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gluon-core: gluon.util: make exec() replace all stdio files with /dev/null

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This commit is contained in:
Matthias Schiffer 2017-02-10 22:09:59 +01:00
parent ea12cb770d
commit e39cbcbda1
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GPG Key ID: 16EF3F64CB201D9C
1 changed files with 21 additions and 8 deletions
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29
package/gluon-core/luasrc/usr/lib/lua/gluon/util.lua
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@ -13,13 +13,14 @@ local function do_filter_prefix(input, output, prefix)
return f
end
local function escape_args(ret, arg0, ...)
if not arg0 then
return ret
local function close_stdio(stream, mode)
local null = nixio.open('/dev/null', mode)
if null then
nixio.dup(null, nixio[stream])
if null:fileno() > 2 then
null:close()
end
end
return escape_args(ret .. "'" .. string.gsub(arg0, "'", "'\\''") .. "' ", ...)
end
@ -76,9 +77,21 @@ function remove_from_set(t, itm)
return changed
end
function exec(...)
return os.execute(escape_args('', 'exec', ...))
local pid, errno, error = nixio.fork()
if pid == 0 then
close_stdio('stdin', 'r')
close_stdio('stdout', 'w')
close_stdio('stderr', 'w')
nixio.execp(...)
os.exit(127)
elseif pid > 0 then
local wpid, status, code = nixio.waitpid(pid)
return wpid and status == 'exited' and code
else
return nil, errno, error
end
end
-- Removes all lines starting with a prefix from a file, optionally adding a new one