forked from lix-project/lix
Lockfile handling in resolveFlake is fixed
This commit is contained in:
Nick Van den Broeck
parent
98f20dee41
commit
ef6ae61503
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@ -372,10 +372,58 @@ LockFile entryToLockFile(const LockFile::FlakeEntry & entry)
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return lockFile;
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}
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ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flakeRef,
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ShouldUpdateLockFile update, LockFile lockFile = {})
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LockFile::FlakeEntry dependenciesToFlakeEntry(const ResolvedFlake & resolvedFlake)
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{
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Flake flake = getFlake(state, flakeRef, update != DontUpdate);
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LockFile::FlakeEntry entry(resolvedFlake.flake.resolvedRef, resolvedFlake.flake.hash);
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for (auto & info : resolvedFlake.flakeDeps)
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entry.flakeEntries.insert_or_assign(info.first.to_string(), dependenciesToFlakeEntry(info.second));
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for (auto & nonFlake : resolvedFlake.nonFlakeDeps) {
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LockFile::NonFlakeEntry nonEntry(nonFlake.resolvedRef, nonFlake.hash);
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entry.nonFlakeEntries.insert_or_assign(nonFlake.alias, nonEntry);
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}
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return entry;
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}
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bool allowedToWrite (HandleLockFile handle)
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{
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if (handle == AllPure) return false;
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else if (handle == TopRefUsesRegistries) return false;
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else if (handle == UpdateLockFile) return true;
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else if (handle == UseUpdatedLockFile) return false;
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else if (handle == RecreateLockFile) return true;
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else if (handle == UseNewLockFile) return false;
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else assert(false);
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}
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bool recreateLockFile (HandleLockFile handle)
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{
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if (handle == AllPure) return false;
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else if (handle == TopRefUsesRegistries) return false;
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else if (handle == UpdateLockFile) return false;
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else if (handle == UseUpdatedLockFile) return false;
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else if (handle == RecreateLockFile) return true;
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else if (handle == UseNewLockFile) return true;
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else assert(false);
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}
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bool allowedToUseRegistries (HandleLockFile handle, bool isTopRef)
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{
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if (handle == AllPure) return false;
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else if (handle == TopRefUsesRegistries) return isTopRef;
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else if (handle == UpdateLockFile) return true;
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else if (handle == UseUpdatedLockFile) return true;
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else if (handle == RecreateLockFile) return true;
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else if (handle == UseNewLockFile) return true;
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else assert(false);
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}
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ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flakeRef,
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HandleLockFile handleLockFile, LockFile lockFile = {}, bool topRef = false)
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{
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Flake flake = getFlake(state, flakeRef, allowedToUseRegistries(handleLockFile, topRef));
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ResolvedFlake deps(flake);
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@ -388,23 +436,23 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
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throw Error("the content hash of flakeref %s doesn't match", i->second.ref.to_string());
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deps.nonFlakeDeps.push_back(nonFlake);
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} else {
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if (update == DontUpdate) throw Error("the lockfile requires updating nonflake dependency %s in DontUpdate mode", nonFlakeInfo.first);
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if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
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throw Error("the lockfile requires updating nonflake dependency %s in AllPure mode", nonFlakeInfo.first);
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deps.nonFlakeDeps.push_back(getNonFlake(state, nonFlakeInfo.second, nonFlakeInfo.first));
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}
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}
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for (auto newFlakeRef : flake.requires) {
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FlakeRef ref = newFlakeRef;
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LockFile newLockFile;
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auto i = lockFile.flakeEntries.find(newFlakeRef);
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if (i != lockFile.flakeEntries.end()) { // Propagate lockFile downwards if possible
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ResolvedFlake newResFlake = resolveFlakeFromLockFile(state, i->second.ref, update, entryToLockFile(i->second));
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ResolvedFlake newResFlake = resolveFlakeFromLockFile(state, i->second.ref, handleLockFile, entryToLockFile(i->second));
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if (newResFlake.flake.hash != i->second.contentHash)
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throw Error("the content hash of flakeref %s doesn't match", i->second.ref.to_string());
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deps.flakeDeps.push_back(newResFlake);
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deps.flakeDeps.insert_or_assign(newFlakeRef, newResFlake);
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} else {
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if (update == DontUpdate) throw Error("the lockfile requires updating flake dependency %s in DontUpdate mode", newFlakeRef.to_string());
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deps.flakeDeps.push_back(resolveFlakeFromLockFile(state, newFlakeRef, update));
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if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
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throw Error("the lockfile requires updating flake dependency %s in AllPure mode", newFlakeRef.to_string());
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deps.flakeDeps.insert_or_assign(newFlakeRef, resolveFlakeFromLockFile(state, newFlakeRef, handleLockFile));
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}
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}
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@ -414,54 +462,37 @@ ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flake
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/* Given a flake reference, recursively fetch it and its dependencies.
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FIXME: this should return a graph of flakes.
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*/
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ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, ShouldUpdateLockFile update)
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ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLockFile handleLockFile)
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{
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if (!std::get_if<FlakeRef::IsPath>(&topRef.data)) update = DontUpdate;
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Flake flake = getFlake(state, topRef, update != DontUpdate);
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Flake flake = getFlake(state, topRef, allowedToUseRegistries(handleLockFile, true));
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LockFile lockFile;
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if (update != RecreateLockFile) {
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if (!recreateLockFile (handleLockFile)) {
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// If recreateLockFile, start with an empty lockfile
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lockFile = readLockFile(flake.storePath + "/flake.lock"); // FIXME: symlink attack
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}
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return resolveFlakeFromLockFile(state, topRef, update, lockFile);
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ResolvedFlake resFlake = resolveFlakeFromLockFile(state, topRef, handleLockFile, lockFile, true);
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lockFile = entryToLockFile(dependenciesToFlakeEntry(resFlake));
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if (allowedToWrite(handleLockFile)) {
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if (auto refData = std::get_if<FlakeRef::IsPath>(&topRef.data)) {
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writeLockFile(lockFile, refData->path + (topRef.subdir == "" ? "" : "/" + topRef.subdir) + "/flake.lock");
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// Hack: Make sure that flake.lock is visible to Git, so it ends up in the Nix store.
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runProgram("git", true, { "-C", refData->path, "add",
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(topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock" });
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} else std::cout << "Cannot write lockfile because the FlakeRef isn't of the form IsPath." << std::endl;
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} else if (handleLockFile != AllPure && handleLockFile != TopRefUsesRegistries)
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std::cout << "Using updating lockfile without writing it to file" << std::endl;
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return resFlake;
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}
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LockFile::FlakeEntry dependenciesToFlakeEntry(const ResolvedFlake & resolvedFlake)
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void updateLockFile (EvalState & state, const FlakeUri & flakeUri, bool recreateLockFile)
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{
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LockFile::FlakeEntry entry(resolvedFlake.flake.resolvedRef, resolvedFlake.flake.hash);
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for (auto & newResFlake : resolvedFlake.flakeDeps)
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entry.flakeEntries.insert_or_assign(newResFlake.flake.originalRef, dependenciesToFlakeEntry(newResFlake));
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for (auto & nonFlake : resolvedFlake.nonFlakeDeps) {
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LockFile::NonFlakeEntry nonEntry(nonFlake.resolvedRef, nonFlake.hash);
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entry.nonFlakeEntries.insert_or_assign(nonFlake.alias, nonEntry);
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}
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return entry;
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}
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static LockFile makeLockFile(EvalState & evalState, FlakeRef & flakeRef, bool recreateLockFile)
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{
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ResolvedFlake resFlake = resolveFlake(evalState, flakeRef, recreateLockFile ? RecreateLockFile : UpdateLockFile);
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return entryToLockFile(dependenciesToFlakeEntry(resFlake));
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}
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void updateLockFile(EvalState & state, const FlakeUri & uri, bool recreateLockFile)
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{
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FlakeRef flakeRef = FlakeRef(uri);
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auto lockFile = makeLockFile(state, flakeRef, recreateLockFile);
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if (auto refData = std::get_if<FlakeRef::IsPath>(&flakeRef.data)) {
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writeLockFile(lockFile, refData->path + (flakeRef.subdir == "" ? "" : "/" + flakeRef.subdir) + "/flake.lock");
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// Hack: Make sure that flake.lock is visible to Git. Otherwise,
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// exportGit will fail to copy it to the Nix store.
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runProgram("git", true, { "-C", refData->path, "add",
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(flakeRef.subdir == "" ? "" : flakeRef.subdir + "/") + "flake.lock" });
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} else
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throw Error("flakeUri %s can't be updated because it is not a path", uri);
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FlakeRef flakeRef(flakeUri);
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resolveFlake(state, flakeRef, recreateLockFile ? RecreateLockFile : UpdateLockFile);
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}
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void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)
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@ -471,7 +502,8 @@ void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)
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state.mkAttrs(v, resFlake.flakeDeps.size() + resFlake.nonFlakeDeps.size() + 8);
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for (const ResolvedFlake newResFlake : resFlake.flakeDeps) {
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for (auto info : resFlake.flakeDeps) {
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const ResolvedFlake newResFlake = info.second;
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auto vFlake = state.allocAttr(v, newResFlake.flake.id);
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callFlake(state, newResFlake, *vFlake);
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}
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@ -512,16 +544,16 @@ void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)
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// Return the `provides` of the top flake, while assigning to `v` the provides
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// of the dependencies as well.
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void makeFlakeValue(EvalState & state, const FlakeRef & flakeRef, ShouldUpdateLockFile update, Value & v)
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void makeFlakeValue(EvalState & state, const FlakeRef & flakeRef, HandleLockFile handle, Value & v)
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{
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callFlake(state, resolveFlake(state, flakeRef, update), v);
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callFlake(state, resolveFlake(state, flakeRef, handle), v);
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}
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// This function is exposed to be used in nix files.
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static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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makeFlakeValue(state, state.forceStringNoCtx(*args[0], pos),
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evalSettings.pureEval ? DontUpdate : UpdateLockFile, v);
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evalSettings.pureEval ? AllPure : UseUpdatedLockFile, v);
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}
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static RegisterPrimOp r2("getFlake", 1, prim_getFlake);
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@ -36,16 +36,23 @@ struct LockFile
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};
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std::map<FlakeRef, FlakeEntry> flakeEntries;
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std::map<FlakeId, NonFlakeEntry> nonFlakeEntries;
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std::map<FlakeAlias, NonFlakeEntry> nonFlakeEntries;
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};
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typedef std::vector<std::shared_ptr<FlakeRegistry>> Registries;
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Path getUserRegistryPath();
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enum ShouldUpdateLockFile { DontUpdate, UpdateLockFile, RecreateLockFile};
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enum HandleLockFile
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{ AllPure // Everything is handled 100% purely
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, TopRefUsesRegistries // The top FlakeRef uses the registries, apart from that, everything happens 100% purely
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, UpdateLockFile // Update the existing lockfile and write it to file
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, UseUpdatedLockFile // `UpdateLockFile` without writing to file
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, RecreateLockFile // Recreate the lockfile from scratch and write it to file
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, UseNewLockFile // `RecreateLockFile` without writing to file
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};
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void makeFlakeValue(EvalState &, const FlakeRef &, ShouldUpdateLockFile, Value &);
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void makeFlakeValue(EvalState &, const FlakeRef &, HandleLockFile, Value &);
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std::shared_ptr<FlakeRegistry> readRegistry(const Path &);
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@ -98,12 +105,12 @@ Flake getFlake(EvalState &, const FlakeRef &, bool impureIsAllowed);
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struct ResolvedFlake
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{
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Flake flake;
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std::vector<ResolvedFlake> flakeDeps; // The flake dependencies
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std::map<FlakeRef, ResolvedFlake> flakeDeps; // The key in this map, is the originalRef as written in flake.nix
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std::vector<NonFlake> nonFlakeDeps;
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ResolvedFlake(const Flake & flake) : flake(flake) {}
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};
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ResolvedFlake resolveFlake(EvalState &, const FlakeRef &, ShouldUpdateLockFile);
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ResolvedFlake resolveFlake(EvalState &, const FlakeRef &, HandleLockFile);
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void updateLockFile(EvalState &, const FlakeUri &, bool recreateLockFile);
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@ -80,6 +80,10 @@ struct SourceExprCommand : virtual Args, StoreCommand, MixEvalArgs
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bool recreateLockFile = false;
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bool saveLockFile = true;
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bool noRegistries = false;
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ref<EvalState> getEvalState();
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std::vector<std::shared_ptr<Installable>> parseInstallables(
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@ -126,8 +126,8 @@ struct CmdFlakeDeps : FlakeCommand, MixJSON, StoreCommand, MixEvalArgs
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for (NonFlake & nonFlake : resFlake.nonFlakeDeps)
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printNonFlakeInfo(nonFlake, json);
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for (ResolvedFlake & newResFlake : resFlake.flakeDeps)
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todo.push(newResFlake);
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for (auto info : resFlake.flakeDeps)
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todo.push(info.second);
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}
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}
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};
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@ -26,6 +26,16 @@ SourceExprCommand::SourceExprCommand()
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.longName("recreate-lock-file")
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.description("recreate lock file from scratch")
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.set(&recreateLockFile, true);
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mkFlag()
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.longName("dont-save-lock-file")
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.description("save the newly generated lock file")
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.set(&saveLockFile, false);
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mkFlag()
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.longName("no-registries")
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.description("don't use flake registries")
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.set(&noRegistries, true);
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}
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ref<EvalState> SourceExprCommand::getEvalState()
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@ -158,10 +168,12 @@ struct InstallableFlake : InstallableValue
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Value * toValue(EvalState & state) override
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{
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auto vFlake = state.allocValue();
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if (std::get_if<FlakeRef::IsPath>(&flakeRef.data))
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updateLockFile(state, flakeRef.to_string(), cmd.recreateLockFile);
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makeFlakeValue(state, flakeRef, cmd.recreateLockFile ? RecreateLockFile : UpdateLockFile, *vFlake);
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HandleLockFile handle = cmd.noRegistries ? AllPure :
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cmd.recreateLockFile ?
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(cmd.saveLockFile ? RecreateLockFile : UseNewLockFile)
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: (cmd.saveLockFile ? UpdateLockFile : UseUpdatedLockFile);
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makeFlakeValue(state, flakeRef, handle, *vFlake);
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auto vProvides = (*vFlake->attrs->get(state.symbols.create("provides")))->value;
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@ -1,20 +0,0 @@
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with import <nix/config.nix>;
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rec {
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inherit shell;
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path = coreutils;
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system = "x86_64-linux";
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shared = builtins.getEnv "_NIX_TEST_SHARED";
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mkDerivation = args:
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derivation ({
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inherit system;
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builder = shell;
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args = ["-e" args.builder or (builtins.toFile "builder.sh" "if [ -e .attrs.sh ]; then source .attrs.sh; fi; eval \"$buildCommand\"")];
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PATH = path;
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} // removeAttrs args ["builder" "meta"])
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// { meta = args.meta or {}; };
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}
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@ -118,7 +118,7 @@ nix build -o $TEST_ROOT/result --flake-registry $registry flake1:
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[[ -e $TEST_ROOT/result/hello ]]
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# Building a flake with an unlocked dependency should fail in pure mode.
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(! nix build -o $TEST_ROOT/result --flake-registry $registry flake2:bar)
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(! nix eval "(builtins.getFlake "$flake2Dir")")
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# But should succeed in impure mode.
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nix build -o $TEST_ROOT/result --flake-registry $registry flake2:bar --impure
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@ -129,8 +129,8 @@ nix build -o $TEST_ROOT/result --flake-registry $registry $flake2Dir:bar
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git -C $flake2Dir commit flake.lock -m 'Add flake.lock'
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# Rerunning the build should not change the lockfile.
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#nix build -o $TEST_ROOT/result --flake-registry $registry $flake2:bar
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#[[ -z $(git -C $flake2 diff) ]]
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nix build -o $TEST_ROOT/result --flake-registry $registry $flake2Dir:bar
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[[ -z $(git -C $flake2Dir diff master) ]]
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# Now we should be able to build the flake in pure mode.
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nix build -o $TEST_ROOT/result --flake-registry $registry flake2:bar
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@ -140,3 +140,32 @@ nix build -o $TEST_ROOT/result file://$flake2Dir:bar
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# Test whether indirect dependencies work.
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nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:xyzzy
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# Add dependency to flake3
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rm $flake3Dir/flake.nix
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cat > $flake3Dir/flake.nix <<EOF
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{
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name = "flake3";
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epoch = 2019;
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requires = [ "flake1" "flake2" ];
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description = "Fnord";
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provides = deps: rec {
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packages.xyzzy = deps.flake2.provides.packages.bar;
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packages.sth = deps.flake1.provides.packages.foo;
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};
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}
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EOF
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git -C $flake3Dir add flake.nix
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git -C $flake3Dir commit -m 'Update flake.nix'
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# Check whether `nix build` works with an incomplete lockfile
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nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth
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# Check whether it saved the lockfile
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[[ ! (-z $(git -C $flake3Dir diff master)) ]]
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