Support platforms without upstream ccache/sccache releases (#439)

Introduce UnknownPackage to handle platform/arch combinations (e.g.
linux-riscv64) that lack upstream binary releases. When install-method
is "detect", fall back to locally installed ccache/sccache instead of
failing.

Move the detect-and-skip logic from runInner into
UnknownPackage.install so all install paths go through the same
Package interface.

dist/restore/index.js

@@ -39060,6 +39060,7 @@ __nccwpck_require__.d(__webpack_exports__, {
   INSTALL_METHOD: () => (/* binding */ INSTALL_METHOD),
   PLATFORM: () => (/* binding */ PLATFORM),
   Package: () => (/* binding */ Package),
+  UnknownPackage: () => (/* binding */ UnknownPackage),
   VARIANT: () => (/* binding */ VARIANT),
   "default": () => (/* binding */ src_restore),
   selectMethod: () => (/* binding */ selectMethod),
@@ -86649,6 +86650,7 @@ var ARCH;
 (function (ARCH) {
     ARCH["X86_64"] = "x86_64";
     ARCH["AARCH64"] = "aarch64";
+    ARCH["RISCV64"] = "riscv64";
 })(ARCH || (ARCH = {}));
 var PLATFORM;
 (function (PLATFORM) {
@@ -86809,6 +86811,23 @@ class Package {
         }
     }
 }
+class UnknownPackage {
+    constructor(variant, arch, platform) {
+        this.variant = variant;
+        this.arch = arch;
+        this.platform = platform;
+    }
+    async install(method) {
+        if (method === INSTALL_METHOD.DETECT && await which(this.variant)) {
+            // If the install method is "detect" and the package is already installed,
+            // don't try to install it. This is to bypass architectures that are not
+            // released in upstream projects (linux-riscv64 for ccache/ccache for example).
+        }
+        else {
+            throw new Error(`No metadata found for combination: variant=${this.variant}, arch=${this.arch}, platform=${this.platform}`);
+        }
+    }
+}
 // platform/stuff helpers //
 function detectPlatform() {
     switch (external_process_namespaceObject.platform) {
@@ -86828,6 +86847,8 @@ function detectArchKey() {
             return "x86_64";
         case "arm64":
             return "aarch64";
+        case "riscv64":
+            return "riscv64";
         default:
             throw new Error(`Unsupported architecture: ${external_process_namespaceObject.arch}`);
     }
@@ -86843,7 +86864,8 @@ function selectPackage(variant) {
     const allMetadata = JSON.parse(rawData);
     const entry = allMetadata[variant]?.[archKey]?.[platform];
     if (!entry) {
-        throw new Error(`No metadata found for combination: variant=${variant}, arch=${archKey}, platform=${platform}`);
+        warning(`No metadata found for combination: variant=${variant}, arch=${archKey}, platform=${platform}`);
+        return new UnknownPackage(variant, archKey, platform);
     }
     return new Package(variant, archKey, platform, entry);
 }

dist/restore/metadata.json

@@ -81,6 +81,14 @@
         "dir": "sccache-v0.14.0-aarch64-apple-darwin",
         "artifact": "sccache-v0.14.0-aarch64-apple-darwin.tar.gz"
       }
+    },
+    "riscv64": {
+      "linux": {
+        "url": "https://github.com/mozilla/sccache/releases/download/v0.14.0/sccache-v0.14.0-riscv64gc-unknown-linux-musl.tar.gz",
+        "sha256": "67973734f48edfeb07dcc1adf174c4034dbcc1eb66cfae58076f3546684b9300",
+        "dir": "sccache-v0.14.0-riscv64gc-unknown-linux-musl",
+        "artifact": "sccache-v0.14.0-riscv64gc-unknown-linux-musl.tar.gz"
+      }
     }
   }
 }

metadata/generate.sh

@@ -65,7 +65,12 @@ package_info() {
 		*) _bad_platform "$platform" ;;
 		esac
 
-		pkg_name="sccache-$version-$arch-$suffix"
+		if [ "$arch" = "riscv64" ]; then
+			# sccache uses `riscv64gc` as arch name
+			pkg_name="sccache-$version-riscv64gc-$suffix"
+		else
+			pkg_name="sccache-$version-$arch-$suffix"
+		fi
 	fi
 
 	artifact="$pkg_name.$ext"

metadata/metadata.json

@@ -21,6 +21,9 @@
             "linux": "v0.14.0",
             "windows": "v0.14.0",
             "darwin": "v0.14.0"
+        },
+        "riscv64": {
+            "linux": "v0.14.0"
         }
     }
 }

src/restore.ts

@@ -17,6 +17,7 @@ export enum VARIANT {
 export enum ARCH {
   X86_64 = "x86_64",
   AARCH64 = "aarch64",
+  RISCV64 = "riscv64",
 }
 
 export enum PLATFORM {
@@ -205,6 +206,27 @@ export class Package {
   }
 }
 
+export class UnknownPackage {
+  constructor(
+    public readonly variant: VARIANT,
+    public readonly arch: ARCH,
+    public readonly platform: PLATFORM) { }
+
+  async install(method: INSTALL_METHOD): Promise<void> {
+    if (method === INSTALL_METHOD.DETECT && await io.which(this.variant)) {
+      // If the install method is "detect" and the package is already installed,
+      // don't try to install it. This is to bypass architectures that are not
+      // released in upstream projects (linux-riscv64 for ccache/ccache for example).
+    } else {
+      throw new Error(
+        `No metadata found for combination: variant=${this.variant}, arch=${this.arch}, platform=${this.platform}`
+      );
+    }
+  }
+}
+
+type MaybePackage = Package | UnknownPackage;
+
 // platform/stuff helpers //
 function detectPlatform(): PLATFORM {
   switch (process.platform) {
@@ -219,18 +241,20 @@ function detectPlatform(): PLATFORM {
   }
 }
 
-function detectArchKey(): "x86_64" | "aarch64" {
+function detectArchKey(): "x86_64" | "aarch64" | "riscv64" {
   switch (process.arch) {
     case "x64":
       return "x86_64";
     case "arm64":
       return "aarch64";
+    case "riscv64":
+      return "riscv64";
     default:
       throw new Error(`Unsupported architecture: ${process.arch}`);
   }
 }
 
-export function selectPackage(variant: VARIANT): Package {
+export function selectPackage(variant: VARIANT): MaybePackage {
   const platform = detectPlatform()
   const archKey = detectArchKey()
 
@@ -246,9 +270,8 @@ export function selectPackage(variant: VARIANT): Package {
   const entry: PackageMetadata = allMetadata[variant]?.[archKey]?.[platform];
 
   if (!entry) {
-    throw new Error(
-      `No metadata found for combination: variant=${variant}, arch=${archKey}, platform=${platform}`
-    );
+    core.warning(`No metadata found for combination: variant=${variant}, arch=${archKey}, platform=${platform}`)
+    return new UnknownPackage(variant, archKey as ARCH, platform as PLATFORM);
   }
 
   return new Package(variant, archKey as ARCH, platform as PLATFORM, entry);