bectl: Implement -D ("space if origin datasets were deleted")

This also accomplishes the following:

- Proxy through zfs_nicenum as be_nicenum, because it looks better than
  humanize_number and would presumably be useful to other libbe consumers.

- Rename be_get_snapshot_props to be_get_dataset_props, make it more useful

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/libbe/be.c b/lib/libbe/be.c
index 48bb36c2beea..4e889abee2e4 100644
--- a/lib/libbe/be.c
+++ b/lib/libbe/be.c
@@ -171,6 +171,15 @@ libbe_close(libbe_handle_t *lbh)
 	free(lbh);
 }
 
+/*
+ * Proxy through to libzfs for the moment.
+ */
+void
+be_nicenum(uint64_t num, char *buf, size_t buflen)
+{
+
+	zfs_nicenum(num, buf, buflen);
+}
 
 /*
  * Destroy the boot environment or snapshot specified by the name