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Merge pull request #14630 from NixOS/prefetch-fixes

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nix/prefetch: Be honest about when path name is derived from URL
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John Ericson 2025-11-23 22:24:17 +00:00 • committed by GitHub
commit 487c6b6c46
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1 changed files with 16 additions and 11 deletions
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27
src/nix/prefetch.cc
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@ -59,7 +59,7 @@ std::string resolveMirrorUrl(EvalState & state, const std::string & url)
std::tuple<StorePath, Hash> prefetchFile(
ref<Store> store,
const VerbatimURL & url,
std::optional<std::string> name,
std::optional<std::string> maybeName,
HashAlgorithm hashAlgo,
std::optional<Hash> expectedHash,
bool unpack,
@ -68,16 +68,21 @@ std::tuple<StorePath, Hash> prefetchFile(
ContentAddressMethod method =
unpack || executable ? ContentAddressMethod::Raw::NixArchive : ContentAddressMethod::Raw::Flat;
/* Figure out a name in the Nix store. */
if (!name) {
name = url.lastPathSegment();
if (!name || name->empty())
throw Error("cannot figure out file name for '%s'", url.to_string());
}
std::string name = maybeName
.or_else([&]() {
/* Figure out a name in the Nix store. */
auto derivedFromUrl = url.lastPathSegment();
if (!derivedFromUrl || derivedFromUrl->empty())
throw Error("cannot figure out file name for '%s'", url.to_string());
return derivedFromUrl;
})
.value();
try {
checkName(*name);
checkName(name);
} catch (BadStorePathName & e) {
e.addTrace({}, "file name '%s' was extracted from URL '%s'", *name, url.to_string());
if (!maybeName)
e.addTrace({}, "file name '%s' was extracted from URL '%s'", name, url.to_string());
throw;
}
@ -89,7 +94,7 @@ std::tuple<StorePath, Hash> prefetchFile(
if (expectedHash) {
hashAlgo = expectedHash->algo;
storePath =
store->makeFixedOutputPathFromCA(*name, ContentAddressWithReferences::fromParts(method, *expectedHash, {}));
store->makeFixedOutputPathFromCA(name, ContentAddressWithReferences::fromParts(method, *expectedHash, {}));
if (store->isValidPath(*storePath))
hash = expectedHash;
else
@ -138,7 +143,7 @@ std::tuple<StorePath, Hash> prefetchFile(
Activity act(*logger, lvlChatty, actUnknown, fmt("adding '%s' to the store", url.to_string()));
auto info = store->addToStoreSlow(*name, makeFSSourceAccessor(tmpFile), method, hashAlgo, {}, expectedHash);
auto info = store->addToStoreSlow(name, makeFSSourceAccessor(tmpFile), method, hashAlgo, {}, expectedHash);
storePath = info.path;
assert(info.ca);
hash = info.ca->hash;