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libutil: implement copyNAR with parse + dump

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Change-Id: I2bf6a0dc052d2f4012cc8fe3ced4c8cefd6572e5
This commit is contained in:
eldritch horrors
2025-02-27 23:51:06 +00:00
parent e72f40aa5f
commit 45be1e8d66
1 changed files with 12 additions and 24 deletions
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lix/libutil/archive.cc
+12 -24
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@@ -551,30 +551,18 @@ WireFormatGenerator copyNAR(Source & source)
// FIXME: if 'source' is the output of dumpPath() followed by EOF,
// we should just forward all data directly without parsing.
struct DiscardVisitor : NARParseVisitor
{
struct MyFileHandle : FileHandle
{
void close() override {}
void receiveContents(std::string_view data) override {}
};
box_ptr<NARParseVisitor> createDirectory(const Path & path) override
{
return make_box_ptr<DiscardVisitor>();
}
box_ptr<FileHandle> createRegularFile(const Path & path, uint64_t size, bool executable) override
{
return make_box_ptr<MyFileHandle>();
}
void createSymlink(const Path & path, const std::string & target) override {}
};
static DiscardVisitor parseSink; /* null sink; just parse the NAR */
return parseAndCopyDump(parseSink, source);
auto items = nar::parse(source);
co_yield narVersionMagic1;
while (auto e = items.next()) {
co_yield std::visit(
overloaded{
[](nar::MetadataString &) -> WireFormatGenerator { co_return; },
[](nar::MetadataRaw &) -> WireFormatGenerator { co_return; },
[](auto & i) { return dump(std::move(i)); },
},
*e
);
}
}
}