SUDiskImageUnarchiver.m

//
//  SUDiskImageUnarchiver.m
//  Sparkle
//
//  Created by Andy Matuschak on 6/16/08.
//  Copyright 2008 Andy Matuschak. All rights reserved.
//

#import "SUDiskImageUnarchiver.h"
#import "SUUnarchiver_Private.h"
#import "NTSynchronousTask.h"

@implementation SUDiskImageUnarchiver

+ (BOOL)_canUnarchiveURL:(NSURL *)URL
{
	return [URL conformsToType:@"public.disk-image"];
}

- (void)start
{
	[NSThread detachNewThreadSelector:@selector(_extractDMG) toTarget:self withObject:nil];
}

- (void)_extractDMG
{		
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	NSString *archivePath = [archiveURL path];
	BOOL mountedSuccessfully = NO;
	
	// get a unique mount point path
	NSString *mountPrefix = [@"/Volumes" stringByAppendingPathComponent:[[archivePath lastPathComponent] stringByDeletingPathExtension]];
	NSString *mountPoint = [mountPrefix stringByAppendingString:[[NSProcessInfo processInfo] globallyUniqueString]];
	
	if ([[NSFileManager defaultManager] fileExistsAtPath:mountPoint]) goto reportError;

	// create mount point folder
	[[NSFileManager defaultManager] createDirectoryAtPath:mountPoint attributes:nil];
	if (![[NSFileManager defaultManager] fileExistsAtPath:mountPoint]) goto reportError;

	NSArray* arguments = [NSArray arrayWithObjects:@"attach", archivePath, @"-mountpoint", mountPoint, @"-noverify", @"-nobrowse", @"-noautoopen", nil];
	// set up a pipe and push "yes" (y works too), this will accept any license agreement crap
	// not every .dmg needs this, but this will make sure it works with everyone
	NSData* yesData = [[[NSData alloc] initWithBytes:"yes\n" length:4] autorelease];
	
	NSData *result = [NTSynchronousTask task:@"/usr/bin/hdiutil" directory:@"/" withArgs:arguments input:yesData];
	if (!result) goto reportError;
	mountedSuccessfully = YES;
	
	// Now that we've mounted it, we need to copy out its contents.
	NSString *targetPath = [[archivePath stringByDeletingLastPathComponent] stringByAppendingPathComponent:[mountPoint lastPathComponent]];
	if (![[NSFileManager defaultManager] createDirectoryAtPath:targetPath attributes:nil]) goto reportError;
	
	// We can't just copyPath: from the volume root because that always fails. Seems to be a bug.
	id subpathEnumerator = [[[NSFileManager defaultManager] directoryContentsAtPath:mountPoint] objectEnumerator], currentSubpath;
	while ((currentSubpath = [subpathEnumerator nextObject]))
	{
		if (![[NSFileManager defaultManager] copyPath:[mountPoint stringByAppendingPathComponent:currentSubpath] toPath:[targetPath stringByAppendingPathComponent:currentSubpath] handler:nil])
			goto reportError;
	}
			
	[self performSelectorOnMainThread:@selector(_notifyDelegateOfSuccess) withObject:nil waitUntilDone:NO];
	goto finally;
	
reportError:
	[self performSelectorOnMainThread:@selector(_notifyDelegateOfFailure) withObject:nil waitUntilDone:NO];

finally:
	if (mountedSuccessfully)
		[NSTask launchedTaskWithLaunchPath:@"/usr/bin/hdiutil" arguments:[NSArray arrayWithObjects:@"detach", mountPoint, @"-force", nil]];	
	[pool drain];
}

+ (void)load
{
	[self _registerImplementation:self];
}

@end