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linux/nix/fake-rustup.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# Fake rustup for nix-managed Rust toolchains
+
+case "$1" in
+  run)
+    if [[ "$2" == "stable" ]]; then
+      shift 2
+      if [[ $# -eq 0 ]]; then
+        echo "fake rustup: no command given" >&2
+        exit 1
+      fi
+      exec "$@"
+      exit 0
+    fi
+    ;;
+
+  toolchain)
+    if [[ "$2" == "list" ]]; then
+      echo "stable (default)"
+      exit 0
+    fi
+    ;;
+    
+  target)
+    if [[ "$2" == "list" && "$3" == "--toolchain" && "$4" == "stable" && "$5" == "--installed" ]]; then
+      echo "x86_64-unknown-linux-gnu"
+      exit 0
+    fi
+    ;;
+esac
+
+echo "fake rustup: the command:" >&2
+echo "  rustup $*" >&2
+echo "…is not mocked yet" >&2
+exit 1