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Merge remote-tracking branch 'origin/master' into lazy-trees

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This commit is contained in:
Eelco Dolstra 2022-07-13 12:50:03 +02:00
commit 934f317250
35 changed files with 510 additions and 115 deletions
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2
src/libcmd/command.cc
View file

@ -120,7 +120,7 @@ ref<EvalState> EvalCommand::getEvalState()
;
if (startReplOnEvalErrors) {
evalState->debugRepl = &runRepl;
evalState->debugRepl = &runRepl;
};
}
return ref<EvalState>(evalState);

18
src/libcmd/command.hh
View file

@ -58,6 +58,7 @@ struct CopyCommand : virtual StoreCommand
struct EvalCommand : virtual StoreCommand, MixEvalArgs
{
bool startReplOnEvalErrors = false;
bool ignoreExceptionsDuringTry = false;
EvalCommand();
@ -77,10 +78,16 @@ struct MixFlakeOptions : virtual Args, EvalCommand
{
flake::LockFlags lockFlags;
std::optional<std::string> needsFlakeInputCompletion = {};
MixFlakeOptions();
virtual std::optional<FlakeRef> getFlakeRefForCompletion()
virtual std::vector<std::string> getFlakesForCompletion()
{ return {}; }
void completeFlakeInput(std::string_view prefix);
void completionHook() override;
};
struct SourceExprCommand : virtual Args, MixFlakeOptions
@ -116,12 +123,13 @@ struct InstallablesCommand : virtual Args, SourceExprCommand
InstallablesCommand();
void prepare() override;
Installables load();
virtual bool useDefaultInstallables() { return true; }
std::optional<FlakeRef> getFlakeRefForCompletion() override;
std::vector<std::string> getFlakesForCompletion() override;
private:
protected:
std::vector<std::string> _installables;
};
@ -135,9 +143,9 @@ struct InstallableCommand : virtual Args, SourceExprCommand
void prepare() override;
std::optional<FlakeRef> getFlakeRefForCompletion() override
std::vector<std::string> getFlakesForCompletion() override
{
return parseFlakeRefWithFragment(_installable, absPath(".")).first;
return {_installable};
}
private:

53
src/libcmd/installables.cc
View file

@ -23,17 +23,6 @@
namespace nix {
void completeFlakeInputPath(
ref<EvalState> evalState,
const FlakeRef & flakeRef,
std::string_view prefix)
{
auto flake = flake::getFlake(*evalState, flakeRef, true);
for (auto & input : flake.inputs)
if (hasPrefix(input.first, prefix))
completions->add(input.first);
}
MixFlakeOptions::MixFlakeOptions()
{
auto category = "Common flake-related options";
@ -86,8 +75,7 @@ MixFlakeOptions::MixFlakeOptions()
lockFlags.inputUpdates.insert(flake::parseInputPath(s));
}},
.completer = {[&](size_t, std::string_view prefix) {
if (auto flakeRef = getFlakeRefForCompletion())
completeFlakeInputPath(getEvalState(), *flakeRef, prefix);
needsFlakeInputCompletion = {std::string(prefix)};
}}
});
@ -103,12 +91,10 @@ MixFlakeOptions::MixFlakeOptions()
parseFlakeRef(flakeRef, absPath("."), true));
}},
.completer = {[&](size_t n, std::string_view prefix) {
if (n == 0) {
if (auto flakeRef = getFlakeRefForCompletion())
completeFlakeInputPath(getEvalState(), *flakeRef, prefix);
} else if (n == 1) {
if (n == 0)
needsFlakeInputCompletion = {std::string(prefix)};
else if (n == 1)
completeFlakeRef(getEvalState()->store, prefix);
}
}}
});
@ -139,6 +125,24 @@ MixFlakeOptions::MixFlakeOptions()
});
}
void MixFlakeOptions::completeFlakeInput(std::string_view prefix)
{
auto evalState = getEvalState();
for (auto & flakeRefS : getFlakesForCompletion()) {
auto flakeRef = parseFlakeRefWithFragment(expandTilde(flakeRefS), absPath(".")).first;
auto flake = flake::getFlake(*evalState, flakeRef, true);
for (auto & input : flake.inputs)
if (hasPrefix(input.first, prefix))
completions->add(input.first);
}
}
void MixFlakeOptions::completionHook()
{
if (auto & prefix = needsFlakeInputCompletion)
completeFlakeInput(*prefix);
}
SourceExprCommand::SourceExprCommand(bool supportReadOnlyMode)
{
addFlag({
@ -1041,21 +1045,26 @@ InstallablesCommand::InstallablesCommand()
void InstallablesCommand::prepare()
{
installables = load();
}
Installables InstallablesCommand::load() {
Installables installables;
if (_installables.empty() && useDefaultInstallables())
// FIXME: commands like "nix profile install" should not have a
// default, probably.
_installables.push_back(".");
installables = parseInstallables(getStore(), _installables);
return parseInstallables(getStore(), _installables);
}
std::optional<FlakeRef> InstallablesCommand::getFlakeRefForCompletion()
std::vector<std::string> InstallablesCommand::getFlakesForCompletion()
{
if (_installables.empty()) {
if (useDefaultInstallables())
return parseFlakeRefWithFragment(".", absPath(".")).first;
return {"."};
return {};
}
return parseFlakeRefWithFragment(_installables.front(), absPath(".")).first;
return _installables;
}
InstallableCommand::InstallableCommand(bool supportReadOnlyMode)

2
src/libcmd/installables.hh
View file

@ -132,6 +132,8 @@ struct Installable
const std::vector<std::shared_ptr<Installable>> & installables);
};
typedef std::vector<std::shared_ptr<Installable>> Installables;
struct InstallableValue : Installable
{
ref<EvalState> state;

119
src/libcmd/repl.cc
View file

@ -22,6 +22,7 @@ extern "C" {
#include "ansicolor.hh"
#include "shared.hh"
#include "eval.hh"
#include "eval-cache.hh"
#include "eval-inline.hh"
#include "attr-path.hh"
#include "store-api.hh"
@ -54,6 +55,8 @@ struct NixRepl
size_t debugTraceIndex;
Strings loadedFiles;
typedef std::vector<std::pair<Value*,std::string>> AnnotatedValues;
std::function<AnnotatedValues()> getValues;
const static int envSize = 32768;
std::shared_ptr<StaticEnv> staticEnv;
@ -63,13 +66,15 @@ struct NixRepl
const Path historyFile;
NixRepl(ref<EvalState> state);
NixRepl(const Strings & searchPath, nix::ref<Store> store,ref<EvalState> state,
std::function<AnnotatedValues()> getValues);
~NixRepl();
void mainLoop(const std::vector<std::string> & files);
void mainLoop();
StringSet completePrefix(const std::string & prefix);
bool getLine(std::string & input, const std::string & prompt);
StorePath getDerivationPath(Value & v);
bool processLine(std::string line);
void loadFile(const Path & path);
void loadFlake(const std::string & flakeRef);
void initEnv();
@ -96,9 +101,11 @@ std::string removeWhitespace(std::string s)
}
NixRepl::NixRepl(ref<EvalState> state)
NixRepl::NixRepl(const Strings & searchPath, nix::ref<Store> store, ref<EvalState> state,
std::function<NixRepl::AnnotatedValues()> getValues)
: state(state)
, debugTraceIndex(0)
, getValues(getValues)
, staticEnv(new StaticEnv(false, state->staticBaseEnv.get()))
, historyFile(getDataDir() + "/nix/repl-history")
{
@ -111,23 +118,20 @@ NixRepl::~NixRepl()
write_history(historyFile.c_str());
}
std::string runNix(Path program, const Strings & args,
void runNix(Path program, const Strings & args,
const std::optional<std::string> & input = {})
{
auto subprocessEnv = getEnv();
subprocessEnv["NIX_CONFIG"] = globalConfig.toKeyValue();
auto res = runProgram(RunOptions {
runProgram2(RunOptions {
.program = settings.nixBinDir+ "/" + program,
.args = args,
.environment = subprocessEnv,
.input = input,
});
if (!statusOk(res.first))
throw ExecError(res.first, "program '%1%' %2%", program, statusToString(res.first));
return res.second;
return;
}
static NixRepl * curRepl; // ugly
@ -226,18 +230,12 @@ static std::ostream & showDebugTrace(std::ostream & out, const PosTable & positi
return out;
}
void NixRepl::mainLoop(const std::vector<std::string> & files)
void NixRepl::mainLoop()
{
std::string error = ANSI_RED "error:" ANSI_NORMAL " ";
notice("Welcome to Nix " + nixVersion + ". Type :? for help.\n");
if (!files.empty()) {
for (auto & i : files)
loadedFiles.push_back(i);
}
loadFiles();
if (!loadedFiles.empty()) notice("");
// Allow nix-repl specific settings in .inputrc
rl_readline_name = "nix-repl";
@ -749,7 +747,6 @@ bool NixRepl::processLine(std::string line)
return true;
}
void NixRepl::loadFile(const Path & path)
{
loadedFiles.remove(path);
@ -809,13 +806,15 @@ void NixRepl::loadFiles()
Strings old = loadedFiles;
loadedFiles.clear();
bool first = true;
for (auto & i : old) {
if (!first) notice("");
first = false;
notice("Loading '%1%'...", i);
loadFile(i);
}
for (auto & [i, what] : getValues()) {
notice("Loading installable '%1%'...", what);
addAttrsToScope(*i);
}
}
@ -1015,7 +1014,17 @@ void runRepl(
ref<EvalState>evalState,
const ValMap & extraEnv)
{
auto repl = std::make_unique<NixRepl>(evalState);
auto getValues = [&]()->NixRepl::AnnotatedValues{
NixRepl::AnnotatedValues values;
return values;
};
const Strings & searchPath = {};
auto repl = std::make_unique<NixRepl>(
searchPath,
openStore(),
evalState,
getValues
);
repl->initEnv();
@ -1023,20 +1032,35 @@ void runRepl(
for (auto & [name, value] : extraEnv)
repl->addVarToScope(repl->state->symbols.create(name), *value);
repl->mainLoop({});
repl->mainLoop();
}
struct CmdRepl : StoreCommand, MixEvalArgs
struct CmdRepl : InstallablesCommand
{
std::vector<std::string> files;
CmdRepl()
CmdRepl(){
evalSettings.pureEval = false;
}
void prepare()
{
expectArgs({
.label = "files",
.handler = {&files},
.completer = completePath
});
if (!settings.isExperimentalFeatureEnabled(Xp::ReplFlake) && !(file) && this->_installables.size() >= 1) {
warn("future versions of Nix will require using `--file` to load a file");
if (this->_installables.size() > 1)
warn("more than one input file is not currently supported");
auto filePath = this->_installables[0].data();
file = std::optional(filePath);
_installables.front() = _installables.back();
_installables.pop_back();
}
installables = InstallablesCommand::load();
}
std::vector<std::string> files;
Strings getDefaultFlakeAttrPaths() override
{
return {""};
}
virtual bool useDefaultInstallables() override
{
return file.has_value() or expr.has_value();
}
bool forceImpureByDefault() override
@ -1058,12 +1082,37 @@ struct CmdRepl : StoreCommand, MixEvalArgs
void run(ref<Store> store) override
{
auto evalState = make_ref<EvalState>(searchPath, store);
auto repl = std::make_unique<NixRepl>(evalState);
auto state = getEvalState();
auto getValues = [&]()->NixRepl::AnnotatedValues{
auto installables = load();
NixRepl::AnnotatedValues values;
for (auto & installable: installables){
auto what = installable->what();
if (file){
auto [val, pos] = installable->toValue(*state);
auto what = installable->what();
state->forceValue(*val, pos);
auto autoArgs = getAutoArgs(*state);
auto valPost = state->allocValue();
state->autoCallFunction(*autoArgs, *val, *valPost);
state->forceValue(*valPost, pos);
values.push_back( {valPost, what });
} else {
auto [val, pos] = installable->toValue(*state);
values.push_back( {val, what} );
}
}
return values;
};
auto repl = std::make_unique<NixRepl>(
searchPath,
openStore(),
state,
getValues
);
repl->autoArgs = getAutoArgs(*repl->state);
repl->initEnv();
repl->mainLoop(files);
repl->mainLoop();
}
};

2
src/libexpr/eval-cache.cc
View file

@ -489,7 +489,7 @@ std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(Symbol name, bool forceErro
return nullptr;
else if (std::get_if<failed_t>(&attr->second)) {
if (forceErrors)
debug("reevaluating failed cached attribute '%s'");
debug("reevaluating failed cached attribute '%s'", getAttrPathStr(name));
else
throw CachedEvalError("cached failure of attribute '%s'", getAttrPathStr(name));
} else

12
src/libexpr/eval.cc
View file

@ -481,9 +481,10 @@ EvalState::EvalState(
)}
, store(store)
, buildStore(buildStore ? buildStore : store)
, debugRepl(0)
, debugRepl(nullptr)
, debugStop(false)
, debugQuit(false)
, trylevel(0)
, regexCache(makeRegexCache())
#if HAVE_BOEHMGC
, valueAllocCache(std::allocate_shared<void *>(traceable_allocator<void *>(), nullptr))
@ -788,7 +789,14 @@ void EvalState::runDebugRepl(const Error * error, const Env & env, const Expr &
: nullptr;
if (error)
printError("%s\n\n" ANSI_BOLD "Starting REPL to allow you to inspect the current state of the evaluator.\n" ANSI_NORMAL, error->what());
{
printError("%s\n\n", error->what());
if (trylevel > 0 && error->info().level != lvlInfo)
printError("This exception occurred in a 'tryEval' call. Use " ANSI_GREEN "--ignore-try" ANSI_NORMAL " to skip these.\n");
printError(ANSI_BOLD "Starting REPL to allow you to inspect the current state of the evaluator.\n" ANSI_NORMAL);
}
auto se = getStaticEnv(expr);
if (se) {

10
src/libexpr/eval.hh
View file

@ -128,6 +128,7 @@ public:
void (* debugRepl)(ref<EvalState> es, const ValMap & extraEnv);
bool debugStop;
bool debugQuit;
int trylevel;
std::list<DebugTrace> debugTraces;
std::map<const Expr*, const std::shared_ptr<const StaticEnv>> exprEnvs;
const std::shared_ptr<const StaticEnv> getStaticEnv(const Expr & expr) const
@ -643,6 +644,15 @@ struct EvalSettings : Config
Setting<bool> useEvalCache{this, true, "eval-cache",
"Whether to use the flake evaluation cache."};
Setting<bool> ignoreExceptionsDuringTry{this, false, "ignore-try",
R"(
If set to true, ignore exceptions inside 'tryEval' calls when evaluating nix expressions in
debug mode (using the --debugger flag). By default the debugger will pause on all exceptions.
)"};
Setting<bool> traceVerbose{this, false, "trace-verbose",
"Whether `builtins.traceVerbose` should trace its first argument when evaluated."};
};
extern EvalSettings evalSettings;

35
src/libexpr/flake/flake.cc
View file

@ -324,6 +324,39 @@ LockedFlake lockFlake(
std::vector<FlakeRef> parents;
std::function<void(
const InputPath & inputPathPrefix,
const FlakeInputs & flakeInputs
)>
checkFollowsDeclarations;
checkFollowsDeclarations = [&](
const InputPath & inputPathPrefix,
const FlakeInputs & flakeInputs
) {
for (auto [inputPath, inputOverride] : overrides) {
auto inputPath2(inputPath);
auto follow = inputPath2.back();
inputPath2.pop_back();
if (inputPath2 == inputPathPrefix
&& flakeInputs.find(follow) == flakeInputs.end()
) {
std::string root;
for (auto & element : inputPath2) {
root.append(element);
if (element != inputPath2.back()) {
root.append(".inputs.");
}
}
warn(
"%s has a `follows'-declaration for a non-existent input %s!",
root,
follow
);
}
}
};
std::function<void(
const FlakeInputs & flakeInputs,
std::shared_ptr<Node> node,
@ -356,6 +389,8 @@ LockedFlake lockFlake(
{
debug("computing lock file node '%s'", printInputPath(inputPathPrefix));
checkFollowsDeclarations(inputPathPrefix, flakeInputs);
/* Get the overrides (i.e. attributes of the form
'inputs.nixops.inputs.nixpkgs.url = ...'). */
for (auto & [id, input] : flakeInputs) {

38
src/libexpr/primops.cc
View file

@ -853,6 +853,18 @@ static RegisterPrimOp primop_floor({
static void prim_tryEval(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
auto attrs = state.buildBindings(2);
/* increment state.trylevel, and decrement it when this function returns. */
MaintainCount trylevel(state.trylevel);
void (* savedDebugRepl)(ref<EvalState> es, const ValMap & extraEnv) = nullptr;
if (state.debugRepl && evalSettings.ignoreExceptionsDuringTry)
{
/* to prevent starting the repl from exceptions withing a tryEval, null it. */
savedDebugRepl = state.debugRepl;
state.debugRepl = nullptr;
}
try {
state.forceValue(*args[0], pos);
attrs.insert(state.sValue, args[0]);
@ -861,6 +873,11 @@ static void prim_tryEval(EvalState & state, const PosIdx pos, Value * * args, Va
attrs.alloc(state.sValue).mkBool(false);
attrs.alloc("success").mkBool(false);
}
// restore the debugRepl pointer if we saved it earlier.
if (savedDebugRepl)
state.debugRepl = savedDebugRepl;
v.mkAttrs(attrs);
}
@ -972,6 +989,15 @@ static RegisterPrimOp primop_trace({
});
/* Takes two arguments and evaluates to the second one. Used as the
* builtins.traceVerbose implementation when --trace-verbose is not enabled
*/
static void prim_second(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
state.forceValue(*args[1], pos);
v = *args[1];
}
/*************************************************************
* Derivations
*************************************************************/
@ -3952,6 +3978,18 @@ void EvalState::createBaseEnv()
addPrimOp("__exec", 1, prim_exec);
}
addPrimOp({
.fun = evalSettings.traceVerbose ? prim_trace : prim_second,
.arity = 2,
.name = "__traceVerbose",
.args = { "e1", "e2" },
.doc = R"(
Evaluate *e1* and print its abstract syntax representation on standard
error if `--trace-verbose` is enabled. Then return *e2*. This function
is useful for debugging.
)",
});
/* Add a value containing the current Nix expression search path. */
mkList(v, searchPath.size());
int n = 0;

9
src/libstore/store-api.cc
View file

@ -1330,9 +1330,14 @@ std::shared_ptr<Store> openFromNonUri(const std::string & uri, const Store::Para
we're not root, then automatically set up a chroot
store in ~/.local/share/nix/root. */
auto chrootStore = getDataDir() + "/nix/root";
if (!pathExists(chrootStore))
if (!pathExists(chrootStore)) {
try {
createDirs(chrootStore);
} catch (Error & e) {
return std::make_shared<LocalStore>(params);
}
warn("'/nix' does not exist, so Nix will use '%s' as a chroot store", chrootStore);
else
} else
debug("'/nix' does not exist, so Nix will use '%s' as a chroot store", chrootStore);
Store::Params params2;
params2["root"] = chrootStore;

10
src/libutil/args.cc
View file

@ -124,7 +124,7 @@ bool Args::processFlag(Strings::iterator & pos, Strings::iterator end)
bool anyCompleted = false;
for (size_t n = 0 ; n < flag.handler.arity; ++n) {
if (pos == end) {
if (flag.handler.arity == ArityAny) break;
if (flag.handler.arity == ArityAny || anyCompleted) break;
throw UsageError("flag '%s' requires %d argument(s)", name, flag.handler.arity);
}
if (auto prefix = needsCompletion(*pos)) {
@ -362,6 +362,14 @@ bool MultiCommand::processArgs(const Strings & args, bool finish)
return Args::processArgs(args, finish);
}
void MultiCommand::completionHook()
{
if (command)
return command->second->completionHook();
else
return Args::completionHook();
}
nlohmann::json MultiCommand::toJSON()
{
auto cmds = nlohmann::json::object();

7
src/libutil/args.hh
View file

@ -148,6 +148,11 @@ protected:
argument (if any) have been processed. */
virtual void initialFlagsProcessed() {}
/* Called after the command line has been processed if we need to generate
completions. Useful for commands that need to know the whole command line
in order to know what completions to generate. */
virtual void completionHook() { }
public:
void addFlag(Flag && flag);
@ -223,6 +228,8 @@ public:
bool processArgs(const Strings & args, bool finish) override;
void completionHook() override;
nlohmann::json toJSON() override;
};

1
src/libutil/experimental-features.cc
View file

@ -13,6 +13,7 @@ std::map<ExperimentalFeature, std::string> stringifiedXpFeatures = {
{ Xp::RecursiveNix, "recursive-nix" },
{ Xp::NoUrlLiterals, "no-url-literals" },
{ Xp::FetchClosure, "fetch-closure" },
{ Xp::ReplFlake, "repl-flake" },
};
const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::string_view & name)

1
src/libutil/experimental-features.hh
View file

@ -22,6 +22,7 @@ enum struct ExperimentalFeature
RecursiveNix,
NoUrlLiterals,
FetchClosure,
ReplFlake,
};
/**

38
src/nix-build/nix-build.cc
View file

@ -257,11 +257,12 @@ static void main_nix_build(int argc, char * * argv)
auto autoArgs = myArgs.getAutoArgs(*state);
auto autoArgsWithInNixShell = autoArgs;
if (runEnv) {
auto newArgs = state->buildBindings(autoArgs->size() + 1);
auto newArgs = state->buildBindings(autoArgsWithInNixShell->size() + 1);
newArgs.alloc("inNixShell").mkBool(true);
for (auto & i : *autoArgs) newArgs.insert(i);
autoArgs = newArgs.finish();
autoArgsWithInNixShell = newArgs.finish();
}
if (packages) {
@ -319,10 +320,39 @@ static void main_nix_build(int argc, char * * argv)
Value vRoot;
state->eval(e, vRoot);
std::function<bool(const Value & v)> takesNixShellAttr;
takesNixShellAttr = [&](const Value & v) {
if (!runEnv) {
return false;
}
bool add = false;
if (v.type() == nFunction && v.lambda.fun->hasFormals()) {
for (auto & i : v.lambda.fun->formals->formals) {
if (state->symbols[i.name] == "inNixShell") {
add = true;
break;
}
}
}
return add;
};
for (auto & i : attrPaths) {
Value & v(*findAlongAttrPath(*state, i, *autoArgs, vRoot).first);
Value & v(*findAlongAttrPath(
*state,
i,
takesNixShellAttr(vRoot) ? *autoArgsWithInNixShell : *autoArgs,
vRoot
).first);
state->forceValue(v, [&]() { return v.determinePos(noPos); });
getDerivations(*state, v, "", *autoArgs, drvs, false);
getDerivations(
*state,
v,
"",
takesNixShellAttr(v) ? *autoArgsWithInNixShell : *autoArgs,
drvs,
false
);
}
}

14
src/nix/develop.cc
View file

@ -276,15 +276,25 @@ struct Common : InstallableCommand, MixProfile
const BuildEnvironment & buildEnvironment,
const Path & outputsDir = absPath(".") + "/outputs")
{
// A list of colon-separated environment variables that should be
// prepended to, rather than overwritten, in order to keep the shell usable.
// Please keep this list minimal in order to avoid impurities.
static const char * const savedVars[] = {
"PATH", // for commands
"XDG_DATA_DIRS", // for loadable completion
};
std::ostringstream out;
out << "unset shellHook\n";
out << "nix_saved_PATH=\"$PATH\"\n";
for (auto & var : savedVars)
out << fmt("nix_saved_%s=\"$%s\"\n", var, var);
buildEnvironment.toBash(out, ignoreVars);
out << "PATH=\"$PATH:$nix_saved_PATH\"\n";
for (auto & var : savedVars)
out << fmt("%s=\"$%s:$nix_saved_%s\"\n", var, var, var);
out << "export NIX_BUILD_TOP=\"$(mktemp -d -t nix-shell.XXXXXX)\"\n";
for (auto & i : {"TMP", "TMPDIR", "TEMP", "TEMPDIR"})

34
src/nix/flake.cc
View file

@ -50,9 +50,9 @@ public:
return flake::lockFlake(*getEvalState(), getFlakeRef(), lockFlags);
}
std::optional<FlakeRef> getFlakeRefForCompletion() override
std::vector<std::string> getFlakesForCompletion() override
{
return getFlakeRef();
return {flakeUrl};
}
};
@ -731,7 +731,8 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
PathSet context;
auto templateDir = evalState->coerceToPath(noPos, templateDirAttr, context);
std::vector<CanonPath> files;
std::vector<CanonPath> changedFiles;
std::vector<CanonPath> conflictedFiles;
std::function<void(const SourcePath & from, const CanonPath & to)> copyDir;
copyDir = [&](const SourcePath & from, const CanonPath & to)
@ -748,31 +749,41 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
auto contents = from2.readFile();
if (pathExists(to2.abs())) {
auto contents2 = readFile(to2.abs());
if (contents != contents2)
throw Error("refusing to overwrite existing file '%s'", to2);
if (contents != contents2) {
printError("refusing to overwrite existing file '%s'\nplease merge it manually with '%s'", to2, from2);
conflictedFiles.push_back(to2);
} else {
notice("skipping identical file: %s", from2);
}
continue;
} else
writeFile(to2.abs(), contents);
}
else if (st.type == InputAccessor::tSymlink) {
auto target = from2.readLink();
if (pathExists(to2.abs())) {
if (readLink(to2.abs()) != target)
throw Error("refusing to overwrite existing symlink '%s'", to2);
if (readLink(to2.abs()) != target) {
printError("refusing to overwrite existing file '%s'\n please merge it manually with '%s'", to2, from2);
conflictedFiles.push_back(to2);
} else {
notice("skipping identical file: %s", from2);
}
continue;
} else
createSymlink(target, to2.abs());
}
else
throw Error("file '%s' has unsupported type", from2);
files.push_back(to2);
changedFiles.push_back(to2);
notice("wrote: %s", to2);
}
};
copyDir(templateDir, CanonPath(flakeDir));
if (pathExists(flakeDir + "/.git")) {
if (!changedFiles.empty() && pathExists(flakeDir + "/.git")) {
Strings args = { "-C", flakeDir, "add", "--intent-to-add", "--force", "--" };
for (auto & s : files) args.push_back(s.abs());
for (auto & s : changedFiles) args.push_back(s.abs());
runProgram("git", true, args);
}
@ -780,6 +791,9 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
notice("\n");
notice(renderMarkdownToTerminal(welcomeText->getString()));
}
if (!conflictedFiles.empty())
throw Error("encountered %d conflicts - see above", conflictedFiles.size());
}
};

5
src/nix/main.cc
View file

@ -344,7 +344,10 @@ void mainWrapped(int argc, char * * argv)
if (!completions) throw;
}
if (completions) return;
if (completions) {
args.completionHook();
return;
}
if (args.showVersion) {
printVersion(programName);

30
src/nix/repl.md
View file

@ -24,10 +24,34 @@ R""(
* Interact with Nixpkgs in the REPL:
```console
# nix repl '<nixpkgs>'
# nix repl --file example.nix
Loading Installable ''...
Added 3 variables.
Loading '<nixpkgs>'...
Added 12428 variables.
# nix repl --expr '{a={b=3;c=4;};}'
Loading Installable ''...
Added 1 variables.
# nix repl --expr '{a={b=3;c=4;};}' a
Loading Installable ''...
Added 1 variables.
# nix repl --extra_experimental_features 'flakes repl-flake' nixpkgs
Loading Installable 'flake:nixpkgs#'...
Added 5 variables.
nix-repl> legacyPackages.x86_64-linux.emacs.name
"emacs-27.1"
nix-repl> legacyPackages.x86_64-linux.emacs.name
"emacs-27.1"
nix-repl> :q
# nix repl --expr 'import <nixpkgs>{}'
Loading Installable ''...
Added 12439 variables.
nix-repl> emacs.name
"emacs-27.1"