From: "David C. Manuelda" <stormb...@gmail.com>
This feature will allow grub-mkconfig to be able to identify root
filesystem via label kernel parameter (root=LABEL=xxxx). To enable
this feature, UUIDs and PARTUUIDs needs to be disabled (with
GRUB_DISABLE_LINUX_UUID and GRUB_DISABLE_LINUX_PARTUUID set to true)
and the newly introduced variable GRUB_DISABLE_LINUX_LABEL set to false.
To maintain compatibility with older kernels and existing configs
the default value for GRUB_DISABLE_LINUX_LABEL is true so unless
this value is changed the current functionality is not affected.
Signed-off-by: David C. Manuelda <stormb...@gmail.com>
---
docs/grub.texi | 7 +++++++
util/grub-mkconfig.in | 2 ++
util/grub.d/10_linux.in | 29 +++++++++++++++++++++--------
3 files changed, 30 insertions(+), 8 deletions(-)
diff --git a/docs/grub.texi b/docs/grub.texi
index 2ea6c56d1..4ecb708ae 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -1499,6 +1499,13 @@ Linux device names. When
@samp{GRUB_DISABLE_LINUX_PARTUUID} is set to
the MSDOS partition scheme) or newer. This option defaults to @samp{true}. To
enable the use of partition UUIDs, set this option to @samp{false}.
+@item GRUB_DISABLE_LINUX_LABEL
+@command{grub-mkconfig} can pick labels to identify root filesystem to the
Linux
+kernel via a @samp{root=LABEL=...} kernel parameter. To enable it disable both
+@samp{GRUB_DISABLE_LINUX_UUID} and @samp{GRUB_DISABLE_LINUX_PARTUUID} with
+a @samp{true} value and set this option to @samp{false}. To maintain
compatibility
+with older kernels this option defaults to @samp{true}.
+
@item GRUB_DISABLE_RECOVERY
If this option is set to @samp{true}, disable the generation of recovery
mode menu entries.
diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
index 32c480dae..ed670ffcc 100644
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -202,6 +202,7 @@ if [ "x${GRUB_ACTUAL_DEFAULT}" = "xsaved" ] ; then
GRUB_ACTUAL_DEFAULT="`"${grub
export GRUB_DEVICE \
GRUB_DEVICE_UUID \
GRUB_DEVICE_PARTUUID \
+ GRUB_DEVICE_LABEL \
GRUB_DEVICE_BOOT \
GRUB_DEVICE_BOOT_UUID \
GRUB_DISABLE_OS_PROBER \
@@ -244,6 +245,7 @@ export GRUB_DEFAULT \
GRUB_DISABLE_UUID \
GRUB_DISABLE_LINUX_UUID \
GRUB_DISABLE_LINUX_PARTUUID \
+ GRUB_DISABLE_LINUX_LABEL \
GRUB_DISABLE_RECOVERY \
GRUB_VIDEO_BACKEND \
GRUB_GFXMODE \
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index cc393be7e..bc14056f2 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -45,24 +45,37 @@ esac
: ${GRUB_CMDLINE_LINUX_RECOVERY:=single}
-# Default to disabling partition uuid support to maintian compatibility with
+# Default to disabling partition uuid support to maintain compatibility with
# older kernels.
: ${GRUB_DISABLE_LINUX_PARTUUID=true}
+# Default to disabling partition label support to maintain compatibility with
+# older kernels.
+: ${GRUB_DISABLE_LINUX_LABEL=true}
+
# btrfs may reside on multiple devices. We cannot pass them as value of root=
parameter
# and mounting btrfs requires user space scanning, so force UUID in this case.
-if ( [ "x${GRUB_DEVICE_UUID}" = "x" ] && [ "x${GRUB_DEVICE_PARTUUID}" = "x" ]
) \
+if ( [ "x${GRUB_DEVICE_UUID}" = "x" ] && [ "x${GRUB_DEVICE_PARTUUID}" = "x" ]
&& [ "x${GRUB_DEVICE_LABEL}" = "x" ] ) \
|| ( [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
- && [ "x${GRUB_DISABLE_LINUX_PARTUUID}" = "xtrue" ] ) \
+ && [ "x${GRUB_DISABLE_LINUX_PARTUUID}" = "xtrue" ] \
+ && [ "x${GRUB_DISABLE_LINUX_LABEL}" = "xtrue" ] ) \
|| ( ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
- && ! test -e "/dev/disk/by-partuuid/${GRUB_DEVICE_PARTUUID}" ) \
+ && ! test -e "/dev/disk/by-partuuid/${GRUB_DEVICE_PARTUUID}" \
+ && ! test -e "/dev/disk/by-label/${GRUB_DEVICE_LABEL}" ) \
|| ( 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=${GRUB_DEVICE_UUID}
+ if ( [ "x${GRUB_DEVICE_UUID}" = "x" ] \
+ || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] ); then
+ if ( [ "x${GRUB_DEVICE_PARTUUID}" = "x" ] \
+ || [ "x${GRUB_DISABLE_LINUX_PARTUUID}" = "xtrue" ] ); then
+ LINUX_ROOT_DEVICE=LABEL=${GRUB_DEVICE_LABEL}
+ else
+ LINUX_ROOT_DEVICE=PARTUUID=${GRUB_DEVICE_PARTUUID}
+ fi
+ else
+ LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
+ fi
fi
case x"$GRUB_FS" in
--
2.46.2
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