Fix old build

The symlinked `nix-profile.sh.in` was getting rewritten per the `%.in ->
%` rule, which was clobbering the test also named `nix-profile.sh`.

tests/functional/bash-profile.sh

@@ -2,7 +2,7 @@
 
 source common.sh
 
-sed -e "s|@localstatedir@|$TEST_ROOT/profile-var|g" -e "s|@coreutils@|$coreutils|g" < nix-profile.sh.in > "$TEST_ROOT"/nix-profile.sh
+sed -e "s|@localstatedir@|$TEST_ROOT/profile-var|g" -e "s|@coreutils@|$coreutils|g" < ../../scripts/nix-profile.sh.in > "$TEST_ROOT"/nix-profile.sh
 
 user=$(whoami)
 rm -rf "$TEST_HOME" "$TEST_ROOT/profile-var"

tests/functional/meson.build

@@ -22,6 +22,18 @@ run_command(
   meson.current_source_dir() / '',
   meson.current_build_dir() / '',
 )
+# This current-source-escaping relative is no good because we don't know
+# where the build directory will be, therefore we fix it up. Once the
+# Make build system is gone, we should think about doing this better.
+scripts_dir = fs.relative_to(
+  meson.current_source_dir() / '..' / '..' / 'scripts',
+  meson.current_build_dir(),
+)
+run_command(
+  'sed',
+  '-i', meson.current_build_dir() / 'bash-profile.sh',
+  '-e', 's^../../scripts^@0@^'.format(scripts_dir),
+)
 
 nix = find_program('nix')
 bash = find_program('bash', native : true)