Clicking either one of these opens the DMG file. The DMG mounts in two places: on your desktop and in the Finder sidebar under your hard drive. All you really need to do is double-click the DMG file to open it and mount it to your Mac. Well, luckily macOS does an excellent job of making everything easy. RELATED: Benchmarked: What's the Best File Compression Format? So How Do I Use DMG Files? Saving your data usage on downloads is always a good thing. And that’s second reason why macOS uses DMG files: they’re a compressed format (like a ZIP file) that makes your download smaller. This little window first goes through a phase of verifying the file, and then once it’s sure the file is good, moves on to decompressing it. This is what you see when the file is opening: DMG files include something called a checksum, which basically verifies that the file is 100% intact. But it hardly seemed obvious (or easy to test) when I was first learning notarization.The main reason macOS uses DMG files is to make sure the file downloaded properly and wasn’t tampered with. 1) "Submit the content as it will appear on disk" and 2) "Submit your custom installer". In fact, I just reread the WWDC 2019 notarization presentation slides and it mentions two-step notarization for custom installers. In retrospect this all seems more obvious. Wait for notarization success and staple the dmg.Upload the dmg to Apple for notarization. Wait for notarization success and staple the app.Zip using /usr/bin/ditto -c -k -rsrc -sequesterRsrc -keepParent your.app your.zip Zip the app and upload the app to Apple for notarization.Updated September 27, 2021: My ditto command was missing the flags -rsrc and -sequesterRsrc I believe I've solved the issue by adjusting our build process to notarize twice: But, if Apple's servers are down, or the customer's internet connection is flaky, the check for the notarized app will fail. Origin=Developer ID Application: Decipher Media, LLC (3Z498VWZ9Z)įor most customers, there's no problem, because when they try to open the app inside of the DMG, Gatekeeper simply asks Apple's server if the app is ok and has been notarized. Volumes/Decipher TextMessage/Decipher TextMessage.app: accepted spctl -ignore-cache -assess -vvvv /Volumes/Decipher\ TextMessage/Decipher\ TextMessage.app Processing: /Volumes/Decipher TextMessage/Decipher TextMessage.appĭecipher TextMessage.app does not have a ticket stapled to it.īut the app is notarized if I check it. xcrun stapler validate /Volumes/Decipher\ TextMessage/Decipher\ TextMessage.app Processing: /Users/kwilkerson/Downloads/DecipherTextMessage.dmgīut, of course, the app itself, that was packaged into the disk image before notarizing, doesn't have the ticket attached to it. From visiting friends in San Quentin to accidentally getting into a stalker’s car at the airport to establishing Uganda’s first space program, Bob shows you the way back to an audaciously attentive life.Your undistracted life is an adventure waiting to happen. xcrun stapler validate ~/Downloads/DecipherTextMessage.dmg If I check for a stapled ticket on the notarized and stapled DMG I see the check succeeds. To hammer the point home, let's evaluate one of my old DMGs before I changed my build/notarization process. app file, and the outer DMG ticket doesn't help with this check. What I didn't realize with this process is that there is still a check on the inner. However, there is no ticket attached to the inner. If you submit a DMG for notarization, the inner application is notarized also, and you can attach the notarization ticket to the DMG. Of course, that means I needed to reevaluate how we're notarizing and stapling. The ticket should provide the information needed to do the check offline. But with the stapled notarization ticket, there shouldn't be a need to contact Apple to check the notarization. My assumption here is that due to internet connectivity or Apple server outages/lag, some of our customers are seeing rejections of our notarized apps. In the last couple of weeks, I've gotten a few reports from customers on Catalina that they're getting messages like "Cannot connect to App Store", or the more usual "can't be opened because Apple cannot check it for malicious software" when trying to use or copy or notarized apps. dmg for notarization, stapling the ticket to the disk image after success, and going on our merry way. For the past year and a half, we've handled our Apple notarization by submitting the. We distribute our software for macOS as apps in Apple disk images, or said more simply, we distribute our software as a.
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