A more reliable way to check if a configured git repository exists and actually accessible

Review Request #871 — Created May 20, 2009 and submitted

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This change allows to check if git actually installed even if os.environ doesn't contain PATH which includes a directory with git binary.
Such situations happen e.g. in [some] Apache/mod_fastcgi setup (I guess an actual PATH is unavailable from within fcgi-scripts due to security reasons or whatever)

 
chipx86
  1. Looks good, thanks. Committed as r1982.
  2.