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require "set"
require "tempfile"
require "hbc/container/base"
module Hbc
class Container
class Dmg < Base
def self.me?(criteria)
!criteria.command.run("/usr/bin/hdiutil",
# realpath is a failsafe against unusual filenames
args: ["imageinfo", Pathname.new(criteria.path).realpath],
print_stderr: false).stdout.empty?
end
def extract
mount do |mounts|
begin
raise CaskError, "No mounts found in '#{@path}'; perhaps it is a bad DMG?" if mounts.empty?
mounts.each(&method(:extract_mount))
ensure
mounts.each(&method(:eject))
end
end
end
def mount
# realpath is a failsafe against unusual filenames
path = Pathname.new(@path).realpath
Dir.mktmpdir do |unpack_dir|
cdr_path = Pathname.new(unpack_dir).join("#{path.basename(".dmg")}.cdr")
without_eula = @command.run("/usr/bin/hdiutil",
args: ["attach", "-plist", "-nobrowse", "-readonly", "-noidme", "-mountrandom", unpack_dir, path],
input: "qn\n",
print_stderr: false)
# If mounting without agreeing to EULA succeeded, there is none.
plist = if without_eula.success?
without_eula.plist
else
@command.run!("/usr/bin/hdiutil", args: ["convert", "-quiet", "-format", "UDTO", "-o", cdr_path, path])
with_eula = @command.run!("/usr/bin/hdiutil",
args: ["attach", "-plist", "-nobrowse", "-readonly", "-noidme", "-mountrandom", unpack_dir, cdr_path])
if verbose? && !(eula_text = without_eula.stdout).empty?
ohai "Software License Agreement for '#{path}':"
puts eula_text
end
with_eula.plist
end
yield mounts_from_plist(plist)
end
end
def eject(mount)
# realpath is a failsafe against unusual filenames
mountpath = Pathname.new(mount).realpath
return unless mountpath.exist?
begin
tries ||= 3
if tries > 1
@command.run("/usr/sbin/diskutil",
args: ["eject", mountpath],
print_stderr: false)
else
@command.run("/usr/sbin/diskutil",
args: ["unmount", "force", mountpath],
print_stderr: false)
end
raise CaskError, "Failed to eject #{mountpath}" if mountpath.exist?
rescue CaskError => e
raise e if (tries -= 1).zero?
sleep 1
retry
end
end
private
def extract_mount(mount)
Tempfile.open(["", ".bom"]) do |bomfile|
bomfile.close
Tempfile.open(["", ".list"]) do |filelist|
filelist.write(bom_filelist_from_path(mount))
filelist.close
@command.run!("/usr/bin/mkbom", args: ["-s", "-i", filelist.path, "--", bomfile.path])
@command.run!("/usr/bin/ditto", args: ["--bom", bomfile.path, "--", mount, @cask.staged_path])
end
end
end
def bom_filelist_from_path(mount)
Dir.chdir(mount) do
Dir.glob("**/*", File::FNM_DOTMATCH).map do |path|
next if skip_path?(Pathname(path))
(path == ".") ? path : path.prepend("./")
end.compact.join("\n").concat("\n")
end
end
def skip_path?(path)
dmg_metadata?(path) || system_dir_symlink?(path)
end
# unnecessary DMG metadata
DMG_METADATA_FILES = Set.new %w[
.background
.com.apple.timemachine.donotpresent
.com.apple.timemachine.supported
.DocumentRevisions-V100
.DS_Store
.fseventsd
.MobileBackups
.Spotlight-V100
.TemporaryItems
.Trashes
.VolumeIcon.icns
].freeze
def dmg_metadata?(path)
relative_root = path.sub(%r{/.*}, "")
DMG_METADATA_FILES.include?(relative_root.basename.to_s)
end
def system_dir_symlink?(path)
# symlinks to system directories (commonly to /Applications)
path.symlink? && MacOS.system_dir?(path.readlink)
end
def mounts_from_plist(plist)
return [] unless plist.respond_to?(:fetch)
plist.fetch("system-entities", []).map { |e| e["mount-point"] }.compact
end
end
end
end
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