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Sparse files in tars are a GNU extension that libarchive will use if it detects holes in the input file, even when using the standard pax/paxr formats. Not all tar implementations can handle sparse files; in particular, the internal implementation dpkg uses to extract packages can't. To maximize archive portability, turn this feature off by clearing the sparseness information from archive entries.
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2010 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#ifndef cmArchiveWrite_h
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#define cmArchiveWrite_h
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#include "cmStandardIncludes.h"
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#if !defined(CMAKE_BUILD_WITH_CMAKE)
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# error "cmArchiveWrite not allowed during bootstrap build!"
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#endif
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/** \class cmArchiveWrite
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* \brief Wrapper around libarchive for writing.
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*
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*/
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class cmArchiveWrite
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{
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typedef void (cmArchiveWrite::* safe_bool)();
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void safe_bool_true() {}
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public:
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/** Compression type. */
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enum Compress
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{
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CompressNone,
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CompressCompress,
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CompressGZip,
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CompressBZip2,
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CompressLZMA,
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CompressXZ
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};
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/** Construct with output stream to which to write archive. */
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cmArchiveWrite(std::ostream& os, Compress c = CompressNone,
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std::string const& format = "paxr");
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~cmArchiveWrite();
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/**
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* Add a path (file or directory) to the archive. Directories are
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* added recursively. The "path" must be readable on disk, either
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* full path or relative to current working directory. The "skip"
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* value indicates how many leading bytes from the input path to
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* skip. The remaining part of the input path is appended to the
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* "prefix" value to construct the final name in the archive.
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*/
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bool Add(std::string path, size_t skip = 0, const char* prefix = 0);
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/** Returns true if there has been no error. */
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operator safe_bool() const
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{ return this->Okay()? &cmArchiveWrite::safe_bool_true : 0; }
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/** Returns true if there has been an error. */
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bool operator!() const { return !this->Okay(); }
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/** Return the error string; empty if none. */
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std::string GetError() const { return this->Error; }
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// TODO: More general callback instead of hard-coding calls to
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// std::cout.
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void SetVerbose(bool v) { this->Verbose = v; }
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void SetMTime(std::string const& t) { this->MTime = t; }
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private:
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bool Okay() const { return this->Error.empty(); }
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bool AddPath(const char* path, size_t skip, const char* prefix);
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bool AddFile(const char* file, size_t skip, const char* prefix);
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bool AddData(const char* file, size_t size);
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struct Callback;
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friend struct Callback;
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class Entry;
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std::ostream& Stream;
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struct archive* Archive;
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struct archive* Disk;
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bool Verbose;
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std::string Format;
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std::string Error;
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std::string MTime;
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};
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#endif
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