Command line tool camera permission

Question

MesDeveloper OP

Created Nov ’18

Replies 5

Boosts 0

Views 5.7k

Participants 7

I try to write command line tool for recording from a camera using AVfoundation framework.

The problem that stuck my project is camera permission issue. Error message: "This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data".

I added Info.plist with NSCameraUsageDescription key and add request authorization for capture function but it seems that it ignored on runtime. I get the same error message when macOS should shows an alert asking the user to grant app access to the camera (AVCaptureDevice.requestAccess). I familiar with Info.plist and with NSCameraUsageDescription key from ios app that I wrote but it seem that it diffrent in command line tool.

If anyone know how I can solve this privacy issue it will be very helpful.

Thanks.

Boost

Answer 1

hassrahhal OP

Jan ’20

Im having the same issue now, have you found a solution for it?

0

Answer 2

breno.medeiros OP

Mar ’20

SOLUTION:
1) Create a file with your editor, name it Info.plist, with this:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<dict>

<key>NSMicrophoneUsageDescription</key>

<string>This app requires microphone acess to record your greeting.</string>

<key>CFBundleIdentifier</key>

<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>

<key>NSCameraUsageDescription</key>

<string>This app requires camera access to capture your dog photos.</string>

</dict>

</plist>

2) Drag it to your project checking Copy files if needed.

3) Go to Build Phases > Copy Files

4) Destination set to Products Directory
5) Add Info.plist
6) Uncheck “Copy only when installing”

Done! 😀

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Answer 3

elderorb OP

Nov ’20

This issue is still actual: command line tool using avfoundation works only from terminal. Any attempts to launch it over ssh or as external process result in a crash. I've tried to create Info.plist like written above and put it to the folder with a tool - no luck. Also tried to write it to tool's binary as separate section - no luck too. Just for reference, here is the tool: https://github.com/mipops/dvrescue/tree/master/tools/avfctl

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Answer 4

Frameworks Engineer OP

Apple

Mar ’21

You may have luck by creating an Info.plist section in your command line tool's binary. The steps are documented in Adding an Info.plist to Single-File Tools.

Summarizing the steps here:

Create an Info.plist file and make sure it has the keys CFBundleIdentifier and CFBundleName
Add the usage description you need. NSCameraUsageDescription, in your case
In the CLI target's build settings, set "Create Info.plist Section in Binary" to YES
In the CLI target's build settings, set "Info.plist File" to the relative path to the Info.plist file you created in step 1

1

Answer 5

DTS Engineer OP

Apple

Mar ’21

command line tool using avfoundation works only from terminal. Any
attempts to launch it over ssh

I wouldn’t expect that to work. When you log in via SSH your shell runs in a non-GUI login session and, as such, anything that involves the GUI is likely to behave weirdly.

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