vend: init at unstable-2020-06-04

This is used to provide alternate vendoring for go.

pkgs/development/tools/vend/default.nix

@@ -0,0 +1,26 @@
+{ stdenv, buildGoModule, fetchFromGitHub }:
+
+buildGoModule {
+  pname = "vend";
+  version = "unstable-2020-06-04";
+
+  patches = [./remove_tidy.patch];
+
+  # A permanent fork from master is maintained to avoid non deterministic go tidy
+  src = fetchFromGitHub {
+    owner = "c00w";
+    repo = "vend";
+    rev = "24fdebfdb2c3cc0516321a9cf33a3fd81c209c04";
+    sha256 = "112p9dz9by2h2m3jha2bv1bvzn2a86bpg1wphgmf9gksjpwy835l";
+  };
+
+  vendorSha256 = null;
+
+  meta = with stdenv.lib; {
+    homepage = "https://github.com/c00w/vend";
+    description = "A utility which vendors go code including c dependencies";
+    maintainers = with maintainers; [ c00w ];
+    license = licenses.mit;
+    platforms = platforms.all;
+  };
+}

pkgs/development/tools/vend/remove_tidy.patch

@@ -0,0 +1,13 @@
+diff --git a/cli/cmd.go b/cli/cmd.go
+index c766559..3a133fd 100644
+--- a/cli/cmd.go
++++ b/cli/cmd.go
+@@ -12,7 +12,7 @@ import (
+ // UpdateModule makes sure the module is updated ready to vendor the
+ // dependencies.
+ func UpdateModule() {
+-	var commands = []string{"tidy", "download", "vendor"}
++	var commands = []string{"download", "vendor"}
+ 
+ 	for _, command := range commands {
+ 		cmd := exec.Command("go", "mod", command)