bootloader: utilize grub2-common posttrans script for handling config…

… file generation

Our backend now executes the grub2-common posttrans script to generate
grub config files. This is an ugly hack, but still better than having
this logic on our side.
I requested that this logic get's extracted to some sanely reusable
helper scripts: https://bugzilla.redhat.com/show_bug.cgi?id=2327644

anaconda.spec.in

@@ -143,6 +143,8 @@ Requires: python3-pid
 Requires: crypto-policies
 Requires: crypto-policies-scripts
 
+Requires: grub2-common
+
 # required because of the rescue mode and RDP question
 Requires: anaconda-tui = %{version}-%{release}
 

pyanaconda/modules/storage/bootloader/efi.py

@@ -177,31 +177,6 @@ def efi_config_file(self):
         """ Full path to EFI configuration file. """
         return "%s/%s" % (self.efi_config_dir, self._config_file)
 
-    def write_config(self):
-        config_path = "%s%s" % (conf.target.system_root, self.efi_config_file)
-
-        with open(config_path, "w") as fd:
-            grub_dir = self.config_dir
-            if self.stage2_device.format.type != "btrfs":
-                fs_uuid = self.stage2_device.format.uuid
-            else:
-                fs_uuid = self.stage2_device.format.vol_uuid
-
-            if fs_uuid is None:
-                raise BootLoaderError("Could not get stage2 filesystem UUID")
-
-            grub_dir = util.execWithCapture("grub2-mkrelpath", [grub_dir],
-                                            root=conf.target.system_root)
-            if not grub_dir:
-                raise BootLoaderError("Could not get GRUB directory path")
-
-            fd.write("search --no-floppy --fs-uuid --set=dev %s\n" % fs_uuid)
-            fd.write("set prefix=($dev)%s\n" % grub_dir)
-            fd.write("export $prefix\n")
-            fd.write("configfile $prefix/grub.cfg\n")
-
-        super().write_config()
-
 
 class EFISystemdBoot(EFIBase, SystemdBoot):
     """EFI Systemd-boot"""

pyanaconda/modules/storage/bootloader/grub2.py

@@ -25,7 +25,7 @@
 from pyanaconda.core import util
 from pyanaconda.core.configuration.anaconda import conf
 from pyanaconda.core.i18n import _
-from pyanaconda.core.path import open_with_perm
+from pyanaconda.core.path import join_paths, open_with_perm
 from pyanaconda.core.product import get_product_name
 
 from pyanaconda.anaconda_loggers import get_module_logger
@@ -363,14 +363,23 @@ def write_config(self):
             if rc:
                 log.error("failed to set menu_auto_hide=1")
 
-        # now tell grub2 to generate the main configuration file
-        rc = util.execWithRedirect(
-            "grub2-mkconfig",
-            ["-o", self.config_file],
-            root=conf.target.system_root
-        )
+        # Executes the grub2-common posttrans script to generate grub config files
+        # This should be autohandled by grub2-common, but posttrans scriptlets
+        # in live image scenarios are not triggered.
+        # FIXME: https://bugzilla.redhat.com/show_bug.cgi?id=2327644
+
+        # Drop the first line as it's the posttrans scriptlet header
+        script = util.execWithCapture("rpm", ["-q", "--scripts", "grub2-common"], root=conf.target.system_root).splitlines()[1:]
+        script = "\n".join(script)
+
+        # Write the script to a temporary file in the chroot
+        with open(join_paths(conf.target.system_root, "/tmp/grub2-posttrans.sh"), "w") as f:
+            f.write(script)
+
+        # Run the script in the chroot
+        rc = util.execWithRedirect("/bin/sh", ["/tmp/grub2-posttrans.sh"], root=conf.target.system_root)
         if rc:
-            raise BootLoaderError("failed to write boot loader configuration")
+            raise BootLoaderError("grub2-common posttrans script failed")
 
     #
     # installation