[JIRA] [git] (JENKINS-20750) Git plugin 2.0 sometimes fail to fetch (timeouts) with weird error

Thu, 06 Feb 2014 11:17:24 -0800

I've run into this as well. It has something to do with concurrent msys processes. I've reported my findings to the msys and msysgit mailing lists. I haven't had time to really dig into it and figure out what's going on.

I've done a few things to try and work around the issue:

  1. Minimized concurrent jobs on each node. Matrix jobs in particular tend to cause more issues.
  2. Replaced all shell scripts in jobs with Python scripts. Windows batch scripts were also an option, but Windows batch scripting is absolutely terrible.
  3. Jobs often need to run additional git commands to properly clean the repository, deal with deleted submodules, etc. I run all of these through the following Python function that checks for a corrupt environment and aborts instead of just hanging. 
    def print_exec_corrupt_check(args):
    """Prints a command to be executed and then executes it
    """
    cmdline = " ".join(args)
    
    print "============================================================"
    print "Exec:", cmdline
    print
    sys.stdout.flush()

    # Add an environment check before the command
    cmdline = r'if [ ! -r "$HOME" ]; then echo "Corrupt environment detected, aborting..."; exit 1; fi; ' + cmdline

    subprocess.check_call([r'C:\Program Files (x86)\Git\bin\bash.exe', r'-c', cmdline], bufsize=-1)
    print
    sys.stdout.flush()

Possible future workarounds:

  1. Split matrix jobs out into individual jobs using the DSL plugin.
  2. Switch Jenkins to jgit. If jgit isn't mature enough yet, then maybe try Dulwich/Gittle.
  3. Fix the issue in msys.
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