mirror of
https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
684 lines
25 KiB
C++
684 lines
25 KiB
C++
#include "flake.hh"
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#include "lockfile.hh"
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#include "primops.hh"
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#include "eval-inline.hh"
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#include "store-api.hh"
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#include "fetchers/fetchers.hh"
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#include "finally.hh"
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namespace nix {
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using namespace flake;
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namespace flake {
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/* If 'allowLookup' is true, then resolve 'flakeRef' using the
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registries. */
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static FlakeRef maybeLookupFlake(
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ref<Store> store,
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const FlakeRef & flakeRef,
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bool allowLookup)
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{
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if (!flakeRef.input->isDirect()) {
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if (allowLookup)
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return flakeRef.resolve(store);
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else
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throw Error("'%s' is an indirect flake reference, but registry lookups are not allowed", flakeRef);
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} else
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return flakeRef;
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}
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typedef std::vector<std::pair<FlakeRef, FlakeRef>> FlakeCache;
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static FlakeRef lookupInFlakeCache(
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const FlakeCache & flakeCache,
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const FlakeRef & flakeRef)
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{
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// FIXME: inefficient.
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for (auto & i : flakeCache) {
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if (flakeRef == i.first) {
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debug("mapping '%s' to previously seen input '%s' -> '%s",
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flakeRef, i.first, i.second);
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return i.second;
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}
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}
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return flakeRef;
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}
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static std::pair<fetchers::Tree, FlakeRef> fetchOrSubstituteTree(
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EvalState & state,
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const FlakeRef & originalRef,
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std::optional<TreeInfo> treeInfo,
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bool allowLookup,
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FlakeCache & flakeCache)
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{
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/* The tree may already be in the Nix store, or it could be
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substituted (which is often faster than fetching from the
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original source). So check that. */
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if (treeInfo && originalRef.input->isDirect() && originalRef.input->isImmutable()) {
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try {
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auto storePath = treeInfo->computeStorePath(*state.store);
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state.store->ensurePath(storePath);
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debug("using substituted/cached input '%s' in '%s'",
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originalRef, state.store->printStorePath(storePath));
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auto actualPath = state.store->toRealPath(storePath);
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if (state.allowedPaths)
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state.allowedPaths->insert(actualPath);
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return {
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Tree {
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.actualPath = actualPath,
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.storePath = std::move(storePath),
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.info = *treeInfo,
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},
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originalRef
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};
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} catch (Error & e) {
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debug("substitution of input '%s' failed: %s", originalRef, e.what());
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}
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}
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auto resolvedRef = lookupInFlakeCache(flakeCache,
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maybeLookupFlake(state.store,
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lookupInFlakeCache(flakeCache, originalRef), allowLookup));
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auto [tree, lockedRef] = resolvedRef.fetchTree(state.store);
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debug("got tree '%s' from '%s'",
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state.store->printStorePath(tree.storePath), lockedRef);
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flakeCache.push_back({originalRef, lockedRef});
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flakeCache.push_back({resolvedRef, lockedRef});
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if (state.allowedPaths)
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state.allowedPaths->insert(tree.actualPath);
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if (treeInfo)
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assert(tree.storePath == treeInfo->computeStorePath(*state.store));
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return {std::move(tree), lockedRef};
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}
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static void expectType(EvalState & state, ValueType type,
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Value & value, const Pos & pos)
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{
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if (value.type == tThunk && value.isTrivial())
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state.forceValue(value, pos);
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if (value.type != type)
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throw Error("expected %s but got %s at %s",
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showType(type), showType(value.type), pos);
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}
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static std::map<FlakeId, FlakeInput> parseFlakeInputs(
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EvalState & state, Value * value, const Pos & pos);
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static FlakeInput parseFlakeInput(EvalState & state,
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const std::string & inputName, Value * value, const Pos & pos)
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{
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expectType(state, tAttrs, *value, pos);
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FlakeInput input {
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.ref = FlakeRef::fromAttrs({{"type", "indirect"}, {"id", inputName}})
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};
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auto sInputs = state.symbols.create("inputs");
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auto sUrl = state.symbols.create("url");
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auto sUri = state.symbols.create("uri"); // FIXME: remove soon
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auto sFlake = state.symbols.create("flake");
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auto sFollows = state.symbols.create("follows");
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fetchers::Input::Attrs attrs;
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std::optional<std::string> url;
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for (Attr attr : *(value->attrs)) {
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try {
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if (attr.name == sUrl || attr.name == sUri) {
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expectType(state, tString, *attr.value, *attr.pos);
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url = attr.value->string.s;
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attrs.emplace("url", *url);
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} else if (attr.name == sFlake) {
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expectType(state, tBool, *attr.value, *attr.pos);
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input.isFlake = attr.value->boolean;
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} else if (attr.name == sInputs) {
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input.overrides = parseFlakeInputs(state, attr.value, *attr.pos);
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} else if (attr.name == sFollows) {
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expectType(state, tString, *attr.value, *attr.pos);
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input.follows = parseInputPath(attr.value->string.s);
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} else {
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state.forceValue(*attr.value);
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if (attr.value->type == tString)
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attrs.emplace(attr.name, attr.value->string.s);
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else
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throw TypeError("flake input attribute '%s' is %s while a string is expected",
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attr.name, showType(*attr.value));
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}
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} catch (Error & e) {
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e.addPrefix(fmt("in flake attribute '%s' at '%s':\n", attr.name, *attr.pos));
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throw;
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}
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}
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if (attrs.count("type"))
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try {
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input.ref = FlakeRef::fromAttrs(attrs);
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} catch (Error & e) {
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e.addPrefix(fmt("in flake input at '%s':\n", pos));
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throw;
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}
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else {
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attrs.erase("url");
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if (!attrs.empty())
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throw Error("unexpected flake input attribute '%s', at %s", attrs.begin()->first, pos);
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if (url)
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input.ref = parseFlakeRef(*url);
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}
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return input;
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}
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static std::map<FlakeId, FlakeInput> parseFlakeInputs(
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EvalState & state, Value * value, const Pos & pos)
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{
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std::map<FlakeId, FlakeInput> inputs;
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expectType(state, tAttrs, *value, pos);
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for (Attr & inputAttr : *(*value).attrs) {
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inputs.emplace(inputAttr.name,
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parseFlakeInput(state,
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inputAttr.name,
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inputAttr.value,
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*inputAttr.pos));
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}
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return inputs;
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}
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static Flake getFlake(
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EvalState & state,
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const FlakeRef & originalRef,
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std::optional<TreeInfo> treeInfo,
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bool allowLookup,
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FlakeCache & flakeCache)
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{
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auto [sourceInfo, lockedRef] = fetchOrSubstituteTree(
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state, originalRef, treeInfo, allowLookup, flakeCache);
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// Guard against symlink attacks.
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auto flakeFile = canonPath(sourceInfo.actualPath + "/" + lockedRef.subdir + "/flake.nix");
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if (!isInDir(flakeFile, sourceInfo.actualPath))
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throw Error("'flake.nix' file of flake '%s' escapes from '%s'",
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lockedRef, state.store->printStorePath(sourceInfo.storePath));
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Flake flake {
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.originalRef = originalRef,
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.lockedRef = lockedRef,
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.sourceInfo = std::make_shared<fetchers::Tree>(std::move(sourceInfo))
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};
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if (!pathExists(flakeFile))
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throw Error("source tree referenced by '%s' does not contain a '%s/flake.nix' file", lockedRef, lockedRef.subdir);
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Value vInfo;
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state.evalFile(flakeFile, vInfo, true); // FIXME: symlink attack
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expectType(state, tAttrs, vInfo, Pos(state.symbols.create(flakeFile), 0, 0));
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auto sEdition = state.symbols.create("edition");
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auto sEpoch = state.symbols.create("epoch"); // FIXME: remove soon
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auto edition = vInfo.attrs->get(sEdition);
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if (!edition)
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edition = vInfo.attrs->get(sEpoch);
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if (edition) {
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expectType(state, tInt, *edition->value, *edition->pos);
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flake.edition = edition->value->integer;
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if (flake.edition > 201909)
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throw Error("flake '%s' requires unsupported edition %d; please upgrade Nix", lockedRef, flake.edition);
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if (flake.edition < 201909)
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throw Error("flake '%s' has illegal edition %d", lockedRef, flake.edition);
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} else
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throw Error("flake '%s' lacks attribute 'edition'", lockedRef);
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if (auto description = vInfo.attrs->get(state.sDescription)) {
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expectType(state, tString, *description->value, *description->pos);
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flake.description = description->value->string.s;
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}
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auto sInputs = state.symbols.create("inputs");
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if (auto inputs = vInfo.attrs->get(sInputs))
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flake.inputs = parseFlakeInputs(state, inputs->value, *inputs->pos);
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auto sOutputs = state.symbols.create("outputs");
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if (auto outputs = vInfo.attrs->get(sOutputs)) {
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expectType(state, tLambda, *outputs->value, *outputs->pos);
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flake.vOutputs = outputs->value;
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if (flake.vOutputs->lambda.fun->matchAttrs) {
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for (auto & formal : flake.vOutputs->lambda.fun->formals->formals) {
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if (formal.name != state.sSelf)
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flake.inputs.emplace(formal.name, FlakeInput {
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.ref = parseFlakeRef(formal.name)
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});
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}
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}
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} else
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throw Error("flake '%s' lacks attribute 'outputs'", lockedRef);
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for (auto & attr : *vInfo.attrs) {
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if (attr.name != sEdition &&
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attr.name != sEpoch &&
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attr.name != state.sDescription &&
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attr.name != sInputs &&
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attr.name != sOutputs)
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throw Error("flake '%s' has an unsupported attribute '%s', at %s",
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lockedRef, attr.name, *attr.pos);
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}
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return flake;
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}
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Flake getFlake(EvalState & state, const FlakeRef & originalRef, bool allowLookup)
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{
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FlakeCache flakeCache;
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return getFlake(state, originalRef, {}, allowLookup, flakeCache);
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}
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static void flattenLockFile(
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const LockedInputs & inputs,
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const InputPath & prefix,
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std::map<InputPath, const LockedInput *> & res)
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{
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for (auto &[id, input] : inputs.inputs) {
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auto inputPath(prefix);
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inputPath.push_back(id);
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res.emplace(inputPath, &input);
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flattenLockFile(input, inputPath, res);
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}
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}
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static std::string diffLockFiles(const LockedInputs & oldLocks, const LockedInputs & newLocks)
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{
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std::map<InputPath, const LockedInput *> oldFlat, newFlat;
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flattenLockFile(oldLocks, {}, oldFlat);
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flattenLockFile(newLocks, {}, newFlat);
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auto i = oldFlat.begin();
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auto j = newFlat.begin();
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std::string res;
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while (i != oldFlat.end() || j != newFlat.end()) {
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if (j != newFlat.end() && (i == oldFlat.end() || i->first > j->first)) {
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res += fmt("* Added '%s': '%s'\n", concatStringsSep("/", j->first), j->second->lockedRef);
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++j;
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} else if (i != oldFlat.end() && (j == newFlat.end() || i->first < j->first)) {
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res += fmt("* Removed '%s'\n", concatStringsSep("/", i->first));
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++i;
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} else {
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if (!(i->second->lockedRef == j->second->lockedRef)) {
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assert(i->second->lockedRef.to_string() != j->second->lockedRef.to_string());
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res += fmt("* Updated '%s': '%s' -> '%s'\n",
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concatStringsSep("/", i->first),
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i->second->lockedRef,
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j->second->lockedRef);
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}
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++i;
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++j;
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}
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}
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return res;
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}
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/* Compute an in-memory lock file for the specified top-level flake,
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and optionally write it to file, it the flake is writable. */
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LockedFlake lockFlake(
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EvalState & state,
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const FlakeRef & topRef,
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const LockFlags & lockFlags)
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{
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settings.requireExperimentalFeature("flakes");
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FlakeCache flakeCache;
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auto flake = getFlake(state, topRef, {}, lockFlags.useRegistries, flakeCache);
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LockFile oldLockFile;
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if (!lockFlags.recreateLockFile) {
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// FIXME: symlink attack
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oldLockFile = LockFile::read(
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flake.sourceInfo->actualPath + "/" + flake.lockedRef.subdir + "/flake.lock");
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}
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debug("old lock file: %s", oldLockFile);
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LockFile newLockFile, prevLockFile;
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std::vector<InputPath> prevUnresolved;
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// FIXME: check whether all overrides are used.
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std::map<InputPath, FlakeInput> overrides;
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for (auto & i : lockFlags.inputOverrides)
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overrides.insert_or_assign(i.first, FlakeInput { .ref = i.second });
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/* Compute the new lock file. This is dones as a fixpoint
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iteration: we repeat until the new lock file no longer changes
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and there are no unresolved "follows" inputs. */
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while (true) {
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std::vector<InputPath> unresolved;
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/* Recurse into the flake inputs. */
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std::function<void(
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const FlakeInputs & flakeInputs,
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const LockedInputs & oldLocks,
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LockedInputs & newLocks,
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const InputPath & inputPathPrefix)>
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updateLocks;
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std::vector<FlakeRef> parents;
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updateLocks = [&](
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const FlakeInputs & flakeInputs,
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const LockedInputs & oldLocks,
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LockedInputs & newLocks,
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const InputPath & inputPathPrefix)
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{
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/* Get the overrides (i.e. attributes of the form
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'inputs.nixops.inputs.nixpkgs.url = ...'). */
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for (auto & [id, input] : flake.inputs) {
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for (auto & [idOverride, inputOverride] : input.overrides) {
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auto inputPath(inputPathPrefix);
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inputPath.push_back(id);
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inputPath.push_back(idOverride);
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overrides.insert_or_assign(inputPath, inputOverride);
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}
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}
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/* Go over the flake inputs, resolve/fetch them if
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necessary (i.e. if they're new or the flakeref changed
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from what's in the lock file). */
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for (auto & [id, input2] : flakeInputs) {
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auto inputPath(inputPathPrefix);
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inputPath.push_back(id);
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auto inputPathS = concatStringsSep("/", inputPath);
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/* Do we have an override for this input from one of
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the ancestors? */
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auto i = overrides.find(inputPath);
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bool hasOverride = i != overrides.end();
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auto & input = hasOverride ? i->second : input2;
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if (input.follows) {
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/* This is a "follows" input
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(i.e. 'inputs.nixpkgs.follows =
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"dwarffs/nixpkgs"). Resolve the source and copy
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its inputs. Note that the source is normally
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relative to the current node of the lock file
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(e.g. "dwarffs/nixpkgs" refers to the nixpkgs
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input of the dwarffs input of the root flake),
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but if it's from an override, it's relative to
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the *root* of the lock file. */
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auto follows = (hasOverride ? newLockFile : newLocks).findInput(*input.follows);
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if (follows)
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newLocks.inputs.insert_or_assign(id, **follows);
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else
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/* We haven't processed the source of the
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"follows" yet (e.g. "dwarffs/nixpkgs"). So
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we'll need another round of the fixpoint
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iteration. */
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unresolved.push_back(inputPath);
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continue;
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}
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/* Do we have an entry in the existing lock file? And
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we don't have a --update-input flag for this
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input? */
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auto oldLock =
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lockFlags.inputUpdates.count(inputPath)
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? oldLocks.inputs.end()
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: oldLocks.inputs.find(id);
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if (oldLock != oldLocks.inputs.end() && oldLock->second.originalRef == input.ref && !hasOverride) {
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/* Copy the input from the old lock file if its
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flakeref didn't change and there is no override
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from a higher level flake. */
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newLocks.inputs.insert_or_assign(id, oldLock->second);
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/* If we have an --update-input flag for an input
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of this input, then we must fetch the flake to
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to update it. */
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auto lb = lockFlags.inputUpdates.lower_bound(inputPath);
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auto hasChildUpdate =
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lb != lockFlags.inputUpdates.end()
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&& lb->size() > inputPath.size()
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&& std::equal(inputPath.begin(), inputPath.end(), lb->begin());
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if (hasChildUpdate) {
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auto inputFlake = getFlake(
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state, oldLock->second.lockedRef, oldLock->second.info, false, flakeCache);
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updateLocks(inputFlake.inputs,
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(const LockedInputs &) oldLock->second,
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newLocks.inputs.find(id)->second,
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inputPath);
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} else {
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/* No need to fetch this flake, we can be
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lazy. However there may be new overrides on
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the inputs of this flake, so we need to
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check those. */
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FlakeInputs fakeInputs;
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for (auto & i : oldLock->second.inputs)
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fakeInputs.emplace(i.first, FlakeInput { .ref = i.second.originalRef });
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updateLocks(fakeInputs,
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oldLock->second,
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newLocks.inputs.find(id)->second,
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inputPath);
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}
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} else {
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/* We need to update/create a new lock file
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entry. So fetch the flake/non-flake. */
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if (!lockFlags.allowMutable && !input.ref.input->isImmutable())
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throw Error("cannot update flake input '%s' in pure mode", inputPathS);
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|
|
|
if (input.isFlake) {
|
|
auto inputFlake = getFlake(state, input.ref, {}, lockFlags.useRegistries, flakeCache);
|
|
|
|
newLocks.inputs.insert_or_assign(id,
|
|
LockedInput(inputFlake.lockedRef, inputFlake.originalRef, inputFlake.sourceInfo->info));
|
|
|
|
/* Recursively process the inputs of this
|
|
flake. Also, unless we already have this
|
|
flake in the top-level lock file, use this
|
|
flake's own lock file. */
|
|
|
|
/* Guard against circular flake imports. */
|
|
for (auto & parent : parents)
|
|
if (parent == input.ref)
|
|
throw Error("found circular import of flake '%s'", parent);
|
|
parents.push_back(input.ref);
|
|
Finally cleanup([&]() { parents.pop_back(); });
|
|
|
|
updateLocks(inputFlake.inputs,
|
|
oldLock != oldLocks.inputs.end()
|
|
? (const LockedInputs &) oldLock->second
|
|
: LockFile::read(
|
|
inputFlake.sourceInfo->actualPath + "/" + inputFlake.lockedRef.subdir + "/flake.lock"),
|
|
newLocks.inputs.find(id)->second,
|
|
inputPath);
|
|
}
|
|
|
|
else {
|
|
auto [sourceInfo, lockedRef] = fetchOrSubstituteTree(
|
|
state, input.ref, {}, lockFlags.useRegistries, flakeCache);
|
|
newLocks.inputs.insert_or_assign(id,
|
|
LockedInput(lockedRef, input.ref, sourceInfo.info, false));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
updateLocks(flake.inputs, oldLockFile, newLockFile, {});
|
|
|
|
/* Check if there is a cycle in the "follows" inputs. */
|
|
if (!unresolved.empty() && unresolved == prevUnresolved) {
|
|
std::vector<std::string> ss;
|
|
for (auto & i : unresolved)
|
|
ss.push_back(concatStringsSep("/", i));
|
|
throw Error("cycle or missing input detected in flake inputs: %s", concatStringsSep(", ", ss));
|
|
}
|
|
|
|
std::swap(unresolved, prevUnresolved);
|
|
|
|
/* Done with the fixpoint iteration? */
|
|
if (newLockFile == prevLockFile) break;
|
|
prevLockFile = newLockFile;
|
|
};
|
|
|
|
debug("new lock file: %s", newLockFile);
|
|
|
|
/* Check whether we need to / can write the new lock file. */
|
|
if (!(newLockFile == oldLockFile)) {
|
|
|
|
auto diff = diffLockFiles(oldLockFile, newLockFile);
|
|
|
|
if (!(oldLockFile == LockFile()))
|
|
printInfo("inputs of flake '%s' changed:\n%s", topRef, chomp(diff));
|
|
|
|
if (lockFlags.writeLockFile) {
|
|
if (auto sourcePath = topRef.input->getSourcePath()) {
|
|
if (!newLockFile.isImmutable()) {
|
|
if (settings.warnDirty)
|
|
warn("will not write lock file of flake '%s' because it has a mutable input", topRef);
|
|
} else {
|
|
if (!lockFlags.updateLockFile)
|
|
throw Error("flake '%s' requires lock file changes but they're not allowed due to '--no-update-lock-file'", topRef);
|
|
|
|
auto relPath = (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock";
|
|
|
|
auto path = *sourcePath + "/" + relPath;
|
|
|
|
bool lockFileExists = pathExists(path);
|
|
|
|
if (lockFileExists)
|
|
warn("updating lock file '%s'", path);
|
|
else
|
|
warn("creating lock file '%s'", path);
|
|
|
|
newLockFile.write(path);
|
|
|
|
topRef.input->markChangedFile(
|
|
(topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock",
|
|
lockFlags.commitLockFile
|
|
? std::optional<std::string>(fmt("%s: %s\n\nFlake input changes:\n\n%s",
|
|
relPath, lockFileExists ? "Update" : "Add", diff))
|
|
: std::nullopt);
|
|
|
|
/* Rewriting the lockfile changed the top-level
|
|
repo, so we should re-read it. FIXME: we could
|
|
also just clear the 'rev' field... */
|
|
auto prevLockedRef = flake.lockedRef;
|
|
FlakeCache dummyCache;
|
|
flake = getFlake(state, topRef, {}, lockFlags.useRegistries, dummyCache);
|
|
|
|
if (lockFlags.commitLockFile &&
|
|
flake.lockedRef.input->getRev() &&
|
|
prevLockedRef.input->getRev() != flake.lockedRef.input->getRev())
|
|
warn("committed new revision '%s'", flake.lockedRef.input->getRev()->gitRev());
|
|
|
|
/* Make sure that we picked up the change,
|
|
i.e. the tree should usually be dirty
|
|
now. Corner case: we could have reverted from a
|
|
dirty to a clean tree! */
|
|
if (flake.lockedRef.input == prevLockedRef.input
|
|
&& !flake.lockedRef.input->isImmutable())
|
|
throw Error("'%s' did not change after I updated its 'flake.lock' file; is 'flake.lock' under version control?", flake.originalRef);
|
|
}
|
|
} else
|
|
throw Error("cannot write modified lock file of flake '%s' (use '--no-write-lock-file' to ignore)", topRef);
|
|
} else
|
|
warn("not writing modified lock file of flake '%s'", topRef);
|
|
}
|
|
|
|
return LockedFlake { .flake = std::move(flake), .lockFile = std::move(newLockFile) };
|
|
}
|
|
|
|
void callFlake(EvalState & state,
|
|
const Flake & flake,
|
|
const LockedInputs & lockedInputs,
|
|
Value & vRes)
|
|
{
|
|
auto vCallFlake = state.allocValue();
|
|
auto vLocks = state.allocValue();
|
|
auto vRootSrc = state.allocValue();
|
|
auto vRootSubdir = state.allocValue();
|
|
auto vTmp1 = state.allocValue();
|
|
auto vTmp2 = state.allocValue();
|
|
|
|
mkString(*vLocks, lockedInputs.to_string());
|
|
|
|
emitTreeAttrs(state, *flake.sourceInfo, flake.lockedRef.input, *vRootSrc);
|
|
|
|
mkString(*vRootSubdir, flake.lockedRef.subdir);
|
|
|
|
state.evalFile(canonPath(settings.nixDataDir + "/nix/corepkgs/call-flake.nix", true), *vCallFlake);
|
|
state.callFunction(*vCallFlake, *vLocks, *vTmp1, noPos);
|
|
state.callFunction(*vTmp1, *vRootSrc, *vTmp2, noPos);
|
|
state.callFunction(*vTmp2, *vRootSubdir, vRes, noPos);
|
|
}
|
|
|
|
void callFlake(EvalState & state,
|
|
const LockedFlake & lockedFlake,
|
|
Value & v)
|
|
{
|
|
callFlake(state, lockedFlake.flake, lockedFlake.lockFile, v);
|
|
}
|
|
|
|
static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
|
|
{
|
|
callFlake(state,
|
|
lockFlake(state, parseFlakeRef(state.forceStringNoCtx(*args[0], pos)),
|
|
LockFlags {
|
|
.updateLockFile = false,
|
|
.useRegistries = !evalSettings.pureEval,
|
|
.allowMutable = !evalSettings.pureEval,
|
|
}),
|
|
v);
|
|
}
|
|
|
|
static RegisterPrimOp r2("getFlake", 1, prim_getFlake);
|
|
|
|
}
|
|
|
|
Fingerprint LockedFlake::getFingerprint() const
|
|
{
|
|
// FIXME: as an optimization, if the flake contains a lock file
|
|
// and we haven't changed it, then it's sufficient to use
|
|
// flake.sourceInfo.storePath for the fingerprint.
|
|
return hashString(htSHA256,
|
|
fmt("%s;%d;%d;%s",
|
|
flake.sourceInfo->storePath.to_string(),
|
|
flake.sourceInfo->info.revCount.value_or(0),
|
|
flake.sourceInfo->info.lastModified.value_or(0),
|
|
lockFile));
|
|
}
|
|
|
|
Flake::~Flake() { }
|
|
|
|
}
|