The branch main has been updated by imp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=7ef92163ab81b1b14f2a111d17baf2b352338577

commit 7ef92163ab81b1b14f2a111d17baf2b352338577
Author:     John Ko <[email protected]>
AuthorDate: 2021-06-02 17:12:14 +0000
Commit:     Warner Losh <[email protected]>
CommitDate: 2021-06-02 17:12:14 +0000

    Allows user to specify an optional ZFSBOOT_POOL_SIZE for their zroot
    
    The default is to create a zroot that consumes the whole disk because if
    used with geli(8) this makes sense.
    
    Without geli(8), I like to keep my data pool separate from my system
    pool.
    
    This is different than ZFSBOOT_BOOT_POOL_SIZE which is named bootpool.
    
    Reviewed by:            allenjude
    Pull Request:           https://github.com/freebsd/freebsd-src/pull/53
    Differential Revision:  https://reviews.freebsd.org/D30588
---
 usr.sbin/bsdinstall/scripts/zfsboot | 46 ++++++++++++++++++++++++++++++-------
 1 file changed, 38 insertions(+), 8 deletions(-)

diff --git a/usr.sbin/bsdinstall/scripts/zfsboot 
b/usr.sbin/bsdinstall/scripts/zfsboot
index 3b673addb10a..45c8b001c393 100755
--- a/usr.sbin/bsdinstall/scripts/zfsboot
+++ b/usr.sbin/bsdinstall/scripts/zfsboot
@@ -44,6 +44,11 @@ f_include $BSDCFG_SHARE/variable.subr
 #
 : ${ZFSBOOT_POOL_NAME:=zroot}
 
+#
+# Default pool size is optional
+#
+: ${ZFSBOOT_POOL_SIZE=}
+
 #
 # Default options to use when creating zroot pool
 #
@@ -262,6 +267,7 @@ msg_install_help="Create ZFS boot pool with displayed 
options"
 msg_invalid_boot_pool_size="Invalid boot pool size \`%s'"
 msg_invalid_disk_argument="Invalid disk argument \`%s'"
 msg_invalid_index_argument="Invalid index argument \`%s'"
+msg_invalid_pool_size="Invalid pool size \`%s'"
 msg_invalid_swap_size="Invalid swap size \`%s'"
 msg_invalid_virtual_device_type="Invalid Virtual Device type \`%s'"
 msg_last_chance_are_you_sure="Last Chance! Are you sure you want to 
destroy\nthe current contents of the following disks:\n\n   %s"
@@ -943,9 +949,15 @@ zfs_create_diskpart()
                #
                # 4. Add freebsd-zfs partition labeled `zfs#' for zroot
                #
-               f_eval_catch $funcname gpart "$GPART_ADD_ALIGN_LABEL" \
-                            "$align_big" zfs$index freebsd-zfs $disk ||
-                            return $FAILURE
+               if [ "$ZFSBOOT_POOL_SIZE" ]; then
+                       f_eval_catch $funcname gpart 
"$GPART_ADD_ALIGN_LABEL_WITH_SIZE" \
+                                       "$align_big" zfs$index freebsd-zfs 
$ZFSBOOT_POOL_SIZE $disk ||
+                                       return $FAILURE
+               else
+                       f_eval_catch $funcname gpart "$GPART_ADD_ALIGN_LABEL" \
+                                       "$align_big" zfs$index freebsd-zfs 
$disk ||
+                                       return $FAILURE
+               fi
                f_eval_catch -d $funcname zpool "$ZPOOL_LABELCLEAR_F" \
                                /dev/$disk$targetpart
                ;;
@@ -1020,9 +1032,13 @@ zfs_create_diskpart()
                #
                # 5. Add freebsd-zfs partition for zroot
                #
-               f_eval_catch $funcname gpart "$GPART_ADD_ALIGN_INDEX" \
-                            "$align_small" $mbrindex freebsd-zfs ${disk}s1 ||
-                            return $FAILURE
+               if [ "$ZFSBOOT_POOL_SIZE" ]; then
+                       f_eval_catch $funcname gpart 
"$GPART_ADD_ALIGN_INDEX_WITH_SIZE" \
+                                       "$align_small" $mbrindex freebsd-zfs 
$ZFSBOOT_POOL_SIZE ${disk}s1 || return $FAILURE
+               else
+                       f_eval_catch $funcname gpart "$GPART_ADD_ALIGN_INDEX" \
+                                       "$align_small" $mbrindex freebsd-zfs 
${disk}s1 || return $FAILURE
+               fi
                f_eval_catch -d $funcname zpool "$ZPOOL_LABELCLEAR_F" \
                                /dev/$disk$targetpart # Pedantic
                f_eval_catch $funcname dd "$DD_WITH_OPTIONS" \
@@ -1114,7 +1130,7 @@ zfs_create_boot()
        # Expand SI units in desired sizes
        #
        f_dprintf "$funcname: Expanding supplied size values..."
-       local swapsize bootsize
+       local swapsize bootsize poolsize
        if ! f_expand_number "$ZFSBOOT_SWAP_SIZE" swapsize; then
                f_dprintf "$funcname: Invalid swap size \`%s'" \
                          "$ZFSBOOT_SWAP_SIZE"
@@ -1128,6 +1144,16 @@ zfs_create_boot()
                           "$ZFSBOOT_BOOT_POOL_SIZE"
                return $FAILURE
        fi
+       if [ "$ZFSBOOT_POOL_SIZE" ]; then
+               if ! f_expand_number "$ZFSBOOT_POOL_SIZE" poolsize; then
+                       f_dprintf "$funcname: Invalid pool size \`%s'" \
+                                 "$ZFSBOOT_POOL_SIZE"
+                       f_show_err "$msg_invalid_pool_size" \
+                                  "$ZFSBOOT_POOL_SIZE"
+               fi
+               f_dprintf "$funcname: ZFSBOOT_POOL_SIZE=[%s] poolsize=[%s]" \
+                         "$ZFSBOOT_POOL_SIZE" "$poolsize"
+       fi
        f_dprintf "$funcname: ZFSBOOT_SWAP_SIZE=[%s] swapsize=[%s]" \
                  "$ZFSBOOT_SWAP_SIZE" "$swapsize"
        f_dprintf "$funcname: ZFSBOOT_BOOT_POOL_SIZE=[%s] bootsize=[%s]" \
@@ -1627,7 +1653,11 @@ while :; do
                   f_expand_number "$ZFSBOOT_BOOT_POOL_SIZE" bootsize &&
                   f_expand_number "1g" zpoolmin
                then
-                       minsize=$(( $swapsize + $zpoolmin )) teeny_disks=
+                       minsize=$swapsize teeny_disks=
+                       if [ "$ZFSBOOT_POOL_SIZE" ]; then
+                               f_expand_number "$ZFSBOOT_POOL_SIZE" poolsize
+                               minsize=$(( $minsize + $poolsize ))
+                       fi
                        [ "$ZFSBOOT_BOOT_POOL" ] &&
                                minsize=$(( $minsize + $bootsize ))
                        for disk in $ZFSBOOT_DISKS; do
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