author | František Kučera <franta-hg@frantovo.cz> |
Wed, 16 Jan 2019 19:31:37 +0100 | |
branch | v_0 |
changeset 9 | b4f29fb16159 |
parent 8 | eb1ecb37c6b7 |
child 13 | b0fabeceb18a |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <vector> |
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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#include <filesystem> |
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read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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#include <relpipe/writer/typedefs.h> |
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#include <relpipe/writer/AttributeMetadata.h> |
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#include <relpipe/writer/RelationalWriter.h> |
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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#include "RequestedField.h" |
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namespace relpipe { |
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namespace in { |
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namespace filesystem { |
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read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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namespace fs = std::filesystem; |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
František Kučera <franta-hg@frantovo.cz>
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using namespace relpipe::writer; |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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class XattrAttributeFinder : public AttributeFinder { |
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private: |
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
František Kučera <franta-hg@frantovo.cz>
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std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings. |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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string_t getXattr(const fs::path& file, const string_t& attributeName) { |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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// TODO: review, test on multiple platforms |
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// TODO: improve documentation in xattr.h in glibc |
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// TODO: check XATTR_NAME_MAX in limits.h and if it is reasonably small on our system, allocate buffer for it instead of reading twice |
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// TODO: avoid race condition (another process might change the attribute between reading its length and its value) |
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
František Kučera <franta-hg@frantovo.cz>
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ssize_t length = getxattr(file.c_str(), convertor.to_bytes(attributeName).c_str(), nullptr, 0); |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
František Kučera <franta-hg@frantovo.cz>
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if (length > 0) { |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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std::vector<char> buffer(length + 1); |
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getxattr(file.c_str(), convertor.to_bytes(attributeName).c_str(), buffer.data(), buffer.size()); |
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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return convertor.from_bytes(buffer.data()); |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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} else { |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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return L""; |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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} |
f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
František Kučera <franta-hg@frantovo.cz>
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} |
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b4f29fb16159
process also links to non-existent files and non-readable links
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protected: |
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process also links to non-existent files and non-readable links
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virtual void writeFieldOfExistingFile(RelationalWriter* writer, const RequestedField& field) override { |
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for (string_t alias : field.getAliases()) { |
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if (field.group == RequestedField::GROUP_XATTR) writer->writeAttribute(getXattr(currentFile, field.name)); |
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process also links to non-existent files and non-readable links
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} |
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process also links to non-existent files and non-readable links
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parents:
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} |
b4f29fb16159
process also links to non-existent files and non-readable links
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public: |
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virtual vector<AttributeMetadata> toMetadata(const RequestedField& field) override { |
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support field aliases
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if (field.group == RequestedField::GROUP_XATTR) { |
ec661baf433a
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vector<AttributeMetadata> metadata; |
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for (string_t alias : field.getAliases()) metadata.push_back(AttributeMetadata{alias, TypeId::STRING}); |
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return metadata; |
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} else { |
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return {}; |
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} |
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} |
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f07ed604a0ab
read filenames separated by a null-byte; fetch their size, owner, group… and some xattr (extended attribute); a preview version
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virtual ~XattrAttributeFinder() override { |
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} |
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}; |
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} |
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} |
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} |