Module: Cask::Quarantine Private

Extended by:
SystemCommand::Mixin
Defined in:
cask/quarantine.rb

Overview

This module is part of a private API. This module may only be used in the Homebrew/brew repository. Third parties should avoid using this module if possible, as it may be removed or changed without warning.

Helper module for quarantining files.

Constant Summary collapse

QUARANTINE_ATTRIBUTE =

This constant is part of a private API. This constant may only be used in the Homebrew/brew repository. Third parties should avoid using this constant if possible, as it may be removed or changed without warning. 

"com.apple.quarantine"
QUARANTINE_SCRIPT =

This constant is part of a private API. This constant may only be used in the Homebrew/brew repository. Third parties should avoid using this constant if possible, as it may be removed or changed without warning. 

(HOMEBREW_LIBRARY_PATH/"cask/utils/quarantine.swift").freeze
COPY_XATTRS_SCRIPT =

This constant is part of a private API. This constant may only be used in the Homebrew/brew repository. Third parties should avoid using this constant if possible, as it may be removed or changed without warning. 

(HOMEBREW_LIBRARY_PATH/"cask/utils/copy-xattrs.swift").freeze

Class Method Summary collapse

Methods included from SystemCommand::Mixin

system_command, system_command!

Class Method Details

.app_management_permissions_granted?(app:, command:) ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Ensures that Homebrew has permission to update apps on macOS Ventura. This may be granted either through the App Management toggle or the Full Disk Access toggle. The system will only show a prompt for App Management, so we ask the user to grant that.

Parameters:

Returns:

  • (Boolean) 


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# File 'cask/quarantine.rb', line 208

def self.app_management_permissions_granted?(app:, command:)
  return true unless app.directory?

  # To get macOS to prompt the user for permissions, we need to actually attempt to
  # modify a file in the app.
  test_file = app/".homebrew-write-test"

  # We can't use app.writable? here because that conflates several access checks,
  # including both file ownership and whether system permissions are granted.
  # Here we just want to check whether sudo would be needed.
  looks_writable_without_sudo = if app.owned?
    app.lstat.mode.anybits?(0200)
  elsif app.grpowned?
    app.lstat.mode.anybits?(0020)
  else
    app.lstat.mode.anybits?(0002)
  end

  if looks_writable_without_sudo
    begin
      File.write(test_file, "")
      test_file.delete
      return true
    rescue Errno::EACCES, Errno::EPERM
      # Using error handler below
    end
  else
    begin
      command.run!(
        "touch",
        args:         [
          test_file,
        ],
        print_stderr: false,
        sudo:         true,
      )
      command.run!(
        "rm",
        args:         [
          test_file,
        ],
        print_stderr: false,
        sudo:         true,
      )
      return true
    rescue ErrorDuringExecution => e
      # We only want to handle "touch" errors here; propagate "sudo" errors up
      raise e unless e.stderr.include?("touch: #{test_file}: Operation not permitted")
    end
  end

  # Allow undocumented way to skip the prompt.
  if ENV["HOMEBREW_NO_APP_MANAGEMENT_PERMISSIONS_PROMPT"]
    opoo <<~EOF
      Your terminal does not have App Management permissions, so Homebrew will delete and reinstall the app.
      This may result in some configurations (like notification settings or location in the Dock/Launchpad) being lost.
      To fix this, go to System Settings → Privacy & Security → App Management and add or enable your terminal.
    EOF
  end

  false
end

.available? ⇒ Boolean

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:

  • (Boolean) 


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# File 'cask/quarantine.rb', line 69

def self.available?
  @status ||= check_quarantine_support

  @status == :quarantine_available
end

.cask!(cask: nil, download_path: nil, action: true) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'cask/quarantine.rb', line 123

def self.cask!(cask: nil, download_path: nil, action: true)
  return if cask.nil? || download_path.nil?

  return if detect(download_path)

  odebug "Quarantining #{download_path}"

  quarantiner = system_command(swift,
                               args:         [
                                 *swift_target_args,
                                 QUARANTINE_SCRIPT,
                                 download_path,
                                 cask.url.to_s,
                                 cask.homepage.to_s,
                               ],
                               print_stderr: false)

  return if quarantiner.success?

  case quarantiner.exit_status
  when 2
    raise CaskQuarantineError.new(download_path, "Insufficient parameters")
  else
    raise CaskQuarantineError.new(download_path, quarantiner.stderr)
  end
end

.check_quarantine_support ⇒ Symbol

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Returns:



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# File 'cask/quarantine.rb', line 44

def self.check_quarantine_support
  odebug "Checking quarantine support"

  if xattr.nil? || !system_command(xattr, args: ["-h"], print_stderr: false).success?
    odebug "There's no working version of `xattr` on this system."
    :xattr_broken
  elsif swift.nil?
    odebug "Swift is not available on this system."
    :no_swift
  else
    api_check = system_command(swift,
                               args:         [*swift_target_args, QUARANTINE_SCRIPT],
                               print_stderr: false)

    case api_check.exit_status
    when 2
      odebug "Quarantine is available."
      :quarantine_available
    else
      odebug "Unknown support status"
      :unknown
    end
  end
end

.copy_xattrs(from, to, command:) ⇒ void

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

This method returns an undefined value.

Parameters:



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# File 'cask/quarantine.rb', line 189

def self.copy_xattrs(from, to, command:)
  odebug "Copying xattrs from #{from} to #{to}"

  command.run!(
    swift,
    args: [
      *swift_target_args,
      COPY_XATTRS_SCRIPT,
      from,
      to,
    ],
    sudo: !to.writable?,
  )
end

.detect(file) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'cask/quarantine.rb', line 75

def self.detect(file)
  return if file.nil?

  odebug "Verifying Gatekeeper status of #{file}"

  quarantine_status = !status(file).empty?

  odebug "#{file} is #{quarantine_status ? "quarantined" : "not quarantined"}"

  quarantine_status
end

.propagate(from: nil, to: nil) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Raises:



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# File 'cask/quarantine.rb', line 150

def self.propagate(from: nil, to: nil)
  return if from.nil? || to.nil?

  raise CaskError, "#{from} was not quarantined properly." unless detect(from)

  odebug "Propagating quarantine from #{from} to #{to}"

  quarantine_status = toggle_no_translocation_bit(status(from))

  resolved_paths = Pathname.glob(to/"**/*", File::FNM_DOTMATCH).reject(&:symlink?)

  system_command!("/usr/bin/xargs",
                  args:  [
                    "-0",
                    "--",
                    "/bin/chmod",
                    "-h",
                    "u+w",
                  ],
                  input: resolved_paths.join("\0"))

  quarantiner = system_command("/usr/bin/xargs",
                               args:         [
                                 "-0",
                                 "--",
                                 xattr,
                                 "-w",
                                 QUARANTINE_ATTRIBUTE,
                                 quarantine_status,
                               ],
                               input:        resolved_paths.join("\0"),
                               print_stderr: false)

  return if quarantiner.success?

  raise CaskQuarantinePropagationError.new(to, quarantiner.stderr)
end

.release!(download_path: nil) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning.

Raises:



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# File 'cask/quarantine.rb', line 105

def self.release!(download_path: nil)
  return unless detect(download_path)

  odebug "Releasing #{download_path} from quarantine"

  quarantiner = system_command(xattr,
                               args:         [
                                 "-d",
                                 QUARANTINE_ATTRIBUTE,
                                 download_path,
                               ],
                               print_stderr: false)

  return if quarantiner.success?

  raise CaskQuarantineReleaseError.new(download_path, quarantiner.stderr)
end

.status(file) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'cask/quarantine.rb', line 87

def self.status(file)
  system_command(xattr,
                 args:         ["-p", QUARANTINE_ATTRIBUTE, file],
                 print_stderr: false).stdout.rstrip
end

.toggle_no_translocation_bit(attribute) ⇒ Object

This method is part of a private API. This method may only be used in the Homebrew/brew repository. Third parties should avoid using this method if possible, as it may be removed or changed without warning. 



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# File 'cask/quarantine.rb', line 93

def self.toggle_no_translocation_bit(attribute)
  fields = attribute.split(";")

  # Fields: status, epoch, download agent, event ID
  # Let's toggle the app translocation bit, bit 8
  # http://www.openradar.me/radar?id=5022734169931776

  fields[0] = (fields[0].to_i(16) | 0x0100).to_s(16).rjust(4, "0")

  fields.join(";")
end