Build Functional tests with Meson

Co-Authored-By: Qyriad <qyriad@qyriad.me>
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>

tests/functional/common/vars.sh

@@ -0,0 +1,72 @@
+# shellcheck shell=bash
+
+set -eu -o pipefail
+
+if [[ -z "${COMMON_VARS_SH_SOURCED-}" ]]; then
+
+COMMON_VARS_SH_SOURCED=1
+
+commonDir="$(readlink -f "$(dirname "${BASH_SOURCE[0]-$0}")")"
+
+# Since this is a generated file
+# shellcheck disable=SC1091
+source "$commonDir/subst-vars.sh"
+# Make sure shellcheck knows all these will be defined by the above generated snippet
+: "${bindir?} ${coreutils?} ${dot?} ${SHELL?} ${busybox?} ${version?} ${system?}"
+export coreutils dot busybox version system
+
+export PAGER=cat
+
+source "$commonDir/paths.sh"
+source "$commonDir/test-root.sh"
+
+test_nix_conf_dir=$TEST_ROOT/etc
+# Used in other files
+# shellcheck disable=SC2034
+test_nix_conf=$test_nix_conf_dir/nix.conf
+
+export TEST_HOME=$TEST_ROOT/test-home
+
+if ! isTestOnNixOS; then
+  export NIX_STORE_DIR
+  if ! NIX_STORE_DIR=$(readlink -f "$TEST_ROOT/store" 2> /dev/null); then
+      # Maybe the build directory is symlinked.
+      export NIX_IGNORE_SYMLINK_STORE=1
+      NIX_STORE_DIR=$TEST_ROOT/store
+  fi
+  export NIX_LOCALSTATE_DIR=$TEST_ROOT/var
+  export NIX_LOG_DIR=$TEST_ROOT/var/log/nix
+  export NIX_STATE_DIR=$TEST_ROOT/var/nix
+  export NIX_CONF_DIR=$test_nix_conf_dir
+  export NIX_DAEMON_SOCKET_PATH=$TEST_ROOT/dSocket
+  unset NIX_USER_CONF_FILES
+  export _NIX_TEST_SHARED=$TEST_ROOT/shared
+  if [[ -n $NIX_STORE ]]; then
+      export _NIX_TEST_NO_SANDBOX=1
+  fi
+  export _NIX_IN_TEST=$TEST_ROOT/shared
+  export _NIX_TEST_NO_LSOF=1
+  export NIX_REMOTE=${NIX_REMOTE_-}
+
+fi # ! isTestOnNixOS
+
+unset NIX_PATH
+export HOME=$TEST_HOME
+unset XDG_STATE_HOME
+unset XDG_DATA_HOME
+unset XDG_CONFIG_HOME
+unset XDG_CONFIG_DIRS
+unset XDG_CACHE_HOME
+
+export IMPURE_VAR1=foo
+export IMPURE_VAR2=bar
+
+# Used in other files
+# shellcheck disable=SC2034
+cacheDir=$TEST_ROOT/binary-cache
+
+if [[ $(uname) == Linux ]] && [[ -L /proc/self/ns/user ]] && unshare --user true; then
+    _canUseSandbox=1
+fi
+
+fi # COMMON_VARS_SH_SOURCED