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1f756fb386
This is generally more straightforward in cases where bounds checking isn't necessary.
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
// SPDX-License-Identifier: MIT
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/*
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$info$
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tags: Bin|FEXBash
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desc: Launches bash under FEX and passes arguments via -c to it
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$end_info$
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*/
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#include "Common/ArgumentLoader.h"
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#include <FEXCore/Config/Config.h>
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#include <filesystem>
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#include <string>
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#include <unistd.h>
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#include <vector>
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int main(int argc, char** argv, char** const envp) {
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FEX::ArgLoader::ArgLoader ArgsLoader(FEX::ArgLoader::ArgLoader::LoadType::WITHOUT_FEXLOADER_PARSER, argc, argv);
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auto Args = ArgsLoader.Get();
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std::vector<const char*> Argv;
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// FEXInterpreter will handle finding bash in the rootfs
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// Use /bin/sh for -c commands and /bin/bash for interactive mode
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const char* BashPath = Args.empty() ? "/bin/bash" : "/bin/sh";
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std::string FEXInterpreterPath = std::filesystem::path(argv[0]).parent_path().string() + "/FEXInterpreter";
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// Check if a local FEXInterpreter to FEXBash exists
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// If it does then it takes priority over the installed one
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if (!std::filesystem::exists(FEXInterpreterPath)) {
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char FEXBashPath[PATH_MAX];
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auto Result = readlink("/proc/self/exe", FEXBashPath, PATH_MAX);
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if (Result != -1) {
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FEXInterpreterPath = std::filesystem::path(&FEXBashPath[0], &FEXBashPath[Result]).parent_path().string() + "/FEXInterpreter";
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}
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if (!std::filesystem::exists(FEXInterpreterPath)) {
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fmt::print(stderr, "Could not locate FEXInterpreter executable\n");
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std::abort();
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}
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}
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const char* FEXArgs[] = {
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FEXInterpreterPath.c_str(),
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BashPath,
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"-c",
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};
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// Remove -c argument if arguments are empty
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// Lets us start an emulated bash instance
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const size_t FEXArgsCount = std::size(FEXArgs) - (Args.empty() ? 1 : 0);
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Argv.resize(Args.size() + FEXArgsCount);
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// Pass in the FEXInterpreter arguments
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for (size_t i = 0; i < FEXArgsCount; ++i) {
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Argv[i] = FEXArgs[i];
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}
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// Bring in passed in arguments
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for (size_t i = 0; i < Args.size(); ++i) {
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Argv[i + FEXArgsCount] = Args[i].c_str();
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}
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// Set --norc when no arguments are passed so PS1 doesn't get overwritten
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const char* NoRC = "--norc";
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if (Args.empty()) {
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Argv.emplace_back(NoRC);
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}
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Argv.emplace_back(nullptr);
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// Prepend `FEXBash>` to PS1 to be less confusing about running under emulation
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// In most cases PS1 isn't an environment variable, but instead a shell variable
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// But in case the user has set the PS1 environment variable then still prepend
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//
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// To get the shell variables as an environment variable then you can do `PS1=$PS1 FEXBash`
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std::vector<const char*> Envp {};
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char* PS1Env {};
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for (unsigned i = 0;; ++i) {
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if (envp[i] == nullptr) {
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break;
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}
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if (strstr(envp[i], "PS1=") == envp[i]) {
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PS1Env = envp[i];
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} else {
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Envp.emplace_back(envp[i]);
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}
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}
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std::string PS1 = "PS1=FEXBash-\\u@\\h:\\w> ";
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if (PS1Env) {
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PS1 += &PS1Env[strlen("PS1=")];
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}
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Envp.emplace_back(PS1.c_str());
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Envp.emplace_back(nullptr);
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return execve(Argv[0], const_cast<char* const*>(Argv.data()), const_cast<char* const*>(&Envp[0]));
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}
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