Merge pull request #7915 from ThomasWaldmann/fix-subcommand-env-1.2

create --*-from-command: run subcommands with a clean environment

src/borg/archiver.py

@@ -533,7 +533,8 @@ class Archiver:
                 if not dry_run:
                     try:
                         try:
-                            proc = subprocess.Popen(args.paths, stdout=subprocess.PIPE, preexec_fn=ignore_sigint)
+                            env = prepare_subprocess_env(system=True)
+                            proc = subprocess.Popen(args.paths, stdout=subprocess.PIPE, env=env, preexec_fn=ignore_sigint)
                         except (FileNotFoundError, PermissionError) as e:
                             self.print_error('Failed to execute command: %s', e)
                             return self.exit_code
@@ -552,7 +553,8 @@ class Archiver:
                 paths_sep = eval_escapes(args.paths_delimiter) if args.paths_delimiter is not None else '\n'
                 if args.paths_from_command:
                     try:
-                        proc = subprocess.Popen(args.paths, stdout=subprocess.PIPE, preexec_fn=ignore_sigint)
+                        env = prepare_subprocess_env(system=True)
+                        proc = subprocess.Popen(args.paths, stdout=subprocess.PIPE, env=env, preexec_fn=ignore_sigint)
                     except (FileNotFoundError, PermissionError) as e:
                         self.print_error('Failed to execute command: %s', e)
                         return self.exit_code