cargo-c: add update script

Signed-off-by: Marcin Serwin <marcin@serwin.dev>

pkgs/by-name/ca/cargo-c/package.nix

@@ -10,14 +10,17 @@
   rav1e,
 }:
 
+let
+  # this version may need to be updated along with package version
+  cargoVersion = "0.80.0";
+in
 rustPlatform.buildRustPackage rec {
   pname = "cargo-c";
   version = "0.10.2";
 
   src = fetchCrate {
     inherit pname;
-    # this version may need to be updated along with package version
-    version = "${version}+cargo-0.80.0";
+    version = "${version}+cargo-${cargoVersion}";
     hash = "sha256-ltxd4n3oo8ZF/G/zmR4FSVtNOkxwCjDv6PdxkmWxZ+8=";
   };
 
@@ -47,8 +50,11 @@ rustPlatform.buildRustPackage rec {
     runHook postInstallCheck
   '';
 
-  passthru.tests = {
-    inherit rav1e;
+  passthru = {
+    tests = {
+      inherit rav1e;
+    };
+    updateScript.command = [ ./update.sh ];
   };
 
   meta = {

pkgs/by-name/ca/cargo-c/update.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p bash curl coreutils nix-update jq
+
+set -ex
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
+
+latestVersion=`curl https://crates.io/api/v1/crates/cargo-c/versions | jq '.versions[0].num | split("+cargo-")'`
+crateVersion=`jq -r '.[0]' <<< $latestVersion`
+cargoVersion=`jq -r '.[1]' <<< $latestVersion`
+
+sed -E -i "s/(cargoVersion = ).*;/\1\"$cargoVersion\";/" $SCRIPT_DIR/package.nix
+
+nix-update cargo-c --version="$crateVersion"