implement support for CARGO_HOME

fixes #8

src/common.ts

@@ -20,10 +20,11 @@ export const stateKey = "RUST_CACHE_KEY";
 const stateHash = "RUST_CACHE_HASH";
 
 const home = os.homedir();
+const cargoHome = process.env.CARGO_HOME || path.join(home, ".cargo");
 export const paths = {
-  index: path.join(home, ".cargo/registry/index"),
-  cache: path.join(home, ".cargo/registry/cache"),
-  git: path.join(home, ".cargo/git"),
+  index: path.join(cargoHome, "registry/index"),
+  cache: path.join(cargoHome, "registry/cache"),
+  git: path.join(cargoHome, "git"),
   target: "target",
 };
 

src/restore.ts

@@ -9,6 +9,7 @@ async function run() {
     const { paths, key, restoreKeys } = await getCacheConfig();
 
     core.info(`Restoring paths:\n    ${paths.join("\n    ")}`);
+    core.info(`In directory:\n    ${process.cwd()}`);
     core.info(`Using keys:\n    ${[key, ...restoreKeys].join("\n    ")}`);
     const restoreKey = await cache.restoreCache(paths, key, restoreKeys);
     if (restoreKey) {

src/save.ts

@@ -35,7 +35,8 @@ async function run() {
     } catch {}
 
     core.info(`Saving paths:\n    ${savePaths.join("\n    ")}`);
-    core.info(`Using key "${key}".`);
+    core.info(`In directory:\n    ${process.cwd()}`);
+    core.info(`Using key:\n    ${key}`);
     await cache.saveCache(savePaths, key);
   } catch (e) {
     core.info(`[warning] ${e.message}`);