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Turn flake inputs into an attrset

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Instead of a list, inputs are now an attrset like

  inputs = {
    nixpkgs.uri = github:NixOS/nixpkgs;
  };

If 'uri' is omitted, than the flake is a lookup in the flake registry, e.g.

  inputs = {
    nixpkgs = {};
  };

but in that case, you can also just omit the input altogether and
specify it as an argument to the 'outputs' function, as in

  outputs = { self, nixpkgs }: ...

This also gets rid of 'nonFlakeInputs', which are now just a special
kind of input that have a 'flake = false' attribute, e.g.

  inputs = {
    someRepo = {
      uri = github:example/repo;
      flake = false;
    };
  };
This commit is contained in:
Eelco Dolstra 2019-08-30 16:27:51 +02:00
parent 0588d72286
commit 30ccf4e52d
7 changed files with 136 additions and 220 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

167
src/libexpr/flake/flake.cc
View file

@ -248,22 +248,28 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
flake.description = state.forceStringNoCtx(*(**description).value, *(**description).pos);
auto sInputs = state.symbols.create("inputs");
auto sUri = state.symbols.create("uri");
auto sFlake = state.symbols.create("flake");
if (auto inputs = vInfo.attrs->get(sInputs)) {
state.forceList(*(**inputs).value, *(**inputs).pos);
for (unsigned int n = 0; n < (**inputs).value->listSize(); ++n)
flake.inputs.push_back(FlakeRef(state.forceStringNoCtx(
*(**inputs).value->listElems()[n], *(**inputs).pos)));
}
if (std::optional<Attr *> inputs = vInfo.attrs->get(sInputs)) {
state.forceAttrs(*(**inputs).value, *(**inputs).pos);
auto sNonFlakeInputs = state.symbols.create("nonFlakeInputs");
for (Attr inputAttr : *(*(**inputs).value).attrs) {
state.forceAttrs(*inputAttr.value, *inputAttr.pos);
if (std::optional<Attr *> nonFlakeInputs = vInfo.attrs->get(sNonFlakeInputs)) {
state.forceAttrs(*(**nonFlakeInputs).value, *(**nonFlakeInputs).pos);
for (Attr attr : *(*(**nonFlakeInputs).value).attrs) {
std::string myNonFlakeUri = state.forceStringNoCtx(*attr.value, *attr.pos);
FlakeRef nonFlakeRef = FlakeRef(myNonFlakeUri);
flake.nonFlakeInputs.insert_or_assign(attr.name, nonFlakeRef);
FlakeInput input(FlakeRef(inputAttr.name));
for (Attr attr : *(inputAttr.value->attrs)) {
if (attr.name == sUri) {
input.ref = state.forceStringNoCtx(*attr.value, *attr.pos);
} else if (attr.name == sFlake) {
input.isFlake = state.forceBool(*attr.value, *attr.pos);
} else
throw Error("flake input '%s' has an unsupported attribute '%s', at %s",
inputAttr.name, attr.name, *attr.pos);
}
flake.inputs.emplace(inputAttr.name, input);
}
}
@ -275,9 +281,8 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
if (flake.vOutputs->lambda.fun->matchAttrs) {
for (auto & formal : flake.vOutputs->lambda.fun->formals->formals) {
if (formal.name != state.sSelf) {
flake.inputs.push_back(FlakeRef(formal.name));
}
if (formal.name != state.sSelf)
flake.inputs.emplace(formal.name, FlakeInput(FlakeRef(formal.name)));
}
}
@ -290,7 +295,6 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
attr.name != state.sName &&
attr.name != state.sDescription &&
attr.name != sInputs &&
attr.name != sNonFlakeInputs &&
attr.name != sOutputs)
throw Error("flake '%s' has an unsupported attribute '%s', at %s",
flakeRef, attr.name, *attr.pos);
@ -299,21 +303,19 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
return flake;
}
NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef)
static SourceInfo getNonFlake(EvalState & state, const FlakeRef & flakeRef)
{
auto sourceInfo = fetchFlake(state, flakeRef);
debug("got non-flake source '%s' with flakeref %s", sourceInfo.storePath, sourceInfo.resolvedRef.to_string());
FlakeRef resolvedRef = sourceInfo.resolvedRef;
NonFlake nonFlake(flakeRef, sourceInfo);
state.store->assertStorePath(nonFlake.sourceInfo.storePath);
state.store->assertStorePath(sourceInfo.storePath);
if (state.allowedPaths)
state.allowedPaths->insert(nonFlake.sourceInfo.storePath);
state.allowedPaths->insert(sourceInfo.storePath);
return nonFlake;
return sourceInfo;
}
bool allowedToWrite(HandleLockFile handle)
@ -346,46 +348,33 @@ bool allowedToUseRegistries(HandleLockFile handle, bool isTopRef)
Note that this is lazy: we only recursively fetch inputs that are
not in the lockfile yet. */
static std::pair<Flake, FlakeInput> updateLocks(
static std::pair<Flake, LockedInput> updateLocks(
EvalState & state,
const Flake & flake,
HandleLockFile handleLockFile,
const FlakeInputs & oldEntry,
const LockedInputs & oldEntry,
bool topRef)
{
FlakeInput newEntry(
flake.id,
LockedInput newEntry(
flake.sourceInfo.resolvedRef,
flake.sourceInfo.narHash);
for (auto & input : flake.nonFlakeInputs) {
auto & id = input.first;
auto & ref = input.second;
auto i = oldEntry.nonFlakeInputs.find(id);
if (i != oldEntry.nonFlakeInputs.end()) {
newEntry.nonFlakeInputs.insert_or_assign(i->first, i->second);
for (auto & [id, input] : flake.inputs) {
auto i = oldEntry.inputs.find(id);
if (i != oldEntry.inputs.end()) {
newEntry.inputs.insert_or_assign(id, i->second);
} else {
if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
throw Error("cannot update non-flake dependency '%s' in pure mode", id);
auto nonFlake = getNonFlake(state, maybeLookupFlake(state, ref, allowedToUseRegistries(handleLockFile, false)));
newEntry.nonFlakeInputs.insert_or_assign(id,
NonFlakeInput(
nonFlake.sourceInfo.resolvedRef,
nonFlake.sourceInfo.narHash));
}
}
for (auto & inputRef : flake.inputs) {
auto i = oldEntry.flakeInputs.find(inputRef);
if (i != oldEntry.flakeInputs.end()) {
newEntry.flakeInputs.insert_or_assign(inputRef, i->second);
} else {
if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
throw Error("cannot update flake dependency '%s' in pure mode", inputRef);
newEntry.flakeInputs.insert_or_assign(inputRef,
updateLocks(state,
getFlake(state, maybeLookupFlake(state, inputRef, allowedToUseRegistries(handleLockFile, false))),
handleLockFile, {}, false).second);
throw Error("cannot update flake input '%s' in pure mode", id);
if (input.isFlake)
newEntry.inputs.insert_or_assign(id,
updateLocks(state,
getFlake(state, maybeLookupFlake(state, input.ref, allowedToUseRegistries(handleLockFile, false))),
handleLockFile, {}, false).second);
else {
auto sourceInfo = getNonFlake(state, maybeLookupFlake(state, input.ref, allowedToUseRegistries(handleLockFile, false)));
newEntry.inputs.insert_or_assign(id, LockedInput(sourceInfo.resolvedRef, sourceInfo.narHash));
}
}
}
@ -462,81 +451,69 @@ static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo
std::put_time(std::gmtime(&*sourceInfo.lastModified), "%Y%m%d%H%M%S")));
}
struct LazyInput
{
bool isFlake;
LockedInput lockedInput;
};
/* Helper primop to make callFlake (below) fetch/call its inputs
lazily. Note that this primop cannot be called by user code since
it doesn't appear in 'builtins'. */
static void prim_callFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
auto lazyFlake = (FlakeInput *) args[0]->attrs;
auto lazyInput = (LazyInput *) args[0]->attrs;
assert(lazyFlake->ref.isImmutable());
assert(lazyInput->lockedInput.ref.isImmutable());
auto flake = getFlake(state, lazyFlake->ref);
if (lazyInput->isFlake) {
auto flake = getFlake(state, lazyInput->lockedInput.ref);
if (flake.sourceInfo.narHash != lazyFlake->narHash)
throw Error("the content hash of flake '%s' doesn't match the hash recorded in the referring lockfile", flake.sourceInfo.resolvedRef);
if (flake.sourceInfo.narHash != lazyInput->lockedInput.narHash)
throw Error("the content hash of flake '%s' doesn't match the hash recorded in the referring lockfile", flake.sourceInfo.resolvedRef);
callFlake(state, flake, *lazyFlake, v);
}
callFlake(state, flake, lazyInput->lockedInput, v);
} else {
auto sourceInfo = getNonFlake(state, lazyInput->lockedInput.ref);
static void prim_callNonFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
auto lazyNonFlake = (NonFlakeInput *) args[0]->attrs;
if (sourceInfo.narHash != lazyInput->lockedInput.narHash)
throw Error("the content hash of repository '%s' doesn't match the hash recorded in the referring lockfile", sourceInfo.resolvedRef);
assert(lazyNonFlake->ref.isImmutable());
state.mkAttrs(v, 8);
auto nonFlake = getNonFlake(state, lazyNonFlake->ref);
assert(state.store->isValidPath(sourceInfo.storePath));
if (nonFlake.sourceInfo.narHash != lazyNonFlake->narHash)
throw Error("the content hash of repository '%s' doesn't match the hash recorded in the referring lockfile", nonFlake.sourceInfo.resolvedRef);
mkString(*state.allocAttr(v, state.sOutPath),
sourceInfo.storePath, {sourceInfo.storePath});
state.mkAttrs(v, 8);
assert(state.store->isValidPath(nonFlake.sourceInfo.storePath));
mkString(*state.allocAttr(v, state.sOutPath),
nonFlake.sourceInfo.storePath, {nonFlake.sourceInfo.storePath});
emitSourceInfoAttrs(state, nonFlake.sourceInfo, v);
emitSourceInfoAttrs(state, sourceInfo, v);
}
}
void callFlake(EvalState & state,
const Flake & flake,
const FlakeInputs & inputs,
const LockedInputs & lockedInputs,
Value & vRes)
{
auto & vInputs = *state.allocValue();
state.mkAttrs(vInputs,
inputs.flakeInputs.size() +
inputs.nonFlakeInputs.size() + 1);
state.mkAttrs(vInputs, flake.inputs.size() + 1);
for (auto & dep : inputs.flakeInputs) {
auto vFlake = state.allocAttr(vInputs, dep.second.id);
for (auto & [inputId, input] : flake.inputs) {
auto vFlake = state.allocAttr(vInputs, inputId);
auto vPrimOp = state.allocValue();
static auto primOp = new PrimOp(prim_callFlake, 1, state.symbols.create("callFlake"));
vPrimOp->type = tPrimOp;
vPrimOp->primOp = primOp;
auto vArg = state.allocValue();
vArg->type = tNull;
auto lockedInput = lockedInputs.inputs.find(inputId);
assert(lockedInput != lockedInputs.inputs.end());
// FIXME: leak
vArg->attrs = (Bindings *) new FlakeInput(dep.second); // evil! also inefficient
vArg->attrs = (Bindings *) new LazyInput{input.isFlake, lockedInput->second};
mkApp(*vFlake, *vPrimOp, *vArg);
}
for (auto & dep : inputs.nonFlakeInputs) {
auto vNonFlake = state.allocAttr(vInputs, dep.first);
auto vPrimOp = state.allocValue();
static auto primOp = new PrimOp(prim_callNonFlake, 1, state.symbols.create("callNonFlake"));
vPrimOp->type = tPrimOp;
vPrimOp->primOp = primOp;
auto vArg = state.allocValue();
vArg->type = tNull;
// FIXME: leak
vArg->attrs = (Bindings *) new NonFlakeInput(dep.second); // evil! also inefficient
mkApp(*vNonFlake, *vPrimOp, *vArg);
}
auto & vSourceInfo = *state.allocValue();
state.mkAttrs(vSourceInfo, 8);
emitSourceInfoAttrs(state, flake.sourceInfo, vSourceInfo);

20
src/libexpr/flake/flake.hh
View file

@ -58,14 +58,20 @@ struct SourceInfo
SourceInfo(const FlakeRef & resolvRef) : resolvedRef(resolvRef) {};
};
struct FlakeInput
{
FlakeRef ref;
bool isFlake = true;
FlakeInput(const FlakeRef & ref) : ref(ref) {};
};
struct Flake
{
FlakeId id;
FlakeRef originalRef;
std::string description;
SourceInfo sourceInfo;
std::vector<FlakeRef> inputs;
std::map<FlakeAlias, FlakeRef> nonFlakeInputs;
std::map<FlakeId, FlakeInput> inputs;
Value * vOutputs; // FIXME: gc
unsigned int edition;
@ -73,14 +79,6 @@ struct Flake
: originalRef(origRef), sourceInfo(sourceInfo) {};
};
struct NonFlake
{
FlakeRef originalRef;
SourceInfo sourceInfo;
NonFlake(const FlakeRef & origRef, const SourceInfo & sourceInfo)
: originalRef(origRef), sourceInfo(sourceInfo) {};
};
Flake getFlake(EvalState &, const FlakeRef &);
/* If 'allowLookup' is true, then resolve 'flakeRef' using the
@ -108,7 +106,7 @@ ResolvedFlake resolveFlake(EvalState &, const FlakeRef &, HandleLockFile);
void callFlake(EvalState & state,
const Flake & flake,
const FlakeInputs & inputs,
const LockedInputs & inputs,
Value & v);
void callFlake(EvalState & state,

52
src/libexpr/flake/lockfile.cc
View file

@ -3,83 +3,57 @@
namespace nix::flake {
AbstractInput::AbstractInput(const nlohmann::json & json)
: ref(json["uri"])
LockedInput::LockedInput(const nlohmann::json & json)
: LockedInputs(json)
, ref(json["uri"])
, narHash(Hash((std::string) json["narHash"]))
{
if (!ref.isImmutable())
throw Error("lockfile contains mutable flakeref '%s'", ref);
}
nlohmann::json AbstractInput::toJson() const
nlohmann::json LockedInput::toJson() const
{
nlohmann::json json;
auto json = LockedInputs::toJson();
json["uri"] = ref.to_string();
json["narHash"] = narHash.to_string(SRI);
return json;
}
Path AbstractInput::computeStorePath(Store & store) const
Path LockedInput::computeStorePath(Store & store) const
{
return store.makeFixedOutputPath(true, narHash, "source");
}
FlakeInput::FlakeInput(const nlohmann::json & json)
: FlakeInputs(json)
, AbstractInput(json)
, id(json["id"])
LockedInputs::LockedInputs(const nlohmann::json & json)
{
}
nlohmann::json FlakeInput::toJson() const
{
auto json = FlakeInputs::toJson();
json.update(AbstractInput::toJson());
json["id"] = id;
return json;
}
FlakeInputs::FlakeInputs(const nlohmann::json & json)
{
for (auto & i : json["nonFlakeInputs"].items())
nonFlakeInputs.insert_or_assign(i.key(), NonFlakeInput(i.value()));
for (auto & i : json["inputs"].items())
flakeInputs.insert_or_assign(i.key(), FlakeInput(i.value()));
inputs.insert_or_assign(i.key(), LockedInput(i.value()));
}
nlohmann::json FlakeInputs::toJson() const
nlohmann::json LockedInputs::toJson() const
{
nlohmann::json json;
{
auto j = nlohmann::json::object();
for (auto & i : nonFlakeInputs)
for (auto & i : inputs)
j[i.first] = i.second.toJson();
json["nonFlakeInputs"] = std::move(j);
}
{
auto j = nlohmann::json::object();
for (auto & i : flakeInputs)
j[i.first.to_string()] = i.second.toJson();
json["inputs"] = std::move(j);
}
return json;
}
bool FlakeInputs::isDirty() const
bool LockedInputs::isDirty() const
{
for (auto & i : flakeInputs)
for (auto & i : inputs)
if (i.second.ref.isDirty() || i.second.isDirty()) return true;
for (auto & i : nonFlakeInputs)
if (i.second.ref.isDirty()) return true;
return false;
}
nlohmann::json LockFile::toJson() const
{
auto json = FlakeInputs::toJson();
auto json = LockedInputs::toJson();
json["version"] = 2;
return json;
}

79
src/libexpr/flake/lockfile.hh
View file

@ -10,47 +10,15 @@ class Store;
namespace nix::flake {
/* Common lock file information about a flake input, namely the
immutable ref and the NAR hash. */
struct AbstractInput
{
FlakeRef ref;
Hash narHash;
AbstractInput(const FlakeRef & flakeRef, const Hash & narHash)
: ref(flakeRef), narHash(narHash)
{
assert(ref.isImmutable());
};
AbstractInput(const nlohmann::json & json);
nlohmann::json toJson() const;
Path computeStorePath(Store & store) const;
};
/* Lock file information about a non-flake input. */
struct NonFlakeInput : AbstractInput
{
using AbstractInput::AbstractInput;
bool operator ==(const NonFlakeInput & other) const
{
return ref == other.ref && narHash == other.narHash;
}
};
struct FlakeInput;
struct LockedInput;
/* Lock file information about the dependencies of a flake. */
struct FlakeInputs
struct LockedInputs
{
std::map<FlakeRef, FlakeInput> flakeInputs;
std::map<FlakeAlias, NonFlakeInput> nonFlakeInputs;
std::map<FlakeId, LockedInput> inputs;
FlakeInputs() {};
FlakeInputs(const nlohmann::json & json);
LockedInputs() {};
LockedInputs(const nlohmann::json & json);
nlohmann::json toJson() const;
@ -60,47 +28,48 @@ struct FlakeInputs
};
/* Lock file information about a flake input. */
struct FlakeInput : FlakeInputs, AbstractInput
struct LockedInput : LockedInputs
{
FlakeId id;
FlakeRef ref;
Hash narHash;
FlakeInput(const FlakeId & id, const FlakeRef & flakeRef, const Hash & narHash)
: AbstractInput(flakeRef, narHash), id(id) {};
LockedInput(const FlakeRef & ref, const Hash & narHash)
: ref(ref), narHash(narHash)
{
assert(ref.isImmutable());
};
FlakeInput(const nlohmann::json & json);
LockedInput(const nlohmann::json & json);
bool operator ==(const FlakeInput & other) const
bool operator ==(const LockedInput & other) const
{
return
id == other.id
&& ref == other.ref
ref == other.ref
&& narHash == other.narHash
&& flakeInputs == other.flakeInputs
&& nonFlakeInputs == other.nonFlakeInputs;
&& inputs == other.inputs;
}
nlohmann::json toJson() const;
Path computeStorePath(Store & store) const;
};
/* An entire lock file. Note that this cannot be a FlakeInput for the
top-level flake, because then the lock file would need to contain
the hash of the top-level flake, but committing the lock file
would invalidate that hash. */
struct LockFile : FlakeInputs
struct LockFile : LockedInputs
{
bool operator ==(const LockFile & other) const
{
return
flakeInputs == other.flakeInputs
&& nonFlakeInputs == other.nonFlakeInputs;
return inputs == other.inputs;
}
LockFile() {}
LockFile(const nlohmann::json & json) : FlakeInputs(json) {}
LockFile(FlakeInput && dep)
LockFile(const nlohmann::json & json) : LockedInputs(json) {}
LockFile(LockedInput && dep)
{
flakeInputs = std::move(dep.flakeInputs);
nonFlakeInputs = std::move(dep.nonFlakeInputs);
inputs = std::move(dep.inputs);
}
nlohmann::json toJson() const;

1
src/libexpr/primops/fetchGit.cc
View file

@ -31,7 +31,6 @@ GitInfo exportGit(ref<Store> store, std::string uri,
// or revision is given, then allow the use of an unclean working
// tree.
if (!ref && !rev && isLocal) {
bool clean = true;
try {

11
src/nix/installables.cc
View file

@ -217,25 +217,20 @@ void makeFlakeClosureGCRoot(Store & store,
assert(store.isValidPath(resFlake.flake.sourceInfo.storePath));
closure.insert(resFlake.flake.sourceInfo.storePath);
std::queue<std::reference_wrapper<const flake::FlakeInputs>> queue;
std::queue<std::reference_wrapper<const flake::LockedInputs>> queue;
queue.push(resFlake.lockFile);
while (!queue.empty()) {
const flake::FlakeInputs & flake = queue.front();
const flake::LockedInputs & flake = queue.front();
queue.pop();
/* Note: due to lazy fetching, these paths might not exist
yet. */
for (auto & dep : flake.flakeInputs) {
for (auto & dep : flake.inputs) {
auto path = dep.second.computeStorePath(store);
if (store.isValidPath(path))
closure.insert(path);
queue.push(dep.second);
}
for (auto & dep : flake.nonFlakeInputs) {
auto path = dep.second.computeStorePath(store);
if (store.isValidPath(path))
closure.insert(path);
}
}
if (closure.empty()) return;

26
tests/flakes.sh
View file

@ -240,10 +240,13 @@ cat > $flake3Dir/flake.nix <<EOF
edition = 201909;
inputs = [ "flake1" "flake2" ];
nonFlakeInputs = {
nonFlake = "$nonFlakeDir";
inputs = {
flake1 = {};
flake2 = {};
nonFlake = {
uri = "$nonFlakeDir";
flake = false;
};
};
description = "Fnord";
@ -306,23 +309,24 @@ cat > $flake3Dir/flake.nix <<EOF
edition = 201909;
inputs = [ "flake1" "flake2" ];
nonFlakeInputs = {
nonFlake = "$nonFlakeDir";
inputs = {
nonFlake = {
uri = "$nonFlakeDir";
flake = false;
};
};
description = "Fnord";
outputs = inputs: rec {
packages.sth = inputs.flake1.packages.foo;
outputs = { self, flake1, flake2, nonFlake }: rec {
packages.sth = flake1.packages.foo;
packages.fnord =
with import ./config.nix;
mkDerivation {
inherit system;
name = "fnord";
buildCommand = ''
cat \${inputs.nonFlake}/README.md > \$out
cat \${nonFlake}/README.md > \$out
'';
};
};