2b66a2f5c1
Depot macOS runners have no physical display, causing XCUITests to fail with "Failed to activate application (current state: Running Background)". This adds a small ObjC tool that creates a virtual display using the private CGVirtualDisplay API before tests run.
93 lines
3.4 KiB
Objective-C
93 lines
3.4 KiB
Objective-C
// Creates a virtual display on headless macOS (CI runners without a physical monitor).
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// Uses the private CGVirtualDisplay API from CoreGraphics.
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// The display stays alive as long as this process runs.
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//
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// Build: clang -framework Foundation -framework CoreGraphics -o create-virtual-display create-virtual-display.m
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// Usage: ./create-virtual-display &
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#import <Foundation/Foundation.h>
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#import <objc/runtime.h>
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// Private CoreGraphics classes (declared here since they're not in public headers)
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@interface CGVirtualDisplayMode : NSObject
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- (instancetype)initWithWidth:(unsigned int)width height:(unsigned int)height refreshRate:(double)refreshRate;
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@end
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@interface CGVirtualDisplayDescriptor : NSObject
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@property (nonatomic, copy) NSString *name;
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@property (nonatomic) unsigned int maxPixelsWide;
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@property (nonatomic) unsigned int maxPixelsHigh;
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@property (nonatomic) CGSize sizeInMillimeters;
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@property (nonatomic) unsigned int vendorID;
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@property (nonatomic) unsigned int productID;
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@property (nonatomic) unsigned int serialNum;
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@property (nonatomic, strong) dispatch_queue_t queue;
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@end
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@interface CGVirtualDisplaySettings : NSObject
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@property (nonatomic) unsigned int hiDPI;
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@property (nonatomic, strong) NSArray *modes;
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@end
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@interface CGVirtualDisplay : NSObject
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- (instancetype)initWithDescriptor:(CGVirtualDisplayDescriptor *)descriptor;
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- (BOOL)applySettings:(CGVirtualDisplaySettings *)settings;
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@property (nonatomic, readonly) unsigned int displayID;
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@end
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int main(int argc, const char *argv[]) {
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@autoreleasepool {
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unsigned int width = 1920;
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unsigned int height = 1080;
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// Verify the private classes exist
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if (!NSClassFromString(@"CGVirtualDisplay")) {
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fprintf(stderr, "ERROR: CGVirtualDisplay API not available on this system\n");
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return 1;
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}
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// Create display mode
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CGVirtualDisplayMode *mode = [[CGVirtualDisplayMode alloc] initWithWidth:width height:height refreshRate:60.0];
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if (!mode) {
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fprintf(stderr, "ERROR: Failed to create CGVirtualDisplayMode\n");
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return 1;
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}
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// Configure descriptor
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CGVirtualDisplayDescriptor *descriptor = [[CGVirtualDisplayDescriptor alloc] init];
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descriptor.name = @"CI Virtual Display";
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descriptor.maxPixelsWide = width;
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descriptor.maxPixelsHigh = height;
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descriptor.sizeInMillimeters = CGSizeMake(530, 300);
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descriptor.vendorID = 0x1234;
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descriptor.productID = 0x5678;
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descriptor.serialNum = 0x0001;
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descriptor.queue = dispatch_get_main_queue();
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// Create virtual display
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CGVirtualDisplay *display = [[CGVirtualDisplay alloc] initWithDescriptor:descriptor];
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if (!display) {
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fprintf(stderr, "ERROR: Failed to create CGVirtualDisplay\n");
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return 1;
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}
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// Apply settings with display mode
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CGVirtualDisplaySettings *settings = [[CGVirtualDisplaySettings alloc] init];
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settings.hiDPI = 0;
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settings.modes = @[mode];
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BOOL ok = [display applySettings:settings];
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if (!ok) {
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fprintf(stderr, "ERROR: Failed to apply display settings\n");
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return 1;
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}
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printf("Virtual display created: %ux%u@60Hz (displayID: %u)\n", width, height, display.displayID);
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printf("PID: %d\n", getpid());
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fflush(stdout);
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// Keep alive so the display persists
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dispatch_main();
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}
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return 0;
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}
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