initramfs-framework: support PARTLABEL option

Since commit (kernel >= 4.20):
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f027c34d844013d9d6c902af8fa01a82d6e5073d
specifying rootfs by PARTLABEL is supported. This commit adds support to
specify root by GPT partition label.

(From OE-Core rev: ebc974be12c3e83e961c99c24fde267d6c8e8bfc)

Signed-off-by: Diego Rondini <diego.rondini@kynetics.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/meta/recipes-core/initrdscripts/initramfs-framework/rootfs b/meta/recipes-core/initrdscripts/initramfs-framework/rootfs
index f8c73b9726..748c9391c0 100644
--- a/meta/recipes-core/initrdscripts/initramfs-framework/rootfs
+++ b/meta/recipes-core/initrdscripts/initramfs-framework/rootfs
@@ -36,6 +36,11 @@ rootfs_run() {
                                 bootparam_root="/dev/disk/by-partlabel/$root_partlabel"
                         fi
 
+                        if [ "`echo ${bootparam_root} | cut -c1-10`" = "PARTLABEL=" ]; then
+                                root_partlabel=`echo $bootparam_root | cut -c11-`
+                                bootparam_root="/dev/disk/by-partlabel/$root_partlabel"
+                        fi
+
                         if [ "`echo ${bootparam_root} | cut -c1-6`" = "LABEL=" ]; then
                                 root_label=`echo $bootparam_root | cut -c7-`
                                 bootparam_root="/dev/disk/by-label/$root_label"