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narinfo: Change NAR URLs to be addressed on the NAR hash instead of the compressed hash

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This change is to simplify [Trustix](https://github.com/tweag/trustix) indexing and makes it possible to reconstruct this URL regardless of the compression used.

In particular this means that 7c2e9ca597/contrib/nix/nar/nar.go (L61-L71) can be removed and only the bits that are required to establish trust needs to be published in the Trustix build logs.
This commit is contained in:
adisbladis 2021-01-18 18:13:07 +01:00
parent 259100332f
commit 144cad9069
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GPG key ID: 110BFAD44C6249B7
2 changed files with 2 additions and 6 deletions
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6
src/libstore/binary-cache-store.cc
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@ -176,11 +176,7 @@ ref<const ValidPathInfo> BinaryCacheStore::addToStoreCommon(
auto [fileHash, fileSize] = fileHashSink.finish(); auto [fileHash, fileSize] = fileHashSink.finish();
narInfo->fileHash = fileHash; narInfo->fileHash = fileHash;
narInfo->fileSize = fileSize; narInfo->fileSize = fileSize;
narInfo->url = "nar/" + narInfo->fileHash->to_string(Base32, false) + ".nar" narInfo->url = "nar/" + info.narHash.to_string(Base32, false) + ".nar";
+ (compression == "xz" ? ".xz" :
compression == "bzip2" ? ".bz2" :
compression == "br" ? ".br" :
"");
auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count(); auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now2 - now1).count();
printMsg(lvlTalkative, "copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache", printMsg(lvlTalkative, "copying path '%1%' (%2% bytes, compressed %3$.1f%% in %4% ms) to binary cache",

2
tests/binary-cache.sh
View file

@ -55,7 +55,7 @@ basicTests
# Test whether Nix notices if the NAR doesn't match the hash in the NAR info. # Test whether Nix notices if the NAR doesn't match the hash in the NAR info.
clearStore clearStore
nar=$(ls $cacheDir/nar/*.nar.xz | head -n1) nar=$(ls $cacheDir/nar/*.nar | head -n1)
mv $nar $nar.good mv $nar $nar.good
mkdir -p $TEST_ROOT/empty mkdir -p $TEST_ROOT/empty
nix-store --dump $TEST_ROOT/empty | xz > $nar nix-store --dump $TEST_ROOT/empty | xz > $nar