#!/bin/sh

echo "nix-cache: Storing new store items"
NEW_NIX_STORE_CONTENTS_FILE=$(mktemp)
find /nix/store/ -maxdepth 1 > $NEW_NIX_STORE_CONTENTS_FILE

sort $OLD_NIX_STORE_CONTENTS_FILE -o $OLD_NIX_STORE_CONTENTS_FILE
sort $NEW_NIX_STORE_CONTENTS_FILE -o $NEW_NIX_STORE_CONTENTS_FILE

echo "nix-cache: Comparing store paths"
FILTERED_NIX_STORE_CONTENTS_FILE=$(mktemp)
comm -13 $OLD_NIX_STORE_CONTENTS_FILE $NEW_NIX_STORE_CONTENTS_FILE > $FILTERED_NIX_STORE_CONTENTS_FILE
echo "nix-cache: New store paths:"
cat $FILTERED_NIX_STORE_CONTENTS_FILE | sed 's/^/    /g'

if test -n "$(head -n1 $FILTERED_NIX_STORE_CONTENTS_FILE)"; then
    echo "nix-cache: Sending new paths to cache"
    nix copy --to "$STORE_URL" $(cat $FILTERED_NIX_STORE_CONTENTS_FILE) || true
else
    echo "nix-cache: Nothing to send"
fi