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import json
import os
import subprocess
with open(os.environ["NIX_ATTRS_JSON_FILE"], "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"]),
]))
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