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-- Authors: Tibor Csögör <tibi@tiborius.net>
-- License: Public domain
-- Last Changed: 2006-11-14
--
-- $Id: statusd_df.lua 60 2006-11-14 11:19:29Z tibi $
-- statusd_df.lua -- disk space monitor for Ion3's statusbar
-- version : 0.1
-- date : 2006-11-14
-- author : Tibor Csögör <tibi@tiborius.net>
-- Shows the disk space usage of given file systems.
-- The standard UNIX tool df(1) is used to obtain the needed data. This script
-- assumes that df understands the -k flag and produces an output like the
-- following (the header line is ignored):
-- Filesystem 1K-blocks Used Available Use% Mounted on
-- /dev/hda6 2403420 33264 2248064 2% /tmp
-- Configuration:
-- The `template' string controls how the output will be formated. It may
-- contain the following keywords:
-- PLACEHOLDER DESCRIPTION EXAMPLE
-- ----------- ----------- -------
-- mpoint mount point /home
-- fs file system /dev/sda2
-- size size of fs 40G
-- used used space 12.6G
-- usedp used space in % 31.5%
-- avail available space 27.4G
-- availp available space in % 68.5%
-- The `fslist' holds the file systems (mount points) to be monitored.
-- `separator' is placed between the entries in the output. Statistics are
-- updated every `update_interval' milliseconds.
-- This software is in the public domain.
--------------------------------------------------------------------------------
local defaults = {
template = "[%mpoint: %avail (%availp) free]",
fslist = { "/" },
separator = " ",
update_interval = 1000, -- 1 second
}
local settings = table.join(statusd.get_config("df"), defaults)
local df_timer = statusd.create_timer()
function math.round(num, idp)
local mult = 10^(idp or 0)
return math.floor(num * mult + 0.5) / mult
end
local function guess_mem_unit(amount)
amount = tonumber(amount)
if (amount < 1024) then
return amount .. "k"
elseif (amount >= 1024) and (amount < 1048576) then
return math.round((amount / 1024), 0) .. "M"
elseif (amount > 1048576) then
return math.round((amount / 1048576), 1) .. "G"
end
end
local function get_df()
local df_table = {}
local f = io.popen('df -k', 'r')
if (f == nil) then return nil end
f:read("*line") -- skip header line
local s = f:read("*a")
f:close()
local i = 0
while (i < string.len(s)) do
local j, fsname, fssize, fsused, fsavail, fsusedp, mpoint
i, j, fsname, fssize, fsused, fsavail, fsusedp, mpoint
= string.find(s, "(/%S+)%s+(%d+)%s+(%d+)%s+(%d+)%s+(%d+)%%?%s(%S+)\n",
i)
if (i == nil) then break end
df_table[mpoint] = { mpoint=mpoint,
fs=fsname,
size=guess_mem_unit(tonumber(fssize)),
used=guess_mem_unit(tonumber(fsused)),
avail=guess_mem_unit(tonumber(fsavail)),
usedp=tonumber(fsusedp),
availp=((100 - tonumber(fsusedp)) .. "%") }
i = j+1
end
return df_table
end
local function update_df()
local t = get_df()
if (t == nil) then return nil end
local df_str = ""
for i=1, #settings.fslist do
local s = string.gsub(settings.template, "%%(%w+)",
function (arg)
if (t[settings.fslist[i]] ~= nil) then
return t[settings.fslist[i]][arg]
end
return nil
end)
df_str = df_str .. settings.separator .. s
end
df_str = string.sub(df_str, #settings.separator + 1)
statusd.inform("df", df_str)
df_timer:set(settings.update_interval, update_df)
end
update_df()
-- EOF
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