adding sha checksum logic to speed up subsequent script/bootstrap runs

script/unzipper

@@ -16,12 +16,72 @@ trap cleanup EXIT
 mkdir -p "$SHARDS_INSTALL_PATH"
 mkdir -p "$SHARDS_CACHE_PATH/github.com"
 
-# iterate over all the cached shards in the vendor/shards/cache directory
-for shard in $(find "$SHARDS_CACHED" -type f -maxdepth 1); do
+# check if the .shards.info file exists, if it doesn't this is a fresh bootstrapping
+if [ ! -f "$VENDOR_DIR/shards/install/.shards.info" ]; then
+  # if no .shards.info file found, this must be a fresh bootstrapping
+
+  # iterate over all the cached shards in the vendor/shards/cache directory
+  for shard in $(find "$SHARDS_CACHED" -type f -maxdepth 1); do
+
     # unzip the file into the TRASHDIR
     unzip -q -o "$shard" -d "$TRASHDIR"
+
+    # get the only name of the dir in the TRASHDIR
+    shard_name=$(ls "$TRASHDIR/shard/")
+
+    # clear up the shard in the install dir if it exists
+    rm -rf "$SHARDS_INSTALL_PATH/$shard_name"
+
     # move the shard and cache directories to the correct location
     mv -f "$TRASHDIR/shard/"* "$SHARDS_INSTALL_PATH/" 2>/dev/null || true
     mv -f "$TRASHDIR/cache/"* "$SHARDS_CACHE_PATH/github.com/" 2>/dev/null || true
-done
 
+    # cleanup the TRASHDIR
+    rm -rf "$TRASHDIR/shard"
+    rm -rf "$TRASHDIR/cache"
+  done
+
+else
+  # if found .shards.info file, this must be a bootstrap re-run - we will check if the shards have changed by comparing the sha256 of the cached shard and the sha256 of the current shard
+
+  file="vendor/shards/install/.shards.info"
+
+  # Use yq to parse the file and extract shard names and versions
+  shards=$(yq eval '.shards | to_entries | .[] | "\(.key)|\(.value.git)|\(.value.version)"' $file)
+
+  # Loop over each shard
+  echo "$shards" | while IFS= read -r shard; do
+    # Extract name and version
+    name=$(echo $shard | cut -d'|' -f1)
+    version=$(echo $shard | cut -d'|' -f3)
+
+    shard_cache_sha=$(shasum -a 256 "$SHARDS_CACHED/$name-$version.shard" | cut -d' ' -f1)
+    shard_current_sha=""
+    if [ -f "$SHARDS_INSTALL_PATH/$name/.shard.vendor.cache.sha256" ]; then
+      shard_current_sha=$(cat "$SHARDS_INSTALL_PATH/$name/.shard.vendor.cache.sha256")
+    fi
+
+    if [ "$shard_cache_sha" != "$shard_current_sha" ]; then
+      echo "shard $name $version has changed, updating"
+
+      # unzip the file into the TRASHDIR
+      unzip -q -o "$SHARDS_CACHED/$name-$version.shard" -d "$TRASHDIR"
+
+      # clear up the shard in the install dir if it exists
+      rm -rf "$SHARDS_INSTALL_PATH/$name"
+
+      # move the shard and cache directories to the correct location
+      mv -f "$TRASHDIR/shard/"* "$SHARDS_INSTALL_PATH/" 2>/dev/null || true
+      mv -f "$TRASHDIR/cache/"* "$SHARDS_CACHE_PATH/github.com/" 2>/dev/null || true
+
+      # write the new sha to the .shard.vendor.cache.sha256 file
+      cat > "$SHARDS_INSTALL_PATH/$name/.shard.vendor.cache.sha256" <<< "$shard_cache_sha"
+
+      # cleanup the TRASHDIR
+      rm -rf "$TRASHDIR/shard"
+      rm -rf "$TRASHDIR/cache"
+    else
+      echo "shard $name $version has not changed, skipping"
+    fi
+  done
+fi