improve exception handling for zfs

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

Author: desultory

src/ugrd/kmod/kmod.py

@@ -516,17 +516,19 @@ def process_ignored_module(self, module: str) -> None:
     for key in ["kmod_init", "kernel_modules", "_kmod_auto"]:
         if module in self[key]:
             if key == "kmod_init":
-                modinfo = _get_kmod_info(self, module)
-                if modinfo["filename"] == "(builtin)":
-                    self.logger.debug("Removing built-in module from kmod_init: %s" % module)
-                elif module == "zfs":
-                    self.logger.critical("ZFS module is required but missing.")
-                    self.logger.critical("Please build/install the required kmods before running this script.")
-                    self.logger.critical("Detected kernel version: %s" % self["kernel_version"])
-                    # https://github.com/projg2/installkernel-gentoo/commit/1c70dda8cd2700e5306d2ed74886b66ad7ccfb42
-                    exit(77)
-                else:
-                    raise MissingModuleError("Required module cannot be imported and is not builtin: %s" % module)
+                try:
+                    modinfo = _get_kmod_info(self, module)
+                    if modinfo["filename"] == "(builtin)":
+                        self.logger.debug("Removing built-in module from kmod_init: %s" % module)
+                except DependencyResolutionError:
+                    if module == "zfs":
+                        self.logger.critical("ZFS module is required but missing.")
+                        self.logger.critical("Please build/install the required kmods before running this script.")
+                        self.logger.critical("Detected kernel version: %s" % self["kernel_version"])
+                        # https://github.com/projg2/installkernel-gentoo/commit/1c70dda8cd2700e5306d2ed74886b66ad7ccfb42
+                        exit(77)
+                    else:
+                        raise MissingModuleError("Required module cannot be imported and is not builtin: %s" % module)
             else:
                 self.logger.debug("Removing ignored kernel module from %s: %s" % (key, module))
             self[key].remove(module)