Merge pull request #2920 from NixOS/lazy-flakes

Lazy flake input fetching
This commit is contained in:
Eelco Dolstra 2019-06-06 12:28:20 +02:00 committed by GitHub
commit 671f16aee0
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GPG key ID: 4AEE18F83AFDEB23
13 changed files with 461 additions and 259 deletions

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@ -1,10 +1,13 @@
{
"inputs": {
"nixpkgs": {
"narHash": "sha256-rMiWaLXkhizEEMEeMDutUl0Y/c+VEjfjvMkvBwvuQJU=",
"uri": "github:edolstra/nixpkgs/eeeffd24cd7e407cfaa99e98cfbb8f93bf4cc033"
"id": "nixpkgs",
"inputs": {},
"narHash": "sha256-eYtxncIMFVmOHaHBtTdPGcs/AnJqKqA6tHCm0UmPYQU=",
"nonFlakeInputs": {},
"uri": "github:edolstra/nixpkgs/e9d5882bb861dc48f8d46960e7c820efdbe8f9c1"
}
},
"nonFlakeInputs": {},
"version": 1
"version": 2
}

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@ -7,7 +7,7 @@
#include "eval-inline.hh"
#include "download.hh"
#include "json.hh"
#include "primops/flake.hh"
#include "flake/flake.hh"
#include <algorithm>
#include <cstring>

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@ -1,7 +1,8 @@
#include "flake.hh"
#include "lockfile.hh"
#include "primops.hh"
#include "eval-inline.hh"
#include "fetchGit.hh"
#include "primops/fetchGit.hh"
#include "download.hh"
#include "args.hh"
@ -43,106 +44,13 @@ std::shared_ptr<FlakeRegistry> readRegistry(const Path & path)
void writeRegistry(const FlakeRegistry & registry, const Path & path)
{
nlohmann::json json;
json["version"] = 1;
json["version"] = 2;
for (auto elem : registry.entries)
json["flakes"][elem.first.to_string()] = { {"uri", elem.second.to_string()} };
createDirs(dirOf(path));
writeFile(path, json.dump(4)); // The '4' is the number of spaces used in the indentation in the json file.
}
LockFile::FlakeEntry readFlakeEntry(nlohmann::json json)
{
FlakeRef flakeRef(json["uri"]);
if (!flakeRef.isImmutable())
throw Error("cannot use mutable flake '%s' in pure mode", flakeRef);
LockFile::FlakeEntry entry(flakeRef, Hash((std::string) json["narHash"]));
auto nonFlakeInputs = json["nonFlakeInputs"];
for (auto i = nonFlakeInputs.begin(); i != nonFlakeInputs.end(); ++i) {
FlakeRef flakeRef(i->value("uri", ""));
if (!flakeRef.isImmutable())
throw Error("requested to fetch FlakeRef '%s' purely, which is mutable", flakeRef);
LockFile::NonFlakeEntry nonEntry(flakeRef, Hash(i->value("narHash", "")));
entry.nonFlakeEntries.insert_or_assign(i.key(), nonEntry);
}
auto inputs = json["inputs"];
for (auto i = inputs.begin(); i != inputs.end(); ++i)
entry.flakeEntries.insert_or_assign(i.key(), readFlakeEntry(*i));
return entry;
}
LockFile readLockFile(const Path & path)
{
LockFile lockFile;
if (!pathExists(path))
return lockFile;
auto json = nlohmann::json::parse(readFile(path));
auto version = json.value("version", 0);
if (version != 1)
throw Error("lock file '%s' has unsupported version %d", path, version);
auto nonFlakeInputs = json["nonFlakeInputs"];
for (auto i = nonFlakeInputs.begin(); i != nonFlakeInputs.end(); ++i) {
FlakeRef flakeRef(i->value("uri", ""));
LockFile::NonFlakeEntry nonEntry(flakeRef, Hash(i->value("narHash", "")));
if (!flakeRef.isImmutable())
throw Error("found mutable FlakeRef '%s' in lockfile at path %s", flakeRef, path);
lockFile.nonFlakeEntries.insert_or_assign(i.key(), nonEntry);
}
auto inputs = json["inputs"];
for (auto i = inputs.begin(); i != inputs.end(); ++i)
lockFile.flakeEntries.insert_or_assign(i.key(), readFlakeEntry(*i));
return lockFile;
}
nlohmann::json flakeEntryToJson(const LockFile::FlakeEntry & entry)
{
nlohmann::json json;
json["uri"] = entry.ref.to_string();
json["narHash"] = entry.narHash.to_string(SRI);
for (auto & x : entry.nonFlakeEntries) {
json["nonFlakeInputs"][x.first]["uri"] = x.second.ref.to_string();
json["nonFlakeInputs"][x.first]["narHash"] = x.second.narHash.to_string(SRI);
}
for (auto & x : entry.flakeEntries)
json["inputs"][x.first.to_string()] = flakeEntryToJson(x.second);
return json;
}
std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile)
{
nlohmann::json json;
json["version"] = 1;
json["nonFlakeInputs"] = nlohmann::json::object();
for (auto & x : lockFile.nonFlakeEntries) {
json["nonFlakeInputs"][x.first]["uri"] = x.second.ref.to_string();
json["nonFlakeInputs"][x.first]["narHash"] = x.second.narHash.to_string(SRI);
}
json["inputs"] = nlohmann::json::object();
for (auto & x : lockFile.flakeEntries)
json["inputs"][x.first.to_string()] = flakeEntryToJson(x.second);
stream << json.dump(4); // '4' = indentation in json file
return stream;
}
void writeLockFile(const LockFile & lockFile, const Path & path)
{
createDirs(dirOf(path));
writeFile(path, fmt("%s\n", lockFile));
}
Path getUserRegistryPath()
{
return getHome() + "/.config/nix/registry.json";
@ -368,7 +276,7 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowe
}
// Get the `NonFlake` corresponding to a `FlakeRef`.
NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef, FlakeAlias alias, bool impureIsAllowed = false)
NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
{
auto sourceInfo = fetchFlake(state, flakeRef, impureIsAllowed);
debug("got non-flake source '%s' with flakeref %s", sourceInfo.storePath, sourceInfo.resolvedRef.to_string());
@ -382,38 +290,9 @@ NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef, FlakeAlias al
if (state.allowedPaths)
state.allowedPaths->insert(nonFlake.sourceInfo.storePath);
nonFlake.alias = alias;
return nonFlake;
}
LockFile entryToLockFile(const LockFile::FlakeEntry & entry)
{
LockFile lockFile;
lockFile.flakeEntries = entry.flakeEntries;
lockFile.nonFlakeEntries = entry.nonFlakeEntries;
return lockFile;
}
LockFile::FlakeEntry dependenciesToFlakeEntry(const ResolvedFlake & resolvedFlake)
{
LockFile::FlakeEntry entry(
resolvedFlake.flake.sourceInfo.resolvedRef,
resolvedFlake.flake.sourceInfo.narHash);
for (auto & info : resolvedFlake.flakeDeps)
entry.flakeEntries.insert_or_assign(info.first.to_string(), dependenciesToFlakeEntry(info.second));
for (auto & nonFlake : resolvedFlake.nonFlakeDeps) {
LockFile::NonFlakeEntry nonEntry(
nonFlake.sourceInfo.resolvedRef,
nonFlake.sourceInfo.narHash);
entry.nonFlakeEntries.insert_or_assign(nonFlake.alias, nonEntry);
}
return entry;
}
bool allowedToWrite(HandleLockFile handle)
{
return handle == UpdateLockFile || handle == RecreateLockFile;
@ -435,70 +314,84 @@ bool allowedToUseRegistries(HandleLockFile handle, bool isTopRef)
else assert(false);
}
ResolvedFlake resolveFlakeFromLockFile(EvalState & state, const FlakeRef & flakeRef,
HandleLockFile handleLockFile, LockFile lockFile = {}, bool topRef = false)
/* Given a flakeref and its subtree of the lockfile, return an updated
subtree of the lockfile. That is, if the 'flake.nix' of the
referenced flake has inputs that don't have a corresponding entry
in the lockfile, they're added to the lockfile; conversely, any
lockfile entries that don't have a corresponding entry in flake.nix
are removed.
Note that this is lazy: we only recursively fetch inputs that are
not in the lockfile yet. */
static std::pair<Flake, FlakeInput> updateLocks(
EvalState & state,
const Flake & flake,
HandleLockFile handleLockFile,
const FlakeInputs & oldEntry,
bool topRef)
{
Flake flake = getFlake(state, flakeRef, allowedToUseRegistries(handleLockFile, topRef));
FlakeInput newEntry(
flake.id,
flake.sourceInfo.resolvedRef,
flake.sourceInfo.narHash);
ResolvedFlake deps(flake);
for (auto & nonFlakeInfo : flake.nonFlakeInputs) {
FlakeRef ref = nonFlakeInfo.second;
auto i = lockFile.nonFlakeEntries.find(nonFlakeInfo.first);
if (i != lockFile.nonFlakeEntries.end()) {
NonFlake nonFlake = getNonFlake(state, i->second.ref, nonFlakeInfo.first);
if (nonFlake.sourceInfo.narHash != i->second.narHash)
throw Error("the content hash of flakeref '%s' doesn't match", i->second.ref.to_string());
deps.nonFlakeDeps.push_back(nonFlake);
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);
} else {
if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
throw Error("cannot update non-flake dependency '%s' in pure mode", nonFlakeInfo.first);
deps.nonFlakeDeps.push_back(getNonFlake(state, nonFlakeInfo.second, nonFlakeInfo.first, allowedToUseRegistries(handleLockFile, false)));
throw Error("cannot update non-flake dependency '%s' in pure mode", id);
auto nonFlake = getNonFlake(state, ref, allowedToUseRegistries(handleLockFile, false));
newEntry.nonFlakeInputs.insert_or_assign(id,
NonFlakeInput(
nonFlake.sourceInfo.resolvedRef,
nonFlake.sourceInfo.narHash));
}
}
for (auto newFlakeRef : flake.inputs) {
auto i = lockFile.flakeEntries.find(newFlakeRef);
if (i != lockFile.flakeEntries.end()) { // Propagate lockFile downwards if possible
ResolvedFlake newResFlake = resolveFlakeFromLockFile(state, i->second.ref, handleLockFile, entryToLockFile(i->second));
if (newResFlake.flake.sourceInfo.narHash != i->second.narHash)
throw Error("the content hash of flakeref '%s' doesn't match", i->second.ref.to_string());
deps.flakeDeps.insert_or_assign(newFlakeRef, newResFlake);
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", newFlakeRef.to_string());
deps.flakeDeps.insert_or_assign(newFlakeRef, resolveFlakeFromLockFile(state, newFlakeRef, handleLockFile));
throw Error("cannot update flake dependency '%s' in pure mode", inputRef);
newEntry.flakeInputs.insert_or_assign(inputRef,
updateLocks(state,
getFlake(state, inputRef, allowedToUseRegistries(handleLockFile, false)),
handleLockFile, {}, false).second);
}
}
return deps;
return {flake, newEntry};
}
/* Given a flake reference, recursively fetch it and its dependencies.
FIXME: this should return a graph of flakes.
*/
/* Compute an in-memory lockfile for the specified top-level flake,
and optionally write it to file, it the flake is writable. */
ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLockFile handleLockFile)
{
Flake flake = getFlake(state, topRef, allowedToUseRegistries(handleLockFile, true));
auto flake = getFlake(state, topRef, allowedToUseRegistries(handleLockFile, true));
LockFile oldLockFile;
if (!recreateLockFile(handleLockFile)) {
// If recreateLockFile, start with an empty lockfile
// FIXME: symlink attack
oldLockFile = readLockFile(
oldLockFile = LockFile::read(
state.store->toRealPath(flake.sourceInfo.storePath)
+ "/" + flake.sourceInfo.resolvedRef.subdir + "/flake.lock");
}
LockFile lockFile(oldLockFile);
ResolvedFlake resFlake = resolveFlakeFromLockFile(state, topRef, handleLockFile, lockFile, true);
lockFile = entryToLockFile(dependenciesToFlakeEntry(resFlake));
LockFile lockFile(updateLocks(
state, flake, handleLockFile, oldLockFile, true).second);
if (!(lockFile == oldLockFile)) {
if (allowedToWrite(handleLockFile)) {
if (auto refData = std::get_if<FlakeRef::IsPath>(&topRef.data)) {
writeLockFile(lockFile, refData->path + (topRef.subdir == "" ? "" : "/" + topRef.subdir) + "/flake.lock");
lockFile.write(refData->path + (topRef.subdir == "" ? "" : "/" + topRef.subdir) + "/flake.lock");
// Hack: Make sure that flake.lock is visible to Git, so it ends up in the Nix store.
runProgram("git", true, { "-C", refData->path, "add",
@ -509,7 +402,7 @@ ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLoc
warn("using updated lockfile without writing it to file");
}
return resFlake;
return ResolvedFlake(std::move(flake), std::move(lockFile));
}
void updateLockFile(EvalState & state, const FlakeRef & flakeRef, bool recreateLockFile)
@ -520,7 +413,7 @@ void updateLockFile(EvalState & state, const FlakeRef & flakeRef, bool recreateL
static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo, Value & vAttrs)
{
auto & path = sourceInfo.storePath;
state.store->isValidPath(path);
assert(state.store->isValidPath(path));
mkString(*state.allocAttr(vAttrs, state.sOutPath), path, {path});
if (sourceInfo.resolvedRef.rev) {
@ -539,40 +432,104 @@ static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo
std::put_time(std::gmtime(&*sourceInfo.lastModified), "%Y%m%d%H%M%S")));
}
void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v)
/* 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)
{
// Construct the resulting attrset '{description, outputs,
// ...}'. This attrset is passed lazily as an argument to 'outputs'.
auto lazyFlake = (FlakeInput *) args[0]->attrs;
auto flake = getFlake(state, lazyFlake->ref, false);
state.mkAttrs(v, resFlake.flakeDeps.size() + resFlake.nonFlakeDeps.size() + 8);
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);
for (auto info : resFlake.flakeDeps) {
const ResolvedFlake newResFlake = info.second;
auto vFlake = state.allocAttr(v, newResFlake.flake.id);
callFlake(state, newResFlake, *vFlake);
}
callFlake(state, flake, *lazyFlake, v);
}
for (const NonFlake nonFlake : resFlake.nonFlakeDeps) {
auto vNonFlake = state.allocAttr(v, nonFlake.alias);
state.mkAttrs(*vNonFlake, 8);
static void prim_callNonFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
auto lazyNonFlake = (NonFlakeInput *) args[0]->attrs;
state.store->isValidPath(nonFlake.sourceInfo.storePath);
mkString(*state.allocAttr(*vNonFlake, state.sOutPath),
auto nonFlake = getNonFlake(state, lazyNonFlake->ref);
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);
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, *vNonFlake);
emitSourceInfoAttrs(state, nonFlake.sourceInfo, v);
}
void callFlake(EvalState & state,
const Flake & flake,
const FlakeInputs & inputs,
Value & vRes)
{
// Construct the resulting attrset '{outputs, ...}'. This attrset
// is passed lazily as an argument to the 'outputs' function.
auto & v = *state.allocValue();
state.mkAttrs(v,
inputs.flakeInputs.size() +
inputs.nonFlakeInputs.size() + 8);
for (auto & dep : inputs.flakeInputs) {
auto vFlake = state.allocAttr(v, dep.second.id);
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;
// FIXME: leak
vArg->attrs = (Bindings *) new FlakeInput(dep.second); // evil! also inefficient
mkApp(*vFlake, *vPrimOp, *vArg);
}
mkString(*state.allocAttr(v, state.sDescription), resFlake.flake.description);
for (auto & dep : inputs.nonFlakeInputs) {
auto vNonFlake = state.allocAttr(v, 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);
}
emitSourceInfoAttrs(state, resFlake.flake.sourceInfo, v);
mkString(*state.allocAttr(v, state.sDescription), flake.description);
emitSourceInfoAttrs(state, flake.sourceInfo, v);
auto vOutputs = state.allocAttr(v, state.symbols.create("outputs"));
mkApp(*vOutputs, *resFlake.flake.vOutputs, v);
mkApp(*vOutputs, *flake.vOutputs, v);
v.attrs->push_back(Attr(state.symbols.create("self"), &v));
v.attrs->sort();
/* For convenience, put the outputs directly in the result, so you
can refer to an output of an input as 'inputs.foo.bar' rather
than 'inputs.foo.outputs.bar'. */
auto v2 = *state.allocValue();
state.eval(state.parseExprFromString("res: res.outputs // res", "/"), v2);
state.callFunction(v2, v, vRes, noPos);
}
void callFlake(EvalState & state,
const ResolvedFlake & resFlake,
Value & v)
{
callFlake(state, resFlake.flake, resFlake.lockFile, v);
}
// This function is exposed to be used in nix files.

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@ -1,7 +1,8 @@
#pragma once
#include "types.hh"
#include "flakeref.hh"
#include <variant>
#include "lockfile.hh"
namespace nix {
@ -19,51 +20,12 @@ struct FlakeRegistry
std::map<FlakeRef, FlakeRef> entries;
};
struct LockFile
{
struct NonFlakeEntry
{
FlakeRef ref;
Hash narHash;
NonFlakeEntry(const FlakeRef & flakeRef, const Hash & hash) : ref(flakeRef), narHash(hash) {};
bool operator ==(const NonFlakeEntry & other) const
{
return ref == other.ref && narHash == other.narHash;
}
};
struct FlakeEntry
{
FlakeRef ref;
Hash narHash;
std::map<FlakeRef, FlakeEntry> flakeEntries;
std::map<FlakeAlias, NonFlakeEntry> nonFlakeEntries;
FlakeEntry(const FlakeRef & flakeRef, const Hash & hash) : ref(flakeRef), narHash(hash) {};
bool operator ==(const FlakeEntry & other) const
{
return
ref == other.ref
&& narHash == other.narHash
&& flakeEntries == other.flakeEntries
&& nonFlakeEntries == other.nonFlakeEntries;
}
};
std::map<FlakeRef, FlakeEntry> flakeEntries;
std::map<FlakeAlias, NonFlakeEntry> nonFlakeEntries;
bool operator ==(const LockFile & other) const
{
return
flakeEntries == other.flakeEntries
&& nonFlakeEntries == other.nonFlakeEntries;
}
};
typedef std::vector<std::shared_ptr<FlakeRegistry>> Registries;
std::shared_ptr<FlakeRegistry> readRegistry(const Path &);
void writeRegistry(const FlakeRegistry &, const Path &);
Path getUserRegistryPath();
enum HandleLockFile : unsigned int
@ -75,10 +37,6 @@ enum HandleLockFile : unsigned int
, UseNewLockFile // `RecreateLockFile` without writing to file
};
std::shared_ptr<FlakeRegistry> readRegistry(const Path &);
void writeRegistry(const FlakeRegistry &, const Path &);
struct SourceInfo
{
// Immutable flakeref that this source tree was obtained from.
@ -117,7 +75,6 @@ struct Flake
struct NonFlake
{
FlakeAlias alias;
FlakeRef originalRef;
SourceInfo sourceInfo;
NonFlake(const FlakeRef & origRef, const SourceInfo & sourceInfo)
@ -129,14 +86,21 @@ Flake getFlake(EvalState &, const FlakeRef &, bool impureIsAllowed);
struct ResolvedFlake
{
Flake flake;
std::map<FlakeRef, ResolvedFlake> flakeDeps; // The key in this map, is the originalRef as written in flake.nix
std::vector<NonFlake> nonFlakeDeps;
ResolvedFlake(const Flake & flake) : flake(flake) {}
LockFile lockFile;
ResolvedFlake(Flake && flake, LockFile && lockFile)
: flake(flake), lockFile(lockFile) {}
};
ResolvedFlake resolveFlake(EvalState &, const FlakeRef &, HandleLockFile);
void callFlake(EvalState & state, const ResolvedFlake & resFlake, Value & v);
void callFlake(EvalState & state,
const Flake & flake,
const FlakeInputs & inputs,
Value & v);
void callFlake(EvalState & state,
const ResolvedFlake & resFlake,
Value & v);
void updateLockFile(EvalState &, const FlakeRef & flakeRef, bool recreateLockFile);

View file

@ -0,0 +1,102 @@
#include "lockfile.hh"
#include "store-api.hh"
namespace nix::flake {
AbstractInput::AbstractInput(const nlohmann::json & 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 json;
json["uri"] = ref.to_string();
json["narHash"] = narHash.to_string(SRI);
return json;
}
Path AbstractInput::computeStorePath(Store & store) const
{
return store.makeFixedOutputPath(true, narHash, "source");
}
FlakeInput::FlakeInput(const nlohmann::json & json)
: FlakeInputs(json)
, AbstractInput(json)
, id(json["id"])
{
}
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()));
}
nlohmann::json FlakeInputs::toJson() const
{
nlohmann::json json;
{
auto j = nlohmann::json::object();
for (auto & i : nonFlakeInputs)
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;
}
nlohmann::json LockFile::toJson() const
{
auto json = FlakeInputs::toJson();
json["version"] = 2;
return json;
}
LockFile LockFile::read(const Path & path)
{
if (pathExists(path)) {
auto json = nlohmann::json::parse(readFile(path));
auto version = json.value("version", 0);
if (version != 2)
throw Error("lock file '%s' has unsupported version %d", path, version);
return LockFile(json);
} else
return LockFile();
}
std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile)
{
stream << lockFile.toJson().dump(4); // '4' = indentation in json file
return stream;
}
void LockFile::write(const Path & path) const
{
createDirs(dirOf(path));
writeFile(path, fmt("%s\n", *this));
}
}

View file

@ -0,0 +1,112 @@
#pragma once
#include "flakeref.hh"
#include <nlohmann/json.hpp>
namespace nix {
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;
/* Lock file information about the dependencies of a flake. */
struct FlakeInputs
{
std::map<FlakeRef, FlakeInput> flakeInputs;
std::map<FlakeAlias, NonFlakeInput> nonFlakeInputs;
FlakeInputs() {};
FlakeInputs(const nlohmann::json & json);
nlohmann::json toJson() const;
};
/* Lock file information about a flake input. */
struct FlakeInput : FlakeInputs, AbstractInput
{
FlakeId id;
FlakeInput(const FlakeId & id, const FlakeRef & flakeRef, const Hash & narHash)
: AbstractInput(flakeRef, narHash), id(id) {};
FlakeInput(const nlohmann::json & json);
bool operator ==(const FlakeInput & other) const
{
return
id == other.id
&& ref == other.ref
&& narHash == other.narHash
&& flakeInputs == other.flakeInputs
&& nonFlakeInputs == other.nonFlakeInputs;
}
nlohmann::json toJson() 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
{
bool operator ==(const LockFile & other) const
{
return
flakeInputs == other.flakeInputs
&& nonFlakeInputs == other.nonFlakeInputs;
}
LockFile() {}
LockFile(const nlohmann::json & json) : FlakeInputs(json) {}
LockFile(FlakeInput && dep)
{
flakeInputs = std::move(dep.flakeInputs);
nonFlakeInputs = std::move(dep.nonFlakeInputs);
}
nlohmann::json toJson() const;
static LockFile read(const Path & path);
void write(const Path & path) const;
};
std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile);
}

View file

@ -4,7 +4,12 @@ libexpr_NAME = libnixexpr
libexpr_DIR := $(d)
libexpr_SOURCES := $(wildcard $(d)/*.cc) $(wildcard $(d)/primops/*.cc) $(d)/lexer-tab.cc $(d)/parser-tab.cc
libexpr_SOURCES := \
$(wildcard $(d)/*.cc) \
$(wildcard $(d)/primops/*.cc) \
$(wildcard $(d)/flake/*.cc) \
$(d)/lexer-tab.cc \
$(d)/parser-tab.cc
libexpr_LIBS = libutil libstore

View file

@ -4,7 +4,7 @@
#include "progress-bar.hh"
#include "eval.hh"
#include "eval-inline.hh"
#include "primops/flake.hh"
#include "flake/flake.hh"
#include "get-drvs.hh"
#include "store-api.hh"
@ -122,6 +122,7 @@ static nlohmann::json flakeToJson(const Flake & flake)
return j;
}
#if 0
static void printNonFlakeInfo(const NonFlake & nonFlake)
{
std::cout << fmt("ID: %s\n", nonFlake.alias);
@ -173,6 +174,7 @@ struct CmdFlakeDeps : FlakeCommand
}
}
};
#endif
struct CmdFlakeUpdate : FlakeCommand
{
@ -232,6 +234,7 @@ struct CmdFlakeInfo : FlakeCommand, MixJSON
if (json) {
auto json = flakeToJson(flake);
#if 0
auto state = getEvalState();
auto vFlake = state->allocValue();
@ -254,6 +257,7 @@ struct CmdFlakeInfo : FlakeCommand, MixJSON
});
json["outputs"] = std::move(outputs);
#endif
std::cout << json.dump() << std::endl;
} else
@ -518,7 +522,7 @@ struct CmdFlake : virtual MultiCommand, virtual Command
, make_ref<CmdFlakeUpdate>()
, make_ref<CmdFlakeInfo>()
, make_ref<CmdFlakeCheck>()
, make_ref<CmdFlakeDeps>()
//, make_ref<CmdFlakeDeps>()
, make_ref<CmdFlakeAdd>()
, make_ref<CmdFlakeRemove>()
, make_ref<CmdFlakePin>()

View file

@ -7,7 +7,7 @@
#include "get-drvs.hh"
#include "store-api.hh"
#include "shared.hh"
#include "primops/flake.hh"
#include "flake/flake.hh"
#include <regex>
#include <queue>
@ -195,17 +195,29 @@ void makeFlakeClosureGCRoot(Store & store,
/* Get the store paths of all non-local flakes. */
PathSet closure;
std::queue<std::reference_wrapper<const flake::ResolvedFlake>> queue;
queue.push(resFlake);
assert(store.isValidPath(resFlake.flake.sourceInfo.storePath));
closure.insert(resFlake.flake.sourceInfo.storePath);
std::queue<std::reference_wrapper<const flake::FlakeInputs>> queue;
queue.push(resFlake.lockFile);
while (!queue.empty()) {
const flake::ResolvedFlake & flake = queue.front();
const flake::FlakeInputs & flake = queue.front();
queue.pop();
if (!std::get_if<FlakeRef::IsPath>(&flake.flake.sourceInfo.resolvedRef.data))
closure.insert(flake.flake.sourceInfo.storePath);
for (const auto & dep : flake.flakeDeps)
/* Note: due to lazy fetching, these paths might not exist
yet. */
for (auto & dep : flake.flakeInputs) {
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;

10
src/nlohmann/json_fwd.hpp Normal file
View file

@ -0,0 +1,10 @@
#pragma once
namespace nlohmann {
struct json : basic_json<>
{
using basic_json<>::basic_json;
};
}

View file

@ -55,7 +55,7 @@ cat > $flake2Dir/flake.nix <<EOF
description = "Fnord";
outputs = inputs: rec {
packages.bar = inputs.flake1.outputs.packages.foo;
packages.bar = inputs.flake1.packages.foo;
};
}
EOF
@ -74,7 +74,7 @@ cat > $flake3Dir/flake.nix <<EOF
description = "Fnord";
outputs = inputs: rec {
packages.xyzzy = inputs.flake2.outputs.packages.bar;
packages.xyzzy = inputs.flake2.packages.bar;
};
}
EOF
@ -83,7 +83,7 @@ git -C $flake3Dir add flake.nix
git -C $flake3Dir commit -m 'Initial'
cat > $nonFlakeDir/README.md <<EOF
Not much
FNORD
EOF
git -C $nonFlakeDir add README.md
@ -176,8 +176,8 @@ cat > $flake3Dir/flake.nix <<EOF
description = "Fnord";
outputs = inputs: rec {
packages.xyzzy = inputs.flake2.outputs.packages.bar;
packages.sth = inputs.flake1.outputs.packages.foo;
packages.xyzzy = inputs.flake2.packages.bar;
packages.sth = inputs.flake1.packages.foo;
};
}
EOF
@ -191,6 +191,8 @@ nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth
# Check whether it saved the lockfile
[[ ! (-z $(git -C $flake3Dir diff master)) ]]
git -C $flake3Dir commit -m 'Add lockfile'
# Unsupported epochs should be an error.
sed -i $flake3Dir/flake.nix -e s/201906/201909/
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth 2>&1 | grep 'unsupported epoch'
@ -202,6 +204,7 @@ nix flake list --flake-registry file://$registry --tarball-ttl 0 | grep -q flake
mv $registry.tmp $registry
# Test whether flakes are registered as GC roots for offline use.
# FIXME: use tarballs rather than git.
rm -rf $TEST_HOME/.cache
nix build -o $TEST_ROOT/result --flake-registry file://$registry file://$flake2Dir:bar
mv $flake1Dir $flake1Dir.tmp
@ -230,14 +233,44 @@ cat > $flake3Dir/flake.nix <<EOF
description = "Fnord";
outputs = inputs: rec {
packages.xyzzy = inputs.flake2.outputs.packages.bar;
packages.sth = inputs.flake1.outputs.packages.foo;
packages.xyzzy = inputs.flake2.packages.bar;
packages.sth = inputs.flake1.packages.foo;
packages.fnord =
with import ./config.nix;
mkDerivation {
inherit system;
name = "fnord";
buildCommand = ''
cat \${inputs.nonFlake}/README.md > \$out
'';
};
};
}
EOF
git -C $flake3Dir add flake.nix
cp ./config.nix $flake3Dir
git -C $flake3Dir add flake.nix config.nix
git -C $flake3Dir commit -m 'Add nonFlakeInputs'
# Check whether `nix build` works with a lockfile which is missing a nonFlakeInputs
# Check whether `nix build` works with a lockfile which is missing a
# nonFlakeInputs.
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir:sth
git -C $flake3Dir commit -m 'Update nonFlakeInputs'
nix build -o $TEST_ROOT/result --flake-registry $registry flake3:fnord
[[ $(cat $TEST_ROOT/result) = FNORD ]]
# Check whether flake input fetching is lazy: flake3:sth does not
# depend on flake2, so this shouldn't fail.
rm -rf $TEST_HOME/.cache
clearStore
mv $flake2Dir $flake2Dir.tmp
mv $nonFlakeDir $nonFlakeDir.tmp
nix build -o $TEST_ROOT/result --flake-registry $registry flake3:sth
(! nix build -o $TEST_ROOT/result --flake-registry $registry flake3:xyzzy)
(! nix build -o $TEST_ROOT/result --flake-registry $registry flake3:fnord)
mv $flake2Dir.tmp $flake2Dir
mv $nonFlakeDir.tmp $nonFlakeDir
nix build -o $TEST_ROOT/result --flake-registry $registry flake3:xyzzy flake3:fnord