From 034b035a91e33d8878fa223bef2ac030286c9c3c Mon Sep 17 00:00:00 2001
From: Michael Wolf <mw@philologue.net>
Date: Sat, 7 Feb 2026 09:12:21 -0500
Subject: [PATCH] Cache downloaded binaries in ~/.cache/diachron/v1/binaries

Downloads Node.js and pnpm to a shared cache directory, then
copies into the project tree. Repeated project bootstraps skip
the network entirely if the cache is warm.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 sync.sh | 66 ++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 40 insertions(+), 26 deletions(-)

diff --git a/sync.sh b/sync.sh
index 8719815..a7e6dfe 100755
--- a/sync.sh
+++ b/sync.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-# Note: This is kind of AI slop and needs to be more carefully reviewed.
-
 set -eu
 
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
@@ -25,50 +23,66 @@ pnpm_checksum_var="pnpm_checksum_${platform}"
 pnpm_binary_url="${!pnpm_binary_var}"
 pnpm_checksum="${!pnpm_checksum_var}"
 
-# Set up paths for shims to use
-nodejs_dist_dir="diachron/binaries/$nodejs_dirname"
-nodejs_bin_dir="$nodejs_dist_dir/bin"
+cache_dir="$HOME/.cache/diachron/v1/binaries"
+local_dir="$DIR/diachron/binaries"
+mkdir -p "$cache_dir" "$local_dir"
 
-# Ensure correct node version is installed
-node_installed_checksum_file="$DIR/diachron/binaries/.node.checksum"
-node_installed_checksum=""
-if [ -f "$node_installed_checksum_file" ]; then
-    node_installed_checksum=$(cat "$node_installed_checksum_file")
-fi
+# read_checksum_file <path>
+# Prints the contents of a checksum file, or empty string
+# if the file does not exist.
+read_checksum_file() {
+    if [ -f "$1" ]; then
+        cat "$1"
+    fi
+}
 
-if [ "$node_installed_checksum" != "$nodejs_checksum" ]; then
+# Ensure Node.js is in the cache
+cached_node_checksum=$(read_checksum_file "$cache_dir/.node.checksum")
+if [ "$cached_node_checksum" != "$nodejs_checksum" ]; then
     echo "Downloading Node.js for $platform..."
-    node_archive="$DIR/diachron/downloads/node.tar.xz"
+    node_archive="$cache_dir/node.tar.xz"
     curl -fsSL "$nodejs_binary" -o "$node_archive"
 
     echo "Verifying checksum..."
     echo "$nodejs_checksum  $node_archive" | sha256_check
 
     echo "Extracting Node.js..."
-    tar -xf "$node_archive" -C "$DIR/diachron/binaries"
+    rm -rf "${cache_dir:?}/$nodejs_dirname"
+    tar -xf "$node_archive" -C "$cache_dir"
     rm "$node_archive"
 
-    echo "$nodejs_checksum" >"$node_installed_checksum_file"
+    echo "$nodejs_checksum" >"$cache_dir/.node.checksum"
 fi
 
-# Ensure correct pnpm version is installed
-pnpm_binary="$DIR/diachron/binaries/pnpm"
-pnpm_installed_checksum_file="$DIR/diachron/binaries/.pnpm.checksum"
-pnpm_installed_checksum=""
-if [ -f "$pnpm_installed_checksum_file" ]; then
-    pnpm_installed_checksum=$(cat "$pnpm_installed_checksum_file")
+# Copy Node.js into the working directory if needed
+local_node_checksum=$(read_checksum_file "$local_dir/.node.checksum")
+if [ "$local_node_checksum" != "$nodejs_checksum" ]; then
+    echo "Installing Node.js into project..."
+    rm -rf "${local_dir:?}/$nodejs_dirname"
+    cp -R "$cache_dir/$nodejs_dirname" "$local_dir/$nodejs_dirname"
+    echo "$nodejs_checksum" >"$local_dir/.node.checksum"
 fi
 
-if [ "$pnpm_installed_checksum" != "$pnpm_checksum" ]; then
+# Ensure pnpm is in the cache
+cached_pnpm_checksum=$(read_checksum_file "$cache_dir/.pnpm.checksum")
+if [ "$cached_pnpm_checksum" != "$pnpm_checksum" ]; then
     echo "Downloading pnpm for $platform..."
-    curl -fsSL "$pnpm_binary_url" -o "$pnpm_binary"
+    curl -fsSL "$pnpm_binary_url" -o "$cache_dir/pnpm"
 
     echo "Verifying checksum..."
-    echo "$pnpm_checksum  $pnpm_binary" | sha256_check
+    echo "$pnpm_checksum  $cache_dir/pnpm" | sha256_check
 
-    chmod +x "$pnpm_binary"
+    chmod +x "$cache_dir/pnpm"
 
-    echo "$pnpm_checksum" >"$pnpm_installed_checksum_file"
+    echo "$pnpm_checksum" >"$cache_dir/.pnpm.checksum"
+fi
+
+# Copy pnpm into the working directory if needed
+local_pnpm_checksum=$(read_checksum_file "$local_dir/.pnpm.checksum")
+if [ "$local_pnpm_checksum" != "$pnpm_checksum" ]; then
+    echo "Installing pnpm into project..."
+    cp "$cache_dir/pnpm" "$local_dir/pnpm"
+    echo "$pnpm_checksum" >"$local_dir/.pnpm.checksum"
 fi
 
 # Get golang binaries in place