276a40b31f
When running NixOps under Mac OS X, we need to be able to import store
paths built on Linux into the local Nix store. However, HFS+ is
usually case-insensitive, so if there are directories with file names
that differ only in case, then importing will fail.
The solution is to add a suffix ("~nix~case~hack~<integer>") to
colliding files. For instance, if we have a directory containing
xt_CONNMARK.h and xt_connmark.h, then the latter will be renamed to
"xt_connmark.h~nix~case~hack~1". If a store path is dumped as a NAR,
the suffixes are removed. Thus, importing and exporting via a
case-insensitive Nix store is round-tripping. So when NixOps calls
nix-copy-closure to copy the path to a Linux machine, you get the
original file names back.
Closes #119.
79 lines
1.8 KiB
C++
79 lines
1.8 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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struct PathFilter
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{
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virtual ~PathFilter() { }
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virtual bool operator () (const Path & path) { return true; }
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};
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extern PathFilter defaultPathFilter;
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void dumpPath(const Path & path, Sink & sink,
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PathFilter & filter = defaultPathFilter);
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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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void parseDump(ParseSink & sink, Source & source);
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void restorePath(const Path & path, Source & source);
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// FIXME: global variables are bad m'kay.
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extern bool useCaseHack;
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}
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