On 20/03/2014 04:02, Harry Putnam wrote:
I wanted to setup some homeboy snapshot destroys on the basis of mving
to all .zfs/snapshot directories and using ls -t, sed, zfs snapshot
destroy to
get rid of snaps beyond the most recent 8 in the directory
So is something like 'zfs -H -t snapshot -o name' the only way to
ferret out actual addresses of the snaps?
I'd sooner use basic oldschool unix tools if possible
One more approach to use is to parse the output of /bin/df (the GNU df
might produce unwanted multiline output and break scripted parsing) to
find the mountpoints. This lets you discover devices which start without
a slash and don't contain a colon (nfs/cifs mounts) do get local POSIX
ZFS datasets. Alternately you can check all mountpoints for existence
of a "$dir/.zfs/snapshot" to get all mounts backed by a ZFS dataset
(including those mounted from the network) and "cd $dir/.zfs/snapshot \
&& ls -1" to list all snapshot names, or mkdir to create a snapshot
(including over network, as long as your access privileges allow that).
One caveat is that for autofs+nfs you'd first have to access (ls) a
mountpoint to get it mounted and then you'd see if it is a ZFS-backed
submount (or indeed *any* mountpoint and not just a directory at all).
And unlike "zfs list", you don't get to "find" and manage snapshots of
non-mounted datasets at all.
HTH,
//Jim Klimov
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