uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/version-management/git-and-tools/darcs-to-git/default.nix

@@ -0,0 +1,81 @@
+{ lib, stdenv, fetchFromGitHub, ruby, gnugrep, diffutils, git, darcs }:
+
+stdenv.mkDerivation {
+  pname = "darcs-to-git";
+  version = "2015-06-04";
+
+  src = fetchFromGitHub {
+    owner = "purcell";
+    repo = "darcs-to-git";
+    rev = "e5fee32495908fe0f7d700644c7b37347b7a0a5b";
+    sha256 = "sha256-UQI3av+0zj1SNwEonwuk5n2RjZN3+tSJFJuFCjrorFM=";
+  };
+
+  patchPhase = let
+    matchExecution = ''(\<(output_of|system|run)\([^"%]*("|%w\()|^[^"`]*`)'';
+  in ''
+    sed -r -i \
+      -e '1s|^#!.*|#!${ruby}/bin/ruby|' \
+      -e 's!${matchExecution}git\>!\1${git}/bin/git!' \
+      -e 's!${matchExecution}darcs\>!\1${darcs}/bin/darcs!' \
+      -e 's!${matchExecution}diff\>!\1${diffutils}/bin/diff!' \
+      -e 's!\<egrep\>!${gnugrep}/bin/egrep!g' \
+      -e 's!%w\(darcs init\)!%w(${darcs}/bin/darcs init)!' \
+      darcs-to-git
+  '';
+
+  installPhase = ''
+    install -vD darcs-to-git "$out/bin/darcs-to-git"
+  '';
+
+  doCheck = true;
+
+  checkPhase = ''
+    orig_dir="$(pwd)"
+    darcs_repos="$(pwd)/darcs_test_repos"
+    git_repos="$(pwd)/git_test_repos"
+    test_home="$(pwd)/test_home"
+    mkdir "$darcs_repos" "$git_repos" "$test_home"
+    cd "$darcs_repos"
+    ${darcs}/bin/darcs init
+    echo "this is a test file" > new_file1
+    ${darcs}/bin/darcs add new_file1
+    HOME="$test_home" ${darcs}/bin/darcs record -a -m c1 -A none
+    echo "testfile1" > new_file1
+    echo "testfile2" > new_file2
+    ${darcs}/bin/darcs add new_file2
+    HOME="$test_home" ${darcs}/bin/darcs record -a -m c2 -A none
+    ${darcs}/bin/darcs mv new_file2 only_one_file
+    rm -f new_file1
+    HOME="$test_home" ${darcs}/bin/darcs record -a -m c3 -A none
+    cd "$git_repos"
+    HOME="$test_home" PATH= "$orig_dir/darcs-to-git" "$darcs_repos"
+    assertFileContents() {
+      echo -n "File $1 contains '$2'..." >&2
+      if [ "x$(cat "$1")" = "x$2" ]; then
+        echo " passed." >&2
+        return 0
+      else
+        echo " failed: '$(cat "$1")' != '$2'" >&2
+        return 1
+      fi
+    }
+    echo "Checking if converted repository matches original repository:" >&2
+    assertFileContents only_one_file testfile2
+    ${git}/bin/git reset --hard HEAD^
+    assertFileContents new_file1 testfile1
+    assertFileContents new_file2 testfile2
+    ${git}/bin/git reset --hard HEAD^
+    assertFileContents new_file1 "this is a test file"
+    echo "All checks passed." >&2
+    cd "$orig_dir"
+    rm -rf "$darcs_repos" "$git_repos" "$test_home"
+  '';
+
+  meta = {
+    description = "Converts a Darcs repository into a Git repository";
+    homepage = "http://www.sanityinc.com/articles/converting-darcs-repositories-to-git";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.unix;
+  };
+}