Set Acrobat Reader DC As the Default PDF Handler?

What level are you setting the profile to? Computer or User?

User level, then logging out/back in before testing.

I've pasted the plist contents here, just to check I haven't missed anything.

<plist version="1.0">
<dict>
    <key>LSHandlers</key>
    <array>
        <dict>
            <key>LSHandlerPreferredVersions</key>
            <dict>
                <key>LSHandlerRoleAll</key>
                <string>-</string>
            </dict>
            <key>LSHandlerRoleAll</key>
            <string>com.adobe.reader</string>
            <key>LSHandlerURLScheme</key>
            <string>acrobat2018</string>
        </dict>
        <dict>
            <key>LSHandlerContentType</key>
            <string>com.adobe.pdf</string>
            <key>LSHandlerPreferredVersions</key>
            <dict>
                <key>LSHandlerRoleAll</key>
                <string>-</string>
            </dict>
            <key>LSHandlerRoleAll</key>
            <string>com.adobe.reader</string>
        </dict>
    </array>
</dict>
</plist>

The Python command works great, thanks for that! I just saw you've added a version for Reader - I'd already amended your original on our end but thanks a lot for the follow-up! :)

@dsavageED - It seems to work if I run it locally on the test Mac but not via policy. The trigger is recurring check-in and the frequency is set to 'Once per user' (it's a multi-user computer and the preference needs to be global). Does that sound right?

@Ecco_Luke - That sounds about right, how are you actually running the code, is it inside a script or using files and processes?

In either case I believe these will be run as root. I have the code inside a script, which does other configuration, so:

#!/bin/sh

UserName=`python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or [None])[0]; username = [username,""][username in [u"loginwindow", None, u""]]; sys.stdout.write(username + "
");'`

sudo -u ${UserName} python -c 'from LaunchServices import LSSetDefaultRoleHandlerForContentType; LSSetDefaultRoleHandlerForContentType("com.adobe.pdf", 0x00000002, "com.adobe.reader")'

but you might be able to use the jamf defined variable for username which is $3:

sudo -u ${3} python -c 'from LaunchServices import LSSetDefaultRoleHandlerForContentType; LSSetDefaultRoleHandlerForContentType("com.adobe.pdf", 0x00000002, "com.adobe.reader")'

Thanks, @dsavageED. Would that first script run as-is (not the one with the Jamf-defined username variable)? If so, I can test that by replacing my current script with it.

It should do, yes. If you run into an issue, try using /usr/bin/python rather than just python, sometimes the shell can be a bit weird...

Thanks, I'll try that and report back!

It seems to work on one user account but not on any others. It shouldn't matter that not all of the accounts on the computer have admin privileges I assume?

No it shouldn't. The setting is at a user level, so the user will always have rights to their own Library. What is your check-in frequency?

Every 15 minutes. I've also checked the plist for the user account it's not working on but that reads as Reader being set as the default PDF handler... so I'm even more confused!

@dsavageED This has worked on another account that I hadn't yet tampered with, whereas the other account had been altered quite a bit.

This doesn't seem to work with python3.

Any luck getting this to work with python3?