QLMarkdown and QLColorcode fail on Catalina 10.15

[breiter (Brian Reiter)]

Quicklook generators installed by MacPorts do not function properly in Catalina 10.15.0. I have built MacPorts from source on Catalina and reinstalled all of my ports.

Unfortunately, the QuickLook generators -- QLMarkdown and QLColorCode -- build and install but they don't work. Instead of generating quickook previews macOS generates an error that the preview cannot be safely displayed.

[mf2k (Frank Schima)]

In the future, please fill in the Port field.

[ryandesign (Ryan Schmidt)]

If you figure out how to fix it, let us know. Catalina is brand-new, and these ports have no maintainer.

[breiter (Brian Reiter)]

I suspect that QuickLook plugins need to be notarized or they will not be loaded by quicklookd.

​https://developer.apple.com/documentation/xcode/notarizing_your_app_before_distribution?language=objc ​https://developer.apple.com/documentation/xcode/notarizing_your_app_before_distribution/customizing_the_notarization_workflow?language=objc#3087734

[breiter (Brian Reiter)]

QLStephen is also affected.

[ironick09 (Josh Niec)]

In the interim, to manually stop the QL* files from being blocked by Catalina due to developer cannot be verified you can run:

$ xattr -d com.apple.quarantine /path/to/file

For example, to ignore the developer cannot be verified error for QLMarkdown I can run (note I installed it using homebrew but that doesn't change anything):

$ xattr -d com.apple.quarantine ~/Library/QuickLook/QLMarkdown.qlgenerator/Contents/MacOS/QLMarkdown

Your path might be different than mine

Do this for all the ql* file you have downloaded, keep in mind is the definitely not secure as in that you may be running a malicious QL* file. All of my files are stored in ~/Library/QuickLook/QL.*/Contents/MacOS/program