small code style improvements, README and CHANGELOG updates

CHANGELOG.md

@@ -1,8 +1,13 @@
 # Changelog
 
+## 2.1.0
+
+- Only hash `Cargo.{lock,toml}` files in the configured workspace directories.
+
 ## 2.0.2
 
 - Avoid calling `cargo metadata` on pre-cleanup.
+- Added `prefix-key`, `cache-directories` and `cache-targets` options.
 
 ## 2.0.1
 

README.md

@@ -14,11 +14,12 @@ sensible defaults.
 
 - uses: Swatinem/rust-cache@v2
   with:
-    # The prefix cache key, this can be changed to start a new cache manually
+    # The prefix cache key, this can be changed to start a new cache manually.
     # default: "v0-rust"
     prefix-key: ""
 
-    # An additional cache key that is stable over multiple jobs
+    # A cache key that is used instead of the automatic `job`-based key,
+    # and is stable over multiple jobs.
     # default: empty
     shared-key: ""
 
@@ -41,10 +42,11 @@ sensible defaults.
     # default: ". -> target"
     workspaces: ""
 
-    # Additional non workspace directories, separated by newlines
+    # Additional non workspace directories to be cached, separated by newlines.
     cache-directories: ""
 
     # Determines whether workspace `target` directories are cached.
+    # If `false`, only the cargo registry will be cached.
     # default: "true"
     cache-targets: ""
 

action.yml

@@ -3,34 +3,34 @@ description: "A GitHub Action that implements smart caching for rust/cargo proje
 author: "Arpad Borsos <swatinem@swatinem.de>"
 inputs:
   prefix-key:
-    description: "The prefix cache key, this can be changed to start a new cache manually"
+    description: "The prefix cache key, this can be changed to start a new cache manually."
     required: false
     default: "v0-rust"
   shared-key:
-    description: "An additional cache key that is stable over multiple jobs"
+    description: "A cache key that is used instead of the automatic `job`-based key, and is stable over multiple jobs."
     required: false
   key:
-    description: "An additional key for the cache"
+    description: "An additional cache key that is added alongside the automatic `job`-based cache key and can be used to further differentiate jobs."
     required: false
   env-vars:
-    description: "Additional environment variables to include in the cache key, separated by spaces"
+    description: "Additional environment variables to include in the cache key, separated by spaces."
     required: false
   workspaces:
-    description: "Paths to multiple Cargo workspaces and their target directories, separated by newlines"
+    description: "Paths to multiple Cargo workspaces and their target directories, separated by newlines."
     required: false
   cache-directories:
-    description: "Additional non workspace directories, separated by newlines"
+    description: "Additional non workspace directories to be cached, separated by newlines."
     required: false
   cache-targets:
-    description: "Determines whether workspace targets are cached"
+    description: "Determines whether workspace targets are cached. If `false`, only the cargo registry will be cached."
     required: false
     default: "true"
   cache-on-failure:
-    description: "Cache even if the build fails. Defaults to false"
+    description: "Cache even if the build fails. Defaults to false."
     required: false
 outputs:
   cache-hit:
-    description: "A boolean value that indicates an exact match was found"
+    description: "A boolean value that indicates an exact match was found."
 runs:
   using: "node16"
   main: "dist/restore/index.js"

package-lock.json

@@ -5,7 +5,6 @@
   "requires": true,
   "packages": {
     "": {
-      "name": "rust-cache",
       "version": "2.0.2",
       "license": "LGPL-3.0",
       "dependencies": {

src/config.ts

@@ -50,7 +50,7 @@ export class CacheConfig {
     // This uses either the `shared-key` input,
     // or the `key` input combined with the `job` key.
 
-    let key = core.getInput("prefix-key");
+    let key = core.getInput("prefix-key") || "v0-rust";
 
     const sharedKey = core.getInput("shared-key");
     if (sharedKey) {
@@ -132,29 +132,23 @@ export class CacheConfig {
     self.workspaces = workspaces;
 
     if (!lockHash) {
-      hasher = crypto.createHash("sha1");
+      keyFiles = keyFiles.concat(await globFiles("rust-toolchain\nrust-toolchain.toml"));
-
-      async function globHash(pattern: string): Promise<string[]> {
-        const globber = await glob.create(pattern, {
-          followSymbolicLinks: false,
-        });
-        return await globber.glob();
-      }
-
-      keyFiles = keyFiles.concat(await globHash("rust-toolchain\nrust-toolchain.toml"));
       for (const workspace of workspaces) {
         const root = workspace.root;
-        keyFiles = keyFiles.concat(await globHash(`${root}/**/Cargo.toml\n${root}/**/Cargo.lock\n${root}/**/rust-toolchain\n${root}/**/rust-toolchain.toml`));
+        keyFiles.push(
+          ...(await globFiles(
+            `${root}/**/Cargo.toml\n${root}/**/Cargo.lock\n${root}/**/rust-toolchain\n${root}/**/rust-toolchain.toml`,
+          )),
+        );
       }
-
       keyFiles.sort((a, b) => a.localeCompare(b));
 
+      hasher = crypto.createHash("sha1");
       for (const file of keyFiles) {
         for await (const chunk of fs.createReadStream(file)) {
           hasher.update(chunk);
         }
       }
-
       lockHash = hasher.digest("hex");
 
       core.saveState(STATE_LOCKFILE_HASH, lockHash);
@@ -167,13 +161,13 @@ export class CacheConfig {
     self.cacheKey = key;
 
     self.cachePaths = [CARGO_HOME];
-    const cacheTargets = core.getInput("cache-targets").toLowerCase();
+    const cacheTargets = core.getInput("cache-targets").toLowerCase() || "true";
     if (cacheTargets === "true") {
       self.cachePaths.push(...workspaces.map((ws) => ws.target));
     }
 
     const cacheDirectories = core.getInput("cache-directories");
-    for (const dir of cacheDirectories.trim().split("\n")) {
+    for (const dir of cacheDirectories.trim().split(/\s+/).filter(Boolean)) {
       self.cachePaths.push(dir);
     }
 
@@ -224,3 +218,10 @@ async function getRustVersion(): Promise<RustVersion> {
     .filter((s) => s.length === 2);
   return Object.fromEntries(splits);
 }
+
+async function globFiles(pattern: string): Promise<string[]> {
+  const globber = await glob.create(pattern, {
+    followSymbolicLinks: false,
+  });
+  return await globber.glob();
+}