luci-base: utils: Make checklib return a boolean

[project/luci.git] / modules / luci-base / luasrc / util.lua

diff --git a/modules/luci-base/luasrc/util.lua b/modules/luci-base/luasrc/util.lua
index 8b28b17..896e36b 100644 (file)
--- a/modules/luci-base/luasrc/util.lua
+++ b/modules/luci-base/luasrc/util.lua
@@ -9,6 +9,7 @@ local ldebug = require "luci.debug"
 local string = require "string"
 local coroutine = require "coroutine"
 local tparser = require "luci.template.parser"
+local json = require "luci.jsonc"
 
 local _ubus = require "ubus"
 local _ubus_connection = nil
@@ -150,6 +151,28 @@ function striptags(value)
        return value and tparser.striptags(tostring(value))
 end
 
+-- for bash, ash and similar shells single-quoted strings are taken
+-- literally except for single quotes (which terminate the string)
+-- (and the exception noted below for dash (-) at the start of a
+-- command line parameter).
+function shellsqescape(value)
+   local res
+   res, _ = string.gsub(value, "'", "'\\''")
+   return res
+end
+
+-- bash, ash and other similar shells interpret a dash (-) at the start
+-- of a command-line parameters as an option indicator regardless of
+-- whether it is inside a single-quoted string.  It must be backlash
+-- escaped to resolve this.  This requires in some funky special-case
+-- handling.  It may actually be a property of the getopt function
+-- rather than the shell proper.
+function shellstartsqescape(value)
+   res, _ = string.gsub(value, "^\-", "\\-")
+   res, _ = string.gsub(res, "^-", "\-")
+   return shellsqescape(value)
+end
+
 -- containing the resulting substrings. The optional max parameter specifies
 -- the number of bytes to process, regardless of the actual length of the given
 -- string. The optional last parameter, regex, specifies whether the separator
@@ -600,55 +623,11 @@ function ubus(object, method, data)
 end
 
 function serialize_json(x, cb)
-       local rv, push = nil, cb
-       if not push then
-               rv = { }
-               push = function(tok) rv[#rv+1] = tok end
-       end
-
-       if x == nil then
-               push("null")
-       elseif type(x) == "table" then
-               -- test if table is array like
-               local k, v
-               local n1, n2 = 0, 0
-               for k in pairs(x) do n1 = n1 + 1 end
-               for k in ipairs(x) do n2 = n2 + 1 end
-
-               if n1 == n2 and n1 > 0 then
-                       push("[")
-                       for k = 1, n2 do
-                               if k > 1 then
-                                       push(",")
-                               end
-                               serialize_json(x[k], push)
-                       end
-                       push("]")
-               else
-                       push("{")
-                       for k, v in pairs(x) do
-                               push("%q:" % tostring(k))
-                               serialize_json(v, push)
-                               if next(x, k) then
-                                       push(",")
-                               end
-                       end
-                       push("}")
-               end
-       elseif type(x) == "number" or type(x) == "boolean" then
-               if (x ~= x) then
-                       -- NaN is the only value that doesn't equal to itself.
-                       push("Number.NaN")
-               else
-                       push(tostring(x))
-               end
+       local js = json.stringify(x)
+       if type(cb) == "function" then
+               cb(js)
        else
-               push('"%s"' % tostring(x):gsub('["%z\1-\31]',
-                       function(c) return '\\u%04x' % c:byte(1) end))
-       end
-
-       if not cb then
-               return table.concat(rv, "")
+               return js
        end
 end
 
@@ -657,6 +636,23 @@ function libpath()
        return require "nixio.fs".dirname(ldebug.__file__)
 end
 
+function checklib(fullpathexe, wantedlib)
+       local fs = require "nixio.fs"
+       local haveldd = fs.access('/usr/bin/ldd')
+       if not haveldd then
+               return false
+       end
+       local libs = exec("/usr/bin/ldd " .. fullpathexe)
+       if not libs then
+               return false
+       end
+       for k, v in ipairs(split(libs)) do
+               if v:find(wantedlib) then
+                       return true
+               end
+       end
+       return false
+end
 
 --
 -- Coroutine safe xpcall and pcall versions modified for Luci