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f489458ad7
Channel programs that many users find useful should be included with zfs in the /contrib directory. This is the first of these contributions. A channel program to recursively take snapshots of datasets with the property com.sun:auto-snapshot=true. Reviewed-by: Kash Pande <kash@tripleback.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Clint Armstrong <clint@clintarmstrong.net> Closes #8443 Closes #9050
76 lines
1.5 KiB
Lua
76 lines
1.5 KiB
Lua
-- Recursively snapshot every dataset with a given property
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--
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-- Usage: zfs program <pool> autosnap.lua -- [-n] [-p <property>] <snapshot>
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results = {}
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args = ...
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argv = args["argv"]
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usage = [[
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usage: zfs program <pool> autosnap.lua -- [-n] [-p <property>] <snapshot>
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-n: performs checks only, does not take snapshots
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-p <property>: property to check. [default: com.sun:auto-snapshot]
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<snapshot>: root snapshot to create [example: tank/data@backup]
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]]
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property = "com.sun:auto-snapshot"
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noop = false
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root_snap = nil
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for i, arg in ipairs(argv) do
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if arg == "-n" then
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noop = true
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elseif arg == "-p" then
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elseif argv[i-1] == "-p" then
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property = arg
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else
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root_snap = arg
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end
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end
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if root_snap == nil or property == nil then
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error(usage)
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end
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root_ds_name = ""
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snap_name = ""
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for i = 1, #root_snap do
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if root_snap:sub(i, i) == "@" then
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root_ds_name = root_snap:sub(1, i-1)
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snap_name = root_snap:sub(i+1, root_snap:len())
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end
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end
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function auto_snap(root)
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auto, source = zfs.get_prop(root, property)
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if auto == "true" then
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ds_snap_name = root .. "@" .. snap_name
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err = 0
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if noop then
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err = zfs.check.snapshot(ds_snap_name)
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else
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err = zfs.sync.snapshot(ds_snap_name)
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end
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results[ds_snap_name] = err
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end
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for child in zfs.list.children(root) do
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auto_snap(child)
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end
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end
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auto_snap(root_ds_name)
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err_txt = ""
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for ds, err in pairs(results) do
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if err ~= 0 then
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err_txt = err_txt .. "failed to create " .. ds .. ": " .. err .. "\n"
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end
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end
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if err_txt ~= "" then
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error(err_txt)
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end
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return results
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