Test --working-dir in the testsuite

When testing `./Setup` only, when `withDirectory` is used, instead of
changing into that directory when invoking processes, we now use the
`--working-dir` flag and keep a fixed CWD.

This will therefore passively test that `--working-dir` is working

In addition, it makes it possible to test things easily such as
`--working-dir` with a relative path as an argument. `cabal-install`
will only invoke `--working-dir` with an absolute path and hence is
isolated from any double interpretation issues.

Testing against these double interpretation issues is very important as
it also prevents over-interpretation of relative paths into absolute
paths. Passing absolute paths to tools such as hsc2hs can lead to the
build directory leaking into an interface file which leads to
non-reproducible results.

cabal-testsuite/PackageTests/Backpack/Includes2/setup-external.cabal.out

@@ -8,7 +8,7 @@ for mylib-0.1.0.0...
 Preprocessing library for mylib-0.1.0.0...
 Running Haddock on library instantiated with Database = <Database>
 for mylib-0.1.0.0...
-Documentation created: ../setup-external.cabal.dist/work/mylib/dist/doc/html/mylib
+Documentation created: ./mylib/../setup-external.cabal.dist/work/mylib/dist/doc/html/mylib
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -22,7 +22,7 @@ Building library for mysql-0.1.0.0...
 # Setup haddock
 Preprocessing library for mysql-0.1.0.0...
 Running Haddock on library for mysql-0.1.0.0...
-Documentation created: ../setup-external.cabal.dist/work/mysql/dist/doc/html/mysql
+Documentation created: ./mysql/../setup-external.cabal.dist/work/mysql/dist/doc/html/mysql
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -35,7 +35,7 @@ Building library for postgresql-0.1.0.0...
 # Setup haddock
 Preprocessing library for postgresql-0.1.0.0...
 Running Haddock on library for postgresql-0.1.0.0...
-Documentation created: ../setup-external.cabal.dist/work/postgresql/dist/doc/html/postgresql
+Documentation created: ./postgresql/../setup-external.cabal.dist/work/postgresql/dist/doc/html/postgresql
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -51,7 +51,7 @@ Preprocessing library for mylib-0.1.0.0...
 Running Haddock on library instantiated with
   Database = mysql-0.1.0.0:Database.MySQL
 for mylib-0.1.0.0...
-Documentation created: ../setup-external.cabal.dist/work/mylib/dist/doc/html/mylib
+Documentation created: ./mylib/../setup-external.cabal.dist/work/mylib/dist/doc/html/mylib
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -69,7 +69,7 @@ Preprocessing library for mylib-0.1.0.0...
 Running Haddock on library instantiated with
   Database = postgresql-0.1.0.0:Database.PostgreSQL
 for mylib-0.1.0.0...
-Documentation created: ../setup-external.cabal.dist/work/mylib/dist/doc/html/mylib
+Documentation created: ./mylib/../setup-external.cabal.dist/work/mylib/dist/doc/html/mylib
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -84,7 +84,7 @@ Building library for src-0.1.0.0...
 # Setup haddock
 Preprocessing library for src-0.1.0.0...
 Running Haddock on library for src-0.1.0.0...
-Documentation created: ../setup-external.cabal.dist/work/src/dist/doc/html/src
+Documentation created: ./src/../setup-external.cabal.dist/work/src/dist/doc/html/src
 # Setup copy
 Installing library in <PATH>
 # Setup register

cabal-testsuite/PackageTests/Backpack/Includes2/setup-external.out

@@ -8,7 +8,7 @@ for mylib-0.1.0.0...
 Preprocessing library for mylib-0.1.0.0...
 Running Haddock on library instantiated with Database = <Database>
 for mylib-0.1.0.0...
-Documentation created: ../setup-external.dist/work/mylib/dist/doc/html/mylib
+Documentation created: ./mylib/../setup-external.dist/work/mylib/dist/doc/html/mylib
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -22,7 +22,7 @@ Building library for mysql-0.1.0.0...
 # Setup haddock
 Preprocessing library for mysql-0.1.0.0...
 Running Haddock on library for mysql-0.1.0.0...
-Documentation created: ../setup-external.dist/work/mysql/dist/doc/html/mysql
+Documentation created: ./mysql/../setup-external.dist/work/mysql/dist/doc/html/mysql
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -35,7 +35,7 @@ Building library for postgresql-0.1.0.0...
 # Setup haddock
 Preprocessing library for postgresql-0.1.0.0...
 Running Haddock on library for postgresql-0.1.0.0...
-Documentation created: ../setup-external.dist/work/postgresql/dist/doc/html/postgresql
+Documentation created: ./postgresql/../setup-external.dist/work/postgresql/dist/doc/html/postgresql
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -51,7 +51,7 @@ Preprocessing library for mylib-0.1.0.0...
 Running Haddock on library instantiated with
   Database = mysql-0.1.0.0:Database.MySQL
 for mylib-0.1.0.0...
-Documentation created: ../setup-external.dist/work/mylib/dist/doc/html/mylib
+Documentation created: ./mylib/../setup-external.dist/work/mylib/dist/doc/html/mylib
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -69,7 +69,7 @@ Preprocessing library for mylib-0.1.0.0...
 Running Haddock on library instantiated with
   Database = postgresql-0.1.0.0:Database.PostgreSQL
 for mylib-0.1.0.0...
-Documentation created: ../setup-external.dist/work/mylib/dist/doc/html/mylib
+Documentation created: ./mylib/../setup-external.dist/work/mylib/dist/doc/html/mylib
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -84,7 +84,7 @@ Building library for src-0.1.0.0...
 # Setup haddock
 Preprocessing library for src-0.1.0.0...
 Running Haddock on library for src-0.1.0.0...
-Documentation created: ../setup-external.dist/work/src/dist/doc/html/src
+Documentation created: ./src/../setup-external.dist/work/src/dist/doc/html/src
 # Setup copy
 Installing library in <PATH>
 # Setup register

cabal-testsuite/PackageTests/Backpack/Includes2/setup-per-component.out

@@ -8,7 +8,7 @@ for I-0.1.0.0...
 Preprocessing library 'mylib' for I-0.1.0.0...
 Running Haddock on library 'mylib' instantiated with Database = <Database>
 for I-0.1.0.0...
-Documentation created: ../setup-per-component.dist/work/Includes2/dist/doc/html/I/mylib
+Documentation created: ./Includes2/../setup-per-component.dist/work/Includes2/dist/doc/html/I/mylib
 # Setup copy
 Installing internal library mylib in <PATH>
 # Setup register
@@ -22,7 +22,7 @@ Building library 'mysql' for I-0.1.0.0...
 # Setup haddock
 Preprocessing library 'mysql' for I-0.1.0.0...
 Running Haddock on library 'mysql' for I-0.1.0.0...
-Documentation created: ../setup-per-component.dist/work/Includes2/dist/doc/html/I/mysql
+Documentation created: ./Includes2/../setup-per-component.dist/work/Includes2/dist/doc/html/I/mysql
 # Setup copy
 Installing internal library mysql in <PATH>
 # Setup register
@@ -35,7 +35,7 @@ Building library 'postgresql' for I-0.1.0.0...
 # Setup haddock
 Preprocessing library 'postgresql' for I-0.1.0.0...
 Running Haddock on library 'postgresql' for I-0.1.0.0...
-Documentation created: ../setup-per-component.dist/work/Includes2/dist/doc/html/I/postgresql
+Documentation created: ./Includes2/../setup-per-component.dist/work/Includes2/dist/doc/html/I/postgresql
 # Setup copy
 Installing internal library postgresql in <PATH>
 # Setup register
@@ -54,7 +54,7 @@ Preprocessing library 'mylib' for I-0.1.0.0...
 Running Haddock on library 'mylib' instantiated with
   Database = mysql-0.1.0.0:Database.MySQL
 for I-0.1.0.0...
-Documentation created: ../setup-per-component.dist/work/Includes2/dist/doc/html/I/mylib
+Documentation created: ./Includes2/../setup-per-component.dist/work/Includes2/dist/doc/html/I/mylib
 # Setup copy
 Installing internal library mylib in <PATH>
 # Setup register
@@ -75,7 +75,7 @@ Preprocessing library 'mylib' for I-0.1.0.0...
 Running Haddock on library 'mylib' instantiated with
   Database = postgresql-0.1.0.0:Database.PostgreSQL
 for I-0.1.0.0...
-Documentation created: ../setup-per-component.dist/work/Includes2/dist/doc/html/I/mylib
+Documentation created: ./Includes2/../setup-per-component.dist/work/Includes2/dist/doc/html/I/mylib
 # Setup copy
 Installing internal library mylib in <PATH>
 # Setup register
@@ -90,7 +90,7 @@ Building library for I-0.1.0.0...
 # Setup haddock
 Preprocessing library for I-0.1.0.0...
 Running Haddock on library for I-0.1.0.0...
-Documentation created: ../setup-per-component.dist/work/Includes2/dist/doc/html/I
+Documentation created: ./Includes2/../setup-per-component.dist/work/Includes2/dist/doc/html/I
 # Setup copy
 Installing library in <PATH>
 # Setup register

cabal-testsuite/PackageTests/Backpack/Includes3/setup-external-explicit.out

@@ -8,7 +8,7 @@ for sigs-0.1.0.0...
 Preprocessing library for sigs-0.1.0.0...
 Running Haddock on library instantiated with Data.Map = <Data.Map>
 for sigs-0.1.0.0...
-Documentation created: ../../setup-external-explicit.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
+Documentation created: ./repo/sigs-0.1.0.0/../../setup-external-explicit.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -24,7 +24,7 @@ for indef-0.1.0.0...
 Preprocessing library for indef-0.1.0.0...
 Running Haddock on library instantiated with Data.Map = <Data.Map>
 for indef-0.1.0.0...
-Documentation created: ../../setup-external-explicit.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
+Documentation created: ./repo/indef-0.1.0.0/../../setup-external-explicit.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
 # Setup copy
 Installing library in <PATH>
 # Setup register

cabal-testsuite/PackageTests/Backpack/Includes3/setup-external-ok.cabal.out

@@ -8,7 +8,7 @@ for sigs-0.1.0.0...
 Preprocessing library for sigs-0.1.0.0...
 Running Haddock on library instantiated with Data.Map = <Data.Map>
 for sigs-0.1.0.0...
-Documentation created: ../../setup-external-ok.cabal.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
+Documentation created: ./repo/sigs-0.1.0.0/../../setup-external-ok.cabal.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -24,7 +24,7 @@ for indef-0.1.0.0...
 Preprocessing library for indef-0.1.0.0...
 Running Haddock on library instantiated with Data.Map = <Data.Map>
 for indef-0.1.0.0...
-Documentation created: ../../setup-external-ok.cabal.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
+Documentation created: ./repo/indef-0.1.0.0/../../setup-external-ok.cabal.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -41,11 +41,12 @@ Preprocessing library for sigs-0.1.0.0...
 Running Haddock on library instantiated with
   Data.Map = containers-<VERSION>:Data.Map
 for sigs-0.1.0.0...
-Documentation created: ../../setup-external-ok.cabal.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
+Documentation created: ./repo/sigs-0.1.0.0/../../setup-external-ok.cabal.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
 # Setup copy
 Installing library in <PATH>
 # Setup register
-Registering library instantiated with Data.Map = containers-<VERSION>:Data.Map
+Registering library instantiated with
+  Data.Map = containers-<VERSION>:Data.Map
 for sigs-0.1.0.0...
 # Setup configure
 Configuring indef-0.1.0.0...
@@ -58,11 +59,12 @@ Preprocessing library for indef-0.1.0.0...
 Running Haddock on library instantiated with
   Data.Map = containers-<VERSION>:Data.Map
 for indef-0.1.0.0...
-Documentation created: ../../setup-external-ok.cabal.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
+Documentation created: ./repo/indef-0.1.0.0/../../setup-external-ok.cabal.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
 # Setup copy
 Installing library in <PATH>
 # Setup register
-Registering library instantiated with Data.Map = containers-<VERSION>:Data.Map
+Registering library instantiated with
+  Data.Map = containers-<VERSION>:Data.Map
 for indef-0.1.0.0...
 # Setup configure
 Configuring exe-0.1.0.0...

cabal-testsuite/PackageTests/Backpack/Includes3/setup-external-ok.out

@@ -8,7 +8,7 @@ for sigs-0.1.0.0...
 Preprocessing library for sigs-0.1.0.0...
 Running Haddock on library instantiated with Data.Map = <Data.Map>
 for sigs-0.1.0.0...
-Documentation created: ../../setup-external-ok.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
+Documentation created: ./repo/sigs-0.1.0.0/../../setup-external-ok.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -24,7 +24,7 @@ for indef-0.1.0.0...
 Preprocessing library for indef-0.1.0.0...
 Running Haddock on library instantiated with Data.Map = <Data.Map>
 for indef-0.1.0.0...
-Documentation created: ../../setup-external-ok.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
+Documentation created: ./repo/indef-0.1.0.0/../../setup-external-ok.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -41,11 +41,12 @@ Preprocessing library for sigs-0.1.0.0...
 Running Haddock on library instantiated with
   Data.Map = containers-<VERSION>:Data.Map
 for sigs-0.1.0.0...
-Documentation created: ../../setup-external-ok.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
+Documentation created: ./repo/sigs-0.1.0.0/../../setup-external-ok.dist/work/repo/sigs-0.1.0.0/dist/doc/html/sigs
 # Setup copy
 Installing library in <PATH>
 # Setup register
-Registering library instantiated with Data.Map = containers-<VERSION>:Data.Map
+Registering library instantiated with
+  Data.Map = containers-<VERSION>:Data.Map
 for sigs-0.1.0.0...
 # Setup configure
 Configuring indef-0.1.0.0...
@@ -58,11 +59,12 @@ Preprocessing library for indef-0.1.0.0...
 Running Haddock on library instantiated with
   Data.Map = containers-<VERSION>:Data.Map
 for indef-0.1.0.0...
-Documentation created: ../../setup-external-ok.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
+Documentation created: ./repo/indef-0.1.0.0/../../setup-external-ok.dist/work/repo/indef-0.1.0.0/dist/doc/html/indef
 # Setup copy
 Installing library in <PATH>
 # Setup register
-Registering library instantiated with Data.Map = containers-<VERSION>:Data.Map
+Registering library instantiated with
+  Data.Map = containers-<VERSION>:Data.Map
 for indef-0.1.0.0...
 # Setup configure
 Configuring exe-0.1.0.0...

cabal-testsuite/PackageTests/Backpack/Reexport1/setup.cabal.out

@@ -6,7 +6,7 @@ Building library for p-0.1.0.0...
 # Setup haddock
 Preprocessing library for p-0.1.0.0...
 Running Haddock on library for p-0.1.0.0...
-Documentation created: ../setup.cabal.dist/work/p/dist/doc/html/p
+Documentation created: ./p/../setup.cabal.dist/work/p/dist/doc/html/p
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -19,4 +19,4 @@ Building library for q-0.1.0.0...
 # Setup haddock
 Preprocessing library for q-0.1.0.0...
 Running Haddock on library for q-0.1.0.0...
-Documentation created: ../setup.cabal.dist/work/q/dist/doc/html/q
+Documentation created: ./q/../setup.cabal.dist/work/q/dist/doc/html/q

cabal-testsuite/PackageTests/Backpack/Reexport1/setup.out

@@ -6,7 +6,7 @@ Building library for p-0.1.0.0...
 # Setup haddock
 Preprocessing library for p-0.1.0.0...
 Running Haddock on library for p-0.1.0.0...
-Documentation created: ../setup.dist/work/p/dist/doc/html/p
+Documentation created: ./p/../setup.dist/work/p/dist/doc/html/p
 # Setup copy
 Installing library in <PATH>
 # Setup register
@@ -19,4 +19,4 @@ Building library for q-0.1.0.0...
 # Setup haddock
 Preprocessing library for q-0.1.0.0...
 Running Haddock on library for q-0.1.0.0...
-Documentation created: ../setup.dist/work/q/dist/doc/html/q
+Documentation created: ./q/../setup.dist/work/q/dist/doc/html/q

cabal-testsuite/PackageTests/TestNameCollision/setup.cabal.out

@@ -18,5 +18,5 @@ Building test suite 'parent' for child-0.1...
 Running 1 test suites...
 Test suite parent: RUNNING...
 Test suite parent: PASS
-Test suite logged to: ../setup.cabal.dist/work/child/dist/test/child-0.1-parent.log
+Test suite logged to: ./child/../setup.cabal.dist/work/child/dist/test/child-0.1-parent.log
 1 of 1 test suites (1 of 1 test cases) passed.

cabal-testsuite/PackageTests/TestNameCollision/setup.out

@@ -18,5 +18,5 @@ Building test suite 'parent' for child-0.1...
 Running 1 test suites...
 Test suite parent: RUNNING...
 Test suite parent: PASS
-Test suite logged to: ../setup.dist/work/child/dist/test/child-0.1-parent.log
+Test suite logged to: ./child/../setup.dist/work/child/dist/test/child-0.1-parent.log
 1 of 1 test suites (1 of 1 test cases) passed.

cabal-testsuite/Setup.hs

@@ -30,14 +30,19 @@ generateScriptEnvModule lbi verbosity = do
 
     createDirectoryIfMissing True moduledir
     rewriteFileEx verbosity (moduledir </> "ScriptEnv0.hs") $ unlines
-      [ "module Test.Cabal.ScriptEnv0 where"
+      [ "{-# LANGUAGE OverloadedStrings #-}"
+      , "{-# LANGUAGE FlexibleInstances #-}"
+      , "{-# OPTIONS_GHC -Wno-orphans   #-}"
+      , "module Test.Cabal.ScriptEnv0 where"
       , ""
       , "import Distribution.Simple"
       , "import Distribution.System (Platform(..), Arch(..), OS(..))"
       , "import Distribution.Types.ModuleRenaming"
       , "import Distribution.Simple.Program.Db"
       , "import Distribution.Backpack (OpenUnitId)"
       , "import Data.Map (fromList)"
+      , "import Data.String (IsString(..))"
+      , "import Distribution.Utils.Path"
       , ""
       , "lbiPackageDbStack :: PackageDBStackCWD"
       , "lbiPackageDbStack = " ++ show lbiPackageDbStack
@@ -56,6 +61,9 @@ generateScriptEnvModule lbi verbosity = do
       , ""
       , "lbiWithSharedLib :: Bool"
       , "lbiWithSharedLib = " ++ show (withSharedLib lbi)
+      , ""
+      , "instance IsString (SymbolicPath from to) where"
+      , "  fromString = makeSymbolicPath"
       ]
   where
     moduledir = libAutogenDir </> "Test" </> "Cabal"