Debugging osascript execution from within a ruby daemon-Collection of common programming errors
I have a need to frequently run an applescript on my web server. As the server is running rails, and I need access to my models before and after running the script, I thought that a daemon (via the daemons gem) might be appropriate.
In theory this is fairly easy. Below is a simplified example.
#!/usr/bin/env ruby
ENV["RAILS_ENV"] ||= "development"
require File.dirname(__FILE__) + "/../../config/application"
Rails.application.require_environment!
$running = true
Signal.trap("TERM") do
$running = false
end
while($running) do
Rails.logger.info "Daemon running at #{Time.now}.\n"
# sanity check
%x{touch /foo.txt}
# this stops working after a while
result = %x{/usr/bin/osascript -s o /path/to/the/script.scpt}
# under normal operation, my applescript spits out a string result
Rails.logger.info "Result: #{result}.\n"
sleep 30
end
For testing purposes I’ve replaced the (somewhat long and time consuming) production applescript with a one-liner. Here it is, in all its glory:
"It Worked!"
Because applescript treats the last line of the script as a return statement, this string gets passed into my result variable and ultimately logged in rails.
This works great – for a while. Eventually though (typically after several hours) the osascript line stops returning results. The daemon is still running but the osascript line, for all I can tell, is completely failing without explanation.
I can say with certainty that the daemon itself has not died because
- The rails log entries appear at correct intervals, and
- My sanity check of “foo.txt” regularly updates its last modified time stamp.
I thought I’d post an update to this in case anyone out there is having a similar problem. First off, I’ve found a workaround. Its an ugly hack for sure, but it gets the job done and it doesn’t crash every 2 hours. What I’m doing is establishing an ssh connection every time the job is run, which effectively lets the script run on a clean session.
Net::SSH.start('127.0.0.1', 'username', :password => 'password') do |ssh|
result = ssh.exec!('/usr/bin/osascript -s o /path/to/the/script.scpt')
end
And secondly, I’ve found a large number of crash reports in my ~/Library/Logs/DiagnosticReports directory. More and more I’m starting to believe that this whole ordeal has to do with some kind of session timeout or expiration.
Process: osascript [24884]
Path: /usr/bin/osascript
Identifier: osascript
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: ruby [24868]
Date/Time: 2011-02-03 16:40:28.526 -0500
OS Version: Mac OS X 10.6.6 (10J567)
Report Version: 6
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information:
abort() called
LaunchServices: GetOurLSSessionIDInit() returned err #1, securitySessionID == 0x0, vers=10600000 uid=501 euid=501web1.local] [Se
/Users/greg/Applescript/fbbuildutil.scpt
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libSystem.B.dylib 0x00007fff86fd6616 __kill + 10
1 libSystem.B.dylib 0x00007fff87076cca abort + 83
2 com.apple.LaunchServices 0x00007fff82faec84 GetOurLSSessionIDInit() + 298
3 libSystem.B.dylib 0x00007fff86fa08da pthread_once + 95
4 com.apple.LaunchServices 0x00007fff82faf29b SetupCoreApplicationServicesCommunicationPort() + 1343
5 com.apple.LaunchServices 0x00007fff82faf68d getProcessDispatchTable() + 19
6 com.apple.LaunchServices 0x00007fff82fb17a5 LSClientSideSharedMemory::GetClientSideSharedMemory(LSSessionID, bool) + 187
7 com.apple.LaunchServices 0x00007fff82fb1e87 _LSCopyApplicationInformationItem + 43
8 com.apple.AE 0x00007fff8722b735 aeGetThisProcess() + 49
9 com.apple.AE 0x00007fff8722b6df AEEventImpl::initializeData() + 89
10 com.apple.AE 0x00007fff8722b5c4 AEEventImpl::AEEventImpl(unsigned int, unsigned int, AEDesc const*, short, int) + 76
11 com.apple.AE 0x00007fff8722f33e AECreateAppleEvent + 88
12 osascript 0x0000000100001a42 0x100000000 + 6722
13 osascript 0x0000000100000fa0 0x100000000 + 4000
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x00007fff86fa116a kevent + 10
1 libSystem.B.dylib 0x00007fff86fa303d _dispatch_mgr_invoke + 154
2 libSystem.B.dylib 0x00007fff86fa2d14 _dispatch_queue_invoke + 185
3 libSystem.B.dylib 0x00007fff86fa283e _dispatch_worker_thread2 + 252
4 libSystem.B.dylib 0x00007fff86fa2168 _pthread_wqthread + 353
5 libSystem.B.dylib 0x00007fff86fa2005 start_wqthread + 13
Thread 2:
0 libSystem.B.dylib 0x00007fff86fa1f8a __workq_kernreturn + 10
1 libSystem.B.dylib 0x00007fff86fa239c _pthread_wqthread + 917
2 libSystem.B.dylib 0x00007fff86fa2005 start_wqthread + 13
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x00000000000001f5 rcx: 0x00007fff5fbfb378 rdx: 0x0000000000000000
rdi: 0x0000000000006134 rsi: 0x0000000000000006 rbp: 0x00007fff5fbfb390 rsp: 0x00007fff5fbfb378
r8: 0x000000010011d740 r9: 0x00000001001fc0a4 r10: 0x00007fff86fd2656 r11: 0x0000000000000202
r12: 0x00007fff5fbfb3c0 r13: 0x00007fff703ce328 r14: 0x00007fff82faeb5a r15: 0x00007fff70c465c0
rip: 0x00007fff86fd6616 rfl: 0x0000000000000202 cr2: 0x00000001000f8000
Binary Images:
0x100000000 - 0x100002ff7 +osascript ??? (???) /usr/bin/osascript
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0x7fff5fc00000 - 0x7fff5fc3bdef dyld 132.1 (???) /usr/lib/dyld
0x7fff8011d000 - 0x7fff8011efff liblangid.dylib ??? (???) /usr/lib/liblangid.dylib
0x7fff8016d000 - 0x7fff8046bfe7 com.apple.HIToolbox 1.6.4 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox
0x7fff80472000 - 0x7fff804befff libauto.dylib ??? (???) /usr/lib/libauto.dylib
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0x7fff80795000 - 0x7fff808aefef libGLProgrammability.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib
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0x7fff813e6000 - 0x7fff813e9ff7 libCoreVMClient.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreVMClient.dylib
0x7fff813ea000 - 0x7fff813fefff libGL.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
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0x7fff81940000 - 0x7fff8194ffff com.apple.NetFS 3.2.1 (3.2.1) /System/Library/Frameworks/NetFS.framework/Versions/A/NetFS
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