This question is for those of you familiar with command-line tools and disk images. I'm stumped!
Previously, I could mount a read-only disk image with a "shadow" file to make it read-write using this command:
hdiutil attach "someDiskImage.dmg" -shadow "someShadowFile.dmg"
However, on Catalina (macOS 10.15) this doesn't work. I'm not sure why or whether it is related to the OS version. Here is the output I get:
-> ls -al total 391168 -rw-r--r--@ 1 myname admin 188484680 Nov 7 2018 example.dmg -rw-r--r-- 1 myname admin 11767808 Nov 7 2018 example.dmg.shadow -> hdiutil attach -shadow example.dmg.shadow example.dmg Usage: hdiutil attach [options] <image> hdiutil attach -help ->
Can anyone help me figure this out? Is -shadow just broken on Catalina? Thanks. Also, can you verify if you can reproduce this issue?