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Merge pull request #10152 from edolstra/fetcher-cleanups

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Fetcher cleanups
This commit is contained in:
Eelco Dolstra 2024-03-07 10:21:11 +01:00 committed by GitHub
commit 7d76bc8a39
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12 changed files with 112 additions and 71 deletions
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2
src/libexpr/flake/flakeref.cc
View File

@ -284,7 +284,7 @@ FlakeRef FlakeRef::fromAttrs(const fetchers::Attrs & attrs)
std::pair<StorePath, FlakeRef> FlakeRef::fetchTree(ref<Store> store) const
{
auto [storePath, lockedInput] = input.fetch(store);
auto [storePath, lockedInput] = input.fetchToStore(store);
return {std::move(storePath), FlakeRef(std::move(lockedInput), subdir)};
}

3
src/libexpr/primops/fetchMercurial.cc
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@ -64,8 +64,7 @@ static void prim_fetchMercurial(EvalState & state, const PosIdx pos, Value * * a
if (rev) attrs.insert_or_assign("rev", rev->gitRev());
auto input = fetchers::Input::fromAttrs(std::move(attrs));
// FIXME: use name
auto [storePath, input2] = input.fetch(state.store);
auto [storePath, input2] = input.fetchToStore(state.store);
auto attrs2 = state.buildBindings(8);
state.mkStorePathString(storePath, attrs2.alloc(state.sOutPath));

2
src/libexpr/primops/fetchTree.cc
View File

@ -182,7 +182,7 @@ static void fetchTree(
state.checkURI(input.toURLString());
auto [storePath, input2] = input.fetch(state.store);
auto [storePath, input2] = input.fetchToStore(state.store);
state.allowPath(storePath);

107
src/libfetchers/fetchers.cc
View File

@ -161,7 +161,7 @@ bool Input::contains(const Input & other) const
return false;
}
std::pair<StorePath, Input> Input::fetch(ref<Store> store) const
std::pair<StorePath, Input> Input::fetchToStore(ref<Store> store) const
{
if (!scheme)
throw Error("cannot fetch unsupported input '%s'", attrsToJSON(toAttrs()));
@ -186,56 +186,85 @@ std::pair<StorePath, Input> Input::fetch(ref<Store> store) const
auto [storePath, input] = [&]() -> std::pair<StorePath, Input> {
try {
return scheme->fetch(store, *this);
auto [accessor, final] = getAccessorUnchecked(store);
auto storePath = nix::fetchToStore(*store, SourcePath(accessor), FetchMode::Copy, final.getName());
auto narHash = store->queryPathInfo(storePath)->narHash;
final.attrs.insert_or_assign("narHash", narHash.to_string(HashFormat::SRI, true));
scheme->checkLocks(*this, final);
return {storePath, final};
} catch (Error & e) {
e.addTrace({}, "while fetching the input '%s'", to_string());
throw;
}
}();
auto narHash = store->queryPathInfo(storePath)->narHash;
input.attrs.insert_or_assign("narHash", narHash.to_string(HashFormat::SRI, true));
if (auto prevNarHash = getNarHash()) {
if (narHash != *prevNarHash)
throw Error((unsigned int) 102, "NAR hash mismatch in input '%s' (%s), expected '%s', got '%s'",
to_string(),
store->printStorePath(storePath),
prevNarHash->to_string(HashFormat::SRI, true),
narHash.to_string(HashFormat::SRI, true));
}
if (auto prevLastModified = getLastModified()) {
if (input.getLastModified() != prevLastModified)
throw Error("'lastModified' attribute mismatch in input '%s', expected %d",
input.to_string(), *prevLastModified);
}
if (auto prevRev = getRev()) {
if (input.getRev() != prevRev)
throw Error("'rev' attribute mismatch in input '%s', expected %s",
input.to_string(), prevRev->gitRev());
}
if (auto prevRevCount = getRevCount()) {
if (input.getRevCount() != prevRevCount)
throw Error("'revCount' attribute mismatch in input '%s', expected %d",
input.to_string(), *prevRevCount);
}
return {std::move(storePath), input};
}
void InputScheme::checkLocks(const Input & specified, const Input & final) const
{
if (auto prevNarHash = specified.getNarHash()) {
if (final.getNarHash() != prevNarHash) {
if (final.getNarHash())
throw Error((unsigned int) 102, "NAR hash mismatch in input '%s', expected '%s' but got '%s'",
specified.to_string(), prevNarHash->to_string(HashFormat::SRI, true), final.getNarHash()->to_string(HashFormat::SRI, true));
else
throw Error((unsigned int) 102, "NAR hash mismatch in input '%s', expected '%s' but got none",
specified.to_string(), prevNarHash->to_string(HashFormat::SRI, true));
}
}
if (auto prevLastModified = specified.getLastModified()) {
if (final.getLastModified() != prevLastModified)
throw Error("'lastModified' attribute mismatch in input '%s', expected %d",
final.to_string(), *prevLastModified);
}
if (auto prevRev = specified.getRev()) {
if (final.getRev() != prevRev)
throw Error("'rev' attribute mismatch in input '%s', expected %s",
final.to_string(), prevRev->gitRev());
}
if (auto prevRevCount = specified.getRevCount()) {
if (final.getRevCount() != prevRevCount)
throw Error("'revCount' attribute mismatch in input '%s', expected %d",
final.to_string(), *prevRevCount);
}
}
std::pair<ref<InputAccessor>, Input> Input::getAccessor(ref<Store> store) const
{
try {
return scheme->getAccessor(store, *this);
auto [accessor, final] = getAccessorUnchecked(store);
scheme->checkLocks(*this, final);
return {accessor, std::move(final)};
} catch (Error & e) {
e.addTrace({}, "while fetching the input '%s'", to_string());
throw;
}
}
std::pair<ref<InputAccessor>, Input> Input::getAccessorUnchecked(ref<Store> store) const
{
// FIXME: cache the accessor
if (!scheme)
throw Error("cannot fetch unsupported input '%s'", attrsToJSON(toAttrs()));
auto [accessor, final] = scheme->getAccessor(store, *this);
accessor->fingerprint = scheme->getFingerprint(store, final);
return {accessor, std::move(final)};
}
Input Input::applyOverrides(
std::optional<std::string> ref,
std::optional<Hash> rev) const
@ -372,18 +401,6 @@ void InputScheme::clone(const Input & input, const Path & destDir) const
throw Error("do not know how to clone input '%s'", input.to_string());
}
std::pair<StorePath, Input> InputScheme::fetch(ref<Store> store, const Input & input)
{
auto [accessor, input2] = getAccessor(store, input);
auto storePath = fetchToStore(*store, SourcePath(accessor), FetchMode::Copy, input2.getName());
return {storePath, input2};
}
std::pair<ref<InputAccessor>, Input> InputScheme::getAccessor(ref<Store> store, const Input & input) const
{
throw UnimplementedError("InputScheme must implement fetch() or getAccessor()");
}
std::optional<ExperimentalFeature> InputScheme::experimentalFeature() const
{
return {};

25
src/libfetchers/fetchers.hh
View File

@ -80,10 +80,21 @@ public:
* Fetch the entire input into the Nix store, returning the
* location in the Nix store and the locked input.
*/
std::pair<StorePath, Input> fetch(ref<Store> store) const;
std::pair<StorePath, Input> fetchToStore(ref<Store> store) const;
/**
* Return an InputAccessor that allows access to files in the
* input without copying it to the store. Also return a possibly
* unlocked input.
*/
std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store) const;
private:
std::pair<ref<InputAccessor>, Input> getAccessorUnchecked(ref<Store> store) const;
public:
Input applyOverrides(
std::optional<std::string> ref,
std::optional<Hash> rev) const;
@ -173,9 +184,7 @@ struct InputScheme
std::string_view contents,
std::optional<std::string> commitMsg) const;
virtual std::pair<StorePath, Input> fetch(ref<Store> store, const Input & input);
virtual std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store, const Input & input) const;
virtual std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store, const Input & input) const = 0;
/**
* Is this `InputScheme` part of an experimental feature?
@ -202,6 +211,14 @@ struct InputScheme
*/
virtual bool isLocked(const Input & input) const
{ return false; }
/**
* Check the locking attributes in `final` against
* `specified`. E.g. if `specified` has a `rev` attribute, then
* `final` must have the same `rev` attribute. Throw an exception
* if there is a mismatch.
*/
virtual void checkLocks(const Input & specified, const Input & final) const;
};
void registerInputScheme(std::shared_ptr<InputScheme> && fetcher);

2
src/libfetchers/git.cc
View File

@ -761,8 +761,6 @@ struct GitInputScheme : InputScheme
? getAccessorFromCommit(store, repoInfo, std::move(input))
: getAccessorFromWorkdir(store, repoInfo, std::move(input));
accessor->fingerprint = final.getFingerprint(store);
return {accessor, std::move(final)};
}

2
src/libfetchers/github.cc
View File

@ -275,8 +275,6 @@ struct GitArchiveInputScheme : InputScheme
accessor->setPathDisplay("«" + input.to_string() + "»");
accessor->fingerprint = input.getFingerprint(store);
return {accessor, input};
}

2
src/libfetchers/indirect.cc
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@ -97,7 +97,7 @@ struct IndirectInputScheme : InputScheme
return input;
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & input) override
std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store, const Input & input) const override
{
throw Error("indirect input '%s' cannot be fetched directly", input.to_string());
}

26
src/libfetchers/mercurial.cc
View File

@ -6,8 +6,8 @@
#include "tarfile.hh"
#include "store-api.hh"
#include "url-parts.hh"
#include "fs-input-accessor.hh"
#include "posix-source-accessor.hh"
#include "fetch-settings.hh"
#include <sys/time.h>
@ -161,9 +161,9 @@ struct MercurialInputScheme : InputScheme
return {isLocal, isLocal ? url.path : url.base};
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override
StorePath fetchToStore(ref<Store> store, Input & input) const
{
Input input(_input);
auto origRev = input.getRev();
auto name = input.getName();
@ -218,7 +218,7 @@ struct MercurialInputScheme : InputScheme
FileIngestionMethod::Recursive, HashAlgorithm::SHA256, {},
filter);
return {std::move(storePath), input};
return storePath;
}
}
@ -242,13 +242,12 @@ struct MercurialInputScheme : InputScheme
});
};
auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath)
-> std::pair<StorePath, Input>
auto makeResult = [&](const Attrs & infoAttrs, const StorePath & storePath) -> StorePath
{
assert(input.getRev());
assert(!_input.getRev() || _input.getRev() == input.getRev());
assert(!origRev || origRev == input.getRev());
input.attrs.insert_or_assign("revCount", getIntAttr(infoAttrs, "revCount"));
return {std::move(storePath), input};
return storePath;
};
if (input.getRev()) {
@ -329,7 +328,7 @@ struct MercurialInputScheme : InputScheme
{"revCount", (uint64_t) revCount},
});
if (!_input.getRev())
if (!origRev)
getCache()->add(
*store,
unlockedAttrs,
@ -347,6 +346,15 @@ struct MercurialInputScheme : InputScheme
return makeResult(infoAttrs, std::move(storePath));
}
std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store, const Input & _input) const override
{
Input input(_input);
auto storePath = fetchToStore(store, input);
return {makeStorePathAccessor(store, storePath), input};
}
bool isLocked(const Input & input) const override
{
return (bool) input.getRev();

6
src/libfetchers/path.cc
View File

@ -1,6 +1,8 @@
#include "fetchers.hh"
#include "store-api.hh"
#include "archive.hh"
#include "fs-input-accessor.hh"
#include "posix-source-accessor.hh"
namespace nix::fetchers {
@ -102,7 +104,7 @@ struct PathInputScheme : InputScheme
throw Error("cannot fetch input '%s' because it uses a relative path", input.to_string());
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override
std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store, const Input & _input) const override
{
Input input(_input);
std::string absPath;
@ -144,7 +146,7 @@ struct PathInputScheme : InputScheme
}
input.attrs.insert_or_assign("lastModified", uint64_t(mtime));
return {std::move(*storePath), input};
return {makeStorePathAccessor(store, *storePath), std::move(input)};
}
std::optional<std::string> getFingerprint(ref<Store> store, const Input & input) const override

2
src/nix/flake.cc
View File

@ -1053,7 +1053,7 @@ struct CmdFlakeArchive : FlakeCommand, MixJSON, MixDryRun
auto storePath =
dryRun
? (*inputNode)->lockedRef.input.computeStorePath(*store)
: (*inputNode)->lockedRef.input.fetch(store).first;
: (*inputNode)->lockedRef.input.fetchToStore(store).first;
if (json) {
auto& jsonObj3 = jsonObj2[inputName];
jsonObj3["path"] = store->printStorePath(storePath);

4
src/nix/registry.cc
View File

@ -188,7 +188,9 @@ struct CmdRegistryPin : RegistryCommand, EvalCommand
auto ref = parseFlakeRef(url);
auto lockedRef = parseFlakeRef(locked);
registry->remove(ref.input);
auto [tree, resolved] = lockedRef.resolve(store).input.fetch(store);
auto resolved = lockedRef.resolve(store).input.getAccessor(store).second;
if (!resolved.isLocked())
warn("flake '%s' is not locked", resolved.to_string());
fetchers::Attrs extraAttrs;
if (ref.subdir != "") extraAttrs["dir"] = ref.subdir;
registry->add(ref.input, resolved, extraAttrs);