From a5b464263bc1f9fd833272a9e691cd479bf47d5d Mon Sep 17 00:00:00 2001
From: nachtgeist <nachtgeist@users.noreply.github.com>
Date: Fri, 8 Oct 2021 18:16:31 +0000
Subject: [PATCH] initramfs: use correct dataset for rootfs on rollback=1

When booting with root=zfs:rpool/myrootfs@foosnapshot rollback=1,
myrootfs and its descendants get rolled back to foosnapshot, however
ZFS_BOOTFS still contains myrootfs@foosnapshot instead of the
actually desired value of myrootfs.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Signed-off-by: Daniel Reichelt <hacking@nachtgeist.net>
Closes #12585
Closes #12586
---
 contrib/initramfs/scripts/zfs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contrib/initramfs/scripts/zfs b/contrib/initramfs/scripts/zfs
index 306e6e157e..35502291e6 100644
--- a/contrib/initramfs/scripts/zfs
+++ b/contrib/initramfs/scripts/zfs
@@ -630,6 +630,7 @@ setup_snapshot_booting()
 		then
 			# Rollback snapshot
 			rollback_snap "$s" || retval=$((retval + 1))
+			ZFS_BOOTFS="${rootfs}"
 		else
 			# Setup a destination filesystem name.
 			# Ex: Called with 'rpool/ROOT/debian@snap2'