grub2/0007-grub-switch-to-blscfg-adapt-to-openSUSE.patch

From 855b3e5cd4d672e961a366ff0f53e3a09a1ad0cc Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Fri, 30 Jun 2023 14:37:41 +0800
Subject: [PATCH 7/9] grub-switch-to-blscfg: adapt to openSUSE

A few tweaks to make it 'just works' for openSUSE:

- remove RHEL specific $grub_get_kernel_settings and all reference to it.
- make $grubdir and $startlink to the path in openSUSE
- change the bls template to openSUSE
- make $cmdline account for btrfs subvolumes, among others
- remove RHEL specific $GRUB_LINUX_MAKE_DEBUG and all related code
- remove ostree specific hack
- ignore increment.mod

Signed-off-by: Michael Chang <mchang@suse.com>
---
 util/grub-switch-to-blscfg.in | 144 ++++++++++++++++++++--------------
 1 file changed, 87 insertions(+), 57 deletions(-)

diff --git a/util/grub-switch-to-blscfg.in b/util/grub-switch-to-blscfg.in
index a851424be..66ecc0cae 100644
--- a/util/grub-switch-to-blscfg.in
+++ b/util/grub-switch-to-blscfg.in
@@ -34,21 +34,18 @@ fi
 
 self=`basename $0`
 
-grub_get_kernel_settings="${sbindir}/@grub_get_kernel_settings@"
 grub_editenv=${bindir}/@grub_editenv@
-etcdefaultgrub=/etc/default/grub
+grub_probe="${sbindir}/@grub_probe@"
+etcdefaultgrub=${sysconfdir}/default/grub
 
-eval "$("${grub_get_kernel_settings}")" || true
-
-EFIDIR=$(grep ^ID= /etc/os-release | sed -e 's/^ID=//' -e 's/rhel/redhat/' -e 's/\"//g')
-if [ -d /sys/firmware/efi/efivars/ ]; then
-    startlink=/etc/grub2-efi.cfg
-    grubdir=`echo "/@bootdirname@/efi/EFI/${EFIDIR}/" | sed 's,//*,/,g'`
-else
-    startlink=/etc/grub2.cfg
-    grubdir=`echo "/@bootdirname@/@grubdirname@" | sed 's,//*,/,g'`
+if test -f "$etcdefaultgrub" ; then
+    # shellcheck source=/etc/default/grub
+    . "$etcdefaultgrub"
 fi
 
+grubdir=`echo "/@bootdirname@/@grubdirname@" | sed 's,//*,/,g'`
+startlink="${grubdir}/grub.cfg"
+
 blsdir=`echo "/@bootdirname@/loader/entries" | sed 's,//*,/,g'`
 
 backupsuffix=.bak
@@ -58,19 +55,80 @@ arch="$(uname -m)"
 export TEXTDOMAIN=@PACKAGE@
 export TEXTDOMAINDIR="@localedir@"
 
+# shellcheck source=/usr/share/grub2/grub-mkconfig_lib
 . "${pkgdatadir}/grub-mkconfig_lib"
 
+# FIXME: Abort if grub_probe fails
+
+GRUB_DEVICE="`${grub_probe} --target=device /`"
+GRUB_DEVICE_UUID="`${grub_probe} --device ${GRUB_DEVICE} --target=fs_uuid 2> /dev/null`" || true
+GRUB_DEVICE_PARTUUID="`${grub_probe} --device ${GRUB_DEVICE} --target=partuuid 2> /dev/null`" || true
+GRUB_FS="`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2> /dev/null || echo unknown`"
+
+# loop-AES arranges things so that /dev/loop/X can be our root device, but
+# the initrds that Linux uses don't like that.
+case ${GRUB_DEVICE} in
+  /dev/loop/*|/dev/loop[0-9])
+    GRUB_DEVICE=$(losetup "${GRUB_DEVICE}" | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/")
+  ;;
+esac
+
+# Default to disabling partition uuid support to maintian compatibility with
+# older kernels.
+GRUB_DISABLE_LINUX_PARTUUID=${GRUB_DISABLE_LINUX_PARTUUID-true}
+
+# btrfs may reside on multiple devices. We cannot pass them as value of root= parameter
+# and mounting btrfs requires user space scanning, so force UUID in this case.
+if ( [ "x${GRUB_DEVICE_UUID}" = "x" ] && [ "x${GRUB_DEVICE_PARTUUID}" = "x" ] ) \
+    || ( [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
+	&& [ "x${GRUB_DISABLE_LINUX_PARTUUID}" = "xtrue" ] ) \
+    || ( ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
+	&& ! test -e "/dev/disk/by-partuuid/${GRUB_DEVICE_PARTUUID}" ) \
+    || ( test -e "${GRUB_DEVICE}" && uses_abstraction "${GRUB_DEVICE}" lvm ); then
+  LINUX_ROOT_DEVICE=${GRUB_DEVICE}
+elif [ "x${GRUB_DEVICE_UUID}" = "x" ] \
+    || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ]; then
+  LINUX_ROOT_DEVICE=PARTUUID=${GRUB_DEVICE_PARTUUID}
+else
+  LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
+fi
+
+if [ "x$GRUB_CONMODE" != "x" ]; then
+  GRUB_CMDLINE_LINUX="conmode=${GRUB_CONMODE} ${GRUB_CMDLINE_LINUX}"
+fi
+
+case x"$GRUB_FS" in
+    xbtrfs)
+	if [ "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" != "xtrue" ]; then
+	    rootsubvol="`make_system_path_relative_to_its_root /`"
+	    rootsubvol="${rootsubvol#/}"
+	    if [ "x${rootsubvol}" != x ] && [ "x$SUSE_REMOVE_LINUX_ROOT_PARAM" != "xtrue" ]; then
+	        GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
+	    fi
+	fi
+	;;
+    xzfs)
+	rpool=`${grub_probe} --device ${GRUB_DEVICE} --target=fs_label 2>/dev/null || true`
+	bootfs="`make_system_path_relative_to_its_root / | sed -e "s,@$,,"`"
+	LINUX_ROOT_DEVICE="ZFS=${rpool}${bootfs%/}"
+	;;
+esac
+
+if [ "x$SUSE_REMOVE_LINUX_ROOT_PARAM" = "xtrue" ]; then
+  LINUX_ROOT_DEVICE=""
+fi
+
 # Usage: usage
 # Print the usage.
 usage () {
     gettext_printf "Usage: %s\n" "$self"
-    gettext "Switch to BLS config files.\n"; echo
+    gettext "Switch to BLS config files. Only for testing purpose !!!\n"; echo
     echo
     print_option_help "-h, --help" "$(gettext "print this message and exit")"
     print_option_help "-V, --version" "$(gettext "print the version information and exit")"
     echo
     print_option_help "--backup-suffix=$(gettext "SUFFIX")" "$backupsuffix"
-    print_option_help "--bls-directory=$(gettext "DIR")" "$blsdir"
+    print_option_help "--bls-directory=$(gettext "DIR")" "Noop, always $blsdir"
     print_option_help "--config-file=$(gettext "FILE")" "$startlink"
     print_option_help "--grub-defaults=$(gettext "FILE")" "$etcdefaultgrub"
     print_option_help "--grub-directory=$(gettext "DIR")" "$grubdir"
@@ -112,11 +170,15 @@ do
         ;;
 
     --bls-directory)
-        blsdir=`argument $option "$@"`
+        # blsdir=`argument $option "$@"`
+        gettext_printf "WARN: --bls-directory is currently disabled, it's always $blsdir !!!\n"
+        gettext_printf "WARN: use kernel-install instead if you want to test bls directory on ESP !!!\n"
         shift
         ;;
     --bls-directory=*)
-        blsdir=`echo "$option" | sed 's/--bls-directory=//'`
+        # blsdir=`echo "$option" | sed 's/--bls-directory=//'`
+        gettext_printf "WARN: --bls-directory is currently disabled, it's always $blsdir !!!\n"
+        gettext_printf "WARN: use kernel-install instead if you want to test bls directory on ESP !!!\n"
         ;;
 
     --config-file)
@@ -172,7 +234,7 @@ find_grub_cfg() {
     return 1
 }
 
-if ! find_grub_cfg ${startlink} ${grubdir}/grub.cfg ; then
+if ! find_grub_cfg "${startlink}" ; then
   gettext_printf "Couldn't find config file\n" 1>&2
   exit 1
 fi
@@ -190,27 +252,22 @@ fi
 mkbls() {
     local kernelver=$1 && shift
     local datetime=$1 && shift
+    local prefix=$1 && shift
     local kernelopts=$1 && shift
 
-    local debugname=""
-    local debugid=""
     local flavor=""
 
     if [ "$kernelver" == *\+* ] ; then
         local flavor=-"${kernelver##*+}"
-        if [ "${flavor}" == "-debug" ]; then
-            local debugname=" with debugging"
-            local debugid="-debug"
-        fi
     fi
     (
         source /etc/os-release
 
         cat <<EOF
-title ${NAME} (${kernelver}) ${VERSION}${debugname}
-version ${kernelver}${debugid}
-linux /vmlinuz-${kernelver}
-initrd /initramfs-${kernelver}.img
+title ${NAME} (${kernelver}) ${VERSION}
+version ${kernelver}$
+linux ${prefix}/vmlinuz-${kernelver}
+initrd ${prefix}/initrd-${kernelver}
 options ${kernelopts}
 grub_users \$grub_users
 grub_arg --unrestricted
@@ -233,42 +290,15 @@ copy_bls() {
             continue
 	fi
 
-	linux_relpath="$("${grub_mkrelpath}" "${linux_path}")"
-	bootprefix="${linux_relpath%%"${linux}"}"
+	bootprefix="$(make_system_path_relative_to_its_root /boot)"
 	cmdline="root=${LINUX_ROOT_DEVICE} ro ${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
 
 	mkbls "${kernelver}" \
 	      "$(date -u +%Y%m%d%H%M%S -d "$(stat -c '%y' "${kernel_dir}")")" \
 	      "${bootprefix}" "${cmdline}" >"${bls_target}"
-
-	if [ "x$GRUB_LINUX_MAKE_DEBUG" = "xtrue" ]; then
-            bls_debug="$(echo ${bls_target} | sed -e "s/${kernelver}/${kernelver}~debug/")"
-            cp -aT  "${bls_target}" "${bls_debug}"
-            title="$(grep '^title[ \t]' "${bls_debug}" | sed -e 's/^title[ \t]*//')"
-            options="$(echo "${cmdline} ${GRUB_CMDLINE_LINUX_DEBUG}" | sed -e 's/\//\\\//g')"
-            sed -i -e "s/^title.*/title ${title}${GRUB_LINUX_DEBUG_TITLE_POSTFIX}/" "${bls_debug}"
-            sed -i -e "s/^options.*/options ${options}/" "${bls_debug}"
-	fi
     done
-
-    if [ -f "/boot/vmlinuz-0-rescue-${MACHINE_ID}" ]; then
-	mkbls "0-rescue-${MACHINE_ID}" "0" "${bootprefix}" >"${blsdir}/${MACHINE_ID}-0-rescue.conf"
-    fi
 }
 
-# The grub2 EFI binary is not copied to the ESP as a part of an ostree
-# transaction. Make sure a grub2 version with BLS support is installed
-# but only do this if the blsdir is not set, to make sure that the BLS
-# parsing module will search for the BLS snippets in the default path.
-if test -f /run/ostree-booted && test -d /sys/firmware/efi/efivars && \
-   ! ${grub_editenv} - list | grep -q blsdir && \
-   mountpoint -q /boot; then
-    grub_binary="$(find /usr/lib/ostree-boot/efi/EFI/${EFIDIR}/ -name grub*.efi)"
-    install -m 700 ${grub_binary} ${grubdir} || exit 1
-    # Create a hidden file to indicate that grub2 now has BLS support.
-    touch /boot/grub2/.grub2-blscfg-supported
-fi
-
 GENERATE=0
 if grep '^GRUB_ENABLE_BLSCFG=.*' "${etcdefaultgrub}" \
         | grep -vq '^GRUB_ENABLE_BLSCFG="*true"*\s*$' ; then
@@ -297,9 +327,7 @@ if [ "${GENERATE}" -eq 1 ] ; then
     fi
 
     if [ -n "${mod_dir}" ]; then
-	for mod in blscfg increment; do
-	    install -m 700 ${prefix}/lib/grub/${mod_dir}/${mod}.mod ${grubdir}/$mod_dir/ || exit 1
-	done
+	install -m 700 "${pkgdatadir}/${mod_dir}/blscfg.mod" "${grubdir}/$mod_dir/" || exit 1
     fi
 
     cp -af "${GRUB_CONFIG_FILE}" "${GRUB_CONFIG_FILE}${backupsuffix}"
@@ -311,6 +339,8 @@ if [ "${GENERATE}" -eq 1 ] ; then
         gettext_printf "Updating %s failed\n" "${GRUB_CONFIG_FILE}"
         exit 1
     fi
+else
+    gettext_printf "Do nothing because \$GRUB_ENABLE_BLSCFG is already true in %s\n" "${GRUB_CONFIG_FILE}"
 fi
 
 # Bye.
-- 
2.44.0