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Merge branch 'path-info' into ca-drv-exotic

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This commit is contained in:
John Ericson 2023-01-14 17:09:58 -05:00
commit 7c82213813
97 changed files with 1868 additions and 1001 deletions
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15
src/libexpr/eval-cache.cc
View file

@ -300,7 +300,7 @@ struct AttrDb
NixStringContext context;
if (!queryAttribute.isNull(3))
for (auto & s : tokenizeString<std::vector<std::string>>(queryAttribute.getStr(3), ";"))
context.push_back(decodeContext(cfg, s));
context.push_back(NixStringContextElem::parse(cfg, s));
return {{rowId, string_t{queryAttribute.getStr(2), context}}};
}
case AttrType::Bool:
@ -592,7 +592,18 @@ string_t AttrCursor::getStringWithContext()
if (auto s = std::get_if<string_t>(&cachedValue->second)) {
bool valid = true;
for (auto & c : s->second) {
if (!root->state.store->isValidPath(c.first)) {
const StorePath & path = std::visit(overloaded {
[&](const NixStringContextElem::DrvDeep & d) -> const StorePath & {
return d.drvPath;
},
[&](const NixStringContextElem::Built & b) -> const StorePath & {
return b.drvPath;
},
[&](const NixStringContextElem::Opaque & o) -> const StorePath & {
return o.path;
},
}, c.raw());
if (!root->state.store->isValidPath(path)) {
valid = false;
break;
}

51
src/libexpr/eval.cc
View file

@ -2068,27 +2068,6 @@ std::string_view EvalState::forceString(Value & v, const PosIdx pos, std::string
}
/* Decode a context string ‘!<name>!<path>’ into a pair <path,
name>. */
NixStringContextElem decodeContext(const Store & store, std::string_view s)
{
if (s.at(0) == '!') {
size_t index = s.find("!", 1);
return {
store.parseStorePath(s.substr(index + 1)),
std::string(s.substr(1, index - 1)),
};
} else
return {
store.parseStorePath(
s.at(0) == '/'
? s
: s.substr(1)),
"",
};
}
void copyContext(const Value & v, PathSet & context)
{
if (v.string.context)
@ -2103,7 +2082,7 @@ NixStringContext Value::getContext(const Store & store)
assert(internalType == tString);
if (string.context)
for (const char * * p = string.context; *p; ++p)
res.push_back(decodeContext(store, *p));
res.push_back(NixStringContextElem::parse(store, *p));
return res;
}
@ -2166,7 +2145,7 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
if (canonicalizePath)
path = canonPath(*path);
if (copyToStore)
path = copyPathToStore(context, std::move(path).toOwned());
path = store->printStorePath(copyPathToStore(context, std::move(path).toOwned()));
return path;
}
@ -2215,26 +2194,26 @@ BackedStringView EvalState::coerceToString(const PosIdx pos, Value & v, PathSet
}
std::string EvalState::copyPathToStore(PathSet & context, const Path & path)
StorePath EvalState::copyPathToStore(PathSet & context, const Path & path)
{
if (nix::isDerivation(path))
error("file names are not allowed to end in '%1%'", drvExtension).debugThrow<EvalError>();
Path dstPath;
auto i = srcToStore.find(path);
if (i != srcToStore.end())
dstPath = store->printStorePath(i->second);
else {
auto p = settings.readOnlyMode
auto dstPath = [&]() -> StorePath
{
auto i = srcToStore.find(path);
if (i != srcToStore.end()) return i->second;
auto dstPath = settings.readOnlyMode
? store->computeStorePathForPath(std::string(baseNameOf(path)), checkSourcePath(path)).first
: store->addToStore(std::string(baseNameOf(path)), checkSourcePath(path), FileIngestionMethod::Recursive, htSHA256, defaultPathFilter, repair);
dstPath = store->printStorePath(p);
allowPath(p);
srcToStore.insert_or_assign(path, std::move(p));
printMsg(lvlChatty, "copied source '%1%' -> '%2%'", path, dstPath);
}
allowPath(dstPath);
srcToStore.insert_or_assign(path, dstPath);
printMsg(lvlChatty, "copied source '%1%' -> '%2%'", path, store->printStorePath(dstPath));
return dstPath;
}();
context.insert(dstPath);
context.insert(store->printStorePath(dstPath));
return dstPath;
}

6
src/libexpr/eval.hh
View file

@ -379,7 +379,7 @@ public:
bool canonicalizePath = true,
std::string_view errorCtx = "");
std::string copyPathToStore(PathSet & context, const Path & path);
StorePath copyPathToStore(PathSet & context, const Path & path);
/* Path coercion. Converts strings, paths and derivations to a
path. The result is guaranteed to be a canonicalised, absolute
@ -551,10 +551,6 @@ struct DebugTraceStacker {
std::string_view showType(ValueType type);
std::string showType(const Value & v);
/* Decode a context string ‘!<name>!<path>’ into a pair <path,
name>. */
NixStringContextElem decodeContext(const Store & store, std::string_view s);
/* If `path' refers to a directory, then append "/default.nix". */
Path resolveExprPath(Path path);

8
src/libexpr/flake/flakeref.cc
View file

@ -238,15 +238,15 @@ std::pair<fetchers::Tree, FlakeRef> FlakeRef::fetchTree(ref<Store> store) const
return {std::move(tree), FlakeRef(std::move(lockedInput), subdir)};
}
std::tuple<FlakeRef, std::string, OutputsSpec> parseFlakeRefWithFragmentAndOutputsSpec(
std::tuple<FlakeRef, std::string, ExtendedOutputsSpec> parseFlakeRefWithFragmentAndExtendedOutputsSpec(
const std::string & url,
const std::optional<Path> & baseDir,
bool allowMissing,
bool isFlake)
{
auto [prefix, outputsSpec] = parseOutputsSpec(url);
auto [flakeRef, fragment] = parseFlakeRefWithFragment(prefix, baseDir, allowMissing, isFlake);
return {std::move(flakeRef), fragment, outputsSpec};
auto [prefix, extendedOutputsSpec] = ExtendedOutputsSpec::parse(url);
auto [flakeRef, fragment] = parseFlakeRefWithFragment(std::string { prefix }, baseDir, allowMissing, isFlake);
return {std::move(flakeRef), fragment, extendedOutputsSpec};
}
}

4
src/libexpr/flake/flakeref.hh
View file

@ -3,7 +3,7 @@
#include "types.hh"
#include "hash.hh"
#include "fetchers.hh"
#include "path-with-outputs.hh"
#include "outputs-spec.hh"
#include <variant>
@ -80,7 +80,7 @@ std::pair<FlakeRef, std::string> parseFlakeRefWithFragment(
std::optional<std::pair<FlakeRef, std::string>> maybeParseFlakeRefWithFragment(
const std::string & url, const std::optional<Path> & baseDir = {});
std::tuple<FlakeRef, std::string, OutputsSpec> parseFlakeRefWithFragmentAndOutputsSpec(
std::tuple<FlakeRef, std::string, ExtendedOutputsSpec> parseFlakeRefWithFragmentAndExtendedOutputsSpec(
const std::string & url,
const std::optional<Path> & baseDir = {},
bool allowMissing = false,

3
src/libexpr/local.mk
View file

@ -6,6 +6,7 @@ libexpr_DIR := $(d)
libexpr_SOURCES := \
$(wildcard $(d)/*.cc) \
$(wildcard $(d)/value/*.cc) \
$(wildcard $(d)/primops/*.cc) \
$(wildcard $(d)/flake/*.cc) \
$(d)/lexer-tab.cc \
@ -37,6 +38,8 @@ clean-files += $(d)/parser-tab.cc $(d)/parser-tab.hh $(d)/lexer-tab.cc $(d)/lexe
$(eval $(call install-file-in, $(d)/nix-expr.pc, $(libdir)/pkgconfig, 0644))
$(foreach i, $(wildcard src/libexpr/value/*.hh), \
$(eval $(call install-file-in, $(i), $(includedir)/nix/value, 0644)))
$(foreach i, $(wildcard src/libexpr/flake/*.hh), \
$(eval $(call install-file-in, $(i), $(includedir)/nix/flake, 0644)))

120
src/libexpr/primops.cc
View file

@ -43,16 +43,32 @@ StringMap EvalState::realiseContext(const PathSet & context)
std::vector<DerivedPath::Built> drvs;
StringMap res;
for (auto & i : context) {
auto [ctx, outputName] = decodeContext(*store, i);
auto ctxS = store->printStorePath(ctx);
if (!store->isValidPath(ctx))
debugThrowLastTrace(InvalidPathError(store->printStorePath(ctx)));
if (!outputName.empty() && ctx.isDerivation()) {
drvs.push_back({ctx, {outputName}});
} else {
res.insert_or_assign(ctxS, ctxS);
}
for (auto & c_ : context) {
auto ensureValid = [&](const StorePath & p) {
if (!store->isValidPath(p))
debugThrowLastTrace(InvalidPathError(store->printStorePath(p)));
};
auto c = NixStringContextElem::parse(*store, c_);
std::visit(overloaded {
[&](const NixStringContextElem::Built & b) {
drvs.push_back(DerivedPath::Built {
.drvPath = b.drvPath,
.outputs = OutputsSpec::Names { b.output },
});
ensureValid(b.drvPath);
},
[&](const NixStringContextElem::Opaque & o) {
auto ctxS = store->printStorePath(o.path);
res.insert_or_assign(ctxS, ctxS);
ensureValid(o.path);
},
[&](const NixStringContextElem::DrvDeep & d) {
/* Treat same as Opaque */
auto ctxS = store->printStorePath(d.drvPath);
res.insert_or_assign(ctxS, ctxS);
ensureValid(d.drvPath);
},
}, c.raw());
}
if (drvs.empty()) return {};
@ -68,16 +84,12 @@ StringMap EvalState::realiseContext(const PathSet & context)
store->buildPaths(buildReqs);
/* Get all the output paths corresponding to the placeholders we had */
for (auto & [drvPath, outputs] : drvs) {
const auto outputPaths = store->queryDerivationOutputMap(drvPath);
for (auto & outputName : outputs) {
auto outputPath = get(outputPaths, outputName);
if (!outputPath)
debugThrowLastTrace(Error("derivation '%s' does not have an output named '%s'",
store->printStorePath(drvPath), outputName));
for (auto & drv : drvs) {
auto outputs = resolveDerivedPath(*store, drv);
for (auto & [outputName, outputPath] : outputs) {
res.insert_or_assign(
downstreamPlaceholder(*store, drvPath, outputName),
store->printStorePath(*outputPath)
downstreamPlaceholder(*store, drv.drvPath, outputName),
store->printStorePath(outputPath)
);
}
}
@ -240,6 +252,7 @@ static RegisterPrimOp primop_scopedImport(RegisterPrimOp::Info {
static RegisterPrimOp primop_import({
.name = "import",
.args = {"path"},
// TODO turn "normal path values" into link below
.doc = R"(
Load, parse and return the Nix expression in the file *path*. If
*path* is a directory, the file ` default.nix ` in that directory
@ -253,7 +266,7 @@ static RegisterPrimOp primop_import({
>
> Unlike some languages, `import` is a regular function in Nix.
> Paths using the angle bracket syntax (e.g., `import` *\<foo\>*)
> are [normal path values](language-values.md).
> are normal [path values](@docroot@/language/values.md#type-path).
A Nix expression loaded by `import` must not contain any *free
variables* (identifiers that are not defined in the Nix expression
@ -1180,38 +1193,31 @@ static void prim_derivationStrict(EvalState & state, const PosIdx pos, Value * *
/* Everything in the context of the strings in the derivation
attributes should be added as dependencies of the resulting
derivation. */
for (auto & path : context) {
/* Paths marked with `=' denote that the path of a derivation
is explicitly passed to the builder. Since that allows the
builder to gain access to every path in the dependency
graph of the derivation (including all outputs), all paths
in the graph must be added to this derivation's list of
inputs to ensure that they are available when the builder
runs. */
if (path.at(0) == '=') {
/* !!! This doesn't work if readOnlyMode is set. */
StorePathSet refs;
state.store->computeFSClosure(state.store->parseStorePath(std::string_view(path).substr(1)), refs);
for (auto & j : refs) {
drv.inputSrcs.insert(j);
if (j.isDerivation()) {
Derivation jDrv = state.store->readDerivation(j);
if(jDrv.type().hasKnownOutputPaths())
drv.inputDrvs[j] = jDrv.outputNames();
for (auto & c_ : context) {
auto c = NixStringContextElem::parse(*state.store, c_);
std::visit(overloaded {
/* Since this allows the builder to gain access to every
path in the dependency graph of the derivation (including
all outputs), all paths in the graph must be added to
this derivation's list of inputs to ensure that they are
available when the builder runs. */
[&](const NixStringContextElem::DrvDeep & d) {
/* !!! This doesn't work if readOnlyMode is set. */
StorePathSet refs;
state.store->computeFSClosure(d.drvPath, refs);
for (auto & j : refs) {
drv.inputSrcs.insert(j);
if (j.isDerivation())
drv.inputDrvs[j] = state.store->readDerivation(j).outputNames();
}
}
}
/* Handle derivation outputs of the form ‘!<name>!<path>’. */
else if (path.at(0) == '!') {
auto ctx = decodeContext(*state.store, path);
drv.inputDrvs[ctx.first].insert(ctx.second);
}
/* Otherwise it's a source file. */
else
drv.inputSrcs.insert(state.store->parseStorePath(path));
},
[&](const NixStringContextElem::Built & b) {
drv.inputDrvs[b.drvPath].insert(b.output);
},
[&](const NixStringContextElem::Opaque & o) {
drv.inputSrcs.insert(o.path);
},
}, c.raw());
}
/* Do we have all required attributes? */
@ -1532,8 +1538,7 @@ static void prim_readFile(EvalState & state, const PosIdx pos, Value * * args, V
StorePathSet refs;
if (state.store->isInStore(path)) {
try {
// FIXME: Are self references becoming non-self references OK?
refs = state.store->queryPathInfo(state.store->toStorePath(path).first)->referencesPossiblyToSelf();
refs = state.store->queryPathInfo(state.store->toStorePath(path).first)->references;
} catch (Error &) { // FIXME: should be InvalidPathError
}
// Re-scan references to filter down to just the ones that actually occur in the file.
@ -1876,8 +1881,7 @@ static RegisterPrimOp primop_toFile({
path. The file has suffix *name*. This file can be used as an
input to derivations. One application is to write builders
“inline”. For instance, the following Nix expression combines the
[Nix expression for GNU Hello](expression-syntax.md) and its
[build script](build-script.md) into one file:
Nix expression for GNU Hello and its build script into one file:
```nix
{ stdenv, fetchurl, perl }:
@ -1921,7 +1925,7 @@ static RegisterPrimOp primop_toFile({
```
Note that `${configFile}` is a
[string interpolation](language/values.md#type-string), so the result of the
[string interpolation](@docroot@/language/values.md#type-string), so the result of the
expression `configFile`
(i.e., a path like `/nix/store/m7p7jfny445k...-foo.conf`) will be
spliced into the resulting string.
@ -1969,7 +1973,7 @@ static void addPath(
try {
auto [storePath, subPath] = state.store->toStorePath(path);
// FIXME: we should scanForReferences on the path before adding it
refs = state.store->queryPathInfo(storePath)->referencesPossiblyToSelf();
refs = state.store->queryPathInfo(storePath)->references;
path = state.store->toRealPath(storePath) + subPath;
} catch (Error &) { // FIXME: should be InvalidPathError
}
@ -2817,7 +2821,7 @@ static RegisterPrimOp primop_map({
example,
```nix
map (x"foo" + x) [ "bar" "bla" "abc" ]
map (x: "foo" + x) [ "bar" "bla" "abc" ]
```
evaluates to `[ "foobar" "foobla" "fooabc" ]`.

51
src/libexpr/primops/context.cc
View file

@ -37,8 +37,15 @@ static void prim_unsafeDiscardOutputDependency(EvalState & state, const PosIdx p
auto s = state.coerceToString(pos, *args[0], context, "while evaluating the argument passed to builtins.unsafeDiscardOutputDependency");
PathSet context2;
for (auto & p : context)
context2.insert(p.at(0) == '=' ? std::string(p, 1) : p);
for (auto && p : context) {
auto c = NixStringContextElem::parse(*state.store, p);
if (auto * ptr = std::get_if<NixStringContextElem::DrvDeep>(&c)) {
context2.emplace(state.store->printStorePath(ptr->drvPath));
} else {
/* Can reuse original item */
context2.emplace(std::move(p));
}
}
v.mkString(*s, context2);
}
@ -74,34 +81,22 @@ static void prim_getContext(EvalState & state, const PosIdx pos, Value * * args,
};
PathSet context;
state.forceString(*args[0], context, pos, "while evaluating the argument passed to builtins.getContext");
auto contextInfos = std::map<Path, ContextInfo>();
auto contextInfos = std::map<StorePath, ContextInfo>();
for (const auto & p : context) {
Path drv;
std::string output;
const Path * path = &p;
if (p.at(0) == '=') {
drv = std::string(p, 1);
path = &drv;
} else if (p.at(0) == '!') {
NixStringContextElem ctx = decodeContext(*state.store, p);
drv = state.store->printStorePath(ctx.first);
output = ctx.second;
path = &drv;
}
auto isPath = drv.empty();
auto isAllOutputs = (!drv.empty()) && output.empty();
auto iter = contextInfos.find(*path);
if (iter == contextInfos.end()) {
contextInfos.emplace(*path, ContextInfo{isPath, isAllOutputs, output.empty() ? Strings{} : Strings{std::move(output)}});
} else {
if (isPath)
iter->second.path = true;
else if (isAllOutputs)
iter->second.allOutputs = true;
else
iter->second.outputs.emplace_back(std::move(output));
}
NixStringContextElem ctx = NixStringContextElem::parse(*state.store, p);
std::visit(overloaded {
[&](NixStringContextElem::DrvDeep & d) {
contextInfos[d.drvPath].allOutputs = true;
},
[&](NixStringContextElem::Built & b) {
contextInfos[b.drvPath].outputs.emplace_back(std::move(output));
},
[&](NixStringContextElem::Opaque & o) {
contextInfos[o.path].path = true;
},
}, ctx.raw());
}
auto attrs = state.buildBindings(contextInfos.size());
@ -120,7 +115,7 @@ static void prim_getContext(EvalState & state, const PosIdx pos, Value * * args,
for (const auto & [i, output] : enumerate(info.second.outputs))
(outputsVal.listElems()[i] = state.allocValue())->mkString(output);
}
attrs.alloc(info.first).mkAttrs(infoAttrs);
attrs.alloc(state.store->printStorePath(info.first)).mkAttrs(infoAttrs);
}
v.mkAttrs(attrs);

4
src/libexpr/tests/local.mk
View file

@ -6,7 +6,9 @@ libexpr-tests_DIR := $(d)
libexpr-tests_INSTALL_DIR :=
libexpr-tests_SOURCES := $(wildcard $(d)/*.cc)
libexpr-tests_SOURCES := \
$(wildcard $(d)/*.cc) \
$(wildcard $(d)/value/*.cc)
libexpr-tests_CXXFLAGS += -I src/libexpr -I src/libutil -I src/libstore -I src/libexpr/tests

72
src/libexpr/tests/value/context.cc Normal file
View file

@ -0,0 +1,72 @@
#include "value/context.hh"
#include "libexprtests.hh"
namespace nix {
// Testing of trivial expressions
struct NixStringContextElemTest : public LibExprTest {
const Store & store() const {
return *LibExprTest::store;
}
};
TEST_F(NixStringContextElemTest, empty_invalid) {
EXPECT_THROW(
NixStringContextElem::parse(store(), ""),
BadNixStringContextElem);
}
TEST_F(NixStringContextElemTest, single_bang_invalid) {
EXPECT_THROW(
NixStringContextElem::parse(store(), "!"),
BadNixStringContextElem);
}
TEST_F(NixStringContextElemTest, double_bang_invalid) {
EXPECT_THROW(
NixStringContextElem::parse(store(), "!!/"),
BadStorePath);
}
TEST_F(NixStringContextElemTest, eq_slash_invalid) {
EXPECT_THROW(
NixStringContextElem::parse(store(), "=/"),
BadStorePath);
}
TEST_F(NixStringContextElemTest, slash_invalid) {
EXPECT_THROW(
NixStringContextElem::parse(store(), "/"),
BadStorePath);
}
TEST_F(NixStringContextElemTest, opaque) {
std::string_view opaque = "/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x";
auto elem = NixStringContextElem::parse(store(), opaque);
auto * p = std::get_if<NixStringContextElem::Opaque>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->path, store().parseStorePath(opaque));
ASSERT_EQ(elem.to_string(store()), opaque);
}
TEST_F(NixStringContextElemTest, drvDeep) {
std::string_view drvDeep = "=/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv";
auto elem = NixStringContextElem::parse(store(), drvDeep);
auto * p = std::get_if<NixStringContextElem::DrvDeep>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->drvPath, store().parseStorePath(drvDeep.substr(1)));
ASSERT_EQ(elem.to_string(store()), drvDeep);
}
TEST_F(NixStringContextElemTest, built) {
std::string_view built = "!foo!/nix/store/g1w7hy3qg1w7hy3qg1w7hy3qg1w7hy3q-x.drv";
auto elem = NixStringContextElem::parse(store(), built);
auto * p = std::get_if<NixStringContextElem::Built>(&elem);
ASSERT_TRUE(p);
ASSERT_EQ(p->output, "foo");
ASSERT_EQ(p->drvPath, store().parseStorePath(built.substr(5)));
ASSERT_EQ(elem.to_string(store()), built);
}
}

3
src/libexpr/value-to-json.cc
View file

@ -1,6 +1,7 @@
#include "value-to-json.hh"
#include "eval-inline.hh"
#include "util.hh"
#include "store-api.hh"
#include <cstdlib>
#include <iomanip>
@ -35,7 +36,7 @@ json printValueAsJSON(EvalState & state, bool strict,
case nPath:
if (copyToStore)
out = state.copyPathToStore(context, v.path);
out = state.store->printStorePath(state.copyPathToStore(context, v.path));
else
out = v.path;
break;

3
src/libexpr/value.hh
View file

@ -3,6 +3,7 @@
#include <cassert>
#include "symbol-table.hh"
#include "value/context.hh"
#if HAVE_BOEHMGC
#include <gc/gc_allocator.h>
@ -67,8 +68,6 @@ class XMLWriter;
typedef int64_t NixInt;
typedef double NixFloat;
typedef std::pair<StorePath, std::string> NixStringContextElem;
typedef std::vector<NixStringContextElem> NixStringContext;
/* External values must descend from ExternalValueBase, so that
* type-agnostic nix functions (e.g. showType) can be implemented

67
src/libexpr/value/context.cc Normal file
View file

@ -0,0 +1,67 @@
#include "value/context.hh"
#include "store-api.hh"
#include <optional>
namespace nix {
NixStringContextElem NixStringContextElem::parse(const Store & store, std::string_view s0)
{
std::string_view s = s0;
if (s.size() == 0) {
throw BadNixStringContextElem(s0,
"String context element should never be an empty string");
}
switch (s.at(0)) {
case '!': {
s = s.substr(1); // advance string to parse after first !
size_t index = s.find("!");
// This makes index + 1 safe. Index can be the length (one after index
// of last character), so given any valid character index --- a
// successful find --- we can add one.
if (index == std::string_view::npos) {
throw BadNixStringContextElem(s0,
"String content element beginning with '!' should have a second '!'");
}
return NixStringContextElem::Built {
.drvPath = store.parseStorePath(s.substr(index + 1)),
.output = std::string(s.substr(0, index)),
};
}
case '=': {
return NixStringContextElem::DrvDeep {
.drvPath = store.parseStorePath(s.substr(1)),
};
}
default: {
return NixStringContextElem::Opaque {
.path = store.parseStorePath(s),
};
}
}
}
std::string NixStringContextElem::to_string(const Store & store) const {
return std::visit(overloaded {
[&](const NixStringContextElem::Built & b) {
std::string res;
res += '!';
res += b.output;
res += '!';
res += store.printStorePath(b.drvPath);
return res;
},
[&](const NixStringContextElem::DrvDeep & d) {
std::string res;
res += '=';
res += store.printStorePath(d.drvPath);
return res;
},
[&](const NixStringContextElem::Opaque & o) {
return store.printStorePath(o.path);
},
}, raw());
}
}

90
src/libexpr/value/context.hh Normal file
View file

@ -0,0 +1,90 @@
#pragma once
#include "util.hh"
#include "path.hh"
#include <optional>
#include <nlohmann/json_fwd.hpp>
namespace nix {
class BadNixStringContextElem : public Error
{
public:
std::string_view raw;
template<typename... Args>
BadNixStringContextElem(std::string_view raw_, const Args & ... args)
: Error("")
{
raw = raw_;
auto hf = hintfmt(args...);
err.msg = hintfmt("Bad String Context element: %1%: %2%", normaltxt(hf.str()), raw);
}
};
class Store;
/* Plain opaque path to some store object.
Encoded as just the path: ‘<path>’.
*/
struct NixStringContextElem_Opaque {
StorePath path;
};
/* Path to a derivation and its entire build closure.
The path doesn't just refer to derivation itself and its closure, but
also all outputs of all derivations in that closure (including the
root derivation).
Encoded in the form ‘=<drvPath>’.
*/
struct NixStringContextElem_DrvDeep {
StorePath drvPath;
};
/* Derivation output.
Encoded in the form ‘!<output>!<drvPath>’.
*/
struct NixStringContextElem_Built {
StorePath drvPath;
std::string output;
};
using _NixStringContextElem_Raw = std::variant<
NixStringContextElem_Opaque,
NixStringContextElem_DrvDeep,
NixStringContextElem_Built
>;
struct NixStringContextElem : _NixStringContextElem_Raw {
using Raw = _NixStringContextElem_Raw;
using Raw::Raw;
using Opaque = NixStringContextElem_Opaque;
using DrvDeep = NixStringContextElem_DrvDeep;
using Built = NixStringContextElem_Built;
inline const Raw & raw() const {
return static_cast<const Raw &>(*this);
}
inline Raw & raw() {
return static_cast<Raw &>(*this);
}
/* Decode a context string, one of:
- ‘<path>’
- ‘=<path>’
- ‘!<name>!<path>’
*/
static NixStringContextElem parse(const Store & store, std::string_view s);
std::string to_string(const Store & store) const;
};
typedef std::vector<NixStringContextElem> NixStringContext;
}