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https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 22:02:55 +01:00
Jon Ross-Perkins
c59faea0e8
Handling for relative symlinks is new (comment talks about relative symlinks). Relocated to add tests though, to do extra checking of logic.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_INSTALL_BUSYBOX_INFO_H_
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#define CARBON_TOOLCHAIN_INSTALL_BUSYBOX_INFO_H_
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#include <filesystem>
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#include <optional>
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#include <string>
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#include "common/error.h"
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#include "llvm/ADT/StringRef.h"
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namespace Carbon {
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struct BusyboxInfo {
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// The path to `carbon-busybox`.
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std::filesystem::path bin_path;
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// The mode, such as `carbon` or `clang`.
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std::optional<std::string> mode;
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};
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// Returns the busybox information, given argv[0]. This primarily handles
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// resolving symlinks that point at the busybox.
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inline auto GetBusyboxInfo(llvm::StringRef argv0) -> ErrorOr<BusyboxInfo> {
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BusyboxInfo info = BusyboxInfo{argv0.str(), std::nullopt};
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while (true) {
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std::string filename = info.bin_path.filename();
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if (filename == "carbon-busybox") {
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return info;
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}
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std::error_code ec;
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auto symlink_target = std::filesystem::read_symlink(info.bin_path, ec);
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if (ec) {
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return ErrorBuilder()
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<< "expected carbon-busybox symlink at `" << info.bin_path << "`";
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}
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info.mode = filename;
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// Do a path join, to handle relative symlinks.
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info.bin_path = info.bin_path.parent_path() / symlink_target;
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}
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}
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_INSTALL_BUSYBOX_INFO_H_
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