import json import os import subprocess with open(".attrs.json", "r") as f: closures = json.load(f)["closure"] os.chdir(os.environ["out"]) nixPrefix = os.environ["NIX_STORE"] # Usually /nix/store with open("nix-cache-info", "w") as f: f.write("StoreDir: " + nixPrefix + "\n") def dropPrefix(path): return path[len(nixPrefix + "/"):] for item in closures: narInfoHash = dropPrefix(item["path"]).split("-")[0] xzFile = "nar/" + narInfoHash + ".nar.xz" with open(xzFile, "w") as f: subprocess.run("nix-store --dump %s | xz -c" % item["path"], stdout=f, shell=True) fileHash = subprocess.run(["nix-hash", "--base32", "--type", "sha256", item["path"]], capture_output=True).stdout.decode().strip() fileSize = os.path.getsize(xzFile) # Rename the .nar.xz file to its own hash to match "nix copy" behavior finalXzFile = "nar/" + fileHash + ".nar.xz" os.rename(xzFile, finalXzFile) with open(narInfoHash + ".narinfo", "w") as f: f.writelines((x + "\n" for x in [ "StorePath: " + item["path"], "URL: " + finalXzFile, "Compression: xz", "FileHash: sha256:" + fileHash, "FileSize: " + str(fileSize), "NarHash: " + item["narHash"], "NarSize: " + str(item["narSize"]), "References: " + " ".join(dropPrefix(ref) for ref in item["references"]), ]))