[RFC PATCH 1/3] Add a guest/instance for building the test kernel

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

Provision a separate guest/instance for the purpose of building
the Linux kernel under test. It's not used yet.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 playbooks/roles/gen_hosts/defaults/main.yml   |  2 ++
 playbooks/roles/gen_hosts/tasks/main.yml      | 12 ++++++++++
 .../roles/gen_hosts/templates/builder.j2      | 13 +++++++++++
 playbooks/roles/gen_nodes/defaults/main.yml   |  2 ++
 playbooks/roles/gen_nodes/tasks/main.yml      | 22 +++++++++++++++++++
 workflows/linux/Kconfig                       | 10 +++++++++
 workflows/linux/Makefile                      |  4 ++++
 7 files changed, 65 insertions(+)
 create mode 100644 playbooks/roles/gen_hosts/templates/builder.j2

diff --git a/playbooks/roles/gen_hosts/defaults/main.yml b/playbooks/roles/gen_hosts/defaults/main.yml
index f6ab9bcce166..85afb35040e3 100644
--- a/playbooks/roles/gen_hosts/defaults/main.yml
+++ b/playbooks/roles/gen_hosts/defaults/main.yml
@@ -29,6 +29,8 @@ kdevops_workflow_enable_ltp: False
 kdevops_workflow_enable_nfstest: false
 kdevops_workflow_enable_sysbench: false
 
+bootlinux_builder: false
+
 is_fstests: False
 fstests_fstyp: "bogus"
 fs_config_role_path: "/dev/null"
diff --git a/playbooks/roles/gen_hosts/tasks/main.yml b/playbooks/roles/gen_hosts/tasks/main.yml
index a50355f72160..9182ac46f8c1 100644
--- a/playbooks/roles/gen_hosts/tasks/main.yml
+++ b/playbooks/roles/gen_hosts/tasks/main.yml
@@ -56,6 +56,18 @@
   when:
     - is_fstests
 
+- name: Generate the Ansible hosts file for a Linux kernel build
+  tags: [ 'hosts' ]
+  template:
+    src: "{{ kdevops_hosts_template }}"
+    dest: "{{ topdir_path }}/{{ kdevops_hosts }}"
+    force: yes
+    trim_blocks: True
+    lstrip_blocks: True
+  when:
+    - bootlinux_builder
+    - ansible_hosts_template.stat.exists
+
 - name: Generate the Ansible hosts file
   tags: [ 'hosts' ]
   template:
diff --git a/playbooks/roles/gen_hosts/templates/builder.j2 b/playbooks/roles/gen_hosts/templates/builder.j2
new file mode 100644
index 000000000000..0c9ba1e8e01a
--- /dev/null
+++ b/playbooks/roles/gen_hosts/templates/builder.j2
@@ -0,0 +1,13 @@
+[all]
+{{ kdevops_hosts_prefix }}-builder
+[all:vars]
+ansible_python_interpreter =  "{{ kdevops_python_interpreter }}"
+
+[baseline]
+{{ kdevops_hosts_prefix }}-builder
+[baseline:vars]
+ansible_python_interpreter =  "{{ kdevops_python_interpreter }}"
+
+[dev]
+[dev:vars]
+ansible_python_interpreter =  "{{ kdevops_python_interpreter }}"
diff --git a/playbooks/roles/gen_nodes/defaults/main.yml b/playbooks/roles/gen_nodes/defaults/main.yml
index 8ff9b87993a7..d5fa444c995f 100644
--- a/playbooks/roles/gen_nodes/defaults/main.yml
+++ b/playbooks/roles/gen_nodes/defaults/main.yml
@@ -93,6 +93,8 @@ fstests_fstyp: "bogus"
 fs_config_role_path: "/dev/null"
 fs_config_data: "[section_1]"
 
+bootlinux_builder: false
+builder_nodes: []
 bootlinux_9p: False
 bootlinux_9p_host_path: "/dev/null"
 bootlinux_9p_msize: 0
diff --git a/playbooks/roles/gen_nodes/tasks/main.yml b/playbooks/roles/gen_nodes/tasks/main.yml
index d541dcbf1f54..e3d0127d1f65 100644
--- a/playbooks/roles/gen_nodes/tasks/main.yml
+++ b/playbooks/roles/gen_nodes/tasks/main.yml
@@ -43,6 +43,14 @@
   when:
     - kdevops_baseline_and_dev
 
+- name: Set builder nodes array
+  tags: vars
+  set_fact:
+    builder_nodes:
+      - "{{ kdevops_host_prefix + '-builder' }}"
+  when:
+    - bootlinux_builder
+
 - name: Set iscsi_nodes list
   ansible.builtin.set_fact:
     iscsi_nodes: "{{ [kdevops_host_prefix + '-iscsi'] }}"
@@ -138,6 +146,20 @@
     - not kdevops_workflows_dedicated_workflow
     - ansible_nodes_template.stat.exists
 
+- name: Generate the builder kdevops nodes file using {{ kdevops_nodes_template }} as jinja2 source template
+  tags: [ 'nodes' ]
+  vars:
+    node_template: "{{ kdevops_nodes_template | basename }}"
+    all_generic_nodes: "{{ builder_nodes }}"
+    nodes: "{{ all_generic_nodes }}"
+  template:
+    src: "{{ node_template }}"
+    dest: "{{ topdir_path }}/{{ kdevops_nodes }}"
+    force: yes
+  when:
+    - bootlinux_builder
+    - ansible_nodes_template.stat.exists
+
 - name: Generate the pynfs kdevops nodes file using {{ kdevops_nodes_template }} as jinja2 source template
   tags: [ 'nodes' ]
   vars:
diff --git a/workflows/linux/Kconfig b/workflows/linux/Kconfig
index 797469e60d20..8a26eb2e2897 100644
--- a/workflows/linux/Kconfig
+++ b/workflows/linux/Kconfig
@@ -36,6 +36,16 @@ config BOOTLINUX_PURE_IOMAP
 
 endif # HAVE_SUPPORTS_PURE_IOMAP
 
+config BOOTLINUX_BUILDER
+	bool "Build once, test many"
+	output yaml
+	default n
+	help
+	  Enabling this option creates a separate guest/instance
+	  where the Linux kernel is built. kdevops passes the
+	  artifacts of this build to the test runner nodes to be
+	  installed before each workflow runs.
+
 config BOOTLINUX_9P
 	bool "Use 9p to build Linux"
 	depends on LIBVIRT && !GUESTFS_LACKS_9P
diff --git a/workflows/linux/Makefile b/workflows/linux/Makefile
index ecce273a4f67..65bbb8ae9a90 100644
--- a/workflows/linux/Makefile
+++ b/workflows/linux/Makefile
@@ -13,6 +13,10 @@ ifeq (y,$(CONFIG_BOOTLINUX_PURE_IOMAP))
 TREE_CONFIG:=config-$(TREE_REF)-pure-iomap
 endif
 
+ifeq (y,$(CONFIG_BOOTLINUX_BUILDER))
+KDEVOPS_HOSTS_TEMPLATE=builder.j2
+endif
+
 # Describes the Linux clone
 BOOTLINUX_ARGS	+= target_linux_git=$(TREE_URL)
 # ifeq (y,$(CONFIG_BOOTLINUX_TREE_CUSTOM_NAME))
-- 
2.49.0