1 files changed, 37 insertions, 0 deletions
diff --git a/users/Profpatsch/execline/default.nix b/users/Profpatsch/execline/default.nix
new file mode 100644
index 0000000000..752774e6ad
--- /dev/null
+++ b/users/Profpatsch/execline/default.nix
@@ -0,0 +1,37 @@
+{ depot, pkgs, lib, ... }:
+
+let
+  exec-helpers = depot.nix.writers.rustSimpleLib
+    {
+      name = "exec-helpers";
+    }
+    (builtins.readFile ./exec_helpers.rs);
+
+  print-one-env = depot.nix.writers.rustSimple
+    {
+      name = "print-one-env";
+      dependencies = [
+        depot.users.Profpatsch.execline.exec-helpers
+      ];
+    } ''
+    extern crate exec_helpers;
+    use std::os::unix::ffi::OsStrExt;
+    use std::io::Write;
+
+    fn main() {
+      let args = exec_helpers::args("print-one-env", 1);
+      let valname = std::ffi::OsStr::from_bytes(&args[0]);
+      match std::env::var_os(&valname) {
+        None => exec_helpers::die_user_error("print-one-env", format!("Env variable `{:?}` is not set", valname)),
+        Some(val) => std::io::stdout().write_all(&val.as_bytes()).unwrap()
+      }
+    }
+  '';
+
+in
+depot.nix.readTree.drvTargets {
+  inherit
+    exec-helpers
+    print-one-env
+    ;
+}