3 files changed, 308 insertions, 285 deletions

diff --git a/lib/python/qmk/cli/doctor.py b/lib/python/qmk/cli/doctor.py
index ea1113c64..70f32911a 100755
--- a/lib/python/qmk/cli/doctor.py
+++ b/lib/python/qmk/cli/doctor.py
@@ -3,293 +3,13 @@
 Check out the user's QMK environment and make sure it's ready to compile.
 """
 import platform
-import re
-import shutil
-import subprocess
-from pathlib import Path
-from enum import Enum
 
 from milc import cli
 from milc.questions import yesno
 from qmk import submodules
 from qmk.constants import QMK_FIRMWARE
 from qmk.commands import run
-
-
-class CheckStatus(Enum):
-    OK = 1
-    WARNING = 2
-    ERROR = 3
-
-
-ESSENTIAL_BINARIES = {
-    'dfu-programmer': {},
-    'avrdude': {},
-    'dfu-util': {},
-    'avr-gcc': {
-        'version_arg': '-dumpversion'
-    },
-    'arm-none-eabi-gcc': {
-        'version_arg': '-dumpversion'
-    },
-    'bin/qmk': {},
-}
-
-
-def _udev_rule(vid, pid=None, *args):
-    """ Helper function that return udev rules
-    """
-    rule = ""
-    if pid:
-        rule = 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", ATTRS{idProduct}=="%s", TAG+="uaccess"' % (
-            vid,
-            pid,
-        )
-    else:
-        rule = 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", TAG+="uaccess"' % vid
-    if args:
-        rule = ', '.join([rule, *args])
-    return rule
-
-
-def _deprecated_udev_rule(vid, pid=None):
-    """ Helper function that return udev rules
-
-    Note: these are no longer the recommended rules, this is just used to check for them
-    """
-    if pid:
-        return 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", ATTRS{idProduct}=="%s", MODE:="0666"' % (vid, pid)
-    else:
-        return 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", MODE:="0666"' % vid
-
-
-def parse_gcc_version(version):
-    m = re.match(r"(\d+)(?:\.(\d+))?(?:\.(\d+))?", version)
-
-    return {
-        'major': int(m.group(1)),
-        'minor': int(m.group(2)) if m.group(2) else 0,
-        'patch': int(m.group(3)) if m.group(3) else 0,
-    }
-
-
-def check_arm_gcc_version():
-    """Returns True if the arm-none-eabi-gcc version is not known to cause problems.
-    """
-    if 'output' in ESSENTIAL_BINARIES['arm-none-eabi-gcc']:
-        version_number = ESSENTIAL_BINARIES['arm-none-eabi-gcc']['output'].strip()
-        cli.log.info('Found arm-none-eabi-gcc version %s', version_number)
-
-    return CheckStatus.OK  # Right now all known arm versions are ok
-
-
-def check_avr_gcc_version():
-    """Returns True if the avr-gcc version is not known to cause problems.
-    """
-    rc = CheckStatus.ERROR
-    if 'output' in ESSENTIAL_BINARIES['avr-gcc']:
-        version_number = ESSENTIAL_BINARIES['avr-gcc']['output'].strip()
-
-        cli.log.info('Found avr-gcc version %s', version_number)
-        rc = CheckStatus.OK
-
-        parsed_version = parse_gcc_version(version_number)
-        if parsed_version['major'] > 8:
-            cli.log.warning('{fg_yellow}We do not recommend avr-gcc newer than 8. Downgrading to 8.x is recommended.')
-            rc = CheckStatus.WARNING
-
-    return rc
-
-
-def check_avrdude_version():
-    if 'output' in ESSENTIAL_BINARIES['avrdude']:
-        last_line = ESSENTIAL_BINARIES['avrdude']['output'].split('\n')[-2]
-        version_number = last_line.split()[2][:-1]
-        cli.log.info('Found avrdude version %s', version_number)
-
-    return CheckStatus.OK
-
-
-def check_dfu_util_version():
-    if 'output' in ESSENTIAL_BINARIES['dfu-util']:
-        first_line = ESSENTIAL_BINARIES['dfu-util']['output'].split('\n')[0]
-        version_number = first_line.split()[1]
-        cli.log.info('Found dfu-util version %s', version_number)
-
-    return CheckStatus.OK
-
-
-def check_dfu_programmer_version():
-    if 'output' in ESSENTIAL_BINARIES['dfu-programmer']:
-        first_line = ESSENTIAL_BINARIES['dfu-programmer']['output'].split('\n')[0]
-        version_number = first_line.split()[1]
-        cli.log.info('Found dfu-programmer version %s', version_number)
-
-    return CheckStatus.OK
-
-
-def check_binaries():
-    """Iterates through ESSENTIAL_BINARIES and tests them.
-    """
-    ok = True
-
-    for binary in sorted(ESSENTIAL_BINARIES):
-        if not is_executable(binary):
-            ok = False
-
-    return ok
-
-
-def check_submodules():
-    """Iterates through all submodules to make sure they're cloned and up to date.
-    """
-    for submodule in submodules.status().values():
-        if submodule['status'] is None:
-            cli.log.error('Submodule %s has not yet been cloned!', submodule['name'])
-            return CheckStatus.ERROR
-        elif not submodule['status']:
-            cli.log.warning('Submodule %s is not up to date!', submodule['name'])
-            return CheckStatus.WARNING
-
-    return CheckStatus.OK
-
-
-def check_git_repo():
-    """Checks that the .git directory exists inside QMK_HOME.
-
-    This is a decent enough indicator that the qmk_firmware directory is a
-    proper Git repository, rather than a .zip download from GitHub.
-    """
-    dot_git_dir = QMK_FIRMWARE / '.git'
-
-    return CheckStatus.OK if dot_git_dir.is_dir() else CheckStatus.WARNING
-
-
-def check_udev_rules():
-    """Make sure the udev rules look good.
-    """
-    rc = CheckStatus.OK
-    udev_dir = Path("/etc/udev/rules.d/")
-    desired_rules = {
-        'atmel-dfu': {
-            _udev_rule("03eb", "2fef"),  # ATmega16U2
-            _udev_rule("03eb", "2ff0"),  # ATmega32U2
-            _udev_rule("03eb", "2ff3"),  # ATmega16U4
-            _udev_rule("03eb", "2ff4"),  # ATmega32U4
-            _udev_rule("03eb", "2ff9"),  # AT90USB64
-            _udev_rule("03eb", "2ffb")  # AT90USB128
-        },
-        'kiibohd': {_udev_rule("1c11", "b007")},
-        'stm32': {
-            _udev_rule("1eaf", "0003"),  # STM32duino
-            _udev_rule("0483", "df11")  # STM32 DFU
-        },
-        'bootloadhid': {_udev_rule("16c0", "05df")},
-        'usbasploader': {_udev_rule("16c0", "05dc")},
-        'massdrop': {_udev_rule("03eb", "6124", 'ENV{ID_MM_DEVICE_IGNORE}="1"')},
-        'caterina': {
-            # Spark Fun Electronics
-            _udev_rule("1b4f", "9203", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Pro Micro 3V3/8MHz
-            _udev_rule("1b4f", "9205", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Pro Micro 5V/16MHz
-            _udev_rule("1b4f", "9207", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # LilyPad 3V3/8MHz (and some Pro Micro clones)
-            # Pololu EleCTRONICS
-            _udev_rule("1ffb", "0101", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # A-Star 32U4
-            # Arduino SA
-            _udev_rule("2341", "0036", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Leonardo
-            _udev_rule("2341", "0037", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Micro
-            # Adafruit INDUSTRIES llC
-            _udev_rule("239a", "000c", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Feather 32U4
-            _udev_rule("239a", "000d", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # ItsyBitsy 32U4 3V3/8MHz
-            _udev_rule("239a", "000e", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # ItsyBitsy 32U4 5V/16MHz
-            # dog hunter ag
-            _udev_rule("2a03", "0036", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Leonardo
-            _udev_rule("2a03", "0037", 'ENV{ID_MM_DEVICE_IGNORE}="1"')  # Micro
-        }
-    }
-
-    # These rules are no longer recommended, only use them to check for their presence.
-    deprecated_rules = {
-        'atmel-dfu': {_deprecated_udev_rule("03eb", "2ff4"), _deprecated_udev_rule("03eb", "2ffb"), _deprecated_udev_rule("03eb", "2ff0")},
-        'kiibohd': {_deprecated_udev_rule("1c11")},
-        'stm32': {_deprecated_udev_rule("1eaf", "0003"), _deprecated_udev_rule("0483", "df11")},
-        'bootloadhid': {_deprecated_udev_rule("16c0", "05df")},
-        'caterina': {'ATTRS{idVendor}=="2a03", ENV{ID_MM_DEVICE_IGNORE}="1"', 'ATTRS{idVendor}=="2341", ENV{ID_MM_DEVICE_IGNORE}="1"'},
-        'tmk': {_deprecated_udev_rule("feed")}
-    }
-
-    if udev_dir.exists():
-        udev_rules = [rule_file for rule_file in udev_dir.glob('*.rules')]
-        current_rules = set()
-
-        # Collect all rules from the config files
-        for rule_file in udev_rules:
-            for line in rule_file.read_text().split('\n'):
-                line = line.strip()
-                if not line.startswith("#") and len(line):
-                    current_rules.add(line)
-
-        # Check if the desired rules are among the currently present rules
-        for bootloader, rules in desired_rules.items():
-            if not rules.issubset(current_rules):
-                deprecated_rule = deprecated_rules.get(bootloader)
-                if deprecated_rule and deprecated_rule.issubset(current_rules):
-                    cli.log.warning("{fg_yellow}Found old, deprecated udev rules for '%s' boards. The new rules on https://docs.qmk.fm/#/faq_build?id=linux-udev-rules offer better security with the same functionality.", bootloader)
-                else:
-                    # For caterina, check if ModemManager is running
-                    if bootloader == "caterina":
-                        if check_modem_manager():
-                            rc = CheckStatus.WARNING
-                            cli.log.warning("{fg_yellow}Detected ModemManager without the necessary udev rules. Please either disable it or set the appropriate udev rules if you are using a Pro Micro.")
-                    rc = CheckStatus.WARNING
-                    cli.log.warning("{fg_yellow}Missing or outdated udev rules for '%s' boards. Run 'sudo cp %s/util/udev/50-qmk.rules /etc/udev/rules.d/'.", bootloader, QMK_FIRMWARE)
-
-    else:
-        cli.log.warning("{fg_yellow}'%s' does not exist. Skipping udev rule checking...", udev_dir)
-
-    return rc
-
-
-def check_systemd():
-    """Check if it's a systemd system
-    """
-    return bool(shutil.which("systemctl"))
-
-
-def check_modem_manager():
-    """Returns True if ModemManager is running.
-
-    """
-    if check_systemd():
-        mm_check = run(["systemctl", "--quiet", "is-active", "ModemManager.service"], timeout=10)
-        if mm_check.returncode == 0:
-            return True
-    else:
-        """(TODO): Add check for non-systemd systems
-        """
-    return False
-
-
-def is_executable(command):
-    """Returns True if command exists and can be executed.
-    """
-    # Make sure the command is in the path.
-    res = shutil.which(command)
-    if res is None:
-        cli.log.error("{fg_red}Can't find %s in your path.", command)
-        return False
-
-    # Make sure the command can be executed
-    version_arg = ESSENTIAL_BINARIES[command].get('version_arg', '--version')
-    check = run([command, version_arg], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=5, universal_newlines=True)
-
-    ESSENTIAL_BINARIES[command]['output'] = check.stdout
-
-    if check.returncode in [0, 1]:  # Older versions of dfu-programmer exit 1
-        cli.log.debug('Found {fg_cyan}%s', command)
-        return True
-
-    cli.log.error("{fg_red}Can't run `%s %s`", command, version_arg)
-    return False
+from qmk.os_helpers import CheckStatus, check_binaries, check_binary_versions, check_submodules, check_git_repo
 
 
 def os_tests():
@@ -312,6 +32,7 @@ def os_test_linux():
     """Run the Linux specific tests.
     """
     cli.log.info("Detected {fg_cyan}Linux.")
+    from qmk.os_helpers.linux import check_udev_rules
 
     return check_udev_rules()
 
@@ -370,10 +91,7 @@ def doctor(cli):
         status = CheckStatus.ERROR
 
     # Make sure the tools are at the correct version
-    ver_ok = []
-    for check in (check_arm_gcc_version, check_avr_gcc_version, check_avrdude_version, check_dfu_util_version, check_dfu_programmer_version):
-        ver_ok.append(check())
-
+    ver_ok = check_binary_versions()
     if CheckStatus.ERROR in ver_ok:
         status = CheckStatus.ERROR
     elif CheckStatus.WARNING in ver_ok and status == CheckStatus.OK:
diff --git a/lib/python/qmk/os_helpers/__init__.py b/lib/python/qmk/os_helpers/__init__.py
new file mode 100644
index 000000000..3f64a63a3
--- /dev/null
+++ b/lib/python/qmk/os_helpers/__init__.py
@@ -0,0 +1,165 @@
+"""OS-agnostic helper functions
+"""
+from enum import Enum
+import re
+import shutil
+import subprocess
+
+from milc import cli
+from qmk.commands import run
+from qmk import submodules
+from qmk.constants import QMK_FIRMWARE
+
+
+class CheckStatus(Enum):
+    OK = 1
+    WARNING = 2
+    ERROR = 3
+
+
+ESSENTIAL_BINARIES = {
+    'dfu-programmer': {},
+    'avrdude': {},
+    'dfu-util': {},
+    'avr-gcc': {
+        'version_arg': '-dumpversion'
+    },
+    'arm-none-eabi-gcc': {
+        'version_arg': '-dumpversion'
+    },
+    'bin/qmk': {},
+}
+
+
+def parse_gcc_version(version):
+    m = re.match(r"(\d+)(?:\.(\d+))?(?:\.(\d+))?", version)
+
+    return {
+        'major': int(m.group(1)),
+        'minor': int(m.group(2)) if m.group(2) else 0,
+        'patch': int(m.group(3)) if m.group(3) else 0,
+    }
+
+
+def check_arm_gcc_version():
+    """Returns True if the arm-none-eabi-gcc version is not known to cause problems.
+    """
+    if 'output' in ESSENTIAL_BINARIES['arm-none-eabi-gcc']:
+        version_number = ESSENTIAL_BINARIES['arm-none-eabi-gcc']['output'].strip()
+        cli.log.info('Found arm-none-eabi-gcc version %s', version_number)
+
+    return CheckStatus.OK  # Right now all known arm versions are ok
+
+
+def check_avr_gcc_version():
+    """Returns True if the avr-gcc version is not known to cause problems.
+    """
+    rc = CheckStatus.ERROR
+    if 'output' in ESSENTIAL_BINARIES['avr-gcc']:
+        version_number = ESSENTIAL_BINARIES['avr-gcc']['output'].strip()
+
+        cli.log.info('Found avr-gcc version %s', version_number)
+        rc = CheckStatus.OK
+
+        parsed_version = parse_gcc_version(version_number)
+        if parsed_version['major'] > 8:
+            cli.log.warning('{fg_yellow}We do not recommend avr-gcc newer than 8. Downgrading to 8.x is recommended.')
+            rc = CheckStatus.WARNING
+
+    return rc
+
+
+def check_avrdude_version():
+    if 'output' in ESSENTIAL_BINARIES['avrdude']:
+        last_line = ESSENTIAL_BINARIES['avrdude']['output'].split('\n')[-2]
+        version_number = last_line.split()[2][:-1]
+        cli.log.info('Found avrdude version %s', version_number)
+
+    return CheckStatus.OK
+
+
+def check_dfu_util_version():
+    if 'output' in ESSENTIAL_BINARIES['dfu-util']:
+        first_line = ESSENTIAL_BINARIES['dfu-util']['output'].split('\n')[0]
+        version_number = first_line.split()[1]
+        cli.log.info('Found dfu-util version %s', version_number)
+
+    return CheckStatus.OK
+
+
+def check_dfu_programmer_version():
+    if 'output' in ESSENTIAL_BINARIES['dfu-programmer']:
+        first_line = ESSENTIAL_BINARIES['dfu-programmer']['output'].split('\n')[0]
+        version_number = first_line.split()[1]
+        cli.log.info('Found dfu-programmer version %s', version_number)
+
+    return CheckStatus.OK
+
+
+def check_binaries():
+    """Iterates through ESSENTIAL_BINARIES and tests them.
+    """
+    ok = True
+
+    for binary in sorted(ESSENTIAL_BINARIES):
+        if not is_executable(binary):
+            ok = False
+
+    return ok
+
+
+def check_binary_versions():
+    """Check the versions of ESSENTIAL_BINARIES
+    """
+    versions = []
+    for check in (check_arm_gcc_version, check_avr_gcc_version, check_avrdude_version, check_dfu_util_version, check_dfu_programmer_version):
+        versions.append(check())
+    return versions
+
+
+def check_submodules():
+    """Iterates through all submodules to make sure they're cloned and up to date.
+    """
+    for submodule in submodules.status().values():
+        if submodule['status'] is None:
+            cli.log.error('Submodule %s has not yet been cloned!', submodule['name'])
+            return CheckStatus.ERROR
+        elif not submodule['status']:
+            cli.log.warning('Submodule %s is not up to date!', submodule['name'])
+            return CheckStatus.WARNING
+
+    return CheckStatus.OK
+
+
+def is_executable(command):
+    """Returns True if command exists and can be executed.
+    """
+    # Make sure the command is in the path.
+    res = shutil.which(command)
+    if res is None:
+        cli.log.error("{fg_red}Can't find %s in your path.", command)
+        return False
+
+    # Make sure the command can be executed
+    version_arg = ESSENTIAL_BINARIES[command].get('version_arg', '--version')
+    check = run([command, version_arg], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=5, universal_newlines=True)
+
+    ESSENTIAL_BINARIES[command]['output'] = check.stdout
+
+    if check.returncode in [0, 1]:  # Older versions of dfu-programmer exit 1
+        cli.log.debug('Found {fg_cyan}%s', command)
+        return True
+
+    cli.log.error("{fg_red}Can't run `%s %s`", command, version_arg)
+    return False
+
+
+def check_git_repo():
+    """Checks that the .git directory exists inside QMK_HOME.
+
+    This is a decent enough indicator that the qmk_firmware directory is a
+    proper Git repository, rather than a .zip download from GitHub.
+    """
+    dot_git_dir = QMK_FIRMWARE / '.git'
+
+    return CheckStatus.OK if dot_git_dir.is_dir() else CheckStatus.WARNING
diff --git a/lib/python/qmk/os_helpers/linux/__init__.py b/lib/python/qmk/os_helpers/linux/__init__.py
new file mode 100644
index 000000000..86850bf28
--- /dev/null
+++ b/lib/python/qmk/os_helpers/linux/__init__.py
@@ -0,0 +1,140 @@
+"""OS-specific functions for: Linux
+"""
+from pathlib import Path
+import shutil
+
+from milc import cli
+from qmk.constants import QMK_FIRMWARE
+from qmk.commands import run
+from qmk.os_helpers import CheckStatus
+
+
+def _udev_rule(vid, pid=None, *args):
+    """ Helper function that return udev rules
+    """
+    rule = ""
+    if pid:
+        rule = 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", ATTRS{idProduct}=="%s", TAG+="uaccess"' % (
+            vid,
+            pid,
+        )
+    else:
+        rule = 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", TAG+="uaccess"' % vid
+    if args:
+        rule = ', '.join([rule, *args])
+    return rule
+
+
+def _deprecated_udev_rule(vid, pid=None):
+    """ Helper function that return udev rules
+
+    Note: these are no longer the recommended rules, this is just used to check for them
+    """
+    if pid:
+        return 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", ATTRS{idProduct}=="%s", MODE:="0666"' % (vid, pid)
+    else:
+        return 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", MODE:="0666"' % vid
+
+
+def check_udev_rules():
+    """Make sure the udev rules look good.
+    """
+    rc = CheckStatus.OK
+    udev_dir = Path("/etc/udev/rules.d/")
+    desired_rules = {
+        'atmel-dfu': {
+            _udev_rule("03eb", "2fef"),  # ATmega16U2
+            _udev_rule("03eb", "2ff0"),  # ATmega32U2
+            _udev_rule("03eb", "2ff3"),  # ATmega16U4
+            _udev_rule("03eb", "2ff4"),  # ATmega32U4
+            _udev_rule("03eb", "2ff9"),  # AT90USB64
+            _udev_rule("03eb", "2ffb")  # AT90USB128
+        },
+        'kiibohd': {_udev_rule("1c11", "b007")},
+        'stm32': {
+            _udev_rule("1eaf", "0003"),  # STM32duino
+            _udev_rule("0483", "df11")  # STM32 DFU
+        },
+        'bootloadhid': {_udev_rule("16c0", "05df")},
+        'usbasploader': {_udev_rule("16c0", "05dc")},
+        'massdrop': {_udev_rule("03eb", "6124", 'ENV{ID_MM_DEVICE_IGNORE}="1"')},
+        'caterina': {
+            # Spark Fun Electronics
+            _udev_rule("1b4f", "9203", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Pro Micro 3V3/8MHz
+            _udev_rule("1b4f", "9205", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Pro Micro 5V/16MHz
+            _udev_rule("1b4f", "9207", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # LilyPad 3V3/8MHz (and some Pro Micro clones)
+            # Pololu Electronics
+            _udev_rule("1ffb", "0101", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # A-Star 32U4
+            # Arduino SA
+            _udev_rule("2341", "0036", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Leonardo
+            _udev_rule("2341", "0037", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Micro
+            # Adafruit Industries LLC
+            _udev_rule("239a", "000c", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Feather 32U4
+            _udev_rule("239a", "000d", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # ItsyBitsy 32U4 3V3/8MHz
+            _udev_rule("239a", "000e", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # ItsyBitsy 32U4 5V/16MHz
+            # dog hunter AG
+            _udev_rule("2a03", "0036", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Leonardo
+            _udev_rule("2a03", "0037", 'ENV{ID_MM_DEVICE_IGNORE}="1"')  # Micro
+        }
+    }
+
+    # These rules are no longer recommended, only use them to check for their presence.
+    deprecated_rules = {
+        'atmel-dfu': {_deprecated_udev_rule("03eb", "2ff4"), _deprecated_udev_rule("03eb", "2ffb"), _deprecated_udev_rule("03eb", "2ff0")},
+        'kiibohd': {_deprecated_udev_rule("1c11")},
+        'stm32': {_deprecated_udev_rule("1eaf", "0003"), _deprecated_udev_rule("0483", "df11")},
+        'bootloadhid': {_deprecated_udev_rule("16c0", "05df")},
+        'caterina': {'ATTRS{idVendor}=="2a03", ENV{ID_MM_DEVICE_IGNORE}="1"', 'ATTRS{idVendor}=="2341", ENV{ID_MM_DEVICE_IGNORE}="1"'},
+        'tmk': {_deprecated_udev_rule("feed")}
+    }
+
+    if udev_dir.exists():
+        udev_rules = [rule_file for rule_file in udev_dir.glob('*.rules')]
+        current_rules = set()
+
+        # Collect all rules from the config files
+        for rule_file in udev_rules:
+            for line in rule_file.read_text().split('\n'):
+                line = line.strip()
+                if not line.startswith("#") and len(line):
+                    current_rules.add(line)
+
+        # Check if the desired rules are among the currently present rules
+        for bootloader, rules in desired_rules.items():
+            if not rules.issubset(current_rules):
+                deprecated_rule = deprecated_rules.get(bootloader)
+                if deprecated_rule and deprecated_rule.issubset(current_rules):
+                    cli.log.warning("{fg_yellow}Found old, deprecated udev rules for '%s' boards. The new rules on https://docs.qmk.fm/#/faq_build?id=linux-udev-rules offer better security with the same functionality.", bootloader)
+                else:
+                    # For caterina, check if ModemManager is running
+                    if bootloader == "caterina":
+                        if check_modem_manager():
+                            rc = CheckStatus.WARNING
+                            cli.log.warning("{fg_yellow}Detected ModemManager without the necessary udev rules. Please either disable it or set the appropriate udev rules if you are using a Pro Micro.")
+                    rc = CheckStatus.WARNING
+                    cli.log.warning("{fg_yellow}Missing or outdated udev rules for '%s' boards. Run 'sudo cp %s/util/udev/50-qmk.rules /etc/udev/rules.d/'.", bootloader, QMK_FIRMWARE)
+
+    else:
+        cli.log.warning("{fg_yellow}'%s' does not exist. Skipping udev rule checking...", udev_dir)
+
+    return rc
+
+
+def check_systemd():
+    """Check if it's a systemd system
+    """
+    return bool(shutil.which("systemctl"))
+
+
+def check_modem_manager():
+    """Returns True if ModemManager is running.
+
+    """
+    if check_systemd():
+        mm_check = run(["systemctl", "--quiet", "is-active", "ModemManager.service"], timeout=10)
+        if mm_check.returncode == 0:
+            return True
+    else:
+        """(TODO): Add check for non-systemd systems
+        """
+    return False