Crash on MacOS when ~/Library/Application Support/Bitcoin is a link #2434

• My disk is partitioned
• boot partition has less than 6GB free space
• moved the bitcoin folder from ~/Library/Application Support/ to /Volumes/Data and replaced it with an "Alias" (Mac speak for symlink)
• Upon starting the client, it crashes.

=> instead of blindly trying to create the "Bitcoin" directory, look for symlinks

Process: Bitcoin-Qt [5889] Path: /Applications/Bitcoin-Qt.app/Contents/MacOS/Bitcoin-Qt Identifier: com.yourcompany.Bitcoin-Qt Version: ??? (???) Code Type: X86 (Native) Parent Process: launchd [379]

Date/Time: 2013-04-01 09:29:48.032 +0200 OS Version: Mac OS X 10.6.8 (10K549) Report Version: 6

Interval Since Last Report: 514711 sec Crashes Since Last Report: 1 Per-App Interval Since Last Report: 82447 sec Per-App Crashes Since Last Report: 1 Anonymous UUID: 612F2A06-2FFD-4D12-A8C9-5137DD3444B2

Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Application Specific Information: abort() called

Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libSystem.B.dylib 0x9a827c5a __kill + 10 1 libSystem.B.dylib 0x9a827c4c kill$UNIX2003 + 32 2 libSystem.B.dylib 0x9a8ba5a5 raise + 26 3 libSystem.B.dylib 0x9a8d06e4 abort + 93 4 libstdc++.6.dylib 0x99f9afda __gnu_cxx::__verbose_terminate_handler() + 433 5 libstdc++.6.dylib 0x99f9917a __cxxabiv1::__terminate(void ()()) + 10 6 libstdc++.6.dylib 0x99f991ba __cxxabiv1::__unexpected(void ()()) + 0 7 libstdc++.6.dylib 0x99f992b8 __gxx_exception_cleanup(Unwind_Reason_Code, _Unwind_Exception) + 0 8 libboost_filesystem-mt.dylib 0x00c29bc5 boost::filesystem::detail::create_directory(boost::filesystem::path const&, boost::system::error_code_) + 281 9 com.yourcompany.Bitcoin-Qt 0x0007e561 GetDataDir(bool) + 449 10 com.yourcompany.Bitcoin-Qt 0x00020dd1 main + 417 11 com.yourcompany.Bitcoin-Qt 0x0001f921 start + 53

Thread 1: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x9a7ed382 kevent + 10 1 libSystem.B.dylib 0x9a7eda9c _dispatch_mgr_invoke + 215 2 libSystem.B.dylib 0x9a7ecf59 _dispatch_queue_invoke + 163 3 libSystem.B.dylib 0x9a7eccfe _dispatch_worker_thread2 + 240 4 libSystem.B.dylib 0x9a7ec781 _pthread_wqthread + 390 5 libSystem.B.dylib 0x9a7ec5c6 start_wqthread + 30

Thread 2: 0 libSystem.B.dylib 0x9a7ec412 __workq_kernreturn + 10 1 libSystem.B.dylib 0x9a7ec9a8 _pthread_wqthread + 941 2 libSystem.B.dylib 0x9a7ec5c6 start_wqthread + 30

Thread 0 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x9a8d0693 ecx: 0xbffff3ac edx: 0x9a827c5a edi: 0xa0cb6b30 esi: 0x01ce031c ebp: 0xbffff3c8 esp: 0xbffff3ac ss: 0x0000001f efl: 0x00200282 eip: 0x9a827c5a cs: 0x00000007 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 cr2: 0x002b6000

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Model: MacBookPro4,1, BootROM MBP41.00C1.B03, 2 processors, Intel Core 2 Duo, 2.5 GHz, 6 GB, SMC 1.27f3 Graphics: NVIDIA GeForce 8600M GT, GeForce 8600M GT, PCIe, 512 MB Memory Module: global_name AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.42.4) Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports Network Service: Built-in Ethernet, Ethernet, en0 Network Service: AirPort, AirPort, en1 Serial ATA Device: WDC WD5000BEVT-22ZAT0, 465,76 GB Parallel ATA Device: HL-DT-ST DVDRW GSA-S10N USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0xfd400000 / 3 USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x1a100000 / 2 USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x820f, 0x1a110000 / 4 USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0231, 0x5d200000 / 3 USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x5d100000 / 2

I would recommend creating a BSD hardlink instead. Reading up on alias (an Apple "shortcut" file, not using any *nix construct), it looks potentially dangerous anyway, as it can search your hard drive when files are changed, and might just as easily pick another datadir:

"Since any of these properties can change without the computer's knowledge, as a result of user activity, various search algorithms are used to find the most plausible target. This fault-tolerance sets the alias apart from similar functions in some other operating systems, such as the Unix symbolic link or the Microsoft Windows shortcut, at the expense of increased complexity and unpredictability." (wikipedia)

Workaround: symbolic link the chainstate/ and blocks/ subfolders using the Terminal.

I don't know nuthin about how OSX aliases work under the covers, are they just symlinks?

@gavinandresen: they are more than symlinks, they are designed not to (easily) break if you move the target. @qubez You cannot - from the GUI - create hard or symlinks in MacOS. As a Mac user, you create Aliases. Symlinking worked for me, but how many Maccies will go to the terminal and symlink the new position of the Bitcoins folder?

https://en.wikipedia.org/wiki/Alias_%28Mac_OS%29 https://developer.apple.com/library/mac/#documentation/Carbon/Reference/Alias_Manager/Reference/reference.html

it would be fixable... but i'm not sure if it's worth. Mac aliases are files with a very specify steve-jobs-like format. It's readable with some mac foundation frameworks (code examples: https://github.com/rentzsch/bdalias). The BDAlias helper (see link above) gives some access point on how to handle the aliases. BDAlias could be used as based (MIT license).

One way would be:

• on mac...
• check with C++ if the data dir (on mac: ~/Library/Application Support/Bitcoin) is a file
• check with a Cocoa/Foundation bridge class (.mm file) if the class is a Mac Alias an get the real path as String
• reset the data dir variable

If someone thinks, this is worth coding,.. i'll do it. :) Remember: most mac apps (especially multiplatform apps) won't work with non-bsd-like symlinks (mac aliases).

IMO not worth it. We'd like to have less platform-specific code, not more, especially in the core code (GUI is excusable in some cases).

@laanwj agree. Close?

+1 to close