[Buildbot] #3251: 'Git' command fails to clobber local repository when repository has a corrupt index file

[Buildbot trac]

#3251: 'Git' command fails to clobber local repository when repository has a
corrupt index file
----------------------+-----------------------------------
Reporter:  Varriount  |      Owner:
    Type:  defect     |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.9      |   Keywords:  git windows buildstep
----------------------+-----------------------------------
 The 'Git' buildstep fails to remove the and reclone the target repository
 when the 'git' executable returns
 {{{
 error: bad signature
 fatal: index file corrupt
 }}}
 even when the 'clobberOnFailure' parameter is set to 'True'

 The build slave is running on Windows 8.1, with Python 2.7 x64 and build
 slave version 0.8.9
 The build host is running on Ubuntu 14.04.2 LTS with buildbot version
 0.8.9

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Ticket URL: <http://trac.buildbot.net/ticket/3251>
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Buildbot: build/test automation