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GMUserFileSystem.m
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GMUserFileSystem.m
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// ================================================================
// Copyright (c) 2007, Google Inc.
// All rights reserved.
//
// 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 kGMUserFileSystemVolumeSupportsExtendedDatesKey = @"kGMUserFileSystemVolumeSupportsExtendedDatesKey";
// 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
// TODO: Create our own key so that a fileSystem can override this.
stbuf->f_namemax = 255;
// Block size
// TODO: Create our own key so that a fileSystem can override this.
stbuf->f_bsize = stbuf->f_frsize = 4096;
// 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;
}
#if __DARWIN_64_BIT_INO_T
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
// Size for regular files.
// TODO: Revisit size for directories.
if (![fileType isEqualToString:NSFileTypeDirectory]) {
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.
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) {
*userData = [GMDataBackedFileDelegate fileDelegateWithData:data];
return YES;
}
} else if ([delegate respondsToSelector:@selector(openFileAtPath:mode:userData:error:)]) {
if ([delegate openFileAtPath:path
mode:mode
userData:userData
error:error]) {