No longer copy functional tests to the build dir

This should make `_NIX_TEST_ACCEPT=1` work again, fixing #11369.

Progress on #2503

tests/functional/ca/content-addressed.nix

@@ -1,4 +1,4 @@
-with import ./config.nix;
+with import "${builtins.getEnv "_NIX_TEST_BUILD_DIR"}/ca/config.nix";
 
 let mkCADerivation = args: mkDerivation ({
     __contentAddressed = true;

tests/functional/ca/derivation-json.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-#
+
 source common.sh
 
 export NIX_TESTS_CA_BY_DEFAULT=1

tests/functional/ca/duplicate-realisation-in-closure.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-source ./common.sh
+source common.sh
 
 requireDaemonNewerThan "2.4pre20210625"
 

tests/functional/ca/import-from-derivation.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 source common.sh
 
 export NIX_TESTS_CA_BY_DEFAULT=1

tests/functional/ca/meson.build

@@ -29,5 +29,5 @@ suites += {
     'substitute.sh',
     'why-depends.sh',
   ],
-  'workdir': meson.current_build_dir(),
+  'workdir': meson.current_source_dir(),
 }

tests/functional/ca/new-build-cmd.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 source common.sh
 
 export NIX_TESTS_CA_BY_DEFAULT=1

tests/functional/ca/nix-run.sh

@@ -2,6 +2,11 @@
 
 source common.sh
 
-FLAKE_PATH=path:$PWD
+flakeDir="$TEST_HOME/flake"
+mkdir -p "${flakeDir}"
+cp flake.nix "${_NIX_TEST_BUILD_DIR}/ca/config.nix" content-addressed.nix "${flakeDir}"
 
-nix run --no-write-lock-file "$FLAKE_PATH#runnable"
+# `config.nix` cannot be gotten via build dir / env var (runs afoul pure eval). Instead get from flake.
+removeBuildDirRef "$flakeDir"/*.nix
+
+nix run --no-write-lock-file "path:${flakeDir}#runnable"

tests/functional/ca/nix-shell.sh

@@ -5,4 +5,3 @@ source common.sh
 CONTENT_ADDRESSED=true
 cd ..
 source ./nix-shell.sh
-

tests/functional/ca/nondeterministic.nix

@@ -1,4 +1,4 @@
-with import ./config.nix;
+with import "${builtins.getEnv "_NIX_TEST_BUILD_DIR"}/ca/config.nix";
 
 let mkCADerivation = args: mkDerivation ({
     __contentAddressed = true;

tests/functional/ca/racy.nix

@@ -2,7 +2,7 @@
 # build it at once.
 
 
-with import ./config.nix;
+with import "${builtins.getEnv "_NIX_TEST_BUILD_DIR"}/ca/config.nix";
 
 mkDerivation {
   name = "simple";

tests/functional/ca/repl.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 source common.sh
 
 export NIX_TESTS_CA_BY_DEFAULT=1

tests/functional/ca/why-depends.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 source common.sh
 
 export NIX_TESTS_CA_BY_DEFAULT=1