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Merge remote-tracking branch 'upstream/master' into source-path

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Robert Hensing 2023-04-17 11:41:50 +02:00
commit cb2615cf47
148 changed files with 3908 additions and 1449 deletions
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7
src/libutil/ansicolor.hh
View file

@ -1,9 +1,12 @@
#pragma once
///@file
/**
* @file
*
* @brief Some ANSI escape sequences.
*/
namespace nix {
/* Some ANSI escape sequences. */
#define ANSI_NORMAL "\e[0m"
#define ANSI_BOLD "\e[1m"
#define ANSI_FAINT "\e[2m"

52
src/libutil/archive.hh
View file

@ -20,39 +20,41 @@ namespace nix {
*
* The format is as follows:
*
* IF path points to a REGULAR FILE:
* dump(path) = attrs(
* [ ("type", "regular")
* , ("contents", contents(path))
* ])
* ```
* IF path points to a REGULAR FILE:
* dump(path) = attrs(
* [ ("type", "regular")
* , ("contents", contents(path))
* ])
*
* IF path points to a DIRECTORY:
* dump(path) = attrs(
* [ ("type", "directory")
* , ("entries", concat(map(f, sort(entries(path)))))
* ])
* where f(fn) = attrs(
* [ ("name", fn)
* , ("file", dump(path + "/" + fn))
* ])
* IF path points to a DIRECTORY:
* dump(path) = attrs(
* [ ("type", "directory")
* , ("entries", concat(map(f, sort(entries(path)))))
* ])
* where f(fn) = attrs(
* [ ("name", fn)
* , ("file", dump(path + "/" + fn))
* ])
*
* where:
* where:
*
* attrs(as) = concat(map(attr, as)) + encN(0)
* attrs((a, b)) = encS(a) + encS(b)
* attrs(as) = concat(map(attr, as)) + encN(0)
* attrs((a, b)) = encS(a) + encS(b)
*
* encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary)
* encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary)
*
* encN(n) = 64-bit little-endian encoding of n.
* encN(n) = 64-bit little-endian encoding of n.
*
* contents(path) = the contents of a regular file.
* contents(path) = the contents of a regular file.
*
* sort(strings) = lexicographic sort by 8-bit value (strcmp).
* sort(strings) = lexicographic sort by 8-bit value (strcmp).
*
* entries(path) = the entries of a directory, without `.' and
* `..'.
* entries(path) = the entries of a directory, without `.` and
* `..`.
*
* `+' denotes string concatenation.
* `+` denotes string concatenation.
* ```
*/
void dumpPath(const Path & path, Sink & sink,
PathFilter & filter = defaultPathFilter);
@ -88,7 +90,7 @@ struct ParseSink
/**
* If the NAR archive contains a single file at top-level, then save
* the contents of the file to `s'. Otherwise barf.
* the contents of the file to `s`. Otherwise barf.
*/
struct RetrieveRegularNARSink : ParseSink
{

17
src/libutil/args.cc
View file

@ -236,8 +236,6 @@ nlohmann::json Args::toJSON()
auto flags = nlohmann::json::object();
for (auto & [name, flag] : longFlags) {
/* Skip experimental flags when listing flags. */
if (!experimentalFeatureSettings.isEnabled(flag->experimentalFeature)) continue;
auto j = nlohmann::json::object();
if (flag->aliases.count(name)) continue;
if (flag->shortName)
@ -249,6 +247,11 @@ nlohmann::json Args::toJSON()
j["arity"] = flag->handler.arity;
if (!flag->labels.empty())
j["labels"] = flag->labels;
// TODO With C++23 use `std::optional::tranform`
if (auto & xp = flag->experimentalFeature)
j["experimental-feature"] = showExperimentalFeature(*xp);
else
j["experimental-feature"] = nullptr;
flags[name] = std::move(j);
}
@ -345,6 +348,11 @@ Strings argvToStrings(int argc, char * * argv)
return args;
}
std::optional<ExperimentalFeature> Command::experimentalFeature ()
{
return { Xp::NixCommand };
}
MultiCommand::MultiCommand(const Commands & commands_)
: commands(commands_)
{
@ -408,6 +416,11 @@ nlohmann::json MultiCommand::toJSON()
cat["id"] = command->category();
cat["description"] = trim(categories[command->category()]);
j["category"] = std::move(cat);
// TODO With C++23 use `std::optional::tranform`
if (auto xp = command->experimentalFeature())
cat["experimental-feature"] = showExperimentalFeature(*xp);
else
cat["experimental-feature"] = nullptr;
cmds[name] = std::move(j);
}

2
src/libutil/args.hh
View file

@ -236,6 +236,8 @@ struct Command : virtual public Args
static constexpr Category catDefault = 0;
virtual std::optional<ExperimentalFeature> experimentalFeature ();
virtual Category category() { return catDefault; }
};

6
src/libutil/canon-path.hh
View file

@ -194,8 +194,10 @@ public:
*/
bool isAllowed(const std::set<CanonPath> & allowed) const;
/* Return a representation `x` of `path` relative to `this`, i.e.
`CanonPath(this.makeRelative(x), this) == path`. */
/**
* Return a representation `x` of `path` relative to `this`, i.e.
* `CanonPath(this.makeRelative(x), this) == path`.
*/
std::string makeRelative(const CanonPath & path) const;
};

10
src/libutil/comparator.hh
View file

@ -17,12 +17,12 @@
* }
* ```
*/
#define GENERATE_ONE_CMP(COMPARATOR, MY_TYPE, FIELDS...) \
#define GENERATE_ONE_CMP(COMPARATOR, MY_TYPE, ...) \
bool operator COMPARATOR(const MY_TYPE& other) const { \
const MY_TYPE* me = this; \
auto fields1 = std::make_tuple( FIELDS ); \
me = &other; \
auto fields2 = std::make_tuple( FIELDS ); \
__VA_OPT__(const MY_TYPE* me = this;) \
auto fields1 = std::make_tuple( __VA_ARGS__ ); \
__VA_OPT__(me = &other;) \
auto fields2 = std::make_tuple( __VA_ARGS__ ); \
return fields1 COMPARATOR fields2; \
}
#define GENERATE_EQUAL(args...) GENERATE_ONE_CMP(==, args)

6
src/libutil/compression.cc
View file

@ -23,7 +23,7 @@ struct ChunkedCompressionSink : CompressionSink
{
uint8_t outbuf[32 * 1024];
void write(std::string_view data) override
void writeUnbuffered(std::string_view data) override
{
const size_t CHUNK_SIZE = sizeof(outbuf) << 2;
while (!data.empty()) {
@ -103,7 +103,7 @@ struct ArchiveCompressionSink : CompressionSink
throw Error(reason, archive_error_string(this->archive));
}
void write(std::string_view data) override
void writeUnbuffered(std::string_view data) override
{
ssize_t result = archive_write_data(archive, data.data(), data.length());
if (result <= 0) check(result);
@ -136,7 +136,7 @@ struct NoneSink : CompressionSink
warn("requested compression level '%d' not supported by compression method 'none'", level);
}
void finish() override { flush(); }
void write(std::string_view data) override { nextSink(data); }
void writeUnbuffered(std::string_view data) override { nextSink(data); }
};
struct BrotliDecompressionSink : ChunkedCompressionSink

2
src/libutil/compression.hh
View file

@ -12,7 +12,7 @@ namespace nix {
struct CompressionSink : BufferedSink, FinishSink
{
using BufferedSink::operator ();
using BufferedSink::write;
using BufferedSink::writeUnbuffered;
using FinishSink::finish;
};

20
src/libutil/config.cc
View file

@ -70,17 +70,10 @@ void AbstractConfig::reapplyUnknownSettings()
set(s.first, s.second);
}
// Whether we should process the option. Excludes aliases, which are handled elsewhere, and disabled features.
static bool applicable(const Config::SettingData & sd)
{
return !sd.isAlias
&& experimentalFeatureSettings.isEnabled(sd.setting->experimentalFeature);
}
void Config::getSettings(std::map<std::string, SettingInfo> & res, bool overriddenOnly)
{
for (auto & opt : _settings)
if (applicable(opt.second) && (!overriddenOnly || opt.second.setting->overridden))
if (!opt.second.isAlias && (!overriddenOnly || opt.second.setting->overridden))
res.emplace(opt.first, SettingInfo{opt.second.setting->to_string(), opt.second.setting->description});
}
@ -154,7 +147,7 @@ nlohmann::json Config::toJSON()
{
auto res = nlohmann::json::object();
for (auto & s : _settings)
if (applicable(s.second))
if (!s.second.isAlias)
res.emplace(s.first, s.second.setting->toJSON());
return res;
}
@ -163,7 +156,7 @@ std::string Config::toKeyValue()
{
auto res = std::string();
for (auto & s : _settings)
if (applicable(s.second))
if (s.second.isAlias)
res += fmt("%s = %s\n", s.first, s.second.setting->to_string());
return res;
}
@ -171,9 +164,6 @@ std::string Config::toKeyValue()
void Config::convertToArgs(Args & args, const std::string & category)
{
for (auto & s : _settings) {
/* We do include args for settings gated on disabled
experimental-features. The args themselves however will also be
gated on any experimental feature the underlying setting is. */
if (!s.second.isAlias)
s.second.setting->convertToArg(args, category);
}
@ -201,6 +191,10 @@ std::map<std::string, nlohmann::json> AbstractSetting::toJSONObject()
std::map<std::string, nlohmann::json> obj;
obj.emplace("description", description);
obj.emplace("aliases", aliases);
if (experimentalFeature)
obj.emplace("experimentalFeature", *experimentalFeature);
else
obj.emplace("experimentalFeature", nullptr);
return obj;
}

19
src/libutil/config.hh
View file

@ -371,8 +371,23 @@ extern GlobalConfig globalConfig;
struct ExperimentalFeatureSettings : Config {
Setting<std::set<ExperimentalFeature>> experimentalFeatures{this, {}, "experimental-features",
"Experimental Nix features to enable."};
Setting<std::set<ExperimentalFeature>> experimentalFeatures{
this, {}, "experimental-features",
R"(
Experimental features that are enabled.
Example:
```
experimental-features = nix-command flakes
```
The following experimental features are available:
{{#include experimental-features-shortlist.md}}
Experimental features are [further documented in the manual](@docroot@/contributing/experimental-features.md).
)"};
/**
* Check whether the given experimental feature is enabled.

32
src/libutil/error.hh
View file

@ -1,5 +1,19 @@
#pragma once
///@file
/**
* @file
*
* @brief This file defines two main structs/classes used in nix error handling.
*
* ErrorInfo provides a standard payload of error information, with conversion to string
* happening in the logger rather than at the call site.
*
* BaseError is the ancestor of nix specific exceptions (and Interrupted), and contains
* an ErrorInfo.
*
* ErrorInfo structs are sent to the logger as part of an exception, or directly with the
* logError or logWarning macros.
* See libutil/tests/logging.cc for usage examples.
*/
#include "suggestions.hh"
#include "ref.hh"
@ -27,22 +41,6 @@
namespace nix {
/*
This file defines two main structs/classes used in nix error handling.
ErrorInfo provides a standard payload of error information, with conversion to string
happening in the logger rather than at the call site.
BaseError is the ancestor of nix specific exceptions (and Interrupted), and contains
an ErrorInfo.
ErrorInfo structs are sent to the logger as part of an exception, or directly with the
logError or logWarning macros.
See libutil/tests/logging.cc for usage examples.
*/
typedef enum {
lvlError = 0,

231
src/libutil/experimental-features.cc
View file

@ -5,29 +5,209 @@
namespace nix {
std::map<ExperimentalFeature, std::string> stringifiedXpFeatures = {
{ Xp::CaDerivations, "ca-derivations" },
{ Xp::ImpureDerivations, "impure-derivations" },
{ Xp::Flakes, "flakes" },
{ Xp::NixCommand, "nix-command" },
{ Xp::RecursiveNix, "recursive-nix" },
{ Xp::NoUrlLiterals, "no-url-literals" },
{ Xp::FetchClosure, "fetch-closure" },
{ Xp::ReplFlake, "repl-flake" },
{ Xp::AutoAllocateUids, "auto-allocate-uids" },
{ Xp::Cgroups, "cgroups" },
{ Xp::DiscardReferences, "discard-references" },
struct ExperimentalFeatureDetails
{
ExperimentalFeature tag;
std::string_view name;
std::string_view description;
};
constexpr std::array<ExperimentalFeatureDetails, 11> xpFeatureDetails = {{
{
.tag = Xp::CaDerivations,
.name = "ca-derivations",
.description = R"(
Allow derivations to be content-addressed in order to prevent
rebuilds when changes to the derivation do not result in changes to
the derivation's output. See
[__contentAddressed](@docroot@/language/advanced-attributes.md#adv-attr-__contentAddressed)
for details.
)",
},
{
.tag = Xp::ImpureDerivations,
.name = "impure-derivations",
.description = R"(
Allow derivations to produce non-fixed outputs by setting the
`__impure` derivation attribute to `true`. An impure derivation can
have differing outputs each time it is built.
Example:
```
derivation {
name = "impure";
builder = /bin/sh;
__impure = true; # mark this derivation as impure
args = [ "-c" "read -n 10 random < /dev/random; echo $random > $out" ];
system = builtins.currentSystem;
}
```
Each time this derivation is built, it can produce a different
output (as the builder outputs random bytes to `$out`). Impure
derivations also have access to the network, and only fixed-output
or other impure derivations can rely on impure derivations. Finally,
an impure derivation cannot also be
[content-addressed](#xp-feature-ca-derivations).
)",
},
{
.tag = Xp::Flakes,
.name = "flakes",
.description = R"(
Enable flakes. See the manual entry for [`nix
flake`](@docroot@/command-ref/new-cli/nix3-flake.md) for details.
)",
},
{
.tag = Xp::NixCommand,
.name = "nix-command",
.description = R"(
Enable the new `nix` subcommands. See the manual on
[`nix`](@docroot@/command-ref/new-cli/nix.md) for details.
)",
},
{
.tag = Xp::RecursiveNix,
.name = "recursive-nix",
.description = R"(
Allow derivation builders to call Nix, and thus build derivations
recursively.
Example:
```
with import <nixpkgs> {};
runCommand "foo"
{
buildInputs = [ nix jq ];
NIX_PATH = "nixpkgs=${<nixpkgs>}";
}
''
hello=$(nix-build -E '(import <nixpkgs> {}).hello.overrideDerivation (args: { name = "recursive-hello"; })')
mkdir -p $out/bin
ln -s $hello/bin/hello $out/bin/hello
''
```
An important restriction on recursive builders is disallowing
arbitrary substitutions. For example, running
```
nix-store -r /nix/store/kmwd1hq55akdb9sc7l3finr175dajlby-hello-2.10
```
in the above `runCommand` script would be disallowed, as this could
lead to derivations with hidden dependencies or breaking
reproducibility by relying on the current state of the Nix store. An
exception would be if
`/nix/store/kmwd1hq55akdb9sc7l3finr175dajlby-hello-2.10` were
already in the build inputs or built by a previous recursive Nix
call.
)",
},
{
.tag = Xp::NoUrlLiterals,
.name = "no-url-literals",
.description = R"(
Disallow unquoted URLs as part of the Nix language syntax. The Nix
language allows for URL literals, like so:
```
$ nix repl
Welcome to Nix 2.15.0. Type :? for help.
nix-repl> http://foo
"http://foo"
```
But enabling this experimental feature will cause the Nix parser to
throw an error when encountering a URL literal:
```
$ nix repl --extra-experimental-features 'no-url-literals'
Welcome to Nix 2.15.0. Type :? for help.
nix-repl> http://foo
error: URL literals are disabled
at «string»:1:1:
1| http://foo
| ^
```
While this is currently an experimental feature, unquoted URLs are
being deprecated and their usage is discouraged.
The reason is that, as opposed to path literals, URLs have no
special properties that distinguish them from regular strings, URLs
containing parameters have to be quoted anyway, and unquoted URLs
may confuse external tooling.
)",
},
{
.tag = Xp::FetchClosure,
.name = "fetch-closure",
.description = R"(
Enable the use of the [`fetchClosure`](@docroot@/language/builtins.md#builtins-fetchClosure) built-in function in the Nix language.
)",
},
{
.tag = Xp::ReplFlake,
.name = "repl-flake",
.description = R"(
Allow passing [installables](@docroot@/command-ref/new-cli/nix.md#installables) to `nix repl`, making its interface consistent with the other experimental commands.
)",
},
{
.tag = Xp::AutoAllocateUids,
.name = "auto-allocate-uids",
.description = R"(
Allows Nix to automatically pick UIDs for builds, rather than creating
`nixbld*` user accounts. See the [`auto-allocate-uids`](#conf-auto-allocate-uids) setting for details.
)",
},
{
.tag = Xp::Cgroups,
.name = "cgroups",
.description = R"(
Allows Nix to execute builds inside cgroups. See
the [`use-cgroups`](#conf-use-cgroups) setting for details.
)",
},
{
.tag = Xp::DiscardReferences,
.name = "discard-references",
.description = R"(
Allow the use of the [`unsafeDiscardReferences`](@docroot@/language/advanced-attributes.html#adv-attr-unsafeDiscardReferences) attribute in derivations
that use [structured attributes](@docroot@/language/advanced-attributes.html#adv-attr-structuredAttrs). This disables scanning of outputs for
runtime dependencies.
)",
},
}};
static_assert(
[]() constexpr {
for (auto [index, feature] : enumerate(xpFeatureDetails))
if (index != (size_t)feature.tag)
return false;
return true;
}(),
"array order does not match enum tag order");
const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::string_view & name)
{
using ReverseXpMap = std::map<std::string_view, ExperimentalFeature>;
static auto reverseXpMap = []()
{
static std::unique_ptr<ReverseXpMap> reverseXpMap = []() {
auto reverseXpMap = std::make_unique<ReverseXpMap>();
for (auto & [feature, name] : stringifiedXpFeatures)
(*reverseXpMap)[name] = feature;
for (auto & xpFeature : xpFeatureDetails)
(*reverseXpMap)[xpFeature.name] = xpFeature.tag;
return reverseXpMap;
}();
@ -37,20 +217,27 @@ const std::optional<ExperimentalFeature> parseExperimentalFeature(const std::str
return std::nullopt;
}
std::string_view showExperimentalFeature(const ExperimentalFeature feature)
std::string_view showExperimentalFeature(const ExperimentalFeature tag)
{
const auto ret = get(stringifiedXpFeatures, feature);
assert(ret);
return *ret;
assert((size_t)tag < xpFeatureDetails.size());
return xpFeatureDetails[(size_t)tag].name;
}
nlohmann::json documentExperimentalFeatures()
{
StringMap res;
for (auto & xpFeature : xpFeatureDetails)
res[std::string { xpFeature.name }] =
trim(stripIndentation(xpFeature.description));
return (nlohmann::json) res;
}
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> & rawFeatures)
{
std::set<ExperimentalFeature> res;
for (auto & rawFeature : rawFeatures) {
for (auto & rawFeature : rawFeatures)
if (auto feature = parseExperimentalFeature(rawFeature))
res.insert(*feature);
}
return res;
}

37
src/libutil/experimental-features.hh
View file

@ -11,8 +11,9 @@ namespace nix {
/**
* The list of available experimental features.
*
* If you update this, don’t forget to also change the map defining their
* string representation in the corresponding `.cc` file.
* If you update this, don’t forget to also change the map defining
* their string representation and documentation in the corresponding
* `.cc` file as well.
*/
enum struct ExperimentalFeature
{
@ -34,26 +35,52 @@ enum struct ExperimentalFeature
*/
using Xp = ExperimentalFeature;
/**
* Parse an experimental feature (enum value) from its name. Experimental
* feature flag names are hyphenated and do not contain spaces.
*/
const std::optional<ExperimentalFeature> parseExperimentalFeature(
const std::string_view & name);
/**
* Show the name of an experimental feature. This is the opposite of
* parseExperimentalFeature().
*/
std::string_view showExperimentalFeature(const ExperimentalFeature);
/**
* Compute the documentation of all experimental features.
*
* See `doc/manual` for how this information is used.
*/
nlohmann::json documentExperimentalFeatures();
/**
* Shorthand for `str << showExperimentalFeature(feature)`.
*/
std::ostream & operator<<(
std::ostream & str,
const ExperimentalFeature & feature);
/**
* Parse a set of strings to the corresponding set of experimental features,
* ignoring (but warning for) any unkwown feature.
* Parse a set of strings to the corresponding set of experimental
* features, ignoring (but warning for) any unknown feature.
*/
std::set<ExperimentalFeature> parseFeatures(const std::set<std::string> &);
/**
* An experimental feature was required for some (experimental)
* operation, but was not enabled.
*/
class MissingExperimentalFeature : public Error
{
public:
/**
* The experimental feature that was required but not enabled.
*/
ExperimentalFeature missingFeature;
MissingExperimentalFeature(ExperimentalFeature);
MissingExperimentalFeature(ExperimentalFeature missingFeature);
};
/**

2
src/libutil/hash.cc
View file

@ -343,7 +343,7 @@ HashSink::~HashSink()
delete ctx;
}
void HashSink::write(std::string_view data)
void HashSink::writeUnbuffered(std::string_view data)
{
bytes += data.size();
update(ht, *ctx, data);

2
src/libutil/hash.hh
View file

@ -197,7 +197,7 @@ public:
HashSink(HashType ht);
HashSink(const HashSink & h);
~HashSink();
void write(std::string_view data) override;
void writeUnbuffered(std::string_view data) override;
HashResult finish() override;
HashResult currentHash();
};

5
src/libutil/logging.cc
View file

@ -65,9 +65,10 @@ public:
switch (lvl) {
case lvlError: c = '3'; break;
case lvlWarn: c = '4'; break;
case lvlInfo: c = '5'; break;
case lvlNotice: case lvlInfo: c = '5'; break;
case lvlTalkative: case lvlChatty: c = '6'; break;
default: c = '7';
case lvlDebug: case lvlVomit: c = '7';
default: c = '7'; break; // should not happen, and missing enum case is reported by -Werror=switch-enum
}
prefix = std::string("<") + c + ">";
}

23
src/libutil/logging.hh
View file

@ -183,12 +183,17 @@ bool handleJSONLogMessage(const std::string & msg,
const Activity & act, std::map<ActivityId, Activity> & activities,
bool trusted);
extern Verbosity verbosity; /* suppress msgs > this */
/**
* suppress msgs > this
*/
extern Verbosity verbosity;
/* Print a message with the standard ErrorInfo format.
In general, use these 'log' macros for reporting problems that may require user
intervention or that need more explanation. Use the 'print' macros for more
lightweight status messages. */
/**
* Print a message with the standard ErrorInfo format.
* In general, use these 'log' macros for reporting problems that may require user
* intervention or that need more explanation. Use the 'print' macros for more
* lightweight status messages.
*/
#define logErrorInfo(level, errorInfo...) \
do { \
if ((level) <= nix::verbosity) { \
@ -199,9 +204,11 @@ extern Verbosity verbosity; /* suppress msgs > this */
#define logError(errorInfo...) logErrorInfo(lvlError, errorInfo)
#define logWarning(errorInfo...) logErrorInfo(lvlWarn, errorInfo)
/* Print a string message if the current log level is at least the specified
level. Note that this has to be implemented as a macro to ensure that the
arguments are evaluated lazily. */
/**
* Print a string message if the current log level is at least the specified
* level. Note that this has to be implemented as a macro to ensure that the
* arguments are evaluated lazily.
*/
#define printMsgUsing(loggerParam, level, args...) \
do { \
auto __lvl = level; \

45
src/libutil/serialise.cc
View file

@ -20,7 +20,7 @@ void BufferedSink::operator () (std::string_view data)
buffer size. */
if (bufPos + data.size() >= bufSize) {
flush();
write(data);
writeUnbuffered(data);
break;
}
/* Otherwise, copy the bytes to the buffer. Flush the buffer
@ -38,7 +38,7 @@ void BufferedSink::flush()
if (bufPos == 0) return;
size_t n = bufPos;
bufPos = 0; // don't trigger the assert() in ~BufferedSink()
write({buffer.get(), n});
writeUnbuffered({buffer.get(), n});
}
@ -48,7 +48,7 @@ FdSink::~FdSink()
}
void FdSink::write(std::string_view data)
void FdSink::writeUnbuffered(std::string_view data)
{
written += data.size();
try {
@ -186,6 +186,22 @@ static DefaultStackAllocator defaultAllocatorSingleton;
StackAllocator *StackAllocator::defaultAllocator = &defaultAllocatorSingleton;
std::shared_ptr<void> (*create_coro_gc_hook)() = []() -> std::shared_ptr<void> {
return {};
};
/* This class is used for entry and exit hooks on coroutines */
class CoroutineContext {
/* Disable GC when entering the coroutine without the boehm patch,
* since it doesn't find the main thread stack in this case.
* std::shared_ptr<void> performs type-erasure, so it will call the right
* deleter. */
const std::shared_ptr<void> coro_gc_hook = create_coro_gc_hook();
public:
CoroutineContext() {};
~CoroutineContext() {};
};
std::unique_ptr<FinishSink> sourceToSink(std::function<void(Source &)> fun)
{
struct SourceToSink : FinishSink
@ -206,7 +222,8 @@ std::unique_ptr<FinishSink> sourceToSink(std::function<void(Source &)> fun)
if (in.empty()) return;
cur = in;
if (!coro)
if (!coro) {
CoroutineContext ctx;
coro = coro_t::push_type(VirtualStackAllocator{}, [&](coro_t::pull_type & yield) {
LambdaSource source([&](char *out, size_t out_len) {
if (cur.empty()) {
@ -223,17 +240,24 @@ std::unique_ptr<FinishSink> sourceToSink(std::function<void(Source &)> fun)
});
fun(source);
});
}
if (!*coro) { abort(); }
if (!cur.empty()) (*coro)(false);
if (!cur.empty()) {
CoroutineContext ctx;
(*coro)(false);
}
}
void finish() override
{
if (!coro) return;
if (!*coro) abort();
(*coro)(true);
{
CoroutineContext ctx;
(*coro)(true);
}
if (*coro) abort();
}
};
@ -264,18 +288,23 @@ std::unique_ptr<Source> sinkToSource(
size_t read(char * data, size_t len) override
{
if (!coro)
if (!coro) {
CoroutineContext ctx;
coro = coro_t::pull_type(VirtualStackAllocator{}, [&](coro_t::push_type & yield) {
LambdaSink sink([&](std::string_view data) {
if (!data.empty()) yield(std::string(data));
});
fun(sink);
});
}
if (!*coro) { eof(); abort(); }
if (pos == cur.size()) {
if (!cur.empty()) (*coro)();
if (!cur.empty()) {
CoroutineContext ctx;
(*coro)();
}
cur = coro->get();
pos = 0;
}

14
src/libutil/serialise.hh
View file

@ -53,7 +53,9 @@ struct BufferedSink : virtual Sink
void flush();
virtual void write(std::string_view data) = 0;
protected:
virtual void writeUnbuffered(std::string_view data) = 0;
};
@ -133,7 +135,7 @@ struct FdSink : BufferedSink
~FdSink();
void write(std::string_view data) override;
void writeUnbuffered(std::string_view data) override;
bool good() override;
@ -520,7 +522,7 @@ struct FramedSink : nix::BufferedSink
}
}
void write(std::string_view data) override
void writeUnbuffered(std::string_view data) override
{
/* Don't send more data if the remote has
encountered an error. */
@ -551,4 +553,10 @@ struct StackAllocator {
static StackAllocator *defaultAllocator;
};
/* Disabling GC when entering a coroutine (without the boehm patch).
mutable to avoid boehm gc dependency in libutil.
*/
extern std::shared_ptr<void> (*create_coro_gc_hook)();
}

48
src/libutil/tests/config.cc
View file

@ -156,12 +156,54 @@ namespace nix {
}
TEST(Config, toJSONOnNonEmptyConfig) {
using nlohmann::literals::operator "" _json;
Config config;
std::map<std::string, Config::SettingInfo> settings;
Setting<std::string> setting{&config, "", "name-of-the-setting", "description"};
Setting<std::string> setting{
&config,
"",
"name-of-the-setting",
"description",
};
setting.assign("value");
ASSERT_EQ(config.toJSON().dump(), R"#({"name-of-the-setting":{"aliases":[],"defaultValue":"","description":"description\n","documentDefault":true,"value":"value"}})#");
ASSERT_EQ(config.toJSON(),
R"#({
"name-of-the-setting": {
"aliases": [],
"defaultValue": "",
"description": "description\n",
"documentDefault": true,
"value": "value",
"experimentalFeature": null
}
})#"_json);
}
TEST(Config, toJSONOnNonEmptyConfigWithExperimentalSetting) {
using nlohmann::literals::operator "" _json;
Config config;
Setting<std::string> setting{
&config,
"",
"name-of-the-setting",
"description",
{},
true,
Xp::Flakes,
};
setting.assign("value");
ASSERT_EQ(config.toJSON(),
R"#({
"name-of-the-setting": {
"aliases": [],
"defaultValue": "",
"description": "description\n",
"documentDefault": true,
"value": "value",
"experimentalFeature": "flakes"
}
})#"_json);
}
TEST(Config, setSettingAlias) {

16
src/libutil/thread-pool.hh
View file

@ -40,15 +40,15 @@ public:
/**
* Execute work items until the queue is empty.
*
* \note Note that work items are allowed to add new items to the
* queue; this is handled correctly.
*
* Queue processing stops prematurely if any work item throws an
* exception. This exception is propagated to the calling thread. If
* multiple work items throw an exception concurrently, only one
* item is propagated; the others are printed on stderr and
* otherwise ignored.
* \note Note that work items are allowed to add new items to the
* queue; this is handled correctly.
*
* Queue processing stops prematurely if any work item throws an
* exception. This exception is propagated to the calling thread. If
* multiple work items throw an exception concurrently, only one
* item is propagated; the others are printed on stderr and
* otherwise ignored.
*/
void process();

488
src/libutil/util.hh
View file

@ -33,77 +33,112 @@ struct Sink;
struct Source;
/* The system for which Nix is compiled. */
/**
* The system for which Nix is compiled.
*/
extern const std::string nativeSystem;
/* Return an environment variable. */
/**
* @return an environment variable.
*/
std::optional<std::string> getEnv(const std::string & key);
/* Return a non empty environment variable. Returns nullopt if the env
variable is set to "" */
/**
* @return a non empty environment variable. Returns nullopt if the env
* variable is set to ""
*/
std::optional<std::string> getEnvNonEmpty(const std::string & key);
/* Get the entire environment. */
/**
* Get the entire environment.
*/
std::map<std::string, std::string> getEnv();
/* Clear the environment. */
/**
* Clear the environment.
*/
void clearEnv();
/* Return an absolutized path, resolving paths relative to the
specified directory, or the current directory otherwise. The path
is also canonicalised. */
/**
* @return An absolutized path, resolving paths relative to the
* specified directory, or the current directory otherwise. The path
* is also canonicalised.
*/
Path absPath(Path path,
std::optional<PathView> dir = {},
bool resolveSymlinks = false);
/* Canonicalise a path by removing all `.' or `..' components and
double or trailing slashes. Optionally resolves all symlink
components such that each component of the resulting path is *not*
a symbolic link. */
/**
* Canonicalise a path by removing all `.` or `..` components and
* double or trailing slashes. Optionally resolves all symlink
* components such that each component of the resulting path is *not*
* a symbolic link.
*/
Path canonPath(PathView path, bool resolveSymlinks = false);
/* Return the directory part of the given canonical path, i.e.,
everything before the final `/'. If the path is the root or an
immediate child thereof (e.g., `/foo'), this means `/'
is returned.*/
/**
* @return The directory part of the given canonical path, i.e.,
* everything before the final `/`. If the path is the root or an
* immediate child thereof (e.g., `/foo`), this means `/`
* is returned.
*/
Path dirOf(const PathView path);
/* Return the base name of the given canonical path, i.e., everything
following the final `/' (trailing slashes are removed). */
/**
* @return the base name of the given canonical path, i.e., everything
* following the final `/` (trailing slashes are removed).
*/
std::string_view baseNameOf(std::string_view path);
/* Perform tilde expansion on a path. */
/**
* Perform tilde expansion on a path.
*/
std::string expandTilde(std::string_view path);
/* Check whether 'path' is a descendant of 'dir'. Both paths must be
canonicalized. */
/**
* Check whether 'path' is a descendant of 'dir'. Both paths must be
* canonicalized.
*/
bool isInDir(std::string_view path, std::string_view dir);
/* Check whether 'path' is equal to 'dir' or a descendant of
'dir'. Both paths must be canonicalized. */
/**
* Check whether 'path' is equal to 'dir' or a descendant of
* 'dir'. Both paths must be canonicalized.
*/
bool isDirOrInDir(std::string_view path, std::string_view dir);
/* Get status of `path'. */
/**
* Get status of `path`.
*/
struct stat stat(const Path & path);
struct stat lstat(const Path & path);
/* Return true iff the given path exists. */
/**
* @return true iff the given path exists.
*/
bool pathExists(const Path & path);
/* Read the contents (target) of a symbolic link. The result is not
in any way canonicalised. */
/**
* Read the contents (target) of a symbolic link. The result is not
* in any way canonicalised.
*/
Path readLink(const Path & path);
bool isLink(const Path & path);
/* Read the contents of a directory. The entries `.' and `..' are
removed. */
/**
* Read the contents of a directory. The entries `.` and `..` are
* removed.
*/
struct DirEntry
{
std::string name;
ino_t ino;
unsigned char type; // one of DT_*
/**
* one of DT_*
*/
unsigned char type;
DirEntry(std::string name, ino_t ino, unsigned char type)
: name(std::move(name)), ino(ino), type(type) { }
};
@ -114,74 +149,110 @@ DirEntries readDirectory(const Path & path);
unsigned char getFileType(const Path & path);
/* Read the contents of a file into a string. */
/**
* Read the contents of a file into a string.
*/
std::string readFile(int fd);
std::string readFile(const Path & path);
void readFile(const Path & path, Sink & sink);
/* Write a string to a file. */
/**
* Write a string to a file.
*/
void writeFile(const Path & path, std::string_view s, mode_t mode = 0666, bool sync = false);
void writeFile(const Path & path, Source & source, mode_t mode = 0666, bool sync = false);
/* Flush a file's parent directory to disk */
/**
* Flush a file's parent directory to disk
*/
void syncParent(const Path & path);
/* Read a line from a file descriptor. */
/**
* Read a line from a file descriptor.
*/
std::string readLine(int fd);
/* Write a line to a file descriptor. */
/**
* Write a line to a file descriptor.
*/
void writeLine(int fd, std::string s);
/* Delete a path; i.e., in the case of a directory, it is deleted
recursively. It's not an error if the path does not exist. The
second variant returns the number of bytes and blocks freed. */
/**
* Delete a path; i.e., in the case of a directory, it is deleted
* recursively. It's not an error if the path does not exist. The
* second variant returns the number of bytes and blocks freed.
*/
void deletePath(const Path & path);
void deletePath(const Path & path, uint64_t & bytesFreed);
std::string getUserName();
/* Return the given user's home directory from /etc/passwd. */
/**
* @return the given user's home directory from /etc/passwd.
*/
Path getHomeOf(uid_t userId);
/* Return $HOME or the user's home directory from /etc/passwd. */
/**
* @return $HOME or the user's home directory from /etc/passwd.
*/
Path getHome();
/* Return $XDG_CACHE_HOME or $HOME/.cache. */
/**
* @return $XDG_CACHE_HOME or $HOME/.cache.
*/
Path getCacheDir();
/* Return $XDG_CONFIG_HOME or $HOME/.config. */
/**
* @return $XDG_CONFIG_HOME or $HOME/.config.
*/
Path getConfigDir();
/* Return the directories to search for user configuration files */
/**
* @return the directories to search for user configuration files
*/
std::vector<Path> getConfigDirs();
/* Return $XDG_DATA_HOME or $HOME/.local/share. */
/**
* @return $XDG_DATA_HOME or $HOME/.local/share.
*/
Path getDataDir();
/* Return the path of the current executable. */
/**
* @return the path of the current executable.
*/
std::optional<Path> getSelfExe();
/* Return $XDG_STATE_HOME or $HOME/.local/state. */
/**
* @return $XDG_STATE_HOME or $HOME/.local/state.
*/
Path getStateDir();
/* Create the Nix state directory and return the path to it. */
/**
* Create the Nix state directory and return the path to it.
*/
Path createNixStateDir();
/* Create a directory and all its parents, if necessary. Returns the
list of created directories, in order of creation. */
/**
* Create a directory and all its parents, if necessary. Returns the
* list of created directories, in order of creation.
*/
Paths createDirs(const Path & path);
inline Paths createDirs(PathView path)
{
return createDirs(Path(path));
}
/* Create a symlink. */
/**
* Create a symlink.
*/
void createSymlink(const Path & target, const Path & link,
std::optional<time_t> mtime = {});
/* Atomically create or replace a symlink. */
/**
* Atomically create or replace a symlink.
*/
void replaceSymlink(const Path & target, const Path & link,
std::optional<time_t> mtime = {});
@ -197,24 +268,32 @@ void renameFile(const Path & src, const Path & dst);
void moveFile(const Path & src, const Path & dst);
/* Wrappers arount read()/write() that read/write exactly the
requested number of bytes. */
/**
* Wrappers arount read()/write() that read/write exactly the
* requested number of bytes.
*/
void readFull(int fd, char * buf, size_t count);
void writeFull(int fd, std::string_view s, bool allowInterrupts = true);
MakeError(EndOfFile, Error);
/* Read a file descriptor until EOF occurs. */
/**
* Read a file descriptor until EOF occurs.
*/
std::string drainFD(int fd, bool block = true, const size_t reserveSize=0);
void drainFD(int fd, Sink & sink, bool block = true);
/* If cgroups are active, attempt to calculate the number of CPUs available.
If cgroups are unavailable or if cpu.max is set to "max", return 0. */
/**
* If cgroups are active, attempt to calculate the number of CPUs available.
* If cgroups are unavailable or if cpu.max is set to "max", return 0.
*/
unsigned int getMaxCPU();
/* Automatic cleanup of resources. */
/**
* Automatic cleanup of resources.
*/
class AutoDelete
@ -252,11 +331,15 @@ public:
};
/* Create a temporary directory. */
/**
* Create a temporary directory.
*/
Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
bool includePid = true, bool useGlobalCounter = true, mode_t mode = 0755);
/* Create a temporary file, returning a file handle and its path. */
/**
* Create a temporary file, returning a file handle and its path.
*/
std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix = "nix");
@ -299,27 +382,36 @@ public:
};
/* Kill all processes running under the specified uid by sending them
a SIGKILL. */
/**
* Kill all processes running under the specified uid by sending them
* a SIGKILL.
*/
void killUser(uid_t uid);
/* Fork a process that runs the given function, and return the child
pid to the caller. */
/**
* Fork a process that runs the given function, and return the child
* pid to the caller.
*/
struct ProcessOptions
{
std::string errorPrefix = "";
bool dieWithParent = true;
bool runExitHandlers = false;
bool allowVfork = false;
int cloneFlags = 0; // use clone() with the specified flags (Linux only)
/**
* use clone() with the specified flags (Linux only)
*/
int cloneFlags = 0;
};
pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = ProcessOptions());
/* Run a program and return its stdout in a string (i.e., like the
shell backtick operator). */
/**
* Run a program and return its stdout in a string (i.e., like the
* shell backtick operator).
*/
std::string runProgram(Path program, bool searchPath = false,
const Strings & args = Strings(),
const std::optional<std::string> & input = {});
@ -344,25 +436,35 @@ std::pair<int, std::string> runProgram(RunOptions && options);
void runProgram2(const RunOptions & options);
/* Change the stack size. */
/**
* Change the stack size.
*/
void setStackSize(size_t stackSize);
/* Restore the original inherited Unix process context (such as signal
masks, stack size). */
/**
* Restore the original inherited Unix process context (such as signal
* masks, stack size).
*/
void restoreProcessContext(bool restoreMounts = true);
/* Save the current mount namespace. Ignored if called more than
once. */
/**
* Save the current mount namespace. Ignored if called more than
* once.
*/
void saveMountNamespace();
/* Restore the mount namespace saved by saveMountNamespace(). Ignored
if saveMountNamespace() was never called. */
/**
* Restore the mount namespace saved by saveMountNamespace(). Ignored
* if saveMountNamespace() was never called.
*/
void restoreMountNamespace();
/* Cause this thread to not share any FS attributes with the main
thread, because this causes setns() in restoreMountNamespace() to
fail. */
/**
* Cause this thread to not share any FS attributes with the main
* thread, because this causes setns() in restoreMountNamespace() to
* fail.
*/
void unshareFilesystem();
@ -377,16 +479,22 @@ public:
{ }
};
/* Convert a list of strings to a null-terminated vector of char
*'s. The result must not be accessed beyond the lifetime of the
list of strings. */
/**
* Convert a list of strings to a null-terminated vector of `char
* *`s. The result must not be accessed beyond the lifetime of the
* list of strings.
*/
std::vector<char *> stringsToCharPtrs(const Strings & ss);
/* Close all file descriptors except those listed in the given set.
Good practice in child processes. */
/**
* Close all file descriptors except those listed in the given set.
* Good practice in child processes.
*/
void closeMostFDs(const std::set<int> & exceptions);
/* Set the close-on-exec flag for the given file descriptor. */
/**
* Set the close-on-exec flag for the given file descriptor.
*/
void closeOnExec(int fd);
@ -412,12 +520,16 @@ MakeError(Interrupted, BaseError);
MakeError(FormatError, Error);
/* String tokenizer. */
/**
* String tokenizer.
*/
template<class C> C tokenizeString(std::string_view s, std::string_view separators = " \t\n\r");
/* Concatenate the given strings with a separator between the
elements. */
/**
* Concatenate the given strings with a separator between the
* elements.
*/
template<class C>
std::string concatStringsSep(const std::string_view sep, const C & ss)
{
@ -442,7 +554,9 @@ auto concatStrings(Parts && ... parts)
}
/* Add quotes around a collection of strings. */
/**
* Add quotes around a collection of strings.
*/
template<class C> Strings quoteStrings(const C & c)
{
Strings res;
@ -451,16 +565,23 @@ template<class C> Strings quoteStrings(const C & c)
return res;
}
/* Remove trailing whitespace from a string. FIXME: return
std::string_view. */
/**
* Remove trailing whitespace from a string.
*
* \todo return std::string_view.
*/
std::string chomp(std::string_view s);
/* Remove whitespace from the start and end of a string. */
/**
* Remove whitespace from the start and end of a string.
*/
std::string trim(std::string_view s, std::string_view whitespace = " \n\r\t");
/* Replace all occurrences of a string inside another string. */
/**
* Replace all occurrences of a string inside another string.
*/
std::string replaceStrings(
std::string s,
std::string_view from,
@ -470,14 +591,18 @@ std::string replaceStrings(
std::string rewriteStrings(std::string s, const StringMap & rewrites);
/* Convert the exit status of a child as returned by wait() into an
error string. */
/**
* Convert the exit status of a child as returned by wait() into an
* error string.
*/
std::string statusToString(int status);
bool statusOk(int status);
/* Parse a string into an integer. */
/**
* Parse a string into an integer.
*/
template<class N>
std::optional<N> string2Int(const std::string_view s)
{
@ -490,8 +615,10 @@ std::optional<N> string2Int(const std::string_view s)
}
}
/* Like string2Int(), but support an optional suffix 'K', 'M', 'G' or
'T' denoting a binary unit prefix. */
/**
* Like string2Int(), but support an optional suffix 'K', 'M', 'G' or
* 'T' denoting a binary unit prefix.
*/
template<class N>
N string2IntWithUnitPrefix(std::string_view s)
{
@ -512,7 +639,9 @@ N string2IntWithUnitPrefix(std::string_view s)
throw UsageError("'%s' is not an integer", s);
}
/* Parse a string into a float. */
/**
* Parse a string into a float.
*/
template<class N>
std::optional<N> string2Float(const std::string_view s)
{
@ -524,7 +653,9 @@ std::optional<N> string2Float(const std::string_view s)
}
/* Convert a little-endian integer to host order. */
/**
* Convert a little-endian integer to host order.
*/
template<typename T>
T readLittleEndian(unsigned char * p)
{
@ -536,66 +667,90 @@ T readLittleEndian(unsigned char * p)
}
/* Return true iff `s' starts with `prefix'. */
/**
* @return true iff `s` starts with `prefix`.
*/
bool hasPrefix(std::string_view s, std::string_view prefix);
/* Return true iff `s' ends in `suffix'. */
/**
* @return true iff `s` ends in `suffix`.
*/
bool hasSuffix(std::string_view s, std::string_view suffix);
/* Convert a string to lower case. */
/**
* Convert a string to lower case.
*/
std::string toLower(const std::string & s);
/* Escape a string as a shell word. */
/**
* Escape a string as a shell word.
*/
std::string shellEscape(const std::string_view s);
/* Exception handling in destructors: print an error message, then
ignore the exception. */
/**
* Exception handling in destructors: print an error message, then
* ignore the exception.
*/
void ignoreException(Verbosity lvl = lvlError);
/* Tree formatting. */
/**
* Tree formatting.
*/
constexpr char treeConn[] = "├───";
constexpr char treeLast[] = "└───";
constexpr char treeLine[] = "│ ";
constexpr char treeNull[] = " ";
/* Determine whether ANSI escape sequences are appropriate for the
present output. */
/**
* Determine whether ANSI escape sequences are appropriate for the
* present output.
*/
bool shouldANSI();
/* Truncate a string to 'width' printable characters. If 'filterAll'
is true, all ANSI escape sequences are filtered out. Otherwise,
some escape sequences (such as colour setting) are copied but not
included in the character count. Also, tabs are expanded to
spaces. */
/**
* Truncate a string to 'width' printable characters. If 'filterAll'
* is true, all ANSI escape sequences are filtered out. Otherwise,
* some escape sequences (such as colour setting) are copied but not
* included in the character count. Also, tabs are expanded to
* spaces.
*/
std::string filterANSIEscapes(std::string_view s,
bool filterAll = false,
unsigned int width = std::numeric_limits<unsigned int>::max());
/* Base64 encoding/decoding. */
/**
* Base64 encoding/decoding.
*/
std::string base64Encode(std::string_view s);
std::string base64Decode(std::string_view s);
/* Remove common leading whitespace from the lines in the string
's'. For example, if every line is indented by at least 3 spaces,
then we remove 3 spaces from the start of every line. */
/**
* Remove common leading whitespace from the lines in the string
* 's'. For example, if every line is indented by at least 3 spaces,
* then we remove 3 spaces from the start of every line.
*/
std::string stripIndentation(std::string_view s);
/* Get the prefix of 's' up to and excluding the next line break (LF
optionally preceded by CR), and the remainder following the line
break. */
/**
* Get the prefix of 's' up to and excluding the next line break (LF
* optionally preceded by CR), and the remainder following the line
* break.
*/
std::pair<std::string_view, std::string_view> getLine(std::string_view s);
/* Get a value for the specified key from an associate container. */
/**
* Get a value for the specified key from an associate container.
*/
template <class T>
const typename T::mapped_type * get(const T & map, const typename T::key_type & key)
{
@ -612,7 +767,9 @@ typename T::mapped_type * get(T & map, const typename T::key_type & key)
return &i->second;
}
/* Get a value for the specified key from an associate container, or a default value if the key isn't present. */
/**
* Get a value for the specified key from an associate container, or a default value if the key isn't present.
*/
template <class T>
const typename T::mapped_type & getOr(T & map,
const typename T::key_type & key,
@ -623,7 +780,9 @@ const typename T::mapped_type & getOr(T & map,
return i->second;
}
/* Remove and return the first item from a container. */
/**
* Remove and return the first item from a container.
*/
template <class T>
std::optional<typename T::value_type> remove_begin(T & c)
{
@ -635,7 +794,9 @@ std::optional<typename T::value_type> remove_begin(T & c)
}
/* Remove and return the first item from a container. */
/**
* Remove and return the first item from a container.
*/
template <class T>
std::optional<typename T::value_type> pop(T & c)
{
@ -650,8 +811,10 @@ template<typename T>
class Callback;
/* Start a thread that handles various signals. Also block those signals
on the current thread (and thus any threads created by it). */
/**
* Start a thread that handles various signals. Also block those signals
* on the current thread (and thus any threads created by it).
*/
void startSignalHandlerThread();
struct InterruptCallback
@ -659,16 +822,20 @@ struct InterruptCallback
virtual ~InterruptCallback() { };
};
/* Register a function that gets called on SIGINT (in a non-signal
context). */
/**
* Register a function that gets called on SIGINT (in a non-signal
* context).
*/
std::unique_ptr<InterruptCallback> createInterruptCallback(
std::function<void()> callback);
void triggerInterrupt();
/* A RAII class that causes the current thread to receive SIGUSR1 when
the signal handler thread receives SIGINT. That is, this allows
SIGINT to be multiplexed to multiple threads. */
/**
* A RAII class that causes the current thread to receive SIGUSR1 when
* the signal handler thread receives SIGINT. That is, this allows
* SIGINT to be multiplexed to multiple threads.
*/
struct ReceiveInterrupts
{
pthread_t target;
@ -682,8 +849,10 @@ struct ReceiveInterrupts
/* A RAII helper that increments a counter on construction and
decrements it on destruction. */
/**
* A RAII helper that increments a counter on construction and
* decrements it on destruction.
*/
template<typename T>
struct MaintainCount
{
@ -694,33 +863,50 @@ struct MaintainCount
};
/* Return the number of rows and columns of the terminal. */
/**
* @return the number of rows and columns of the terminal.
*/
std::pair<unsigned short, unsigned short> getWindowSize();
/* Used in various places. */
/**
* Used in various places.
*/
typedef std::function<bool(const Path & path)> PathFilter;
extern PathFilter defaultPathFilter;
/* Common initialisation performed in child processes. */
/**
* Common initialisation performed in child processes.
*/
void commonChildInit();
/* Create a Unix domain socket. */
/**
* Create a Unix domain socket.
*/
AutoCloseFD createUnixDomainSocket();
/* Create a Unix domain socket in listen mode. */
/**
* Create a Unix domain socket in listen mode.
*/
AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode);
/* Bind a Unix domain socket to a path. */
/**
* Bind a Unix domain socket to a path.
*/
void bind(int fd, const std::string & path);
/* Connect to a Unix domain socket. */
/**
* Connect to a Unix domain socket.
*/
void connect(int fd, const std::string & path);
// A Rust/Python-like enumerate() iterator adapter.
// Borrowed from http://reedbeta.com/blog/python-like-enumerate-in-cpp17.
/**
* A Rust/Python-like enumerate() iterator adapter.
*
* Borrowed from http://reedbeta.com/blog/python-like-enumerate-in-cpp17.
*/
template <typename T,
typename TIter = decltype(std::begin(std::declval<T>())),
typename = decltype(std::end(std::declval<T>()))>
@ -730,23 +916,25 @@ constexpr auto enumerate(T && iterable)
{
size_t i;
TIter iter;
bool operator != (const iterator & other) const { return iter != other.iter; }
void operator ++ () { ++i; ++iter; }
auto operator * () const { return std::tie(i, *iter); }
constexpr bool operator != (const iterator & other) const { return iter != other.iter; }
constexpr void operator ++ () { ++i; ++iter; }
constexpr auto operator * () const { return std::tie(i, *iter); }
};
struct iterable_wrapper
{
T iterable;
auto begin() { return iterator{ 0, std::begin(iterable) }; }
auto end() { return iterator{ 0, std::end(iterable) }; }
constexpr auto begin() { return iterator{ 0, std::begin(iterable) }; }
constexpr auto end() { return iterator{ 0, std::end(iterable) }; }
};
return iterable_wrapper{ std::forward<T>(iterable) };
}
// C++17 std::visit boilerplate
/**
* C++17 std::visit boilerplate
*/
template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
@ -754,8 +942,10 @@ template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
std::string showBytes(uint64_t bytes);
/* Provide an addition operator between strings and string_views
inexplicably omitted from the standard library. */
/**
* Provide an addition operator between strings and string_views
* inexplicably omitted from the standard library.
*/
inline std::string operator + (const std::string & s1, std::string_view s2)
{
auto s = s1;