Add a cd test

lib/spack/spack/cmd/common/env_utility.py

@@ -100,7 +100,13 @@ def run_command_in_subshell(
 
     if cd_arg:
         prefix = "-" if len(cd_arg) == 1 else "--"
-        location = location_emulator(f"{prefix}{cd_arg}", f"/{spec.dag_hash()}")
+        loc_args = [f"{prefix}{cd_arg}"]
+
+        # don't add spec for cd if using env since spec hash is not the env
+        if not (cd_arg == "e" or cd_arg == "env"):
+            loc_args.append(f"/{spec.dag_hash()}")
+
+        location = location_emulator(*loc_args)
         os.chdir(location)
 
     os.execvp(cmd[0], cmd)

lib/spack/spack/test/cmd/build_env.py

@@ -2,13 +2,18 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
+import os
 import pickle
+import subprocess
 import sys
 
 import pytest
 
 import spack.error
+from spack.cmd.common.env_utility import run_command_in_subshell
+from spack.context import Context
 from spack.main import SpackCommand
+from spack.spec import Spec
 
 build_env = SpackCommand("build-env")
 
@@ -58,6 +63,30 @@ def test_pickle(tmpdir):
         assert "PATH" in environment
 
 
+# TODO params [i, b, c] require a spec that has proceeded with a directory
+# TODO praram [e] requires an active env
+@pytest.mark.parametrize("cd_key", ["r", "spack-root"])
+@pytest.mark.usefixtures("config", "mock_packages", "working_env")
+def test_cd(cd_key, tmpdir, monkeypatch, capfd):
+    """test that a subshell will navigate using spack cd before running commands"""
+    cmd = "pwd" if sys.platform != "win32" else "Get-Location"
+    def mock_execvp(_, args):
+        """os.execvp will kill take over the pytest process when it is successful"""
+        result = subprocess.check_output(args, universal_newlines=True)
+        print(result)
+
+    with tmpdir.as_cwd():
+        monkeypatch.setattr(os, "execvp", mock_execvp)
+
+        pwd = os.getcwd()
+        spec = Spec("zlib").concretized()
+        run_command_in_subshell(spec, Context.BUILD, [cmd], cd_arg=cd_key)
+
+        output = capfd.readouterr()
+        assert pwd not in output.out
+        assert output.err == ""
+
+
 def test_failure_when_uninstalled_deps(config, mock_packages):
     with pytest.raises(
         spack.error.SpackError, match="Not all dependencies of dttop are installed"