[MacPorts] #31056: Locking somewhat broken in MacPorts 2

[MacPorts]

#31056: Locking somewhat broken in MacPorts 2
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  defect                   |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  base                     |     Version:  2.0.1                                
 Keywords:                           |        Port:                                       
-------------------------------------+--------------------------------------
 There is something broken about locking ever since MacPorts 2.0.0.

 Example 1: I tell MacPorts to uninstall a port, while some other port is
 installing; it tells me it's locked, but then silently doesn't complete
 the operation when the lock disappears. Retrying while MacPorts is not
 busy with other tasks works fine.

 {{{
 fossil $ sudo port uninstall
 Waiting for lock on /opt/local/var/macports/registry/.registry.lock
 fossil $ port installed fossil
 The following ports are currently installed:
   fossil @20110523151112_1+universal (active)
 fossil $ sudo port uninstall
 Password:
 --->  Deactivating fossil @20110523151112_1+universal
 --->  Uninstalling fossil @20110523151112_1+universal
 fossil $
 }}}

 Example 2: I tell MacPorts to upgrade a port, while some other port is
 busy; after the lock disappears, it tells me the port I asked to upgrade
 is not installed, but of course it is installed, and retrying the upgrade
 works fine.

 {{{
 $ sudo port -ud upgrade py26-docutils
 Waiting for lock on /opt/local/var/macports/registry/.registry.lock
 Error: py26-docutils is not installed
 To report a bug, see <http://guide.macports.org/#project.tickets>
 $ sudo port -ud upgrade py26-docutils
 Password:
 DEBUG: epoch: in tree: 0 installed: 0
 DEBUG: py26-docutils 0.8.1_0 exists in the ports tree
 DEBUG: py26-docutils 0.8_0  is the latest installed
 DEBUG: py26-docutils 0.8_0  is active
 [snip successful upgrade]
 $
 }}}

 It does not seem to matter what ports are involved, or what MacPorts
 commands are being run; if an operation is being delayed via the lockfile,
 then it doesn't always run properly once the lock is removed.

 The issue is intermittent so I think it's a race condition.

-- 
Ticket URL: <https://trac.macports.org/ticket/31056>
MacPorts <http://www.macports.org/>
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