“Dropbox.app” cannot be opened because the developer cannot be verified.

mikepqr commented 4 years ago

General troubleshooting steps

[X] I understand that if I ignore these instructions, my issue may be closed without review.
[X] I have retried my command with --force.
[X] I ran brew update-reset && brew update and retried my command.
[X] I ran brew doctor, fixed as many issues as possible and retried my command.
[X] I have checked the instructions for reporting bugs.
[X] I made doubly sure this is not a checksum does not match error.

Description of issue

I get this error message when I open Dropbox.app after installing it with brew cask install dropbox:

“Dropbox.app” cannot be opened because the developer cannot be verified. macOS cannot verify that this app is free from malware. This file was downloaded on an unknown date.

Screen Shot 2020-06-29 at 15 47 24

I've followed the instructions here to open the app using "Open" from the right-click menu, but I get the same dialog immediately (no option to override).

I have cask installed a number of other applications, which all launch fine:

$ brew cask list -1
font-source-code-pro
netnewswire
nvalt
psequel
sekey
syncthing

Command that failed

brew cask install dropbox

Output of command with `--force --verbose --debug`

$ brew cask install dropbox --force
Updating Homebrew...
==> Downloading https://www.dropbox.com/download?plat=mac&full=1
==> Downloading from https://clientupdates.dropboxstatic.com/dbx-releng/client/D
######################################################################## 100.0%
==> No SHA-256 checksum defined for Cask 'dropbox', skipping verification.
==> Installing Cask dropbox
==> Moving App 'Dropbox.app' to '/Applications/Dropbox.app'.
🍺  dropbox was successfully installed!

Output of `brew cask doctor`

$ brew cask doctor
==> Homebrew Version
2.4.2-55-g84f3dc4
==> macOS
10.15.5
==> SIP
Enabled
==> Java
N/A
==> xattr issues
<NONE>
==> Gatekeeper support
Enabled
==> Homebrew Cask Install Location
<NONE>
==> Homebrew Cask Staging Location
/usr/local/Caskroom
==> Homebrew Cask Taps:
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask (3600 casks)
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask-fonts (1547 casks)
==> Contents of $LOAD_PATH
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/ruby-macho-2.2.0/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/rubocop-rspec-1.40.0/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/rubocop-performance-1.6.1/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/rexml-3.2.4/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/plist-3.5.0/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/mechanize-2.7.6/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/activesupport-6.0.3.2/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/zeitwerk-2.3.1/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/tzinfo-1.2.7/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/thread_safe-0.3.6/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/i18n-1.8.3/lib
/usr/local/Homebrew/Library/Homebrew/vendor/bundle/bundler/../ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby
/Library/Ruby/Site/2.6.0
/Library/Ruby/Site/2.6.0/universal-darwin19
/Library/Ruby/Site
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/vendor_ruby/2.6.0
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/vendor_ruby/2.6.0/universal-darwin19
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/vendor_ruby
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/universal-darwin19
/usr/local/Homebrew/Library/Homebrew
==> Environment Variables
LC_ALL="en_US.UTF-8"
PATH="/usr/local/Homebrew/Library/Homebrew/shims/scm:/usr/bin:/bin:/usr/sbin:/sbin"
SHELL="/usr/local/bin/bash"

Output of `brew tap`

homebrew/cask
homebrew/cask-fonts
homebrew/core

miccal commented 4 years ago

Does this also happen when you install Dropbox manually?

mikepqr commented 4 years ago

False alarm, sorry. Turns out Dropbox is blocked by IT. Yay IT.

Homebrew / homebrew-cask