sys-boot/grub: Move to portage-stable, bump to 2.12

.github/workflows/portage-stable-packages-list

@@ -609,6 +609,7 @@ sys-block/thin-provisioning-tools
 
 sys-boot/efibootmgr
 sys-boot/gnu-efi
+sys-boot/grub
 sys-boot/mokutil
 
 sys-devel/bc

changelog/updates/2024-09-06-grub-2.12.md

@@ -0,0 +1 @@
+- grub ([2.12](https://lists.gnu.org/archive/html/grub-devel/2023-12/msg00052.html))

sdk_container/src/third_party/coreos-overlay/coreos/config/env/sys-boot/grub

@@ -1,14 +1,14 @@
-PKG_INSTALL_MASK+=" /etc/grub.d/00_header
-                    /etc/grub.d/10_linux
-                    /etc/grub.d/30_os-prober
-                    /etc/grub.d/40_custom
-                    /etc/grub.d/README
-                    /lib64/grub/grub-mkconfig_lib
-                    /lib64/grub/update-grub_lib"
-INSTALL_MASK+=" /etc/grub.d/00_header
-                /etc/grub.d/10_linux
-                /etc/grub.d/30_os-prober
-                /etc/grub.d/40_custom
-                /etc/grub.d/README
-                /lib64/grub/grub-mkconfig_lib
-                /lib64/grub/update-grub_lib"
+# Replace Gentoo's SBAT with Flatcar's.
+cros_post_src_install_sbat() {
+	insinto /usr/share/grub
+	newins - sbat.csv <<-EOF
+		sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
+		grub,4,Free Software Foundation,grub,${PV},https://www.gnu.org/software/grub/
+		grub.flatcar,1,Flatcar,grub2,${PVR},https://github.com/flatcar/Flatcar
+	EOF
+}
+
+# Flatcar does not use grub-install or grub-mkconfig. All the files under /etc
+# relate to grub-mkconfig.
+INSTALL_MASK+=" ${EPREFIX}/etc/ *grub-install* *mkconfig*"
+PKG_INSTALL_MASK+=" ${EPREFIX}/etc/ *grub-install* *mkconfig*"

sdk_container/src/third_party/coreos-overlay/sys-boot/grub/README.md → sdk_container/src/third_party/coreos-overlay/coreos/user-patches/sys-boot/grub/README.md

@@ -1,5 +1,5 @@
 Flatcar uses a patched version of the GRUB, which implements the functionality to
-read the [Flatcar Container Linux partition table](https://www.flatcar.org/docs/latest/reference/developer-guides/sdk-disk-partitions/#partition-table)
+read the [Flatcar Container Linux partition table](https://www.flatcar.org/docs/latest/reference/developer-guides/sdk-disk-partitions/#partition-table).
 
 ## History
 
@@ -11,14 +11,11 @@ and referenced in the Flatcar's coreos-overlay. Except for a few, now many chang
 where brought into the system.
 
 The repo was maintained at 2.02 version. During the 2.06 migration, the philosophy
-to use a separate repo was scraped, and a single patch file was created. The patch
+to use a separate repo was scrapped, and two patch files were created. The patch
 files migrated only the essential commits, and dropped all the other commits, which
-were either half-baked, or redundant at the point of migration. The two patches are applied
-on top of the grub sources, and emerge is done.
+were either half-baked, or redundant at the point of migration.
 
-Given below are the list of commits that were referenced to create the two patches.
-
-## Summary of the patches
+## Summary of the Flatcar patches
 
 The patch starts with adding a new implementation of reading the GPT instead
 of using the traditional module. It provides essential functionality to interact
@@ -33,9 +30,9 @@ partition booting. The `gptrepair` command implements the repair functions for
 GPT information on a specified device. Few other functions include searching
 devices by partition label or partition UUID.
 
-## Commits
+## Commits in the Flatcar patches
 
-Below are the commits that are picked to create the two patches for the grub. One is
+Below are the commits that are picked to create the two Flatcar patches. One is
 descriptive, and other is comprehensive.
 
 <details>