framework/GMUserFileSystem.m at master · fuse4x/framework · GitHub

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// ================================================================

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// * Neither the name of Google Inc. nor the names of its

// contributors may be used to endorse or promote products derived from

// this software without specific prior written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// ================================================================

// GMUserFileSystem.m

// Created by ted on 12/29/07.

// Based on FUSEFileSystem originally by alcor.

#import "GMUserFileSystem.h"

#define FUSE_USE_VERSION 26

#include <fuse.h>

#include <string.h>

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/param.h>

#include <sys/mount.h>

#include <sys/ioctl.h>

#include <sys/sysctl.h>

#include <sys/utsname.h>

#import <Foundation/Foundation.h>

#import "GMAppleDouble.h"

#import "GMFinderInfo.h"

#import "GMResourceFork.h"

#import "GMDataBackedFileDelegate.h"

#import "GMDTrace.h"

#define GM_EXPORT __attribute__((visibility("default")))

// Creates a dtrace-ready string with any newlines removed.

#define DTRACE_STRING(s) \

((char *)[[s stringByReplacingOccurrencesOfString:@"\n" withString:@" "] UTF8String])

// Notifications

GM_EXPORT NSString* const kGMUserFileSystemErrorDomain = @"GMUserFileSystemErrorDomain";

GM_EXPORT NSString* const kGMUserFileSystemMountPathKey = @"mountPath";

GM_EXPORT NSString* const kGMUserFileSystemErrorKey = @"error";

GM_EXPORT NSString* const kGMUserFileSystemMountFailed = @"kGMUserFileSystemMountFailed";

GM_EXPORT NSString* const kGMUserFileSystemDidMount = @"kGMUserFileSystemDidMount";

GM_EXPORT NSString* const kGMUserFileSystemDidUnmount = @"kGMUserFileSystemDidUnmount";

// Attribute keys

GM_EXPORT NSString* const kGMUserFileSystemFileFlagsKey = @"kGMUserFileSystemFileFlagsKey";

GM_EXPORT NSString* const kGMUserFileSystemFileAccessDateKey = @"kGMUserFileSystemFileAccessDateKey";

GM_EXPORT NSString* const kGMUserFileSystemFileChangeDateKey = @"kGMUserFileSystemFileChangeDateKey";

GM_EXPORT NSString* const kGMUserFileSystemFileBackupDateKey = @"kGMUserFileSystemFileBackupDateKey";

GM_EXPORT NSString* const kGMUserFileSystemFileSizeInBlocksKey = @"kGMUserFileSystemFileSizeInBlocksKey";

GM_EXPORT NSString* const kGMUserFileSystemVolumeSupportsExtendedDatesKey = @"kGMUserFileSystemVolumeSupportsExtendedDatesKey";

GM_EXPORT NSString* const kGMUserFileSystemVolumeMaxFilenameLengthKey = @"kGMUserFileSystemVolumeMaxFilenameLengthKey";

GM_EXPORT NSString* const kGMUserFileSystemVolumeFileSystemBlockSizeKey = @"kGMUserFileSystemVolumeFileSystemBlockSizeKey";

// TODO: Remove comment on EXPORT if/when setvolname is supported.

/* GM_EXPORT */ NSString* const kGMUserFileSystemVolumeSupportsSetVolumeNameKey = @"kGMUserFileSystemVolumeSupportsSetVolumeNameKey";

/* GM_EXPORT */ NSString* const kGMUserFileSystemVolumeNameKey = @"kGMUserFileSystemVolumeNameKey";

// FinderInfo and ResourceFork keys

GM_EXPORT NSString* const kGMUserFileSystemFinderFlagsKey = @"kGMUserFileSystemFinderFlagsKey";

GM_EXPORT NSString* const kGMUserFileSystemFinderExtendedFlagsKey = @"kGMUserFileSystemFinderExtendedFlagsKey";

GM_EXPORT NSString* const kGMUserFileSystemCustomIconDataKey = @"kGMUserFileSystemCustomIconDataKey";

GM_EXPORT NSString* const kGMUserFileSystemWeblocURLKey = @"kGMUserFileSystemWeblocURLKey";

// Used for time conversions to/from tv_nsec.

static const double kNanoSecondsPerSecond = 1000000000.0;

typedef enum {

// Unable to unmount a dead FUSE files system located at mount point.

GMUserFileSystem_ERROR_UNMOUNT_DEADFS = 1000,

// Gave up waiting for system removal of existing dir in /Volumes/x after

// unmounting a dead FUSE file system.

GMUserFileSystem_ERROR_UNMOUNT_DEADFS_RMDIR = 1001,

// The mount point did not exist, and we were unable to mkdir it.

GMUserFileSystem_ERROR_MOUNT_MKDIR = 1002,

// fuse_main returned while trying to mount and don't know why.

GMUserFileSystem_ERROR_MOUNT_FUSE_MAIN_INTERNAL = 1003,

} GMUserFileSystemErrorCode;

typedef enum {

GMUserFileSystem_NOT_MOUNTED, // Not mounted.

GMUserFileSystem_MOUNTING, // In the process of mounting.

GMUserFileSystem_INITIALIZING, // Almost done mounting.

GMUserFileSystem_MOUNTED, // Confirmed to be mounted.

GMUserFileSystem_UNMOUNTING, // In the process of unmounting.

GMUserFileSystem_FAILURE, // Failed state; probably a mount failure.

} GMUserFileSystemStatus;

@interface GMUserFileSystemInternal : NSObject {

NSString* mountPath_;

GMUserFileSystemStatus status_;

BOOL shouldCheckForResource_; // Try to handle FinderInfo/Resource Forks?

BOOL isThreadSafe_; // Is the delegate thread-safe?

BOOL supportsExtendedTimes_; // Delegate supports create and backup times?

BOOL supportsSetVolumeName_; // Delegate supports setvolname?

BOOL isReadOnly_; // Is this mounted read-only?

id delegate_;

}

- (id)initWithDelegate:(id)delegate isThreadSafe:(BOOL)isThreadSafe;

- (void)setDelegate:(id)delegate;

@end

@implementation GMUserFileSystemInternal

- (id)init {

return [self initWithDelegate:nil isThreadSafe:NO];

}

- (id)initWithDelegate:(id)delegate isThreadSafe:(BOOL)isThreadSafe {

if ((self = [super init])) {

status_ = GMUserFileSystem_NOT_MOUNTED;

isThreadSafe_ = isThreadSafe;

supportsExtendedTimes_ = NO;

supportsSetVolumeName_ = NO;

isReadOnly_ = NO;

[self setDelegate:delegate];

}

return self;

}

- (void)dealloc {

[mountPath_ release];

[super dealloc];

}

- (NSString *)mountPath { return mountPath_; }

- (void)setMountPath:(NSString *)mountPath {

[mountPath_ autorelease];

mountPath_ = [mountPath copy];

}

- (GMUserFileSystemStatus)status { return status_; }

- (void)setStatus:(GMUserFileSystemStatus)status { status_ = status; }

- (BOOL)isThreadSafe { return isThreadSafe_; }

- (BOOL)supportsExtendedTimes { return supportsExtendedTimes_; }

- (void)setSupportsExtendedTimes:(BOOL)val { supportsExtendedTimes_ = val; }

- (BOOL)supportsSetVolumeName { return supportsSetVolumeName_; }

- (void)setSupportsSetVolumeName:(BOOL)val { supportsSetVolumeName_ = val; }

- (BOOL)shouldCheckForResource { return shouldCheckForResource_; }

- (BOOL)isReadOnly { return isReadOnly_; }

- (void)setIsReadOnly:(BOOL)val { isReadOnly_ = val; }

- (id)delegate { return delegate_; }

- (void)setDelegate:(id)delegate {

delegate_ = delegate;

shouldCheckForResource_ =

[delegate_ respondsToSelector:@selector(finderAttributesAtPath:error:)] ||

[delegate_ respondsToSelector:@selector(resourceAttributesAtPath:error:)] ||

[delegate_ respondsToSelector:@selector(finderFlagsAtPath:)] ||

[delegate_ respondsToSelector:@selector(iconDataAtPath:)] ||

[delegate_ respondsToSelector:@selector(URLOfWeblocAtPath:)];

// Check for deprecated methods.

SEL deprecatedMethods[] = {

@selector(valueOfExtendedAttribute:ofItemAtPath:error:),

@selector(setExtendedAttribute:ofItemAtPath:value:flags:error:),

@selector(finderFlagsAtPath:),

@selector(iconDataAtPath:),

@selector(URLOfWeblocAtPath:),

@selector(truncateFileAtPath:offset:error:),

@selector(attributesOfItemAtPath:error:),

@selector(setAttributes:ofItemAtPath:error:),

@selector(openFileAtPath:mode:fileDelegate:error:),

@selector(createFileAtPath:attributes:fileDelegate:error:),

@selector(releaseFileAtPath:fileDelegate:),

@selector(readFileAtPath:fileDelegate:buffer:size:offset:error:),

@selector(writeFileAtPath:fileDelegate:buffer:size:offset:error:),

};

int i;

for (i = 0; i < sizeof(deprecatedMethods)/sizeof(deprecatedMethods[0]); ++i) {

SEL sel = deprecatedMethods[i];

if ([delegate_ respondsToSelector:sel]) {

NSLog(@"*** WARNING: GMUserFileSystem delegate implements deprecated "

@"selector: %@", NSStringFromSelector(sel));

}

@end

// Deprecated delegate methods that we still support for backward compatibility

// with previously compiled file systems. This will be actively trimmed as

// new releases occur.

@interface NSObject (GMUserFileSystemDeprecated)

- (NSData *)valueOfExtendedAttribute:(NSString *)name

ofItemAtPath:(NSString *)path

error:(NSError **)error;

- (BOOL)setExtendedAttribute:(NSString *)name

ofItemAtPath:(NSString *)path

value:(NSData *)value

flags:(int)flags

error:(NSError **)error;

- (UInt16)finderFlagsAtPath:(NSString *)path;

- (NSData *)iconDataAtPath:(NSString *)path;

- (NSURL *)URLOfWeblocAtPath:(NSString *)path;

- (BOOL)truncateFileAtPath:(NSString *)path

offset:(off_t)offset

error:(NSError **)error;

- (NSDictionary *)attributesOfItemAtPath:(NSString *)path

error:(NSError **)error;

- (BOOL)setAttributes:(NSDictionary *)attributes

ofItemAtPath:(NSString *)path

error:(NSError **)error;

- (BOOL)openFileAtPath:(NSString *)path

mode:(int)mode

fileDelegate:(id *)fileDelegate

error:(NSError **)error;

- (BOOL)createFileAtPath:(NSString *)path

attributes:(NSDictionary *)attributes

fileDelegate:(id *)fileDelegate

error:(NSError **)error;

- (void)releaseFileAtPath:(NSString *)path fileDelegate:(id)fileDelegate;

- (int)readFileAtPath:(NSString *)path

fileDelegate:(id)fileDelegate

buffer:(char *)buffer

size:(size_t)size

offset:(off_t)offset

error:(NSError **)error;

- (int)writeFileAtPath:(NSString *)path

fileDelegate:(id)fileDelegate

buffer:(const char *)buffer

size:(size_t)size

offset:(off_t)offset

error:(NSError **)error;

@end

@interface GMUserFileSystem (GMUserFileSystemPrivate)

// The filesystem for the current thread. Valid only during a fuse callback.

+ (GMUserFileSystem *)currentFS;

// Convenience method to creates an autoreleased NSError in the

// NSPOSIXErrorDomain. Filesystem errors returned by the delegate must be

// standard posix errno values.

+ (NSError *)errorWithCode:(int)code;

- (void)mount:(NSDictionary *)args;

- (NSDictionary *)finderAttributesAtPath:(NSString *)path;

- (NSDictionary *)resourceAttributesAtPath:(NSString *)path;

- (BOOL)hasCustomIconAtPath:(NSString *)path;

- (BOOL)isDirectoryIconAtPath:(NSString *)path dirPath:(NSString **)dirPath;

- (BOOL)isAppleDoubleAtPath:(NSString *)path realPath:(NSString **)realPath;

- (NSData *)finderDataForAttributes:(NSDictionary *)attributes;

- (NSData *)resourceDataForAttributes:(NSDictionary *)attributes;

- (NSData *)appleDoubleContentsAtPath:(NSString *)path;

- (NSDictionary *)defaultAttributesOfItemAtPath:(NSString *)path

userData:userData

error:(NSError **)error;

- (BOOL)fillStatBuffer:(struct stat *)stbuf

forPath:(NSString *)path

fileDelegate:(id)fileDelegate

error:(NSError **)error;

- (BOOL)fillStatvfsBuffer:(struct statvfs *)stbuf

forPath:(NSString *)path

error:(NSError **)error;

- (void)fuseInit;

- (void)fuseDestroy;

@end

@implementation GMUserFileSystem

- (id)init {

return [self initWithDelegate:nil isThreadSafe:NO];

}

- (id)initWithDelegate:(id)delegate isThreadSafe:(BOOL)isThreadSafe {

if ((self = [super init])) {

internal_ = [[GMUserFileSystemInternal alloc] initWithDelegate:delegate

isThreadSafe:isThreadSafe];

}

return self;

}

- (void)dealloc {

[internal_ release];

[super dealloc];

}

- (void)setDelegate:(id)delegate {

[internal_ setDelegate:delegate];

}

- (id)delegate {

return [internal_ delegate];

}

- (BOOL)enableExtendedTimes {

return [internal_ supportsExtendedTimes];

}

- (BOOL)enableSetVolumeName {

return [internal_ supportsSetVolumeName];

}

- (void)mountAtPath:(NSString *)mountPath

withOptions:(NSArray *)options {

[self mountAtPath:mountPath

withOptions:options

shouldForeground:YES

detachNewThread:YES];

}

- (void)mountAtPath:(NSString *)mountPath

withOptions:(NSArray *)options

shouldForeground:(BOOL)shouldForeground

detachNewThread:(BOOL)detachNewThread {

[internal_ setMountPath:mountPath];

NSMutableArray* optionsCopy = [NSMutableArray array];

for (int i = 0; i < [options count]; ++i) {

NSString* option = [options objectAtIndex:i];

if ([option caseInsensitiveCompare:@"rdonly"] == NSOrderedSame ||

[option caseInsensitiveCompare:@"ro"] == NSOrderedSame) {

[internal_ setIsReadOnly:YES];

}

[optionsCopy addObject:[[option copy] autorelease]];

}

NSDictionary* args =

[[NSDictionary alloc] initWithObjectsAndKeys:

optionsCopy, @"options",

[NSNumber numberWithBool:shouldForeground], @"shouldForeground",

nil, nil];

if (detachNewThread) {

[NSThread detachNewThreadSelector:@selector(mount:)

toTarget:self

withObject:args];

} else {

[self mount:args];

}

- (void)unmount {

if ([internal_ status] == GMUserFileSystem_MOUNTED) {

NSArray* args = [NSArray arrayWithObjects:@"-v", [internal_ mountPath], nil];

NSTask* unmountTask = [NSTask launchedTaskWithLaunchPath:@"/sbin/umount"

arguments:args];

[unmountTask waitUntilExit];

}

+ (NSError *)errorWithCode:(int)code {

return [NSError errorWithDomain:NSPOSIXErrorDomain code:code userInfo:nil];

}

+ (GMUserFileSystem *)currentFS {

struct fuse_context* context = fuse_get_context();

assert(context);

return (GMUserFileSystem *)context->private_data;

}

- (void)notifyMounted {

NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

// Successfully mounted, so post notification.

NSDictionary* userInfo =

[NSDictionary dictionaryWithObjectsAndKeys:

[internal_ mountPath], kGMUserFileSystemMountPathKey, nil, nil];

NSNotificationCenter* center = [NSNotificationCenter defaultCenter];

[center postNotificationName:kGMUserFileSystemDidMount object:self

userInfo:userInfo];

[pool release];

}

- (void)fuseInit {

[internal_ setStatus:GMUserFileSystem_INITIALIZING];

NSError* error = nil;

NSDictionary* attribs = [self attributesOfFileSystemForPath:@"/" error:&error];

if (attribs) {

NSNumber* supports;

supports = [attribs objectForKey:kGMUserFileSystemVolumeSupportsExtendedDatesKey];

if (supports && [supports boolValue]) {

[internal_ setSupportsExtendedTimes:YES];

}

supports = [attribs objectForKey:kGMUserFileSystemVolumeSupportsSetVolumeNameKey];

if (supports && [supports boolValue]) {

[internal_ setSupportsSetVolumeName:YES];

}

[internal_ setStatus:GMUserFileSystem_MOUNTED];

[NSThread detachNewThreadSelector:@selector(notifyMounted)

toTarget:self

withObject:nil];

}

- (void)fuseDestroy {

if ([[internal_ delegate] respondsToSelector:@selector(willUnmount)]) {

[[internal_ delegate] willUnmount];

}

[internal_ setStatus:GMUserFileSystem_UNMOUNTING];

NSDictionary* userInfo =

[NSDictionary dictionaryWithObjectsAndKeys:

[internal_ mountPath], kGMUserFileSystemMountPathKey,

nil, nil];

NSNotificationCenter* center = [NSNotificationCenter defaultCenter];

[center postNotificationName:kGMUserFileSystemDidUnmount object:self

userInfo:userInfo];

[internal_ setStatus:GMUserFileSystem_NOT_MOUNTED];

}

#pragma mark Finder Info, Resource Forks and HFS headers

- (NSDictionary *)finderAttributesAtPath:(NSString *)path {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(path));

}

UInt16 flags = 0;

// If a directory icon, we'll make invisible and update the path to parent.

if ([self isDirectoryIconAtPath:path dirPath:&path]) {

flags |= kIsInvisible;

}

id delegate = [internal_ delegate];

if ([delegate respondsToSelector:@selector(finderAttributesAtPath:error:)]) {

NSError* error = nil;

NSDictionary* dict = [delegate finderAttributesAtPath:path error:&error];

if (dict != nil) {

if ([dict objectForKey:kGMUserFileSystemCustomIconDataKey]) {

// They have custom icon data, so make sure the FinderFlags bit is set.

flags |= kHasCustomIcon;

}

if (flags != 0) {

// May need to update kGMUserFileSystemFinderFlagsKey if different.

NSNumber* finderFlags = [dict objectForKey:kGMUserFileSystemFinderFlagsKey];

if (finderFlags != nil) {

UInt16 tmp = (UInt16)[finderFlags longValue];

if (flags == tmp) {

return dict; // They already have our desired flags.

}

flags |= tmp;

}

// Doh! We need to create a new dict with the updated flags key.

NSMutableDictionary* newDict =

[NSMutableDictionary dictionaryWithDictionary:dict];

[newDict setObject:[NSNumber numberWithLong:flags]

forKey:kGMUserFileSystemFinderFlagsKey];

return newDict;

}

return dict;

}

// Fall through and create dictionary based on flags if necessary.

} else if ([delegate respondsToSelector:@selector(finderFlagsAtPath:)]) {

flags |= [delegate finderFlagsAtPath:path];

} else if ([delegate respondsToSelector:@selector(iconDataAtPath:)] &&

[delegate iconDataAtPath:path] != nil) {

flags |= kHasCustomIcon;

}

if (flags != 0) {

return [NSDictionary dictionaryWithObject:[NSNumber numberWithLong:flags]

forKey:kGMUserFileSystemFinderFlagsKey];

}

return nil;

}

- (NSDictionary *)resourceAttributesAtPath:(NSString *)path {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(path));

}

id delegate = [internal_ delegate];

if ([delegate respondsToSelector:@selector(resourceAttributesAtPath:error:)]) {

NSError* error = nil;

return [delegate resourceAttributesAtPath:path error:&error];

}

// Support for deprecated selectors.

NSURL* url = nil;

if ([path hasSuffix:@".webloc"] &&

[delegate respondsToSelector:@selector(URLOfWeblocAtPath:)]) {

url = [delegate URLOfWeblocAtPath:path];

}

NSData* imageData = nil;

if ([delegate respondsToSelector:@selector(iconDataAtPath:)]) {

imageData = [delegate iconDataAtPath:path];

}

if (imageData || url) {

NSMutableDictionary* dict = [NSMutableDictionary dictionary];

if (imageData) {

[dict setObject:imageData forKey:kGMUserFileSystemCustomIconDataKey];

}

if (url) {

[dict setObject:url forKey:kGMUserFileSystemWeblocURLKey];

}

return dict;

}

return nil;

}

- (BOOL)hasCustomIconAtPath:(NSString *)path {

if ([path isEqualToString:@"/"]) {

return NO; // For a volume icon they should use the volicon= option.

}

NSDictionary* finderAttribs = [self finderAttributesAtPath:path];

if (finderAttribs) {

NSNumber* finderFlags =

[finderAttribs objectForKey:kGMUserFileSystemFinderFlagsKey];

if (finderFlags) {

UInt16 flags = (UInt16)[finderFlags longValue];

return (flags & kHasCustomIcon) == kHasCustomIcon;

}

return NO;

}

- (BOOL)isDirectoryIconAtPath:(NSString *)path dirPath:(NSString **)dirPath {

NSString* name = [path lastPathComponent];

if ([name isEqualToString:@"Icon\r"]) {

if (dirPath) {

*dirPath = [path stringByDeletingLastPathComponent];

}

return YES;

}

return NO;

}

- (BOOL)isAppleDoubleAtPath:(NSString *)path realPath:(NSString **)realPath {

NSString* name = [path lastPathComponent];

if ([name hasPrefix:@"._"]) {

if (realPath) {

name = [name substringFromIndex:2];

*realPath = [path stringByDeletingLastPathComponent];

*realPath = [*realPath stringByAppendingPathComponent:name];

}

return YES;

}

return NO;

}

// If the given attribs dictionary contains any FinderInfo attributes then

// returns NSData for FinderInfo; otherwise returns nil.

- (NSData *)finderDataForAttributes:(NSDictionary *)attribs {

if (!attribs) {

return nil;

}

GMFinderInfo* info = [GMFinderInfo finderInfo];

BOOL attributeFound = NO; // Have we found at least one relevant attribute?

NSNumber* flags = [attribs objectForKey:kGMUserFileSystemFinderFlagsKey];

if (flags) {

attributeFound = YES;

[info setFlags:(UInt16)[flags longValue]];

}

NSNumber* extendedFlags =

[attribs objectForKey:kGMUserFileSystemFinderExtendedFlagsKey];

if (extendedFlags) {

attributeFound = YES;

[info setExtendedFlags:(UInt16)[extendedFlags longValue]];

}

NSNumber* typeCode = [attribs objectForKey:NSFileHFSTypeCode];

if (typeCode) {

attributeFound = YES;

[info setTypeCode:(OSType)[typeCode longValue]];

}

NSNumber* creatorCode = [attribs objectForKey:NSFileHFSCreatorCode];

if (creatorCode) {

attributeFound = YES;

[info setCreatorCode:(OSType)[creatorCode longValue]];

}

return attributeFound ? [info data] : nil;

}

// If the given attribs dictionary contains any ResourceFork attributes then

// returns NSData for the ResourceFork; otherwise returns nil.

- (NSData *)resourceDataForAttributes:(NSDictionary *)attribs {

if (!attribs) {

return nil;

}

GMResourceFork* fork = [GMResourceFork resourceFork];

BOOL attributeFound = NO; // Have we found at least one relevant attribute?

NSData* imageData = [attribs objectForKey:kGMUserFileSystemCustomIconDataKey];

if (imageData) {

attributeFound = YES;

[fork addResourceWithType:'icns'

resID:kCustomIconResource // -16455

name:nil

data:imageData];

}

NSURL* url = [attribs objectForKey:kGMUserFileSystemWeblocURLKey];

if (url) {

attributeFound = YES;

NSString* urlString = [url absoluteString];

NSData* data = [urlString dataUsingEncoding:NSUTF8StringEncoding];

[fork addResourceWithType:'url '

resID:256

name:nil

data:data];

}

return attributeFound ? [fork data] : nil;

}

// Returns the AppleDouble file contents, if any, for the given path. You should

// call this with the realPath out-param from a call to isAppleDoubleAtPath:.

// On 10.5 and (hopefully) above, the Finder will end up using the extended

// attributes and so we won't need to serve ._ files.

- (NSData *)appleDoubleContentsAtPath:(NSString *)path {

NSDictionary* finderAttributes = [self finderAttributesAtPath:path];

NSData* finderData = [self finderDataForAttributes:finderAttributes];

// We treat the ._ for a directory and it's ._Icon\r file the same. This means

// that we'll put extra resource-fork information in directory's ._ file even

// though it isn't needed. It's worth it given that it only affects 10.4.

[self isDirectoryIconAtPath:path dirPath:&path];

NSDictionary* resourceAttributes = [self resourceAttributesAtPath:path];

NSData* resourceData = [self resourceDataForAttributes:resourceAttributes];

if (finderData != nil || resourceData != nil) {

GMAppleDouble* doubleFile = [GMAppleDouble appleDouble];

if (finderData) {

[doubleFile addEntryWithID:DoubleEntryFinderInfo data:finderData];

}

if (resourceData) {

[doubleFile addEntryWithID:DoubleEntryResourceFork

data:resourceData];

}

return [doubleFile data];

}

return nil;

}

#pragma mark Internal Stat Operations

- (BOOL)fillStatvfsBuffer:(struct statvfs *)stbuf

forPath:(NSString *)path

error:(NSError **)error {

NSDictionary* attributes = [self attributesOfFileSystemForPath:path error:error];

if (!attributes) {

return NO;

}

// Maximum length of filenames

NSNumber* namemax = [attributes objectForKey:kGMUserFileSystemVolumeMaxFilenameLengthKey];

assert(namemax);

stbuf->f_namemax = [namemax unsignedLongValue];

// Block size

NSNumber* blocksize = [attributes objectForKey:kGMUserFileSystemVolumeFileSystemBlockSizeKey];

assert(blocksize);

stbuf->f_bsize = stbuf->f_frsize = [blocksize unsignedLongValue];

// Size in blocks

NSNumber* size = [attributes objectForKey:NSFileSystemSize];

assert(size);

stbuf->f_blocks = (fsblkcnt_t)([size longLongValue] / stbuf->f_frsize);

// Number of free / available blocks

NSNumber* freeSize = [attributes objectForKey:NSFileSystemFreeSize];

assert(freeSize);

stbuf->f_bfree = stbuf->f_bavail =

(fsblkcnt_t)([freeSize longLongValue] / stbuf->f_frsize);

// Number of nodes

NSNumber* numNodes = [attributes objectForKey:NSFileSystemNodes];

assert(numNodes);

stbuf->f_files = (fsfilcnt_t)[numNodes longLongValue];

// Number of free / available nodes

NSNumber* freeNodes = [attributes objectForKey:NSFileSystemFreeNodes];

assert(freeNodes);

stbuf->f_ffree = stbuf->f_favail = (fsfilcnt_t)[freeNodes longLongValue];

return YES;

}

- (BOOL)fillStatBuffer:(struct stat *)stbuf

forPath:(NSString *)path

userData:(id)userData

error:(NSError **)error {

NSDictionary* attributes = [self defaultAttributesOfItemAtPath:path

userData:userData

error:error];

if (!attributes) {

return NO;

}

// Inode

NSNumber* inode = [attributes objectForKey:NSFileSystemFileNumber];

if (inode) {

stbuf->st_ino = [inode longLongValue];

}

// Permissions (mode)

NSNumber* perm = [attributes objectForKey:NSFilePosixPermissions];

stbuf->st_mode = [perm longValue];

NSString* fileType = [attributes objectForKey:NSFileType];

if ([fileType isEqualToString:NSFileTypeDirectory ]) {

stbuf->st_mode |= S_IFDIR;

} else if ([fileType isEqualToString:NSFileTypeRegular]) {

stbuf->st_mode |= S_IFREG;

} else if ([fileType isEqualToString:NSFileTypeSymbolicLink]) {

stbuf->st_mode |= S_IFLNK;

} else {

*error = [GMUserFileSystem errorWithCode:EFTYPE];

return NO;

}

// Owner and Group

// Note that if the owner or group IDs are not specified, the effective

// user and group IDs for the current process are used as defaults.

NSNumber* uid = [attributes objectForKey:NSFileOwnerAccountID];

NSNumber* gid = [attributes objectForKey:NSFileGroupOwnerAccountID];

stbuf->st_uid = uid ? [uid longValue] : geteuid();

stbuf->st_gid = gid ? [gid longValue] : getegid();

// nlink

NSNumber* nlink = [attributes objectForKey:NSFileReferenceCount];

stbuf->st_nlink = [nlink longValue];

// flags

NSNumber* flags = [attributes objectForKey:kGMUserFileSystemFileFlagsKey];

if (flags) {

stbuf->st_flags = [flags longValue];

} else {

// Just in case they tried to use NSFileImmutable or NSFileAppendOnly

NSNumber* immutableFlag = [attributes objectForKey:NSFileImmutable];

if (immutableFlag && [immutableFlag boolValue]) {

stbuf->st_flags |= UF_IMMUTABLE;

}

NSNumber* appendFlag = [attributes objectForKey:NSFileAppendOnly];

if (appendFlag && [appendFlag boolValue]) {

stbuf->st_flags |= UF_APPEND;

}

// NOTE: We default atime,ctime to mtime if it is provided.

NSDate* mdate = [attributes objectForKey:NSFileModificationDate];

if (mdate) {

const double seconds_dp = [mdate timeIntervalSince1970];

const time_t t_sec = (time_t) seconds_dp;

const double nanoseconds_dp = ((seconds_dp - t_sec) * kNanoSecondsPerSecond);

const long t_nsec = (nanoseconds_dp > 0 ) ? nanoseconds_dp : 0;

stbuf->st_mtimespec.tv_sec = t_sec;

stbuf->st_mtimespec.tv_nsec = t_nsec;

stbuf->st_atimespec = stbuf->st_mtimespec; // Default to mtime

stbuf->st_ctimespec = stbuf->st_mtimespec; // Default to mtime

}

NSDate* adate = [attributes objectForKey:kGMUserFileSystemFileAccessDateKey];

if (adate) {

const double seconds_dp = [adate timeIntervalSince1970];

const time_t t_sec = (time_t) seconds_dp;

const double nanoseconds_dp = ((seconds_dp - t_sec) * kNanoSecondsPerSecond);

const long t_nsec = (nanoseconds_dp > 0 ) ? nanoseconds_dp : 0;

stbuf->st_atimespec.tv_sec = t_sec;

stbuf->st_atimespec.tv_nsec = t_nsec;

}

NSDate* cdate = [attributes objectForKey:kGMUserFileSystemFileChangeDateKey];

if (cdate) {

const double seconds_dp = [cdate timeIntervalSince1970];

const time_t t_sec = (time_t) seconds_dp;

const double nanoseconds_dp = ((seconds_dp - t_sec) * kNanoSecondsPerSecond);

const long t_nsec = (nanoseconds_dp > 0 ) ? nanoseconds_dp : 0;

stbuf->st_ctimespec.tv_sec = t_sec;

stbuf->st_ctimespec.tv_nsec = t_nsec;

}

#ifdef _DARWIN_FEATURE_64_BIT_INODE

NSDate* bdate = [attributes objectForKey:NSFileCreationDate];

if (bdate) {

const double seconds_dp = [bdate timeIntervalSince1970];

const time_t t_sec = (time_t) seconds_dp;

const double nanoseconds_dp = ((seconds_dp - t_sec) * kNanoSecondsPerSecond);

const long t_nsec = (nanoseconds_dp > 0 ) ? nanoseconds_dp : 0;

stbuf->st_birthtimespec.tv_sec = t_sec;

stbuf->st_birthtimespec.tv_nsec = t_nsec;

}

#endif

// File size

// Note that the actual file size of a directory depends on the internal

// representation of directories in the particular file system. In general

// this is not the combined size of the files in that directory.

NSNumber* size = [attributes objectForKey:NSFileSize];

if (size) {

stbuf->st_size = [size longLongValue];

}

// Set the number of blocks used so that Finder will display size on disk

// properly. The man page says that this is in terms of 512 byte blocks.

NSNumber* blocks = [attributes objectForKey:kGMUserFileSystemFileSizeInBlocksKey];

if (blocks) {

stbuf->st_blocks = [blocks longLongValue];

} else if (stbuf->st_size > 0) {

stbuf->st_blocks = stbuf->st_size / 512;

if (stbuf->st_size % 512) {

++(stbuf->st_blocks);

}

return YES;

}

#pragma mark Moving an Item

- (BOOL)moveItemAtPath:(NSString *)source

toPath:(NSString *)destination

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

NSString* traceinfo =

[NSString stringWithFormat:@"%@ -> %@", source, destination];

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(traceinfo));

}

if ([[internal_ delegate] respondsToSelector:@selector(moveItemAtPath:toPath:error:)]) {

return [[internal_ delegate] moveItemAtPath:source toPath:destination error:error];

}

*error = [GMUserFileSystem errorWithCode:EACCES];

return NO;

}

#pragma mark Removing an Item

- (BOOL)removeDirectoryAtPath:(NSString *)path error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(path));

}

if ([[internal_ delegate] respondsToSelector:@selector(removeDirectoryAtPath:error:)]) {

return [[internal_ delegate] removeDirectoryAtPath:path error:error];

}

return [self removeItemAtPath:path error:error];

}

- (BOOL)removeItemAtPath:(NSString *)path error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(path));

}

if ([[internal_ delegate] respondsToSelector:@selector(removeItemAtPath:error:)]) {

return [[internal_ delegate] removeItemAtPath:path error:error];

}

*error = [GMUserFileSystem errorWithCode:EACCES];

return NO;

}

#pragma mark Creating an Item

- (BOOL)createDirectoryAtPath:(NSString *)path

attributes:(NSDictionary *)attributes

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

NSMutableString* traceinfo =

[NSMutableString stringWithFormat:@"%@ [%@]", path, attributes];

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(traceinfo));

}

if ([[internal_ delegate] respondsToSelector:@selector(createDirectoryAtPath:attributes:error:)]) {

return [[internal_ delegate] createDirectoryAtPath:path attributes:attributes error:error];

}

*error = [GMUserFileSystem errorWithCode:EACCES];

return NO;

}

- (BOOL)createFileAtPath:(NSString *)path

attributes:(NSDictionary *)attributes

userData:(id *)userData

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

NSString* traceinfo = [NSString stringWithFormat:@"%@ [%@]", path, attributes];

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(traceinfo));

}

if ([[internal_ delegate] respondsToSelector:@selector(createFileAtPath:attributes:userData:error:)]) {

return [[internal_ delegate] createFileAtPath:path attributes:attributes

userData:userData error:error];

} else if ([[internal_ delegate] respondsToSelector:@selector(createFileAtPath:attributes:fileDelegate:error:)]) {

// NOTE: For backward compatibility with version 1.7 and prior.

return [[internal_ delegate] createFileAtPath:path attributes:attributes

fileDelegate:userData error:error];

}

*error = [GMUserFileSystem errorWithCode:EACCES];

return NO;

}

#pragma mark Linking an Item

- (BOOL)linkItemAtPath:(NSString *)path

toPath:(NSString *)otherPath

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

NSString* traceinfo = [NSString stringWithFormat:@"%@ -> %@", path, otherPath];

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(traceinfo));

}

if ([[internal_ delegate] respondsToSelector:@selector(linkItemAtPath:toPath:error:)]) {

return [[internal_ delegate] linkItemAtPath:path toPath:otherPath error:error];

}

*error = [GMUserFileSystem errorWithCode:ENOTSUP]; // Note: error not in man page.

return NO;

}

#pragma mark Symbolic Links

- (BOOL)createSymbolicLinkAtPath:(NSString *)path

withDestinationPath:(NSString *)otherPath

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

NSString* traceinfo = [NSString stringWithFormat:@"%@ -> %@", path, otherPath];

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(traceinfo));

}

if ([[internal_ delegate] respondsToSelector:@selector(createSymbolicLinkAtPath:withDestinationPath:error:)]) {

return [[internal_ delegate] createSymbolicLinkAtPath:path

withDestinationPath:otherPath

error:error];

}

*error = [GMUserFileSystem errorWithCode:ENOTSUP]; // Note: error not in man page.

return NO;

}

- (NSString *)destinationOfSymbolicLinkAtPath:(NSString *)path

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(path));

}

if ([[internal_ delegate] respondsToSelector:@selector(destinationOfSymbolicLinkAtPath:error:)]) {

return [[internal_ delegate] destinationOfSymbolicLinkAtPath:path error:error];

}

*error = [GMUserFileSystem errorWithCode:ENOENT];

return nil;

}

#pragma mark File Contents

// NOTE: Only call this if the delegate does indeed support this method.

- (NSData *)contentsAtPath:(NSString *)path {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(path));

}

id delegate = [internal_ delegate];

return [delegate contentsAtPath:path];

}

- (BOOL)openFileAtPath:(NSString *)path

mode:(int)mode

userData:(id *)userData

error:(NSError **)error {

if (FUSE4X_OBJC_DELEGATE_ENTRY_ENABLED()) {

NSString* traceinfo = [NSString stringWithFormat:@"%@, mode=0x%x", path, mode];

FUSE4X_OBJC_DELEGATE_ENTRY(DTRACE_STRING(traceinfo));

}

id delegate = [internal_ delegate];

if ([delegate respondsToSelector:@selector(contentsAtPath:)]) {

NSData* data = [self contentsAtPath:path];

if (data != nil) {

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