324 lines
11 KiB
C++
324 lines
11 KiB
C++
#include "shell_manager.hh"
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#include "buffer_utils.hh"
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#include "clock.hh"
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#include "context.hh"
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#include "display_buffer.hh"
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#include "event_manager.hh"
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#include "face_registry.hh"
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#include "file.hh"
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#include "flags.hh"
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#include "option.hh"
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#include "regex.hh"
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#include <cstring>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <cstdlib>
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extern char **environ;
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namespace Kakoune
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{
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ShellManager::ShellManager()
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{
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// Get a guaranteed to be POSIX shell binary
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{
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auto size = confstr(_CS_PATH, nullptr, 0);
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String path; path.resize(size-1, 0);
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confstr(_CS_PATH, path.data(), size);
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for (auto dir : StringView{path} | split<StringView>(':'))
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{
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String candidate = format("{}/sh", dir);
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struct stat st;
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if (stat(candidate.c_str(), &st))
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continue;
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bool executable = (st.st_mode & S_IXUSR)
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| (st.st_mode & S_IXGRP)
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| (st.st_mode & S_IXOTH);
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if (S_ISREG(st.st_mode) and executable)
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{
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m_shell = std::move(candidate);
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break;
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}
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}
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if (m_shell.empty())
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throw runtime_error{format("unable to find a posix shell in {}", path)};
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}
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// Add Kakoune binary location to the path to guarantee that %sh{ ... }
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// have access to the kak command regardless of if the user installed it
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{
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const char* path = getenv("PATH");
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auto new_path = format("{}:{}", path, split_path(get_kak_binary_path()).first);
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setenv("PATH", new_path.c_str(), 1);
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}
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}
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namespace
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{
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struct Pipe
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{
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Pipe(bool create = true)
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: m_fd{-1, -1}
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{
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if (create and ::pipe(m_fd) < 0)
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throw runtime_error(format("unable to create pipe (fds: {}/{}; errno: {})", m_fd[0], m_fd[1], ::strerror(errno)));
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}
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~Pipe() { close_read_fd(); close_write_fd(); }
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int read_fd() const { return m_fd[0]; }
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int write_fd() const { return m_fd[1]; }
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void close_read_fd() { close_fd(m_fd[0]); }
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void close_write_fd() { close_fd(m_fd[1]); }
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private:
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void close_fd(int& fd) { if (fd != -1) { close(fd); fd = -1; } }
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int m_fd[2];
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};
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template<typename Func>
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pid_t spawn_shell(const char* shell, StringView cmdline,
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ConstArrayView<String> params,
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ConstArrayView<String> kak_env,
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Func setup_child)
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{
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Vector<const char*> envptrs;
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for (char** envp = environ; *envp; ++envp)
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envptrs.push_back(*envp);
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for (auto& env : kak_env)
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envptrs.push_back(env.c_str());
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envptrs.push_back(nullptr);
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auto cmdlinezstr = cmdline.zstr();
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Vector<const char*> execparams = { shell, "-c", cmdlinezstr };
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if (not params.empty())
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execparams.push_back(shell);
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for (auto& param : params)
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execparams.push_back(param.c_str());
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execparams.push_back(nullptr);
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if (pid_t pid = fork())
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return pid;
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setup_child();
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execve(shell, (char* const*)execparams.data(), (char* const*)envptrs.data());
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exit(-1);
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return -1;
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}
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Vector<String> generate_env(StringView cmdline, const Context& context, const ShellContext& shell_context)
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{
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static const Regex re(R"(\bkak_(\w+)\b)");
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Vector<String> kak_env;
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for (RegexIterator<const char*> it{cmdline.begin(), cmdline.end(), re}, end;
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it != end; ++it)
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{
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StringView name{(*it)[1].first, (*it)[1].second};
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auto match_name = [&](const String& s) {
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return s.length() > name.length() and
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prefix_match(s, name) and s[name.length()] == '=';
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};
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if (contains_that(kak_env, match_name))
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continue;
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auto var_it = shell_context.env_vars.find(name);
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try
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{
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const String& value = var_it != shell_context.env_vars.end() ?
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var_it->value : ShellManager::instance().get_val(name, context);
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kak_env.push_back(format("kak_{}={}", name, value));
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} catch (runtime_error&) {}
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}
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return kak_env;
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}
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}
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std::pair<String, int> ShellManager::eval(
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StringView cmdline, const Context& context, StringView input,
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Flags flags, const ShellContext& shell_context)
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{
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const DebugFlags debug_flags = context.options()["debug"].get<DebugFlags>();
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const bool profile = debug_flags & DebugFlags::Profile;
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if (debug_flags & DebugFlags::Shell)
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write_to_debug_buffer(format("shell:\n{}\n----\n", cmdline));
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auto start_time = profile ? Clock::now() : Clock::time_point{};
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auto kak_env = generate_env(cmdline, context, shell_context);
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auto spawn_time = profile ? Clock::now() : Clock::time_point{};
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Pipe child_stdin{not input.empty()}, child_stdout, child_stderr;
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pid_t pid = spawn_shell(m_shell.c_str(), cmdline, shell_context.params, kak_env,
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[&child_stdin, &child_stdout, &child_stderr] {
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auto move = [](int oldfd, int newfd) { dup2(oldfd, newfd); close(oldfd); };
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if (child_stdin.read_fd() != -1)
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{
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close(child_stdin.write_fd());
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move(child_stdin.read_fd(), 0);
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}
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else
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move(open("/dev/null", O_RDONLY), 0);
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close(child_stdout.read_fd());
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move(child_stdout.write_fd(), 1);
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close(child_stderr.read_fd());
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move(child_stderr.write_fd(), 2);
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});
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child_stdin.close_read_fd();
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child_stdout.close_write_fd();
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child_stderr.close_write_fd();
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auto wait_time = Clock::now();
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struct PipeReader : FDWatcher
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{
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PipeReader(Pipe& pipe, String& contents)
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: FDWatcher(pipe.read_fd(), FdEvents::Read,
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[&contents, &pipe](FDWatcher& watcher, FdEvents, EventMode) {
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char buffer[1024];
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while (fd_readable(pipe.read_fd()))
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{
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size_t size = ::read(pipe.read_fd(), buffer, 1024);
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if (size <= 0)
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{
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pipe.close_read_fd();
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watcher.disable();
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return;
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}
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contents += StringView{buffer, buffer+size};
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}
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})
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{}
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};
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struct PipeWriter : FDWatcher
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{
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PipeWriter(Pipe& pipe, StringView contents)
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: FDWatcher(pipe.write_fd(), FdEvents::Write,
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[contents, &pipe](FDWatcher& watcher, FdEvents, EventMode) mutable {
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while (fd_writable(pipe.write_fd()))
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{
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ssize_t size = ::write(pipe.write_fd(), contents.begin(),
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(size_t)contents.length());
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if (size > 0)
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contents = contents.substr(ByteCount{(int)size});
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if (size == -1 and (errno == EAGAIN or errno == EWOULDBLOCK))
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return;
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if (size < 0 or contents.empty())
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{
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pipe.close_write_fd();
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watcher.disable();
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return;
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}
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}
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})
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{
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int flags = fcntl(pipe.write_fd(), F_GETFL, 0);
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fcntl(pipe.write_fd(), F_SETFL, flags | O_NONBLOCK);
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}
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};
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String stdout_contents, stderr_contents;
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PipeReader stdout_reader{child_stdout, stdout_contents};
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PipeReader stderr_reader{child_stderr, stderr_contents};
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PipeWriter stdin_writer{child_stdin, input};
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// block SIGCHLD to make sure we wont receive it before
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// our call to pselect, that will end up blocking indefinitly.
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sigset_t mask, orig_mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &mask, &orig_mask);
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auto restore_mask = on_scope_end([&] { sigprocmask(SIG_SETMASK, &orig_mask, nullptr); });
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int status = 0;
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// check for termination now that SIGCHLD is blocked
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bool terminated = waitpid(pid, &status, WNOHANG) != 0;
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using namespace std::chrono;
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static constexpr seconds wait_timeout{1};
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bool wait_notified = false;
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Timer wait_timer{wait_time + wait_timeout, [&](Timer& timer)
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{
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auto wait_duration = Clock::now() - wait_time;
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context.print_status({ format("waiting for shell command to finish ({}s)",
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duration_cast<seconds>(wait_duration).count()),
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get_face("Information") }, true);
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timer.set_next_date(Clock::now() + wait_timeout);
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wait_notified = true;
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}, EventMode::Urgent};
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while (not terminated or child_stdin.write_fd() != -1 or
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((flags & Flags::WaitForStdout) and
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(child_stdout.read_fd() != -1 or child_stderr.read_fd() != -1)))
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{
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EventManager::instance().handle_next_events(EventMode::Urgent, &orig_mask);
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if (not terminated)
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terminated = waitpid(pid, &status, WNOHANG) != 0;
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}
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if (not stderr_contents.empty())
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write_to_debug_buffer(format("shell stderr: <<<\n{}>>>", stderr_contents));
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if (profile)
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{
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auto end_time = Clock::now();
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auto full = duration_cast<milliseconds>(end_time - start_time);
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auto spawn = duration_cast<milliseconds>(wait_time - spawn_time);
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auto wait = duration_cast<milliseconds>(end_time - wait_time);
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write_to_debug_buffer(format("shell execution took {} ms (spawn: {}, wait: {})",
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(size_t)full.count(), (size_t)spawn.count(), (size_t)wait.count()));
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}
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if (wait_notified) // clear the status line
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context.print_status({ "", get_face("Information") }, true);
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return { std::move(stdout_contents), WIFEXITED(status) ? WEXITSTATUS(status) : -1 };
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}
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void ShellManager::register_env_var(StringView str, bool prefix,
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EnvVarRetriever retriever)
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{
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m_env_vars.push_back({ str.str(), prefix, std::move(retriever) });
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}
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String ShellManager::get_val(StringView name, const Context& context) const
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{
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auto env_var = std::find_if(
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m_env_vars.begin(), m_env_vars.end(),
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[name](const EnvVarDesc& desc) {
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return desc.prefix ? prefix_match(name, desc.str) : name == desc.str;
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});
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if (env_var == m_env_vars.end())
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throw runtime_error("no such env var: " + name);
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return env_var->func(name, context);
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}
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CandidateList ShellManager::complete_env_var(StringView prefix,
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ByteCount cursor_pos) const
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{
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return complete(prefix, cursor_pos,
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m_env_vars | transform(std::mem_fn(&EnvVarDesc::str)));
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}
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}
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