Issue: repack semi-frequently fails on Windows (msysgit) - suspecting file descriptor issues

Hi all,

over the years I've had the same phenomenon with various versions of msysgit (now at 1.9.5.msysgit.0, on Windows 7 64bit), so I'm now sufficiently confident of it being a long-standing, longer-term issue and thus I'm reporting it now.

Since I'm doing development in a sufficiently rebase-heavy manner, I seem to aggregate a lot of objects. Thus, when fetching content I'm sufficiently frequently greeted with a git gc run. This, however, does not work fully reliably:

    Auto packing the repository for optimum performance. You may also
    run "git gc" manually. See "git help gc" for more information.
    Counting objects: 206527, done.
    Delta compression using up to 4 threads.
    Compressing objects: 100% (27430/27430), done.
    Writing objects: 100% (206527/206527), done.
    Total 206527 (delta 178632), reused 206527 (delta 178632)
    Unlink of file '.git/objects/pack/pack-ab1712db0a94b5c55538d3b4cb3660cedc264c3c.pack' failed. Should I try again? (y/n) n
    Unlink of file '.git/objects/pack/pack-ab1712db0a94b5c55538d3b4cb3660cedc264c3c.idx' failed. Should I try again? (y/n) n
    Checking connectivity: 206527, done.

A workable workaround for this recurring issue (such a fetch will fail repeatedly, thereby hampering my ability to update properly) is to manually do a "git gc --auto" prior to the fetch (which will then succeed).