2023-02-16 17:41:37 +00:00
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import json
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import os
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import subprocess
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2023-11-16 04:20:00 +00:00
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with open(os.environ["NIX_ATTRS_JSON_FILE"], "r") as f:
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2023-02-16 17:41:37 +00:00
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closures = json.load(f)["closure"]
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os.chdir(os.environ["out"])
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nixPrefix = os.environ["NIX_STORE"] # Usually /nix/store
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with open("nix-cache-info", "w") as f:
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f.write("StoreDir: " + nixPrefix + "\n")
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def dropPrefix(path):
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return path[len(nixPrefix + "/"):]
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for item in closures:
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narInfoHash = dropPrefix(item["path"]).split("-")[0]
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xzFile = "nar/" + narInfoHash + ".nar.xz"
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with open(xzFile, "w") as f:
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subprocess.run("nix-store --dump %s | xz -c" % item["path"], stdout=f, shell=True)
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fileHash = subprocess.run(["nix-hash", "--base32", "--type", "sha256", item["path"]], capture_output=True).stdout.decode().strip()
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fileSize = os.path.getsize(xzFile)
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# Rename the .nar.xz file to its own hash to match "nix copy" behavior
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finalXzFile = "nar/" + fileHash + ".nar.xz"
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os.rename(xzFile, finalXzFile)
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with open(narInfoHash + ".narinfo", "w") as f:
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f.writelines((x + "\n" for x in [
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"StorePath: " + item["path"],
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"URL: " + finalXzFile,
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"Compression: xz",
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"FileHash: sha256:" + fileHash,
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"FileSize: " + str(fileSize),
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"NarHash: " + item["narHash"],
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"NarSize: " + str(item["narSize"]),
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"References: " + " ".join(dropPrefix(ref) for ref in item["references"]),
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]))
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