mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-10 13:00:20 +02:00
Tony Wasserka
02c11afbc6
Implicitly adding "-c" breaks argument passing for scripts. For example, the command "FEXBash ./steam.sh -silent" will process steam.sh but the script wouldn't see the "-silent" argument previously.
83 lines
2.4 KiB
C++
83 lines
2.4 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: Wrapper for invoking x86 bash from the rootfs using FEX
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$end_info$
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*/
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#include <FEXCore/fextl/fmt.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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// Skip argv[0].
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const int ArgCount = argc - 1;
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const bool EmptyArgs = ArgCount == 0;
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// FEX 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 = EmptyArgs ? "/bin/bash" : "/bin/sh";
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std::string FEXPath = std::filesystem::path(argv[0]).parent_path().string() + "/FEX";
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// Check if a local FEX 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(FEXPath)) {
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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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FEXPath = std::filesystem::path(&FEXBashPath[0], &FEXBashPath[Result]).parent_path().string() + "/FEX";
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}
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if (!std::filesystem::exists(FEXPath)) {
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fmt::print(stderr, "Could not locate FEX executable\n");
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std::abort();
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}
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}
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std::vector<const char*> Argv;
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Argv.emplace_back(FEXPath.c_str());
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Argv.emplace_back(BashPath);
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for (int i = 1; i < argc; ++i) {
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Argv.emplace_back(argv[i]);
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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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if (EmptyArgs) {
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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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