kt vm: Pin Rocky repos to vault to prevent minor version drift

Without this, dnf resolves packages from the latest minor release
instead of the one the image was built with.

- Disable mirrorlist to stop dnf from redirecting to the latest minor version
- Point baseurl to the Rocky vault where old minor versions are permanently hosted
- Replace $releasever with the actual VERSION_ID from /etc/os-release to pin to the exact minor version
- Clear dnf cache to force metadata refresh from the new vault URLs

All of these were added in kt/data/cloud-init.yaml that is the base
for all vms. When kt vm is run the first time for a kernel workspace,
a copy of cloud-init.yaml is created. Use ruamel instead so that comments
and the original formatting stays the same when the yaml file is read
and then dump in python.

Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>

add to a8edde3

Author: PlaidCat

kt/data/cloud_init.yaml

@@ -15,8 +15,14 @@ ssh_pwauth: true
 package_upgrade: False
 
 mounts:
-  - ["mount_tag_mock_scratch", "SHARED_DIR_PLACEHOLDER", "virtiofs", "rw,relatime,context=unconfined_u:object_r:mock_var_lib_t:s0"]
-  - ["SHARED_DIR_PLACEHOLDER", "/var/lib/mock", "bind", "defaults,bind"]
+  - - mount_tag_mock_scratch
+    - SHARED_DIR_PLACEHOLDER
+    - virtiofs
+    - rw,relatime,context=unconfined_u:object_r:mock_var_lib_t:s0
+  - - SHARED_DIR_PLACEHOLDER
+    - /var/lib/mock
+    - bind
+    - defaults,bind
 
 # Change working directory after boot
 # Setting up homedir does not work without tricks, because
@@ -32,7 +38,9 @@ write_files:
 # and then root is the owner
 # workaround to change the owner to user
 runcmd:
-  - [chown, USER_PLACEHOLDER:USER_PLACEHOLDER, HOMEDIR_PLACEHOLDER]
+  - - chown
+    - USER_PLACEHOLDER:USER_PLACEHOLDER
+    - HOMEDIR_PLACEHOLDER
 
 power_state:
   mode: reboot

kt/ktlib/vm.py

@@ -5,10 +5,10 @@
 import time
 from dataclasses import dataclass
 
-import oyaml as yaml
 import wget
 from git import Repo
 from pathlib3x import Path
+from ruamel.yaml import YAML
 
 from urllib.parse import urlparse
 
@@ -187,9 +187,15 @@ def _download_source_image(self, override_base: bool = False):
         wget.download(self._get_vm_url(), out=str(self.qcow2_source_path))
 
     def _setup_cloud_init(self, config: Config):
+        yaml = YAML()
+        yaml.preserve_quotes = True
+        yaml.width = 4096
+        yaml.default_flow_style = False
+        yaml.best_sequence_indent = 2
+
         data = None
         with open(CLOUD_INIT_BASE_PATH) as f:
-            data = yaml.safe_load(f)
+            data = yaml.load(f)
 
         # replace placeholders with user data
         data["users"][0]["name"] = config.user
@@ -238,7 +244,6 @@ def _setup_cloud_init(self, config: Config):
         data["runcmd"].append([str(config.base_path / Path("kernel-src-tree-tools") / Path("kernel_install_dep.sh"))])
         # Write this to image cloud_init
         with open(self.cloud_init_path, "w") as f:
-            f.write("#cloud-config\n")
             yaml.dump(data, f)
 
     def _create_image(self, config: Config, vcpus: int = 12, memory: int = 32768):

pyproject.toml

@@ -9,7 +9,8 @@ dependencies = [
 	"click",
 	"pathlib3x",
 	"python3-wget",
-	"oyaml",
+	"ruamel.yaml",
+	"pyyaml",
 	"pexpect",
 	"jira",
 	"requests",