check that the build time kernel version matches the runtime kver

Signed-off-by: Zen <[email protected]>

Author: desultory

src/ugrd/kmod/kmod.py

@@ -1,5 +1,5 @@
 __author__ = "desultory"
-__version__ = "4.1.0"
+__version__ = "4.2.0"
 
 from pathlib import Path
 from platform import uname
@@ -624,6 +624,17 @@ def process_modules(self) -> None:
             self.logger.warning("[%s] Failed to process autodetected kernel module dependencies: %s" % (kmod, e))
         self["kmod_ignore"] = kmod
 
+@contains("kernel_version", "Kernel version is not set, skipping kernel version check.", log_level=30)
+def check_kver(self) -> str:
+    """ Returns shell lines to check that the defined kernel version matches the running kernel version."""
+    return f"""
+    running_kver=$(awk '{{print $3}}' /proc/version)
+    if [[ "$running_kver" != "{self['kernel_version']}" ]]; then
+        eerror "Running kernel version ($running_kver) does not match the defined kernel version ({self['kernel_version']})"
+        eerror "Please ensure the correct kernel version is being booted."
+    fi
+    """
+
 
 @contains("kmod_init", "No kernel modules to load.", log_level=30)
 def load_modules(self) -> str:

src/ugrd/kmod/kmod.toml

@@ -40,4 +40,4 @@ kmod_no_normalize = "NoDupFlatList" # Kernel modules to not normalize (i.e. not
 "ugrd.kmod.kmod" = [ "regen_kmod_metadata" ]
 
 [imports.init_pre]
-"ugrd.kmod.kmod" = [ "load_modules" ]
+"ugrd.kmod.kmod" = [ "check_kver", "load_modules" ]