Lawrence Lomax lawrencelomax

instruments-without-delay uses the DYLD_INSERT_LIBRARIES environment variable to shim from the instruments command line all the way down to ScriptAgentShim which is the iOS Simulator service responsible for interfacing UIAutomation JavaScript with the native UIAutomation.framework. It uses a stack of shims, starting at the instruments executable, going through Simulator.app. It is an essential part of ios-driver as it removes a pesky 200ms delay that drastically slows down the process of executing end-to-end tests. This is a fixed cost that would occur on every command.

Other than a few things being moved around and renamed in Xcode 7, there is the new issue of the codesigning of the Simulator app that triggers amfid whenever an unsigned image is loaded. This essentially means that we can't use DYLD_INSERT_LIBRARIES on the Simulator Process with SimShim

It is however, possible to inject these environment variables at the launchdaemon level. There is a plist fo

	2019-06-13 15:14:51,407 [DEBUG] - hpack.hpack - Encoded header block to b"\x83\x86D\x94`\xd2F\xbd\xe3\xd3X\xea1\xea\xdc[;\x98\x85b\x81\xdbQ'A\x8b\xa0\xe4\x1d\x13\x9d\t\xb8\x10<\xf0\xbf@\x82I\x7f\x86M\x835\x05\xb1\x1f_\x90\x1du\xd0b\r&=LMed\xffu\xd8t\x9fz\xa9\x9a\xca\xc8\xb5~\x939\xeaZk+%\x06\x8d\x80.\xca\xe0\xb0\x8d)\xfdH;<\x1a\xaf\xb5\t_\xa4\xcez\x98ew\x17\x17\xfb\xfe\xff"
	2019-06-13 15:14:51,637 [DEBUG] - hpack.hpack - Decoding b"\x88@\x0ccontent-type\x10application/grpc@\x0bgrpc-status\x019@\x0cgrpc-message\x7f%Application Bundle Name: Shortcuts \| ID: is.workflow.my.app \| Install Type user \| Container (null) cannot be launched as it's not signed with a development identity"
	2019-06-13 15:14:51,637 [DEBUG] - hpack.hpack - Decoded 8, consumed 1 bytes
	2019-06-13 15:14:51,637 [DEBUG] - hpack.hpack - Decoded (b':status', b'200'), consumed 1
	2019-06-13 15:14:51,637 [DEBUG] - hpack.hpack - Decoded 12, consumed 1 bytes
	2019-06-13 15:14:51,637 [DEBUG] - hpack.hpack - Decoded 16, consumed 1 bytes
	2019-06-13 15:14:51

	2019-06-13 15:15:36,947 [DEBUG] - hpack.hpack - Adding (b'user-agent', b'grpc-python-grpclib/0.3.0rc4 (darwin; cpython/3.6.2+)') to the header table
	2019-06-13 15:15:36,947 [DEBUG] - hpack.hpack - Encoding 58 with 6 bits
	2019-06-13 15:15:36,947 [DEBUG] - hpack.hpack - Encoding 41 with 7 bits
	2019-06-13 15:15:36,947 [DEBUG] - hpack.hpack - Encoded header block to b"\x83\x86D\x94`\xd2F\xbd\xe3\xd3X\xea1\xea\xdc[;\x98\x85b\x81\xdbQ'A\x8b\xa0\xe4\x1d\x13\x9d\t\xb8\x10<\xf0\xbf@\x82I\x7f\x86M\x835\x05\xb1\x1f_\x90\x1du\xd0b\r&=LMed\xffu\xd8t\x9fz\xa9\x9a\xca\xc8\xb5~\x939\xeaZk+%\x06\x8d\x80.\xca\xe0\xb0\x8d)\xfdH;<\x1a\xaf\xb5\t_\xa4\xcez\x98ew\x17\x17\xfb\xfe\xff"
	2019-06-13 15:15:37,073 [DEBUG] - hpack.hpack - Decoding b"\x88@\x0ccontent-type\x10application/grpc@\x0bgrpc-status\x019@\x0cgrpc-message\x7f%Application Bundle Name: Shortcuts \| ID: is.workflow.my.app \| Install Type user \| Container (null) cannot be launched as it's not signed with a development identity"
	2019-06-13 15:15:37,073 [DEBUG] - hpack.hpack

	$ DYLD_FALLBACK_FRAMEWORK_PATH=/Applications/xcode_8_beta_4.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks \
	DYLD_FALLBACK_LIBRARY_PATH=/Applications/xcode_8_beta_4.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib \
	DYLD_ROOT_PATH=/Applications/xcode_8_beta_4.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk \
	DYLD_SHARED_REGION=avoid \
	DYLD_INSERT_LIBRARIES=/Users/lawrencelomax/Library/Developer/Xcode/DerivedData/otest-shim-gzqfivxxroyopfctymsslntqaxit/Build/Products/Debug/lib/otest-shim-ios.dylib \
	DYLD_PRINT_LIBRARIES=1 \
	/Applications/xcode_8_beta_4.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Agents/xctest \
	-XCTest All ~/src/FBSimulatorControl/XCTestBootstrapTests/Fixtures/SimpleTestTarget.xctest

	xcodebuild build build
	2016-07-25 11:06:23.977 xctool[76237:2732422] *** Assertion failure in __LaunchXcodebuildTaskAndFeedEventsToReporters_block_invoke(), /tmp/xctool-20160725-72874-vvod9r/Common/XCToolUtil.m:380
	2016-07-25 11:06:23.980 xctool[76237:2732422] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Got error while trying to deserialize event 'User defaults from command line:': The data is not in the correct
	format.'
	*** First throw call stack:
	(
	0 CoreFoundation 0x00007fff94abf4f2 __exceptionPreprocess + 178
	1 libobjc.A.dylib 0x00007fff90e51f7e objc_exception_throw + 48
	2 CoreFoundation 0x00007fff94ac41ca +[NSException raise:format:arguments:] + 106
	3 Foundation 0x00007fff92dca1ee -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 169

	[lawrencelomax:/usr/local] master+ ± brew install --debug fbsimctl
	/usr/local/Library/brew.rb (Formulary::FormulaLoader): loading /usr/local/Library/Taps/facebook/homebrew-fb/fbsimctl.rb
	==> Installing fbsimctl from facebook/fb
	/usr/local/Library/brew.rb (Formulary::FormulaLoader): loading /usr/local/Library/Taps/homebrew/homebrew-core/Formula/carthage.rb
	/usr/local/Library/Homebrew/build.rb (Formulary::FromPathLoader): loading /usr/local/Library/Taps/facebook/homebrew-fb/fbsimctl.rb
	/usr/local/Library/Homebrew/build.rb (Formulary::FormulaLoader): loading /usr/local/Library/Taps/homebrew/homebrew-core/Formula/carthage.rb
	==> Downloading file:///Users/lawrencelomax/Desktop/bad.zip
	######################################################################## 100.0%
	Warning: Cannot verify integrity of fbsimctl-0.0.1.zip
	A checksum was not provided for this resource

	HTTP/1.1 200 OK
	Content-Length: 1809
	Server: Swifter 1.1.2
	Content-Type: application/json

	{
	"status" : "success",
	"events" : [
	{
	"event_type" : "started",

	class Fbsimctl < Formula
	desc "A Powerful Command Line for Managing iOS Simulators"
	homepage "https://github.com/facebook/FBSimulatorControl/"
	url "https://github.com/facebook/FBSimulatorControl/archive/master.zip"
	sha256 ""
	version "0.0.1"

	depends_on "carthage"
	depends_on :xcode => "7.0"

	Oct 13 08:41:44 lawrencelom-mbp syncdefaultsd[10129]: (Note ) SYDAlwaysOnAccount: no account (null)
	Oct 13 08:41:44 lawrencelom-mbp CoreSimulatorBridge[9632]: Requesting launch of com.example.apple-samplecode.TableSearch with options: {
	arguments = (
	"-NSTreatUnknownArgumentsAsOpen",
	NO,
	"-ApplePersistenceIgnoreState",
	YES
	);
	environment = {
	AppTargetLocation = "/Users/lawrencelomax/Library/Developer/Xcode/DerivedData/TableSearch-avrosnidtpyztnerixabsyhzbfvt/Build/Products/Debug-iphoneos/TableSearch.app/TableSearch";

	2015-09-25 10:23:18.449 xctest[80351:2903136] Port: <AVCaptureInputPort: 0x10053ce60 (AVCaptureScreenInput: 0x10053ca50) vide 0000 enabled>
	2015-09-25 10:23:18.934 xctest[80351:2903717] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.000 xctest[80351:2903572] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.046 xctest[80351:2903572] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.113 xctest[80351:2903717] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.201 xctest[80351:2903717] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.246 xctest[80351:2903717] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.335 xctest[80351:2903572] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.380 xctest[80351:2903717] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample
	2015-09-25 10:23:19.469 xctest[80351:2903572] <AVCaptureVideoDataOutput: 0x10053bcb0> Did Sample