381ce8a666
Make all static std::strings constexpr std::string_views, and replace concatenation with absl::StrCat where necessary. Technically all of these are constant, so they really don't need to be top-level statics - and since I'm trying to get rid of as much global state as possible in preparation for making the nix daemon properly multithreaded I figured I'd knock these out while I was at it. Change-Id: Ibd3ad9ef68f0a0eacb135541b39fdb13dae042e1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/1939 Tested-by: BuildkiteCI Reviewed-by: tazjin <mail@tazj.in>
77 lines
2 KiB
C++
77 lines
2 KiB
C++
#pragma once
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#include "libutil/serialise.hh"
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#include "libutil/types.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(const std::string& s, Sink& sink);
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/* FIXME: fix this API, it sucks. */
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struct ParseSink {
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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(unsigned long long size){};
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virtual void receiveContents(unsigned char* data, unsigned int len){};
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virtual void createSymlink(const Path& path, const std::string& target){};
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};
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struct TeeSink : ParseSink {
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TeeSource source;
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explicit TeeSink(Source& source) : source(source) {}
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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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constexpr std::string_view kNarVersionMagic1 = "nix-archive-1";
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} // namespace nix
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