Test script/build-bin's archive choice, hash check and refusal

The test runs the script with stub uname, ldd, curl, unzip and nix-shell
first on PATH, so it needs no network and no bun. The download and the
compile stay untested.

Model: opus-5-5

README.md

@@ -156,9 +156,10 @@ requests. The "Library reference" below covers both.
 `quak backup` never prompts, so cron can run it. `make install` builds quak as
 one binary and copies it to `~/bin/quak`. It uses bun, a JavaScript runtime, to
 bundle the built `dist/` into one executable. Besides what Getting Started
-needs, `make install` needs `make`. It downloads bun from GitHub with `curl` and
+needs, `make install` needs `make`. On Linux it downloads bun from GitHub with
-unpacks it with `unzip`. It checks the download against a SHA-256 hash in the
+`curl` and unpacks it with `unzip`. It checks the download against a SHA-256
-repo. `make install` works on Linux and macOS.
+hash in the repo. On macOS it runs bun through `nix-shell -p bun`, so it needs
+[nix](https://nixos.org/download).
 
 On Linux systems that use the musl C library, such as Alpine, `make install`
 downloads bun's musl build. On Alpine, both that bun and `~/bin/quak` need the
@@ -1936,9 +1937,11 @@ These apply to people and to coding agents alike.
     - container images by digest;
     - the nvm archive `script/bootstrap` downloads, and the Python packages
       `bin/clip-keyword-vectors` installs, by SHA-256 hash;
-    - the bun builds `script/build-bin` downloads, by SHA-256 hash;
+    - bun's glibc and musl builds, which `script/build-bin` downloads on Linux,
+      by SHA-256 hash;
     - Node and yarn, when `script/bootstrap` installs them, by version.
 - Not pinned:
+    - bun on macOS, which `script/build-bin` takes from `nix-shell -p bun`;
     - `make` and `git`, which `script/bootstrap` installs from the system
       package manager when they are missing, as every `Dockerfile` stage does;
     - `bash` and `curl`, which `script/bootstrap` installs the same way when it

script/build-bin

@@ -3,13 +3,12 @@
 # executable, bin/quak, which reports the version script/build stamped. Our own
 # extension to scripts-to-rule-them-all.
 #
-# bun compiles the binary from a copy of its own executable, so the binary
+# bun compiles the binary from a copy of its own executable. On Linux, nix's
-# loads the same libraries as the bun that built it. nix's bun loads libraries
+# bun loads through a C library in the nix store, and so does a binary compiled
-# from the nix store: on Linux its C library, on macOS its ICU. A binary
+# from it. nix-collect-garbage can delete that library, and the binary then no
-# compiled from it loads them too. nix-collect-garbage can delete them, and the
+# longer starts. On Linux this script therefore compiles with bun's own release
-# binary then no longer starts. This script therefore compiles with bun's own
+# build, which loads through the system's C library. It downloads that build
-# release build, which loads only the system's libraries. It downloads that
+# and checks it against the hash below before running it.
-# build and checks it against the hash below before running it.
 set -eu
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
@@ -23,8 +22,6 @@ BUN_LINUX_X64_BASELINE_SHA256="9d8a24292a7068090205daac0a5a223f5f69736f5287e37bf
 BUN_LINUX_X64_MUSL_BASELINE_SHA256="88ca7c7ad235b498f549eea2f770f434e9f0f5e9ba95168a2d3a1f235184c394"
 BUN_LINUX_AARCH64_SHA256="70bae41b3908b0a120e1e58c5c8af30e74afae3b8d11b0d3fdd8e787ddfb4b22"
 BUN_LINUX_AARCH64_MUSL_SHA256="5385e978107ce4934298d8d6afe9bfbb898683f6cc23e6753a0da60bc60c5b81"
-BUN_DARWIN_X64_BASELINE_SHA256="a98ba6a480f22fda9b343626b906a4e26aa53618bf85d2bc5928ecf2ba45f0ed"
-BUN_DARWIN_AARCH64_SHA256="5467e3f65dba526b9fea98f0cce04efafc0c63e169733ec27b876a3ad32da190"
 
 # compile_with_downloaded_bun <archive-name> <sha256>
 compile_with_downloaded_bun() {
@@ -32,12 +29,7 @@ compile_with_downloaded_bun() {
     trap 'rm -rf "$tmp"' EXIT
     curl -fsSL -o "$tmp/$1.zip" \
         "https://github.com/oven-sh/bun/releases/download/bun-v$BUN_VERSION/$1.zip"
-    # macOS always has shasum, but not every macOS has sha256sum.
-    if command -v sha256sum >/dev/null 2>&1; then
     echo "$2  $tmp/$1.zip" | sha256sum -c -
-    else
-        echo "$2  $tmp/$1.zip" | shasum -a 256 -c -
-    fi
     unzip -q "$tmp/$1.zip" -d "$tmp"
     "$tmp/$1/bun" build dist/bin/quak.js --compile --outfile bin/quak
 }
@@ -67,17 +59,13 @@ main() {
             compile_with_downloaded_bun bun-linux-aarch64-musl \
                 "$BUN_LINUX_AARCH64_MUSL_SHA256"
             ;;
-        Darwin-x86_64)
+        Linux-*)
-            compile_with_downloaded_bun bun-darwin-x64-baseline \
+            echo "build-bin: bun has no release build for Linux on $(uname -m)" >&2
-                "$BUN_DARWIN_X64_BASELINE_SHA256"
+            exit 1
-            ;;
-        Darwin-arm64)
-            compile_with_downloaded_bun bun-darwin-aarch64 \
-                "$BUN_DARWIN_AARCH64_SHA256"
             ;;
         *)
-            echo "build-bin: bun has no release build for $(uname -s) on $(uname -m)" >&2
+            nix-shell -p bun --run \
-            exit 1
+                "bun build dist/bin/quak.js --compile --outfile bin/quak"
             ;;
     esac
 }

test/packaging/build-bin.test.ts

@@ -1,22 +1,23 @@
 // `script/build-bin` compiles `bin/quak`, the single binary that the README's
 // cron setup runs. bun compiles it from a copy of its own executable, so the
-// binary loads the same libraries as the bun that built it. nix's bun loads
+// binary loads through the same C library as the bun that built it. nix's bun
-// libraries from the nix store, which garbage collection can delete: on Linux
+// loads through a C library in the nix store, which garbage collection can
-// its C library, on macOS its ICU. The script therefore downloads bun's own
+// delete. On Linux the script therefore downloads bun's own release build,
-// release build, which loads only the system's libraries.
+// which loads through the system's C library.
 //
 // What the script promises, and why each test matters:
 //
-// - Each system, machine and C library that bun publishes a build for gets its
+// - On Linux, each machine and C library that bun publishes a build for gets
-//   own archive: Linux on x86-64 or arm64, with glibc or with musl, as on
+//   its own archive: x86-64 or arm64, with glibc or with musl, as on Alpine. A
-//   Alpine, and macOS on Intel or Apple silicon. A bun built for another
+//   bun built for another machine or C library does not start, and
-//   system, machine or C library does not start, and `make install` fails.
+//   `make install` fails.
 // - The archive's SHA-256 must match the one in the script before anything in
 //   the archive runs. Without that check, a tampered download would build the
 //   binary that cron runs.
-// - Any other system or machine stops with an error, and never falls back to
+// - Linux on any other machine stops with an error. Building there with nix's
-//   nix's bun. Building with nix's bun would bring back the dependency on the
+//   bun would bring back the dependency on the nix store.
-//   nix store.
+// - Other systems, such as macOS, compile with nix's bun as before, and
+//   download nothing.
 //
 // Each test copies the script into a fresh directory, which the script then
 // treats as the checkout, and runs it there. Stubs first on PATH stand in for
@@ -139,40 +140,41 @@ describe("script/build-bin", () => {
     // The stub curl writes a file that is not the archive, so the hash check
     // must stop the script before unzip runs. A script without the check would
     // run unzip, and the stub bun it unpacks would write bin/quak.
-    // On macOS `uname -m` says arm64 on Apple silicon, where bun's archive
-    // says aarch64.
     it.each([
-        ["Linux", "x86_64", "glibc", "bun-linux-x64-baseline.zip"],
+        ["x86_64", "glibc", "bun-linux-x64-baseline.zip"],
-        ["Linux", "x86_64", "musl", "bun-linux-x64-musl-baseline.zip"],
+        ["x86_64", "musl", "bun-linux-x64-musl-baseline.zip"],
-        ["Linux", "aarch64", "glibc", "bun-linux-aarch64.zip"],
+        ["aarch64", "glibc", "bun-linux-aarch64.zip"],
-        ["Linux", "aarch64", "musl", "bun-linux-aarch64-musl.zip"],
+        ["aarch64", "musl", "bun-linux-aarch64-musl.zip"],
-        ["Darwin", "x86_64", "glibc", "bun-darwin-x64-baseline.zip"],
-        ["Darwin", "arm64", "glibc", "bun-darwin-aarch64.zip"],
     ])(
-        "on %s %s with %s, downloads %s and stops when its hash does not match",
+        "on Linux %s with %s, downloads %s and stops when its hash does not match",
-        (system, machine, libc, archive) => {
+        (machine, libc, archive) => {
-            const result = runBuildBin(system, machine, libc);
+            const result = runBuildBin("Linux", machine, libc);
             expect(argumentsOf("curl")).toContain(
                 "https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/" +
                     archive,
             );
             expect(result.status).not.toBe(0);
             expect(ran("unzip")).toBe(false);
-            expect(ran("nix-shell")).toBe(false);
             expect(existsSync(join(checkout, "bin/quak"))).toBe(false);
         },
     );
 
-    it.each([
+    it("stops on a Linux machine that bun publishes no build for", () => {
-        ["Linux", "riscv64"],
+        const result = runBuildBin("Linux", "riscv64");
-        ["FreeBSD", "amd64"],
-    ])(
-        "stops on %s %s, which bun publishes no build for",
-        (system, machine) => {
-            const result = runBuildBin(system, machine);
         expect(result.status).not.toBe(0);
         expect(ran("curl")).toBe(false);
         expect(ran("nix-shell")).toBe(false);
-        },
+    });
-    );
+
+    it("compiles with nix's bun on macOS", () => {
+        const result = runBuildBin("Darwin", "arm64");
+        expect(result.status).toBe(0);
+        expect(ran("curl")).toBe(false);
+        expect(argumentsOf("nix-shell")).toEqual([
+            "-p",
+            "bun",
+            "--run",
+            "bun build dist/bin/quak.js --compile --outfile bin/quak",
+        ]);
+    });
 });