Fix an error in bsdinstall when ZFS installation uses a bootpool

A separate bootpool is used when the selected partition type is MBR
or when the disk is GELI encrypted and a UEFI loader is selected.

BIOS avoids the bootpool by using bootcode and loader that support GELI.

bsdinstall did not remount the bootpool after creating the main pool,
which caused an error when mkdir tried to create /boot/zfs

PR:		210717
Approved by:	re (gjb)
Sponsored by:	ScaleEngine Inc.

1 files changed, 11 insertions, 8 deletions

diff --git a/usr.sbin/bsdinstall/scripts/zfsboot b/usr.sbin/bsdinstall/scripts/zfsboot
index db28284a744f..d2de12b73715 100755
--- a/usr.sbin/bsdinstall/scripts/zfsboot
+++ b/usr.sbin/bsdinstall/scripts/zfsboot
@@ -218,6 +218,7 @@ SWAP_GMIRROR_LABEL='gmirror label swap %s'
 SYSCTL_ZFS_MIN_ASHIFT_12='sysctl vfs.zfs.min_auto_ashift=12'
 UMOUNT='umount "%s"'
 ZFS_CREATE_WITH_OPTIONS='zfs create %s "%s"'
+ZFS_MOUNT='zfs mount "%s"'
 ZFS_SET='zfs set "%s" "%s"'
 ZFS_UNMOUNT='zfs unmount "%s"'
 ZPOOL_CREATE_WITH_OPTIONS='zpool create %s "%s" %s %s'
@@ -1350,13 +1351,6 @@ zfs_create_boot()
 		             $BSDINSTALL_CHROOT$dir || return $FAILURE
 	done
 
-	# Create symlink(s)
-	if [ "$ZFSBOOT_BOOT_POOL" ]; then
-		f_dprintf "$funcname: Creating /boot symlink for boot pool..."
-		f_eval_catch $funcname ln "$LN_SF" "$bootpool_name/boot" \
-		             $BSDINSTALL_CHROOT/boot || return $FAILURE
-	fi
-
 	# Set bootfs property
 	local zroot_bootfs="$ZFSBOOT_BEROOT_NAME/$ZFSBOOT_BOOTFS_NAME"
 	f_dprintf "$funcname: Setting bootfs property..."
@@ -1396,7 +1390,16 @@ zfs_create_boot()
 		fi
 	fi
 
-	# While this is apparently not needed, it seems to help MBR
+	# Remount bootpool and create symlink(s)
+	if [ "$ZFSBOOT_BOOT_POOL" ]; then
+		f_eval_catch $funcname zfs "$ZFS_MOUNT" "$bootpool_name" ||
+			return $FAILURE
+		f_dprintf "$funcname: Creating /boot symlink for boot pool..."
+		f_eval_catch $funcname ln "$LN_SF" "$bootpool_name/boot" \
+		             $BSDINSTALL_CHROOT/boot || return $FAILURE
+	fi
+
+	# zpool.cache is required to mount more than one pool at boot time
 	f_dprintf "$funcname: Configuring zpool.cache for zroot..."
 	f_eval_catch $funcname mkdir "$MKDIR_P" $BSDINSTALL_CHROOT/boot/zfs ||
 	             return $FAILURE