[PATCH 30/40] Add a guest/instance for building the test kernel

[Luis Chamberlain <mcgrof@kernel.org>]

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

Provision a separate guest/instance for the purpose of building the
Linux kernel under test. This builder guest is 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   |  3 +++
 playbooks/roles/gen_nodes/tasks/main.yml      | 22 +++++++++++++++++++
 workflows/linux/Kconfig                       | 14 ++++++++++++
 workflows/linux/Makefile                      |  4 ++++
 7 files changed, 70 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 1cf906d3..d9479552 100644
--- a/playbooks/roles/gen_hosts/defaults/main.yml
+++ b/playbooks/roles/gen_hosts/defaults/main.yml
@@ -41,3 +41,5 @@ kdevops_loopback_nfs_enable: False
 kdevops_smbd_enable: False
 kdevops_krb5_enable: False
 kdevops_enable_iscsi: false
+
+bootlinux_builder: false
diff --git a/playbooks/roles/gen_hosts/tasks/main.yml b/playbooks/roles/gen_hosts/tasks/main.yml
index 58ebd1d4..70d543ad 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 00000000..0c9ba1e8
--- /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 3368cf61..6aed5303 100644
--- a/playbooks/roles/gen_nodes/defaults/main.yml
+++ b/playbooks/roles/gen_nodes/defaults/main.yml
@@ -86,6 +86,7 @@ kdevops_workflows_dedicated_workflow: False
 kdevops_workflow_enable_fstests: False
 kdevops_workflow_enable_blktests: False
 
+builder_nodes: []
 iscsi_nodes: []
 
 is_fstests: False
@@ -101,6 +102,8 @@ bootlinux_9p_mount_tag: "ignore"
 bootlinux_9p_security_model: "none"
 bootlinux_9p_driver: "virtio-9p-pci"
 
+bootlinux_builder: false
+
 guestfs_requires_uefi: False
 
 kdevops_workflow_enable_sysbench: False
diff --git a/playbooks/roles/gen_nodes/tasks/main.yml b/playbooks/roles/gen_nodes/tasks/main.yml
index ebaba927..ae017ee8 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 27cba0a9..31f57017 100644
--- a/workflows/linux/Kconfig
+++ b/workflows/linux/Kconfig
@@ -77,6 +77,20 @@ config BOOTLINUX_9P
 	  However, 9p is available only when using a local
 	  virtualization method such as libvirt.
 
+config BOOTLINUX_BUILDER
+	bool "Separate kernel builder"
+	output yaml
+	help
+	  Enabling this option brings up a separate guest/instance
+	  for building the Linux kernel to test. The new kernel is
+	  packaged appropriately for installation on other systems,
+	  but is not installed. Once the kernel is built, the kernel
+	  packages are saved on the controller host and the builder
+	  node can be destroyed.
+
+	  This choice is best when the test runners are resource-
+	  limited or vastly different than the controller host.
+
 endchoice
 
 if BOOTLINUX_9P
diff --git a/workflows/linux/Makefile b/workflows/linux/Makefile
index f5bc6490..01e3d3e4 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))
-- 
2.47.2