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Make 'nix copy' to s3:// binary caches run in constant memory

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This commit is contained in:
Eelco Dolstra 2020-07-13 20:07:19 +02:00
parent 493961b689
commit 7c2fef0a81
6 changed files with 57 additions and 27 deletions
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23
src/libutil/serialise.hh
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@ -349,4 +349,27 @@ Source & operator >> (Source & in, bool & b)
}
/* An adapter that converts a std::basic_istream into a source. */
struct StreamToSourceAdapter : Source
{
std::shared_ptr<std::basic_istream<char>> istream;
StreamToSourceAdapter(std::shared_ptr<std::basic_istream<char>> istream)
: istream(istream)
{ }
size_t read(unsigned char * data, size_t len) override
{
if (!istream->read((char *) data, len)) {
if (istream->eof()) {
if (istream->gcount() == 0)
throw EndOfFile("end of file");
} else
throw Error("I/O error in StreamToSourceAdapter");
}
return istream->gcount();
}
};
}