feat: check SOURCE_DATE_EPOCH

defaults to 315532800

README.md

@@ -53,7 +53,7 @@ export const fabricDNS = service.fabricDNS;
 * `DEFANG_FABRIC` - override the Defang Fabric service endpoint; defaults to prod
 * `DEFANG_FORCE_UP` - set this to `1` or `true` to force an update (for debugging only)
 * `DEFANG_DEBUG` - set this to `1` or `true` to enable debug logging
-
+* `SOURCE_DATE_EPOCH` - the modification time for the files in the build context; defaults to 315532800 (1980-01-01 00:00:00 UTC)
 
 ## Contributing
 

index.ts

@@ -11,7 +11,6 @@ import * as fabric from "./protos/io/defang/v1/fabric_grpc_pb";
 import * as pb from "./protos/io/defang/v1/fabric_pb";
 import { createTarball, uploadTarball } from "./upload";
 import {
-  HttpUrl,
   deleteUndefined,
   isEqual,
   isValidUint,

package.json

@@ -8,7 +8,7 @@
   "dependencies": {
     "@balena/dockerignore": "^1.0.2",
     "@grpc/grpc-js": "^1.8.17",
-    "@pulumi/pulumi": "~3.76.0",
+    "@pulumi/pulumi": "^3.76.0",
     "google-protobuf": "^3.21.2",
     "node-fetch": "^3.3.1",
     "tar": "^6.1.15"

upload.ts

@@ -1,11 +1,11 @@
+import ignore from "@balena/dockerignore";
 import { createReadStream, createWriteStream, promises, Stats } from "fs";
 import { tmpdir } from "os";
 import { join, normalize } from "path";
 import { promises as stream } from "stream";
 import * as tar from "tar";
-import ignore from "@balena/dockerignore";
 
-const SOURCE_DATE_EPOCH = 315532800; // 1980-01-01, same as nix-shell
+const SOURCE_DATE_EPOCH = process.env["SOURCE_DATE_EPOCH"] ?? "315532800"; // defaults to 1980-01-01, same as nix-shell
 const defaultDockerIgnore = `# Default .dockerignore file for Defang
 **/.DS_Store
 **/.direnv
@@ -56,6 +56,7 @@ export async function createTarball(
   }
   const filter = ignore({ ignorecase: false }).add(patterns).createFilter();
 
+  const mtime = parseInt(SOURCE_DATE_EPOCH); // can be NaN
   const tempdir = await promises.mkdtemp(join(tmpdir(), "defang-build-"));
   console.debug(`Using temporary folder ${tempdir}`);
   const temppath = join(tempdir, "context.tar.gz");
@@ -71,7 +72,7 @@ export async function createTarball(
             (foundDockerfile ||= normalize(p) === dockerfile), filter(p)
           ),
           gzip: true,
-          mtime: new Date(SOURCE_DATE_EPOCH * 1000), // seconds -> milliseconds
+          mtime: isNaN(mtime) ? undefined : new Date(mtime * 1000), // seconds -> milliseconds
           portable: true,
           strict: true,
         } as tar.PackOptions, // https://github.com/DefinitelyTyped/DefinitelyTyped/issues/67775