Consider all installed toolchains in cache key

README.md

@@ -143,7 +143,8 @@ This cache is automatically keyed by:
 
 - the github [`job_id`](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_id)
 (if `add-job-id-key` is `"true"`),
-- the rustc release / host / hash,
+- the rustc release / host / hash (for all installed toolchains when
+  available),
 - the following values, if `add-rust-environment-hash-key` is `"true"`:
   - the value of some compiler-specific environment variables (eg. RUSTFLAGS, etc), and
   - a hash of all `Cargo.lock` / `Cargo.toml` files found anywhere in the repository (if present).

dist/restore/index.js

@@ -150809,7 +150809,7 @@ class CacheConfig {
         /** The prefix portion of the cache key */
         this.keyPrefix = "";
         /** The rust version considered for the cache key */
-        this.keyRust = "";
+        this.keyRust = [];
         /** The environment variables considered for the cache key */
         this.keyEnvs = [];
         /** The files considered for the cache key */
@@ -150863,12 +150863,15 @@ class CacheConfig {
         // The env vars are sorted, matched by prefix and hashed into the
         // resulting environment hash.
         let hasher = external_crypto_default().createHash("sha1");
-        const rustVersion = await getRustVersion(cmdFormat);
+        const rustVersions = Array.from(await getRustVersions(cmdFormat));
-        let keyRust = `${rustVersion.release} ${rustVersion.host}`;
+        // Doesn't matter how they're sorted, just as long as it's deterministic.
-        hasher.update(keyRust);
+        rustVersions.sort();
-        hasher.update(rustVersion["commit-hash"]);
+        for (const rustVersion of rustVersions) {
-        keyRust += ` (${rustVersion["commit-hash"]})`;
+            const { release, host, "commit-hash": commitHash } = rustVersion;
-        self.keyRust = keyRust;
+            const keyRust = `${release} ${host} ${commitHash}`;
+            hasher.update(keyRust);
+            self.keyRust.push(keyRust);
+        }
         // these prefixes should cover most of the compiler / rust / cargo keys
         const envPrefixes = ["CARGO", "CC", "CFLAGS", "CXX", "CMAKE", "RUST"];
         envPrefixes.push(...lib_core.getInput("env-vars").split(/\s+/).filter(Boolean));
@@ -151052,7 +151055,10 @@ class CacheConfig {
         lib_core.info(`.. Prefix:`);
         lib_core.info(`  - ${this.keyPrefix}`);
         lib_core.info(`.. Environment considered:`);
-        lib_core.info(`  - Rust Version: ${this.keyRust}`);
+        lib_core.info(`  - Rust Versions:`);
+        for (const rust of this.keyRust) {
+            lib_core.info(`    - ${rust}`);
+        }
         for (const env of this.keyEnvs) {
             lib_core.info(`  - ${env}`);
         }
@@ -151087,9 +151093,31 @@ function isCacheUpToDate() {
 function digest(hasher) {
     return hasher.digest("hex").substring(0, HASH_LENGTH);
 }
-async function getRustVersion(cmdFormat) {
+async function getRustVersions(cmdFormat) {
-    const stdout = await getCmdOutput(cmdFormat, "rustc -vV");
+    const versions = new Set();
-    let splits = stdout
+    versions.add(parseRustVersion(await getCmdOutput(cmdFormat, "rustc -vV")));
+    const stdout = await (async () => {
+        try {
+            return await getCmdOutput(cmdFormat, "rustup toolchain list --quiet");
+        }
+        catch (e) {
+            lib_core.warning(`Error running rustup toolchain list, falling back to default toolchain only: ${e}`);
+            return undefined;
+        }
+    })();
+    if (stdout !== undefined) {
+        for (const toolchain of stdout.split(/[\n\r]+/)) {
+            const trimmed = toolchain.trim();
+            if (!trimmed) {
+                continue;
+            }
+            versions.add(parseRustVersion(await getCmdOutput(cmdFormat, `rustup run ${toolchain} rustc -vV`)));
+        }
+    }
+    return versions;
+}
+function parseRustVersion(stdout) {
+    const splits = stdout
         .split(/[\n\r]+/)
         .filter(Boolean)
         .map((s) => s.split(":").map((s) => s.trim()))

dist/save/index.js

@@ -150809,7 +150809,7 @@ class CacheConfig {
         /** The prefix portion of the cache key */
         this.keyPrefix = "";
         /** The rust version considered for the cache key */
-        this.keyRust = "";
+        this.keyRust = [];
         /** The environment variables considered for the cache key */
         this.keyEnvs = [];
         /** The files considered for the cache key */
@@ -150863,12 +150863,15 @@ class CacheConfig {
         // The env vars are sorted, matched by prefix and hashed into the
         // resulting environment hash.
         let hasher = external_crypto_default().createHash("sha1");
-        const rustVersion = await getRustVersion(cmdFormat);
+        const rustVersions = Array.from(await getRustVersions(cmdFormat));
-        let keyRust = `${rustVersion.release} ${rustVersion.host}`;
+        // Doesn't matter how they're sorted, just as long as it's deterministic.
-        hasher.update(keyRust);
+        rustVersions.sort();
-        hasher.update(rustVersion["commit-hash"]);
+        for (const rustVersion of rustVersions) {
-        keyRust += ` (${rustVersion["commit-hash"]})`;
+            const { release, host, "commit-hash": commitHash } = rustVersion;
-        self.keyRust = keyRust;
+            const keyRust = `${release} ${host} ${commitHash}`;
+            hasher.update(keyRust);
+            self.keyRust.push(keyRust);
+        }
         // these prefixes should cover most of the compiler / rust / cargo keys
         const envPrefixes = ["CARGO", "CC", "CFLAGS", "CXX", "CMAKE", "RUST"];
         envPrefixes.push(...core.getInput("env-vars").split(/\s+/).filter(Boolean));
@@ -151052,7 +151055,10 @@ class CacheConfig {
         core.info(`.. Prefix:`);
         core.info(`  - ${this.keyPrefix}`);
         core.info(`.. Environment considered:`);
-        core.info(`  - Rust Version: ${this.keyRust}`);
+        core.info(`  - Rust Versions:`);
+        for (const rust of this.keyRust) {
+            core.info(`    - ${rust}`);
+        }
         for (const env of this.keyEnvs) {
             core.info(`  - ${env}`);
         }
@@ -151087,9 +151093,31 @@ function isCacheUpToDate() {
 function digest(hasher) {
     return hasher.digest("hex").substring(0, HASH_LENGTH);
 }
-async function getRustVersion(cmdFormat) {
+async function getRustVersions(cmdFormat) {
-    const stdout = await getCmdOutput(cmdFormat, "rustc -vV");
+    const versions = new Set();
-    let splits = stdout
+    versions.add(parseRustVersion(await getCmdOutput(cmdFormat, "rustc -vV")));
+    const stdout = await (async () => {
+        try {
+            return await getCmdOutput(cmdFormat, "rustup toolchain list --quiet");
+        }
+        catch (e) {
+            core.warning(`Error running rustup toolchain list, falling back to default toolchain only: ${e}`);
+            return undefined;
+        }
+    })();
+    if (stdout !== undefined) {
+        for (const toolchain of stdout.split(/[\n\r]+/)) {
+            const trimmed = toolchain.trim();
+            if (!trimmed) {
+                continue;
+            }
+            versions.add(parseRustVersion(await getCmdOutput(cmdFormat, `rustup run ${toolchain} rustc -vV`)));
+        }
+    }
+    return versions;
+}
+function parseRustVersion(stdout) {
+    const splits = stdout
         .split(/[\n\r]+/)
         .filter(Boolean)
         .map((s) => s.split(":").map((s) => s.trim()))

src/config.ts

@@ -41,7 +41,7 @@ export class CacheConfig {
   /** The prefix portion of the cache key */
   private keyPrefix = "";
   /** The rust version considered for the cache key */
-  private keyRust = "";
+  private keyRust: Array<string> = [];
   /** The environment variables considered for the cache key */
   private keyEnvs: Array<string> = [];
   /** The files considered for the cache key */
@@ -104,14 +104,16 @@ export class CacheConfig {
     // resulting environment hash.
 
     let hasher = crypto.createHash("sha1");
-    const rustVersion = await getRustVersion(cmdFormat);
+    const rustVersions = Array.from(await getRustVersions(cmdFormat));
+    // Doesn't matter how they're sorted, just as long as it's deterministic.
+    rustVersions.sort();
 
-    let keyRust = `${rustVersion.release} ${rustVersion.host}`;
+    for (const rustVersion of rustVersions) {
-    hasher.update(keyRust);
+      const { release, host, "commit-hash": commitHash } = rustVersion;
-    hasher.update(rustVersion["commit-hash"]);
+      const keyRust = `${release} ${host} ${commitHash}`;
-
+      hasher.update(keyRust);
-    keyRust += ` (${rustVersion["commit-hash"]})`;
+      self.keyRust.push(keyRust);
-    self.keyRust = keyRust;
+    }
 
     // these prefixes should cover most of the compiler / rust / cargo keys
     const envPrefixes = ["CARGO", "CC", "CFLAGS", "CXX", "CMAKE", "RUST"];
@@ -334,7 +336,10 @@ export class CacheConfig {
     core.info(`.. Prefix:`);
     core.info(`  - ${this.keyPrefix}`);
     core.info(`.. Environment considered:`);
-    core.info(`  - Rust Version: ${this.keyRust}`);
+    core.info(`  - Rust Versions:`);
+    for (const rust of this.keyRust) {
+      core.info(`    - ${rust}`);
+    }
     for (const env of this.keyEnvs) {
       core.info(`  - ${env}`);
     }
@@ -379,9 +384,33 @@ interface RustVersion {
   "commit-hash": string;
 }
 
-async function getRustVersion(cmdFormat: string): Promise<RustVersion> {
+async function getRustVersions(cmdFormat: string): Promise<Set<RustVersion>> {
-  const stdout = await getCmdOutput(cmdFormat, "rustc -vV");
+  const versions = new Set<RustVersion>();
-  let splits = stdout
+
+  versions.add(parseRustVersion(await getCmdOutput(cmdFormat, "rustc -vV")));
+
+  const stdout = await (async () => {
+    try {
+      return await getCmdOutput(cmdFormat, "rustup toolchain list --quiet");
+    } catch (e) {
+      core.warning(`Error running rustup toolchain list, falling back to default toolchain only: ${e}`);
+      return undefined;
+    }
+  })();
+  if (stdout !== undefined) {
+    for (const toolchain of stdout.split(/[\n\r]+/)) {
+      const trimmed = toolchain.trim();
+      if (!trimmed) {
+        continue;
+      }
+      versions.add(parseRustVersion(await getCmdOutput(cmdFormat, `rustup run ${toolchain} rustc -vV`)));
+    }
+  }
+  return versions;
+}
+
+function parseRustVersion(stdout: string): RustVersion {
+  const splits = stdout
     .split(/[\n\r]+/)
     .filter(Boolean)
     .map((s) => s.split(":").map((s) => s.trim()))