forked from lix-project/lix
105 lines
2.4 KiB
C++
105 lines
2.4 KiB
C++
#pragma once
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#include "types.hh"
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#include "serialise.hh"
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namespace nix {
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/* dumpPath creates a Nix archive of the specified path. The format
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is as follows:
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IF path points to a REGULAR FILE:
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dump(path) = attrs(
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[ ("type", "regular")
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, ("contents", contents(path))
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])
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IF path points to a DIRECTORY:
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dump(path) = attrs(
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[ ("type", "directory")
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, ("entries", concat(map(f, sort(entries(path)))))
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])
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where f(fn) = attrs(
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[ ("name", fn)
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, ("file", dump(path + "/" + fn))
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])
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where:
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attrs(as) = concat(map(attr, as)) + encN(0)
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attrs((a, b)) = encS(a) + encS(b)
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encS(s) = encN(len(s)) + s + (padding until next 64-bit boundary)
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encN(n) = 64-bit little-endian encoding of n.
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contents(path) = the contents of a regular file.
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sort(strings) = lexicographic sort by 8-bit value (strcmp).
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entries(path) = the entries of a directory, without `.' and
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`..'.
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`+' denotes string concatenation. */
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void dumpPath(const Path & path, Sink & sink,
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PathFilter & filter = defaultPathFilter);
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void dumpString(std::string_view s, Sink & sink);
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/* FIXME: fix this API, it sucks. */
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struct ParseSink
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{
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virtual void createDirectory(const Path & path) { };
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virtual void createRegularFile(const Path & path) { };
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virtual void isExecutable() { };
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virtual void preallocateContents(uint64_t size) { };
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virtual void receiveContents(std::string_view data) { };
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virtual void createSymlink(const Path & path, const std::string & target) { };
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};
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/* If the NAR archive contains a single file at top-level, then save
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the contents of the file to `s'. Otherwise barf. */
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struct RetrieveRegularNARSink : ParseSink
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{
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bool regular = true;
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Sink & sink;
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RetrieveRegularNARSink(Sink & sink) : sink(sink) { }
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void createDirectory(const Path & path) override
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{
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regular = false;
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}
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void receiveContents(std::string_view data) override
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{
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sink(data);
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}
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void createSymlink(const Path & path, const std::string & target) override
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{
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regular = false;
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}
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};
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void parseDump(ParseSink & sink, Source & source);
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void restorePath(const Path & path, Source & source);
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/* Read a NAR from 'source' and write it to 'sink'. */
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void copyNAR(Source & source, Sink & sink);
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void copyPath(const Path & from, const Path & to);
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extern const std::string narVersionMagic1;
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}
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