forked from lix-project/lix
737ed88f35
Allow global config settings to be defined in multiple Config classes. For example, this means that libutil can have settings and evaluator settings can be moved out of libstore. The Config classes are registered in a new GlobalConfig class to which config files etc. are applied. Relevant to https://github.com/NixOS/nix/issues/2009 in that it removes the need for ad hoc handling of useCaseHack, which was the underlying cause of that issue.
85 lines
1.9 KiB
C++
85 lines
1.9 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(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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{
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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 string & target) { };
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};
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struct TeeSink : ParseSink
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{
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TeeSource source;
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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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extern const std::string narVersionMagic1;
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}
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