I have an application that builds into a DMG file (via jpackage). As soon as users download the DMG they tell me it is corrupt and should be deleted.
Now I am unfamiliar with that format and I have no access to any Apple Mac to try myself. Just in case jpackage is really building an invalid package I would like to check that before offering such a download.
Is there any way to validate a DMG on Github's MacOS runner?
I found this web page https://macwrench.miraheze.org/wiki/Hdiutil which mentions that hdiutil supports a number of commands that are useful for validating a DMG file:
hdiutil verify -verbose <dmg>
hdiutil imageinfo -verbose <dmg>
hdiutil hfsanalyze -verbose <dmg>
hdiutil checksum -type SHA256 -verbose <dmg>
hdiutil info -verbose
hdiutil pmap -verbose <dmg>
The first one already gave me output that ended like this:
hdiutil: verify: checksum of "<dmg>" is VALID
verified CRC32 $9D7EB279
So with this I can trust my generated file and should look for issues on the download or user side.