1870249 - `./mach bootstrap` fails if mercurial is not installed

Status: RESOLVED DUPLICATE of bug 1870175

(Firefox Build System :: Bootstrap Configuration, defect)

Description

[Kagami Rosylight [:saschanaz] (they/them)]

> ./mach bootstrap 
Error running mach:

    mach bootstrap

The error occurred in code that was called by the mach command. This is either
a bug in the called code itself or in the way that mach is calling it.
You can invoke ``./mach busted`` to check if this issue is already on file. If it
isn't, please use ``./mach busted file bootstrap`` to report it. If ``./mach busted`` is
misbehaving, you can also inspect the dependencies of bug 1543241.

If filing a bug, please include the full output of mach, including this error
message.

The details of the failure are as follows:

FileNotFoundError: [WinError 2] The system cannot find the file specified

  File "D:\gecko\python\mozboot\mozboot\mach_commands.py", line 50, in bootstrap
    bootstrapper.bootstrap(command_context.settings)
  File "d:\gecko\python\mozboot\mozboot\bootstrap.py", line 358, in bootstrap
    check_for_hgrc_state_dir_mismatch(state_dir)
  File "d:\gecko\python\mozboot\mozboot\bootstrap.py", line 175, in check_for_hgrc_state_dir_mismatch
    result = subprocess.run(
             ^^^^^^^^^^^^^^^
  File "C:\Users\sasch\AppData\Local\Programs\Python\Python311\Lib\subprocess.py", line 548, in run
    with Popen(*popenargs, **kwargs) as process:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "d:\gecko\third_party\python\sentry_sdk\sentry_sdk\integrations\stdlib.py", line 190, in sentry_patched_popen_init
    rv = old_popen_init(self, *a, **kw)  # type: ignore
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\sasch\AppData\Local\Programs\Python\Python311\Lib\subprocess.py", line 1026, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Users\sasch\AppData\Local\Programs\Python\Python311\Lib\subprocess.py", line 1538, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sentry event ID: 9a75174e7c2b4933b8d1ee951100587b

Reverting bug 1842692 fixes it.