[cli] append lualib paths to load openresty libraries

* when rover.setup is activated it strips out all paths other than
lua_modules
* openresty ships shared code in $prefix/lualib/ directory

CHANGELOG.md

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Running with development config in Docker [PR #555](https://github.com/3scale/apicast/pull/555)
 - Fix setting twice the headers in a pre-flight request in the CORS policy [PR #570](https://github.com/3scale/apicast/pull/570)
 - Fix case where debug headers are returned without enabling the option [PR #577](https://github.com/3scale/apicast/pull/577)
+- Fix errors loading openresty libraries when rover is active [PR #598](https://github.com/3scale/apicast/pull/598)
 
 ## Changed
 

gateway/bin/apicast

@@ -80,9 +80,9 @@ my $bin = "$apicast_bin/cli";
 if (! -f $bin) {
     my ($lua, $lua_file) = tempfile();
 
-    print $lua <<_LUA_;
-require('apicast.cli')(arg)
-_LUA_
+    print { $lua } <DATA>;
+    close DATA;
+    close $lua;
 
     $bin = $lua_file;
 }
@@ -109,3 +109,61 @@ for my $inc ($apicast_src, 'src') {
 my @args = ('resty', @resty_args, $bin, @ARGV);
 
 exec '/usr/bin/env', @args;
+
+__DATA__
+#!/usr/bin/env resty
+local ok, setup = pcall(require, 'rover.setup')
+local re = require('ngx.re')
+-- detect the full path to resty binary this has been started with
+local function resty(code)
+    local cmd
+    do
+        local i = 0
+
+        while not cmd do
+            if not arg[i-1] then cmd = arg[i] end
+            i = i - 1
+        end
+    end
+
+    if not cmd then return nil, 'could not find resty' end
+
+    local handle = io.popen(([[/usr/bin/env -i %q -e %q]]):format(cmd, code))
+    local result = handle:read("*l")
+
+    handle:close()
+
+    return result
+end
+-- get the default package.path and strip out paths for shared code
+local function default_package_path()
+    local sep = ';'
+    local filtered = {}
+    local LUA_DEFAULT_PATH = resty('print(package.path)')
+    local contains = function(str, pattern) return str:find(pattern, 1, true) end
+    local paths = re.split(LUA_DEFAULT_PATH or '', sep, 'oj')
+
+    for i=1,#paths do
+        local path = paths[i]
+
+        if not contains(path, '/site/') and
+           not contains(path, '/share/') and
+           path:find('^/') then
+            table.insert(filtered, path)
+        end
+    end
+
+    return table.concat(filtered, sep)
+end
+
+if ok then
+    setup()
+    -- use not only rover paths but also code shipped with openresty
+    package.path = package.path ..';' .. default_package_path()
+    -- load apicast and dependencies
+    require('apicast.executor')
+else
+    package.path = './src/?.lua;' .. package.path
+end
+
+require('apicast.cli')(arg)