Scans all kexts in /System/Library/Extensions and generates a graphml graph representation of the dependencies.

kext_deps.py

import plistlib
import subprocess
import os

def main():
    output = subprocess.check_output(['find', '/System/Library/Extensions', '-name', '*.kext', '-print'])
    
    print('<?xml version="1.0" encoding="UTF-8"?>')
    print('<graphml xmlns="http://graphml.graphdrawing.org/xmlns">')
    print('  <graph id="G" edgedefault="undirected">')
    print('    <node id="Kernel"/>')

    names = {}
    # First pass to build id to kext name mapping
    for line in output.split('\n'):
        line = line.strip()
        if line:
            kext = os.path.splitext(os.path.basename(line))[0] 

            plist = os.path.join(os.path.join(line, 'info.plist'))
            if not os.path.isfile(plist):
                plist = os.path.join(os.path.join(line, 'Contents/info.plist'))
            
            p = plistlib.readPlist(plist)

            deps = {}
            if 'OSBundleLibraries' in  p:
                deps = p['OSBundleLibraries']

            if 'OSBundleLibraries_x86_64' in p:
                deps = p['OSBundleLibraries_x86_64']
            
            if deps:
                names[p['CFBundleIdentifier']] = kext
                print('    <node id="' + kext + '"/>')


    # Second pass to build nodes and edges
    for line in output.split('\n'):
        line = line.strip()
        if line:
            kext = os.path.basename(line)

            plist = os.path.join(os.path.join(line, 'info.plist'))
            if not os.path.isfile(plist):
                plist = os.path.join(os.path.join(line, 'Contents/info.plist'))
            
            p = plistlib.readPlist(plist)

            deps = {}
            if 'OSBundleLibraries' in  p:
                deps = p['OSBundleLibraries']

            if 'OSBundleLibraries_x86_64' in p:
                deps = p['OSBundleLibraries_x86_64']
            
            if deps:
                source = p['CFBundleIdentifier']
                if source in names:
                    source = names[p['CFBundleIdentifier']]

                count = 0
                for key in deps:
                    if not 'kpi' in key:
                        count = count + 1
                        target = key
                        if key in names:
                            target = names[key]

                        print('    <edge source="' +  source + '" target="' + target + '"/>')

                if count == 0:
                    print('    <edge source="' + source + '" target="Kernel" />')



                        
    print('  </graph>')
    print('</graphml>')

if __name__ == '__main__':
   main()