Support Git repos in the Nix path

E.g.

  $ nix-build -I nixpkgs=git://github.com/NixOS/nixpkgs '<nixpkgs>' -A hello

This is not extremely useful yet because you can't specify a
branch/revision.

2 files changed, 10 insertions, 0 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index d73800905..67558cc0b 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -1082,6 +1082,12 @@ bool statusOk(int status)
 }
 
 
+bool hasPrefix(const string & s, const string & suffix)
+{
+    return s.compare(0, suffix.size(), suffix) == 0;
+}
+
+
 bool hasSuffix(const string & s, const string & suffix)
 {
     return s.size() >= suffix.size() && string(s, s.size() - suffix.size()) == suffix;
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 6e5ab55e3..f3f0f92a0 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -333,6 +333,10 @@ template<class N> bool string2Float(const string & s, N & n)
 }
 
 
+/* Return true iff `s' starts with `prefix'. */
+bool hasPrefix(const string & s, const string & prefix);
+
+
 /* Return true iff `s' ends in `suffix'. */
 bool hasSuffix(const string & s, const string & suffix);