From 3f81fd7097ec931ebf6d862622e6d81834483dbb Mon Sep 17 00:00:00 2001
From: V3n3RiX <venerix@redcorelinux.org>
Date: Thu, 28 Jan 2021 00:37:32 +0000
Subject: sys-boot/os-prober : shamelessly take all the patches from openSUSE
 Factory to make it work

---
 ...ve-btrfs-handling-on-os-probing-for-grub2.patch | 94 ++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 sys-boot/os-prober/files/Improve-btrfs-handling-on-os-probing-for-grub2.patch

(limited to 'sys-boot/os-prober/files/Improve-btrfs-handling-on-os-probing-for-grub2.patch')

diff --git a/sys-boot/os-prober/files/Improve-btrfs-handling-on-os-probing-for-grub2.patch b/sys-boot/os-prober/files/Improve-btrfs-handling-on-os-probing-for-grub2.patch
new file mode 100644
index 00000000..ba6ceca7
--- /dev/null
+++ b/sys-boot/os-prober/files/Improve-btrfs-handling-on-os-probing-for-grub2.patch
@@ -0,0 +1,94 @@
+From: Egbert Eich <eich@suse.de>
+Date: Fri May 29 08:55:21 2015 +0200
+Subject: Improve btrfs handling on os-probing for grub2
+Patch-mainline: never
+
+References: bsc#892364
+Signed-off-by: Egbert Eich <eich@suse.com>
+
+Currently probing of a grub2 config file is broken if
+the root/boot fs is btrfs. This is due to a patch picked
+from Fedora which attempts to determine the location of
+the kernel and probe for it.
+This code has meanwhile changed on Fedora, however the
+new version works no better than the old one.
+It is possible that this code works under very special
+circumstances of the Fedora system, however it is by no
+means valid.
+Our goal is to
+a. determine the location of the kernel in the mounted fs
+   regardless whether the grub2 config specifies an absolute
+   or relative path to the kernel file.
+b. Prepend the correct prefix if grub2_btrfs expects an
+   absolute path (either because the current grub2 fs isn't
+   btrfs or absolute path addressing is explicitely requested).
+c. Attempt to handle the location of the kernel file correctly
+   if this lives on a separate btrfs subvolume.
+   (Currently this only works if the path to this subvolume is
+   identical to the fs path).
+
+Signed-off-by: Egbert Eich <eich@suse.de>
+
+v2:
+a. Fix missing linux16/initrd16 parsing in entry result
+b. Fix kernelfile path if separate boot partition on btrfs 
+
+Signed-off-by: Michael Chang <mchang@suse.com>
+---
+ linux-boot-probes/mounted/common/40grub2 | 16 +++++++++++++---
+ 1 file changed, 13 insertions(+), 3 deletions(-)
+
+Index: os-prober-1.61/linux-boot-probes/mounted/common/40grub2
+===================================================================
+--- os-prober-1.61.orig/linux-boot-probes/mounted/common/40grub2
++++ os-prober-1.61/linux-boot-probes/mounted/common/40grub2
+@@ -14,9 +14,19 @@ bootsv="$6"
+ found_item=0
+ 
+ entry_result () {
+-	if [ "x$type" = "xbtrfs" -a "$rootsv" = "$bootsv" ]; then
+-		# trim off the leading subvol
+-		kernelfile=$(echo "$kernel" | cut -d '/' -f 2- | cut -d '/' -f 2-)
++	if [ "x$type" = "xbtrfs" ]; then
++		bsv=${bootsv:+/}${bootsv}
++		# if path is not relative to subvolume make it relative
++		kernel=${kernel#${bsv}}
++		kernelfile=$kernel
++		initrd=${initrd#${bsv}}
++		if [ "x$GRUB_FS" != "xbtrfs" -o "x${SUSE_BTRFS_SNAPSHOT_BOOTING}" != "xtrue" ]; then
++		    # absolute path needed: prepend subvolume if $kernel isn't empty
++		    kernel=${kernel:+${bsv}}${kernel}
++		    initrd=${initrd:+${bsv}}${initrd}
++		fi
++		# assumed: rootsv != bootsv if rootsv isn't ancestor of bootsv
++		[ "$partition" != "$bootpart" -o "$rootsv" != "$bootsv" ] && kernelfile="/boot${kernelfile}"
+ 	else
+ 		kernelfile=$kernel
+ 	fi
+@@ -81,7 +91,7 @@ parse_grub_menu () {
+ 					ignore_item=1
+ 				fi
+ 			;;
+-			linux|linuxefi)
++			linux|linuxefi|linux16)
+ 				# Hack alert: sed off any (hdn,n) but
+ 				# assume the kernel is on the same
+ 				# partition.
+@@ -90,14 +100,14 @@ parse_grub_menu () {
+ 				parameters="$@"
+ 				# Systems with a separate /boot will not have
+ 				# the path to the kernel in grub.cfg.
+-				if [ "$partition" != "$bootpart" ]; then
++				if [ "$partition" != "$bootpart" -a "$type" != "btrfs" ]; then
+ 					kernel="/boot$kernel"
+ 				fi
+ 			;;
+-			initrd|initrdefi)
++			initrd|initrdefi|initrd16)
+ 				initrd="$(echo "$2" | sed 's/(.*)//')"
+ 				# Initrd same.
+-				if [ "$partition" != "$bootpart" ]; then
++				if [ "$partition" != "$bootpart" -a "$type" != "btrfs" ]; then
+ 					initrd="/boot$initrd"
+ 				fi
+ 			;;
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