Set GIT_ALLOW_PROTOCOL to limit dangerous protocols

See git commit 33cfccbbf35a -- some protocols allow arbitrary command
execution as part of the URL. Instead of blindly allowing those,
whitelist the allowed URL protocols unless the user has already done so.

Bug: Issue 210
Change-Id: I6bd8e721aa5e3dab53ef28cfdc8fde33eb74ef76
1 file changed