forgot to commit openos

data/openos/lib/tools/programLocations.lua

@@ -0,0 +1,31 @@
+local computer = require("computer")
+local fs = require("filesystem")
+local shell = require("shell")
+local lib = {}
+
+function lib.locate(path)
+  for _,lookup in ipairs(computer.getProgramLocations()) do
+    if lookup[1] == path then
+      return lookup[2]
+    end
+  end
+end
+
+function lib.reportNotFound(path, reason)
+  checkArg(1, path, "string")
+  if fs.isDirectory(shell.resolve(path)) then
+    io.stderr:write(path .. ": is a directory\n")
+    return 126
+  end
+  local loot = lib.locate(path)
+  if loot then
+    io.stderr:write("The program '" .. path .. "' is currently not installed.  To install it:\n" ..
+      "1. Craft the '" .. loot .. "' floppy disk and insert it into this computer.\n" ..
+      "2. Run `install " .. loot  .. "`")
+  elseif type(reason) == "string" then
+    io.stderr:write(path .. ": " .. reason .. "\n")
+  end
+  return 127
+end
+
+return lib