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

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This commit is contained in:
Eelco Dolstra 2020-07-10 20:58:02 +02:00
parent 400f1a9b59
commit fc84c358d9
9 changed files with 120 additions and 87 deletions
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13
src/libutil/serialise.hh
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@ -166,6 +166,19 @@ struct StringSource : Source
};
/* A sink that writes all incoming data to two other sinks. */
struct TeeSink : Sink
{
Sink & sink1, & sink2;
TeeSink(Sink & sink1, Sink & sink2) : sink1(sink1), sink2(sink2) { }
virtual void operator () (const unsigned char * data, size_t len)
{
sink1(data, len);
sink2(data, len);
}
};
/* Adapter class of a Source that saves all data read to `s'. */
struct TeeSource : Source
{