Add fetchgit builtin

The function builtins.fetchgit fetches Git repositories at evaluation
time, similar to builtins.fetchTarball. (Perhaps the name should be
changed, being confusing with respect to Nixpkgs's fetchgit function,
with works at build time.)

Example:

  (import (builtins.fetchgit git://github.com/NixOS/nixpkgs) {}).hello

or

  (import (builtins.fetchgit {
    url = git://github.com/NixOS/nixpkgs-channels;
    rev = "nixos-16.03";
  }) {}).hello

Note that the result does not contain a .git directory.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index eed630517..6e39330e4 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -313,7 +313,7 @@ bool isUri(const string & s)
     size_t pos = s.find("://");
     if (pos == string::npos) return false;
     string scheme(s, 0, pos);
-    return scheme == "http" || scheme == "https" || scheme == "file" || scheme == "channel";
+    return scheme == "http" || scheme == "https" || scheme == "file" || scheme == "channel" || scheme == "git";
 }