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521e6235b5
This replaces usages of `llvm::fs` and string manipulation with `std::filesystem`, also replacing `std::string` with `std::filesystem::path` where it made sense. Moreover MD5 hashing used in macOS file remapping was replaced by SHA256 hashing using a small header-only SHA256 C++ library with an MIT license, https://github.com/okdshin/PicoSHA2. File contents hashing was relocated to the newly created `file` library for later planned reuse.
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
#pragma once
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#include <string>
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#include <fstream>
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#include <optional>
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#include <cerrno>
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#include <filesystem>
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namespace codeql {
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// Only the first process trying to create a `TargetFile` for a given `target` is allowed to do
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// so, all others will have `create` return `std::nullopt`.
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// The content streamed to the `TargetFile` is written to `workingDir/target`, and is moved onto
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// `targetDir/target` on destruction.
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class TargetFile {
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std::filesystem::path workingPath;
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std::filesystem::path targetPath;
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std::ofstream out;
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public:
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static std::optional<TargetFile> create(const std::filesystem::path& target,
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const std::filesystem::path& targetDir,
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const std::filesystem::path& workingDir);
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~TargetFile() { commit(); }
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TargetFile(TargetFile&& other) = default;
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// move assignment deleted as non-trivial and not needed
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TargetFile& operator=(TargetFile&& other) = delete;
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template <typename T>
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TargetFile& operator<<(T&& value) {
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errno = 0;
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out << value;
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checkOutput("write to file");
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return *this;
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}
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private:
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TargetFile(const std::filesystem::path& target,
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const std::filesystem::path& targetDir,
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const std::filesystem::path& workingDir);
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bool init();
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void checkOutput(const char* action);
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void commit();
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};
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} // namespace codeql
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