btrfs not found.

My machine runs on OpenSuse TumbleTweet.
I installed btrfsprogs.
If I dryrun btrbk in normal user mode, it says that : btrfs not found, can't fetch subvolume infomation and stop.
If I dryrun it in sudo mode, it doesn't nothing, even not print verbose info.

Start by reproducing the normal-user and sudo dry-run commands described in the issue on OpenSUSE Tumbleweed, comparing their output and environment. Check how btrbk locates and invokes the installed btrfsprogs tools; done means the dry run fetches subvolume information and prints its expected verbose output without requiring an unexplained privilege difference.

Written by the indexing model from the issue text.