[Bug 248804] sysutils/zfstools: Doesn't clean up old snapshots that were in use

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248804

            Bug ID: 248804
           Summary: sysutils/zfstools: Doesn't clean up old snapshots that
                    were in use
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: bdrewery at FreeBSD.org
          Reporter: danmcgrath.ca at gmail.com
             Flags: maintainer-feedback?(bdrewery at FreeBSD.org)
          Assignee: bdrewery at FreeBSD.org

Hi,

This is a bit of an old bug that I've been dealing with for quite some time,
and I am not 100% sure on the cause, but have some theories. I am using
zfstools 0.3.6_1.

This bug is that old snapshots that were locked from delete (in use) during
backups, I presume, prevent the script from cleanup up the snapshot. The
problem is that the system never goes back to all of the past ones that it
missed to clean them up. The result is that you are left with a bunch of
snapshots laying around from years ago, in some cases, for something like an
hourly snapshot.

eg: data/ezjail/my.jail.name.org at zfs-auto-snap_hourly-2019-08-02-08h00

IMHO, this tool should be considered to "own" the entire namespace of
"zfs-auto-snap_$timestamp" etc, and thus no harm in going over the entire
history to at least clean up older stuff that sticks around an extra moment.

Any ideas if this is a bug or something that can be considered implementing? I
know it wouldn't be the first time that our systems ran low on space due to
this issue.

Thanks!

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