SMJobBlessUtil.py and python 3 on Apple Silicon

Try something like this (not a python expert so expecting comments):

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< #! /usr/bin/python 
---
> #! /usr/bin/python3
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<   except subprocess.CalledProcessError, e:
---
>   except subprocess.CalledProcessError as e:
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<     req = subprocess.check_output(args, stderr=open("/dev/null"))
<   except subprocess.CalledProcessError, e:
---
>     req = subprocess.check_output(args, stderr=open("/dev/null"), encoding="utf-8")
>   except subprocess.CalledProcessError as e:
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<     info = plistlib.readPlist(infoPath)
---
>     with open(infoPath, 'rb') as fp:
>       info = plistlib.load(fp)
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<     plistDump = subprocess.check_output(args)
<   except subprocess.CalledProcessError, e:
---
>     plistDump = subprocess.check_output(args, encoding="utf-8")
>   except subprocess.CalledProcessError as e:
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> 
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<     bytes = []
---
>     data = []
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<         bytes.append(int(hexStr, 16))
<     plist = plistlib.readPlistFromString(bytearray(bytes))
---
>         data.append(int(hexStr, 16))
> 
>     plist = plistlib.loads(bytes(data))
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<   if not info.has_key("SMPrivilegedExecutables"):
---
>   if "SMPrivilegedExecutables" not in info:
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<     if not info.has_key("CFBundleInfoDictionaryVersion") or info["CFBundleInfoDictionaryVersion"] != "6.0":
---
>     if "CFBundleInfoDictionaryVersion" not in info or info["CFBundleInfoDictionaryVersion"] != "6.0":
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<     if not info.has_key("CFBundleIdentifier") or info["CFBundleIdentifier"] != os.path.basename(toolPath):
---
>     if "CFBundleIdentifier" not in info or info["CFBundleIdentifier"] != os.path.basename(toolPath):
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<     if not info.has_key("SMAuthorizedClients"):
---
>     if "SMAuthorizedClients" not in info:
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<     if not launchd.has_key("Label") or launchd["Label"] != os.path.basename(toolPath):
---
>     if "Label" not in launchd or launchd["Label"] != os.path.basename(toolPath):
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<     if not toolInfo.has_key("CFBundleIdentifier"):
---
>     if "CFBundleIdentifier" not in toolInfo:
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<     if not isinstance(bundleID, basestring):
---
>     if not isinstance(bundleID, str):
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<   needsUpdate = not appInfo.has_key("SMPrivilegedExecutables")
---
>   needsUpdate = "SMPrivilegedExecutables" not in appInfo
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<     appToolDictSorted = sorted(appToolDict.iteritems(), key=operator.itemgetter(0))
<     oldAppToolDictSorted = sorted(oldAppToolDict.iteritems(), key=operator.itemgetter(0))
---
>     appToolDictSorted = sorted(appToolDict.items(), key=operator.itemgetter(0))
>     oldAppToolDictSorted = sorted(oldAppToolDict.items(), key=operator.itemgetter(0))
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<     plistlib.writePlist(appInfo, appInfoPlistPath)
<     print >> sys.stdout, "%s: updated" % appInfoPlistPath
---
>     with open(appInfoPlistPath, 'wb') as fp:
>       plistlib.dump(appInfo, fp)
>     print ("%s: updated" % appInfoPlistPath, file = sys.stdout)
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<     needsUpdate = not toolInfo.has_key("SMAuthorizedClients")
---
>     needsUpdate = "SMAuthorizedClients" not in toolInfo
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<       print >> sys.stdout, "%s: updated" % toolInfoPlistPath
---
>       print("%s: updated" % toolInfoPlistPath, file = sys.stdout)
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<   except CheckException, e:
---
>   except CheckException as e:
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<       print >> sys.stderr, "%s: %s" % (os.path.basename(sys.argv[0]), e.message)
---
>       print("%s: %s" % (os.path.basename(sys.argv[0]), e.message), file = sys.stderr)
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<       print >> sys.stderr, "%s: %s" % (path, e.message)
---
>       print("%s: %s" % (path, e.message), file = sys.stderr)
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<   except UsageException, e:
<     print >> sys.stderr, "usage: %s check /path/to/app" % os.path.basename(sys.argv[0])
<     print >> sys.stderr, "    %s setreq /path/to/app /path/to/app/Info.plist /path/to/tool/Info.plist..." % os.path.basename(sys.argv[0])
---
>   except UsageException as e:
>     print("usage: %s check /path/to/app" % os.path.basename(sys.argv[0]), file = sys.stderr)
>     print("    %s setreq /path/to/app /path/to/app/Info.plist /path/to/tool/Info.plist..." % os.path.basename(sys.argv[0]), file = sys.stderr)

@mikeyh Thank you so much for this. I have just tried your patched code and it is working in my build process.

I'll refrain from marking your solution as accepted for now, just in case there are more comments/improvements from others, but it seems to be working fine.

Updated version with workaround for otool arm64 weirdness: https://gist.github.com/mikeyh/89a1e2ecc6849ff6056b7391c5216799