Remove erroneous warnings about quotes for from_source_file (#22767)

lib/spack/spack/util/environment.py

@@ -942,7 +942,9 @@ def _source_single_file(file_and_args, environment):
             source_file, suppress_output,
             concatenate_on_success, dump_environment,
         ])
-        output = shell(source_file_arguments, output=str, env=environment)
+        output = shell(
+            source_file_arguments, output=str, env=environment, ignore_quotes=True
+        )
         environment = json.loads(output)
 
         # If we're in python2, convert to str objects instead of unicode

lib/spack/spack/util/executable.py

@@ -92,6 +92,8 @@ def __call__(self, *args, **kwargs):
             ignore_errors (int or list): A list of error codes to ignore.
                 If these codes are returned, this process will not raise
                 an exception even if ``fail_on_error`` is set to ``True``
+            ignore_quotes (bool): If False, warn users that quotes are not needed
+                as Spack does not use a shell. Defaults to False.
             input: Where to read stdin from
             output: Where to send stdout
             error: Where to send stderr
@@ -140,6 +142,7 @@ def __call__(self, *args, **kwargs):
 
         fail_on_error = kwargs.pop('fail_on_error', True)
         ignore_errors = kwargs.pop('ignore_errors', ())
+        ignore_quotes = kwargs.pop('ignore_quotes', False)
 
         # If they just want to ignore one error code, make it a tuple.
         if isinstance(ignore_errors, int):
@@ -164,15 +167,18 @@ def streamify(arg, mode):
         estream, close_estream = streamify(error,  'w')
         istream, close_istream = streamify(input,  'r')
 
-        quoted_args = [arg for arg in args if re.search(r'^"|^\'|"$|\'$', arg)]
-        if quoted_args:
-            tty.warn(
-                "Quotes in command arguments can confuse scripts like"
-                " configure.",
-                "The following arguments may cause problems when executed:",
-                str("\n".join(["    " + arg for arg in quoted_args])),
-                "Quotes aren't needed because spack doesn't use a shell.",
-                "Consider removing them")
+        if not ignore_quotes:
+            quoted_args = [arg for arg in args if re.search(r'^"|^\'|"$|\'$', arg)]
+            if quoted_args:
+                tty.warn(
+                    "Quotes in command arguments can confuse scripts like"
+                    " configure.",
+                    "The following arguments may cause problems when executed:",
+                    str("\n".join(["    " + arg for arg in quoted_args])),
+                    "Quotes aren't needed because spack doesn't use a shell. "
+                    "Consider removing them.",
+                    "If multiple levels of quotation are required, use "
+                    "`ignore_quotes=True`.")
 
         cmd = self.exe + list(args)