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#!/usr/bin/env luajit
-- Most of this _ stuff was copied from apt-panopticon.
local _ = {}
_.version = '0.0 crap'
_.D = function(s) print('DEBUG ' .. s) end
_.I = function(s) print('INFO ' .. s) end
_.T = function(s) print('TIMEOUT ' .. s) end
_.W = function(s) print('WARNING ' .. s) end
_.E = function(s) print('ERROR ' .. s) end
_.C = function(s) print('CRITICAL ' .. s) end
local D = _.D
local I = _.I
local T = _.T
local W = _.W
local E = _.E
local C = _.C
_.readCmd = function(cmd)
local result = {}
local output = io.popen(cmd)
if nil ~= output then
for l in output:lines() do
table.insert(result, l)
end
end
-- While this does return the same things as os.execute(), it's just as useless.
output:close()
return result
end
_._ = function(c)
local exe = {status = 0, lines = {}, logging = false, showing = false, cmd = '', command = c}
local n = 0
exe.cmd = '{ '
if 'table' == type(c) then
for i, l in ipairs(c) do
n = n + 1
exe.cmd = exe.cmd .. l .. ' ; '
end
elseif 'string' == type(c) then
for l in string.gmatch(c, "\n*([^\n]+)\n*") do
if '' ~= l then
n = n + 1
exe.cmd = exe.cmd .. l .. ' ; '
end
end
end
exe.cmd = exe.cmd .. ' } '
if 1 == n then exe.cmd = c end
function exe:log()
self.logging = true
return self
end
function exe:show()
self.showing = true
return self
end
function exe:Nice(c)
if nil == c then
self.cmd = 'ionice -c3 nice -n 19 ' .. self.cmd
else
self.cmd = self.cmd .. ' ionice -c3 nice -n 19 ' .. c .. ' '
end
return self
end
function exe:timeout(c)
-- timeout returns a status of - command status if --preserve-status; "128+9" (actually 137) if --kill-after ends up being done; 124 if it had to TERM; command status if all went well.
-- --kill-after means "send KILL after TERM fails.
if nil == c then
self.cmd = 'timeout --kill-after=10.0 --foreground 42.0s ' .. self.cmd
else
self.cmd = 'timeout --kill-after=10.0 --foreground ' .. c .. ' ' .. self.cmd
end
return self
end
function exe:also(c) -- Should be called "then" but that's a reserved word.
if nil == c then c = '' else c = ' ' .. c end
self.cmd = self.cmd .. '; ' .. c .. ' '
return self
end
function exe:And(c)
if nil == c then c = '' else c = ' ' .. c end
self.cmd = self.cmd .. ' && ' .. c .. ' '
return self
end
function exe:Or(c)
if nil == c then c = '' end
self.cmd = self.cmd .. ' || ' .. c .. ' '
return self
end
function exe:noErr()
self.cmd = self.cmd .. ' 2>/dev/null '
return self
end
function exe:noOut()
self.cmd = self.cmd .. ' 1>/dev/null '
return self
end
function exe:wait(w)
self.cmd = self.cmd .. ' && touch ' .. w .. ' '
return self
end
function exe:Do()
--[[ "The condition expression of a control structure can return any
value. Both false and nil are considered false. All values different
from nil and false are considered true (in particular, the number 0
and the empty string are also true)."
says the docs, I beg to differ.]]
if true == self.logging then D(" executing - " .. self.cmd) end
--[[ Damn os.execute()
Lua 5.1 says it returns "a status code, which is system-dependent"
Lua 5.2 says it returns true/nil, "exit"/"signal", the status code.
I'm getting 7168 or 0. No idea what the fuck that is.
local ok, rslt, status = os.execute(s)
]]
self.lines = _.readCmd(self.cmd .. '; echo "$?"', 'r')
-- The last line will be the command's returned status, collect everything else in lines.
self.status = tonumber(self.lines[#self.lines])
self.lines[#self.lines] = nil
if true == self.showing then for i, l in ipairs(self.lines) do D(l) end end
if (137 == self.status) or (124 == self.status) then
T("timeout killed " .. self.status .. ' ' .. self.command)
elseif (nil == self.status) then
I("STATUS |" .. "NIL" .. '| ' .. self.command)
elseif (0 ~= self.status) then
I("STATUS |" .. self.status .. '| ' .. self.command)
end
return self
end
function exe:fork(host)
-- if nil ~= host then self.cmd = self.cmd .. '; r=$?; if [ $r -ge 124 ]; then echo "$r ' .. host .. ' failed forked command ' .. string.gsub(self.cmd, '"', "'") .. '"; fi' end
self.cmd = '{ ' .. self.cmd .. ' ; } & '
if true == self.logging then D(" forking - " .. self.cmd) end
os.execute(self.cmd)
return self
end
function exe:forkOnce()
if _.running(self.command) then
D('Already running ' .. self.command)
else
self:fork()
end
end
return exe
end
local __ = _._
_.runnable = function(c)
return ( 0 == __('which ' .. c):Do().status )
end
_.running = function(c)
return ( 1 ~= tonumber(__("pgrep -u $USER -cf " .. c):Do().lines[1]) )
end
_.exists = function(f)
local h, e = io.open(f, "r")
if nil == h then return false else h:close(); return true end
end
_.killEmAll = function(all)
for i,l in ipairs(all) do
local c = 0
while 0 ~= tonumber(__("pgrep -u $USER -xc " .. l):Do().lines[1]) do
local s = 'TERM'
if c > 1 then s = 'KILL'; __("sleep " .. c):Do() end
__("pkill -" .. s .. " -u $USER -x " .. l):log():Do()
c = c + 1
end
end
end
return _
|
