Ignore errors due to sharesmb on pool import

For users who have sharesmb property set to on,
when trying to import the pool on TrueNAS, they
run into error and pool import fails because the
samba usershares path on Linux, i.e.
/var/lib/samba/usershares does not exist on
TrueNAS SCALE.

To resolve this issue, do not return the error
while enabling the SMB shares, instead print the
error message and continue. Since we rely on
middleware to manage the SMB shares, returing
the error results in failure of overall command,
even though imported pool shows up in zpool list.

Signed-off-by: Umer Saleem <[email protected]>

lib/libzfs/libzfs_mount.c

@@ -738,10 +738,27 @@ zfs_share(zfs_handle_t *zhp, const enum sa_protocol *proto)
 		err = sa_enable_share(zfs_get_name(zhp), mountpoint, shareopts,
 		    *curr_proto);
 		if (err != SA_OK) {
-			return (zfs_error_fmt(zhp->zfs_hdl,
-			    proto_table[*curr_proto].p_share_err,
-			    dgettext(TEXT_DOMAIN, "cannot share '%s: %s'"),
-			    zfs_get_name(zhp), sa_errorstr(err)));
+			/*
+			 * For TrueNAS, do not return the error encountered
+			 * while enabling the SMB share, instead print the
+			 * error message and continue. We rely on middleware
+			 * to manage the SMB shares. Returning this error
+			 * from here results in failure of overall command,
+			 * even though pool shows up in zpool list.
+			 */
+			if (proto_table[*curr_proto].p_prop ==
+					ZFS_PROP_SHARESMB)
+				zfs_error_fmt(zhp->zfs_hdl,
+					proto_table[*curr_proto].p_share_err,
+					dgettext(TEXT_DOMAIN,
+					"cannot share '%s: %s'"),
+					zfs_get_name(zhp), sa_errorstr(err));
+			else
+				return (zfs_error_fmt(zhp->zfs_hdl,
+					proto_table[*curr_proto].p_share_err,
+					dgettext(TEXT_DOMAIN,
+					"cannot share '%s: %s'"),
+					zfs_get_name(zhp), sa_errorstr(err)));
 		}
 
 	}