency management for advanced features - New fragments for extended modversions, kmemleak, and module testing Fragment categories: - Essential: Core system requirements (64bit, systemd, distro, storage) - Security: Hardening and security features - Architecture: Platform-specific optimizations - Development: Debugging and diagnostic tools - Memory: NUMA and memory management features - Modules: Kernel module system configuration - Advanced: eBPF, XArray, and specialized features - Container: Virtualization and container support - Specialized: Minimal kernels, power management, Rust support - Legacy: Compatibility and legacy feature support Technical implementation: - Uses merge_config.sh for robust fragment composition - Complete integration with kdevops build workflow - Supports both 9P and target build modes - Pre-built configurations for common setups - Template-based fragment management Configuration fragments origin: https://github.com/dkruces/linux-config-fragments Generated-by: Claude AI Signed-off-by: Daniel Gomez <[email protected]>
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‎defconfigs/configs/linux_kdevops.config‎

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CONFIG_BOOTLINUX_USE_CONFIG_FRAGMENTS=y
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CONFIG_BOOTLINUX_FRAGMENT_64BIT=y
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CONFIG_BOOTLINUX_FRAGMENT_KVM_GUEST=y
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CONFIG_BOOTLINUX_FRAGMENT_VIRTIO_FS=y
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CONFIG_BOOTLINUX_FRAGMENT_SYSTEMD=y
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CONFIG_BOOTLINUX_FRAGMENT_DISTRO=y
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CONFIG_BOOTLINUX_FRAGMENT_STORAGE=y
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CONFIG_BOOTLINUX_FRAGMENT_INITRAMFS=y
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CONFIG_BOOTLINUX_FRAGMENT_LOCALAUTO=y
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CONFIG_BOOTLINUX_FRAGMENT_MODULES=y
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CONFIG_BOOTLINUX_FRAGMENT_MODULES_BLK=y

‎defconfigs/configs/linux_minimal.config‎

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CONFIG_BOOTLINUX_USE_CONFIG_FRAGMENTS=y
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CONFIG_BOOTLINUX_FRAGMENT_64BIT=y
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CONFIG_BOOTLINUX_FRAGMENT_KVM_GUEST=y
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CONFIG_BOOTLINUX_FRAGMENT_VIRTIO_FS=y
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CONFIG_BOOTLINUX_FRAGMENT_SYSTEMD=y
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CONFIG_BOOTLINUX_FRAGMENT_DISTRO=y
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CONFIG_BOOTLINUX_FRAGMENT_STORAGE=y
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CONFIG_BOOTLINUX_FRAGMENT_INITRAMFS=y
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CONFIG_BOOTLINUX_FRAGMENT_LOCALAUTO=y

‎playbooks/roles/bootlinux/defaults/main.yml‎

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@@ -98,3 +98,46 @@ bootlinux_tree_custom_localversion: false
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bootlinux_is_dev_node: false
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bootlinux_debug_ref: "{{ lookup('env', 'DEBUG_REF') | default(false, true) | bool }}"
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# Kernel configuration fragments support
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bootlinux_use_config_fragments: false
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# Upstream kernel fragments
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bootlinux_fragment_tiny: false
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bootlinux_fragment_nopm: false
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bootlinux_fragment_debug: false
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bootlinux_fragment_hardening: false
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bootlinux_fragment_kvm_guest: true
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bootlinux_fragment_xen: false
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bootlinux_fragment_rust: false
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# kdevops fragments
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bootlinux_fragment_64bit: true
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bootlinux_fragment_systemd: true
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bootlinux_fragment_distro: true
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bootlinux_fragment_storage: true
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bootlinux_fragment_virtio_fs: true
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bootlinux_fragment_numa: false
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bootlinux_fragment_modules: false
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bootlinux_fragment_initramfs: true
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bootlinux_fragment_ebpf: false
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bootlinux_fragment_gdb: false
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bootlinux_fragment_vm_debug: false
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bootlinux_fragment_localversion: false
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bootlinux_fragment_blktrace: false
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bootlinux_fragment_ksm: false
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# ARM64 page size (mutually exclusive choice)
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bootlinux_fragment_arm64_4k_pages: false
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bootlinux_fragment_arm64_16k_pages: false
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bootlinux_fragment_arm64_64k_pages: false
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# Additional kdevops fragments
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bootlinux_fragment_buffer_head: false
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bootlinux_fragment_ebpf_errorinj: false
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bootlinux_fragment_localauto: true
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bootlinux_fragment_moby: false
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bootlinux_fragment_modules_blk: false
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bootlinux_fragment_x86: false
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bootlinux_fragment_xarray: false
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bootlinux_fragment_xarray_no_multi: false
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‎playbooks/roles/bootlinux/tasks/build/9p.yml‎

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mode: "0644"
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run_once: true
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delegate_to: localhost
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when: not bootlinux_use_config_fragments|default(false)|bool
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- name: Use configuration fragments for Linux {{ target_linux_tree }} on the control node
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ansible.builtin.import_tasks: ../config-fragments.yml
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run_once: true
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delegate_to: localhost
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vars:
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target_linux_dir_path: "{{ bootlinux_9p_host_path }}"
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when:
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- bootlinux_use_config_fragments|default(false)|bool
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- name: Set kernel localversion if requested on the control node
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ansible.builtin.shell: "echo {{ active_linux_localversion | default(target_linux_localversion) }} > {{ bootlinux_9p_host_path }}/localversion"
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$ {{ ansible_callback_diy.result.output.cmd | join(' ') }}
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{{ ansible_callback_diy.result.output.stdout | default('') }}
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- name: Configure Linux {{ target_linux_tree }} on the control node
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- name: Configure kernel with oldconfig (9P build - monolithic config only)
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ansible.builtin.shell: |
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set -o pipefail
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yes "" | make oldconfig
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executable: /bin/bash
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run_once: true
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delegate_to: localhost
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when: not bootlinux_use_config_fragments|default(false)|bool
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vars:
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ansible_callback_diy_runner_on_ok_msg: |
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$ {{ ansible_callback_diy.result.output.cmd | join(' ') }}

‎playbooks/roles/bootlinux/tasks/build/builder.yml‎

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target: "olddefconfig"
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when:
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- bootlinux_compiler_gcc|bool
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- not bootlinux_use_config_fragments|default(false)|bool
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- name: Build {{ target_linux_tree }}
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community.general.make:
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target: "olddefconfig"
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when:
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- bootlinux_compiler_clang|bool
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- not bootlinux_use_config_fragments|default(false)|bool
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- name: Build {{ target_linux_tree }}
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community.general.make:

‎playbooks/roles/bootlinux/tasks/build/targets.yml‎

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owner: "{{ data_user }}"
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group: "{{ data_group }}"
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mode: "0644"
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when: not bootlinux_use_config_fragments|default(false)|bool
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- name: Use configuration fragments for Linux {{ target_linux_tree }} on target nodes
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ansible.builtin.import_tasks: ../config-fragments.yml
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when:
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- bootlinux_use_config_fragments|default(false)|bool
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- target_arch_arm64|default(false)|bool
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- name: Set kernel localversion if requested on the target nodes
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ansible.builtin.shell: "echo {{ target_linux_localversion }} > {{ target_linux_dir_path }}/localversion"
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args:
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chdir: "{{ target_linux_dir_path }}"
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executable: /bin/bash
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when: not bootlinux_use_config_fragments|default(false)|bool
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- name: Build {{ target_linux_tree }} on the target nodes
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ansible.builtin.shell: "{{ target_linux_make_cmd }}"

‎playbooks/roles/bootlinux/tasks/config-fragments.yml‎

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---
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# Kernel configuration using fragments with merge_config.sh
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- name: Initialize fragment list
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ansible.builtin.set_fact:
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fragment_list: []
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# Build fragment list for upstream kernel fragments
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- name: Add upstream fragments to list
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ansible.builtin.set_fact:
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fragment_list: "{{ fragment_list + [item.path] }}"
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loop:
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- { condition: "{{ bootlinux_fragment_tiny|default(false)|bool }}", path: "kernel/configs/tiny.config" }
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- { condition: "{{ bootlinux_fragment_nopm|default(false)|bool }}", path: "kernel/configs/nopm.config" }
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- { condition: "{{ bootlinux_fragment_debug|default(false)|bool }}", path: "kernel/configs/debug.config" }
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- { condition: "{{ bootlinux_fragment_hardening|default(false)|bool }}", path: "kernel/configs/hardening.config" }
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- { condition: "{{ bootlinux_fragment_kvm_guest|default(false)|bool }}", path: "kernel/configs/kvm_guest.config" }
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- { condition: "{{ bootlinux_fragment_xen|default(false)|bool }}", path: "kernel/configs/xen.config" }
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- { condition: "{{ bootlinux_fragment_rust|default(false)|bool }}", path: "kernel/configs/rust.config" }
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when: item.condition
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# Build fragment list for kdevops template fragments
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- name: Add kdevops template fragments to list
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ansible.builtin.set_fact:
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fragment_list: "{{ fragment_list + [role_path + '/templates/fragments/' + item.file] }}"
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loop:
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- { condition: "{{ bootlinux_fragment_64bit|default(false)|bool }}", file: "64bit.config" }
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- { condition: "{{ bootlinux_fragment_systemd|default(false)|bool }}", file: "systemd.config" }
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- { condition: "{{ bootlinux_fragment_distro|default(false)|bool }}", file: "distro.config" }
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- { condition: "{{ bootlinux_fragment_storage|default(false)|bool }}", file: "storage.config" }
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- { condition: "{{ bootlinux_fragment_virtio_fs|default(false)|bool }}", file: "virtio-fs.config" }
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- { condition: "{{ bootlinux_fragment_numa|default(false)|bool }}", file: "numa.config" }
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- { condition: "{{ bootlinux_fragment_modules|default(false)|bool }}", file: "modules.config" }
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- { condition: "{{ bootlinux_fragment_initramfs|default(false)|bool }}", file: "initramfs.config" }
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- { condition: "{{ bootlinux_fragment_ebpf|default(false)|bool }}", file: "ebpf.config" }
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- { condition: "{{ bootlinux_fragment_gdb|default(false)|bool }}", file: "gdb.config" }
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- { condition: "{{ bootlinux_fragment_vm_debug|default(false)|bool }}", file: "vm_debug.config" }
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- { condition: "{{ bootlinux_fragment_localversion|default(false)|bool }}", file: "localversion.config" }
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- { condition: "{{ bootlinux_fragment_blktrace|default(false)|bool }}", file: "blktrace.config" }
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- { condition: "{{ bootlinux_fragment_ksm|default(false)|bool }}", file: "ksm.config" }
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- { condition: "{{ bootlinux_fragment_arm64_4k_pages|default(false)|bool }}", file: "arm64_4k_pages.config" }
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- { condition: "{{ bootlinux_fragment_arm64_16k_pages|default(false)|bool }}", file: "arm64_16k_pages.config" }
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- { condition: "{{ bootlinux_fragment_arm64_64k_pages|default(false)|bool }}", file: "arm64_64k_pages.config" }
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- { condition: "{{ bootlinux_fragment_buffer_head|default(false)|bool }}", file: "buffer_head.config" }
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- { condition: "{{ bootlinux_fragment_ebpf_errorinj|default(false)|bool }}", file: "ebpf-errorinj.config" }
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- { condition: "{{ bootlinux_fragment_localauto|default(false)|bool }}", file: "localauto.config" }
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- { condition: "{{ bootlinux_fragment_moby|default(false)|bool }}", file: "moby.config" }
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- { condition: "{{ bootlinux_fragment_modules_blk|default(false)|bool }}", file: "modules-blk.config" }
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- { condition: "{{ bootlinux_fragment_x86|default(false)|bool }}", file: "x86.config" }
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- { condition: "{{ bootlinux_fragment_xarray|default(false)|bool }}", file: "xarray.config" }
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- { condition: "{{ bootlinux_fragment_xarray_no_multi|default(false)|bool }}", file: "xarray_no_multi.config" }
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when: item.condition
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- name: Display selected configuration fragments
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ansible.builtin.debug:
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msg: |
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Selected kernel configuration fragments ({{ fragment_list | length }} total):
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{{ fragment_list | join(' ') }}
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when: fragment_list | length > 0
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- name: Display warning if no fragments selected
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ansible.builtin.debug:
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msg: "WARNING: No configuration fragments were selected!"
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when: fragment_list | length == 0
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vars:
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ansible_callback_diy_runner_on_ok_msg: "{{ ansible_callback_diy.result.output.msg }}"
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# Apply fragments using merge_config.sh
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- name: Apply configuration fragments using merge_config.sh
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ansible.builtin.shell: >-
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{{ 'LLVM=1 ' if bootlinux_compiler_clang|default(false)|bool else '' }}./scripts/kconfig/merge_config.sh
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-n .config
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{{ fragment_list | join(' ') }}
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args:
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chdir: "{{ target_linux_dir_path }}"
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when: fragment_list | length > 0
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vars:
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ansible_callback_diy_runner_on_ok_msg: |
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$ {{ ansible_callback_diy.result.output.cmd }}
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{{ ansible_callback_diy.result.output.stdout | default('') }}

‎playbooks/roles/bootlinux/templates/fragments/64bit.config‎

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CONFIG_64BIT=y

‎playbooks/roles/bootlinux/templates/fragments/arm64_16k_pages.config‎

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CONFIG_ARM64_16K_PAGES=y

‎playbooks/roles/bootlinux/templates/fragments/arm64_4k_pages.config‎

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CONFIG_ARM64_4K_PAGES=y

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