Description Gunnar Wagenknecht 2011-03-12 03:38:36 EST

Eclipse 3.7M6
EGit 0.11.3


I have on project in my workspace from an Eclipse Git mirror 
(cloned from git://dev.eclipse.org/org.eclipse.pde/build.git)

I only update the repo occasionally and today was one of those days. ;) I right clicked the repo and performed "Fetch" but then I realized that I wanted a "pull". Thus I right clicked again and selected "Pull". The fetch was still in progress but I think there are proper scheduling rules in place which prevent both operations from executing at the same time.

The pull operation failed with the message below. Even after a restart of Eclipse the pull operation still fails with the same exception.


---------------------------------------------------
eclipse.buildId=I20110310-1119
java.version=1.6.0_23
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=de_DE
Command-line arguments:  -os win32 -ws win32 -arch x86


Error
Sat Mar 12 09:23:52 CET 2011
Exception caught during execution of merge command. java.io.IOException: Cannot lock D:\Development\eclipse\pde\build.git\.git\index

org.eclipse.jgit.api.errors.JGitInternalException: Exception caught during execution of merge command. java.io.IOException: Cannot lock D:\Development\eclipse\pde\build.git\.git\index
at org.eclipse.jgit.api.MergeCommand.call(MergeCommand.java:243)
at org.eclipse.jgit.api.PullCommand.call(PullCommand.java:285)
at org.eclipse.egit.core.op.PullOperation$1.run(PullOperation.java:68)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2310)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2292)
at org.eclipse.egit.core.op.PullOperation.execute(PullOperation.java:77)
at org.eclipse.egit.ui.internal.actions.PullFromUpstreamActionHandler$1.run(PullFromUpstreamActionHandler.java:66)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.io.IOException: Cannot lock D:\Development\eclipse\pde\build.git\.git\index
at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:187)
at org.eclipse.jgit.lib.Repository.lockDirCache(Repository.java:932)
at org.eclipse.jgit.api.MergeCommand.call(MergeCommand.java:179)
... 7 more
---------------------------------------------------


Running git on the command line gave the following message:
---------------------------------------------------
fatal: Unable to create '.../.git/index.lock': File exists.

If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.
---------------------------------------------------


It seems that this is the case. After deleting the file manually I was able to successfully pull in EGit.

I think that EGit can do better. Instead of showing the error dialog the IOException could be a special lock failed/lock file exists exception which would bring up a dialog with a similar message and a "recover/try again" button  or so. EGit could also perform some checks/cleanups on the index (in case it really crashed).