mirror of
https://github.com/fish-shell/fish-shell
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d389b22afc
It's time once again to run `make style-all` to fix some style bogosities that have crept in.
552 lines
20 KiB
C++
552 lines
20 KiB
C++
// The main loop of the fish program.
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/*
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Copyright (C) 2005-2008 Axel Liljencrantz
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <limits.h>
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#include <locale.h>
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#include <pwd.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h> // IWYU pragma: keep
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <memory>
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#include <string>
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#include <vector>
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#include "builtin.h"
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#include "common.h"
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#include "env.h"
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#include "event.h"
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#include "expand.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "fish_version.h"
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#include "function.h"
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#include "history.h"
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#include "input.h"
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#include "input_common.h"
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#include "io.h"
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#include "parser.h"
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#include "path.h"
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#include "proc.h"
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#include "reader.h"
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#include "wildcard.h"
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#include "wutil.h" // IWYU pragma: keep
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// PATH_MAX may not exist.
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#ifndef PATH_MAX
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#define PATH_MAX 4096
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#endif
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/// If we are doing profiling, the filename to output to.
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static const char *s_profiling_output_filename = NULL;
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static bool has_suffix(const std::string &path, const char *suffix, bool ignore_case) {
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size_t pathlen = path.size(), suffixlen = strlen(suffix);
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return pathlen >= suffixlen &&
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!(ignore_case ? strcasecmp : strcmp)(path.c_str() + pathlen - suffixlen, suffix);
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}
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/// Modifies the given path by calling realpath. Returns true if realpath succeeded, false
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/// otherwise.
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static bool get_realpath(std::string &path) {
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char buff[PATH_MAX], *ptr;
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if ((ptr = realpath(path.c_str(), buff))) {
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path = ptr;
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}
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return ptr != NULL;
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}
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// OS X function for getting the executable path.
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extern "C" {
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int _NSGetExecutablePath(char *buf, uint32_t *bufsize);
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}
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/// Return the path to the current executable. This needs to be realpath'd.
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static std::string get_executable_path(const char *argv0) {
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char buff[PATH_MAX];
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#if __APPLE__
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// On OS X use it's proprietary API to get the path to the executable.
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// This is basically grabbing exec_path after argc, argv, envp, ...: for us
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// https://opensource.apple.com/source/adv_cmds/adv_cmds-163/ps/print.c
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uint32_t buffSize = sizeof buff;
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if (_NSGetExecutablePath(buff, &buffSize) == 0) return std::string(buff);
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#else
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// On non-OS X UNIXes, try /proc directory.
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ssize_t len;
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len = readlink("/proc/self/exe", buff, sizeof buff - 1); // Linux
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if (len == -1) {
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len = readlink("/proc/curproc/file", buff, sizeof buff - 1); // BSD
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if (len == -1) {
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len = readlink("/proc/self/path/a.out", buff, sizeof buff - 1); // Solaris
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}
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}
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if (len > 0) {
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buff[len] = '\0';
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return std::string(buff);
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}
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#endif
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// Just return argv0, which probably won't work (i.e. it's not an absolute path or a path
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// relative to the working directory, but instead something the caller found via $PATH). We'll
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// eventually fall back to the compile time paths.
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return std::string(argv0 ? argv0 : "");
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}
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static struct config_paths_t determine_config_directory_paths(const char *argv0) {
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struct config_paths_t paths;
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bool done = false;
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std::string exec_path = get_executable_path(argv0);
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if (get_realpath(exec_path)) {
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debug(2, L"exec_path: '%s'", exec_path.c_str());
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if (!done) {
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// The next check is that we are in a reloctable directory tree
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const char *installed_suffix = "/bin/fish";
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const char *just_a_fish = "/fish";
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const char *suffix = NULL;
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if (has_suffix(exec_path, installed_suffix, false)) {
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suffix = installed_suffix;
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} else if (has_suffix(exec_path, just_a_fish, false)) {
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debug(2, L"'fish' not in a 'bin/', trying paths relative to source tree");
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suffix = just_a_fish;
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}
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if (suffix) {
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bool seems_installed = (suffix == installed_suffix);
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wcstring base_path = str2wcstring(exec_path);
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base_path.resize(base_path.size() - strlen(suffix));
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paths.data = base_path + (seems_installed ? L"/share/fish" : L"/share");
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paths.sysconf = base_path + (seems_installed ? L"/etc/fish" : L"/etc");
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paths.doc = base_path + (seems_installed ? L"/share/doc/fish" : L"/user_doc/html");
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paths.bin = base_path + (seems_installed ? L"/bin" : L"");
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// Check only that the data and sysconf directories exist. Handle the doc
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// directories separately.
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struct stat buf;
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if (0 == wstat(paths.data, &buf) && 0 == wstat(paths.sysconf, &buf)) {
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// The docs dir may not exist; in that case fall back to the compiled in path.
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if (0 != wstat(paths.doc, &buf)) {
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paths.doc = L"" DOCDIR;
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}
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done = true;
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}
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}
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}
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}
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if (!done) {
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// Fall back to what got compiled in.
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debug(2, L"Using compiled in paths:");
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paths.data = L"" DATADIR "/fish";
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paths.sysconf = L"" SYSCONFDIR "/fish";
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paths.doc = L"" DOCDIR;
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paths.bin = L"" BINDIR;
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}
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debug(2,
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L"determine_config_directory_paths() results:\npaths.data: %ls\npaths.sysconf: "
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L"%ls\npaths.doc: %ls\npaths.bin: %ls",
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paths.data.c_str(), paths.sysconf.c_str(), paths.doc.c_str(), paths.bin.c_str());
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return paths;
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}
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// Source the file config.fish in the given directory.
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static void source_config_in_directory(const wcstring &dir) {
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// If the config.fish file doesn't exist or isn't readable silently return. Fish versions up
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// thru 2.2.0 would instead try to source the file with stderr redirected to /dev/null to deal
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// with that possibility.
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//
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// This introduces a race condition since the readability of the file can change between this
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// test and the execution of the 'source' command. However, that is not a security problem in
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// this context so we ignore it.
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const wcstring config_pathname = dir + L"/config.fish";
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const wcstring escaped_dir = escape_string(dir, ESCAPE_ALL);
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const wcstring escaped_pathname = escaped_dir + L"/config.fish";
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if (waccess(config_pathname, R_OK) != 0) {
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debug(2, L"not sourcing %ls (not readable or does not exist)", escaped_pathname.c_str());
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return;
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}
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debug(2, L"sourcing %ls", escaped_pathname.c_str());
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const wcstring cmd = L"builtin source " + escaped_pathname;
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parser_t &parser = parser_t::principal_parser();
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parser.set_is_within_fish_initialization(true);
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parser.eval(cmd, io_chain_t(), TOP);
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parser.set_is_within_fish_initialization(false);
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}
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static int try_connect_socket(std::string &name) {
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int s, r, ret = -1;
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/// Connect to a DGRAM socket rather than the expected STREAM. This avoids any notification to a
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/// remote socket that we have connected, preventing any surprising behaviour. If the connection
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/// fails with EPROTOTYPE, the connection is probably a STREAM; if it succeeds or fails any
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/// other way, there is no cause for alarm. With thanks to Andrew Lutomirski <github.com/amluto>
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if ((s = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) {
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wperror(L"socket");
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return -1;
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}
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debug(3, L"Connect to socket %s at fd %d", name.c_str(), s);
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struct sockaddr_un local = {};
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local.sun_family = AF_UNIX;
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strncpy(local.sun_path, name.c_str(), (sizeof local.sun_path) - 1);
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r = connect(s, (struct sockaddr *)&local, sizeof local);
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if (r == -1 && errno == EPROTOTYPE) {
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ret = 0;
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}
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close(s);
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return ret;
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}
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/// Check for a running fishd from old versions and warn about not being able to share variables.
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/// https://github.com/fish-shell/fish-shell/issues/1730
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static void check_running_fishd() {
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// There are two paths to check:
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// $FISHD_SOCKET_DIR/fishd.socket.$USER or /tmp/fishd.socket.$USER
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// - referred to as the "old socket"
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// $XDG_RUNTIME_DIR/fishd.socket or /tmp/fish.$USER/fishd.socket
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// - referred to as the "new socket"
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// All existing versions of fish attempt to create the old socket, but
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// failure in newer versions is not treated as critical, so both need
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// to be checked.
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const char *uname = getenv("USER");
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if (uname == NULL) {
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const struct passwd *pw = getpwuid(getuid());
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uname = pw->pw_name;
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}
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const char *dir_old_socket = getenv("FISHD_SOCKET_DIR");
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std::string path_old_socket;
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if (dir_old_socket == NULL) {
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path_old_socket = "/tmp/";
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} else {
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path_old_socket.append(dir_old_socket);
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}
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path_old_socket.append("fishd.socket.");
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path_old_socket.append(uname);
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const char *dir_new_socket = getenv("XDG_RUNTIME_DIR");
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std::string path_new_socket;
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if (dir_new_socket == NULL) {
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path_new_socket = "/tmp/fish.";
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path_new_socket.append(uname);
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path_new_socket.push_back('/');
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} else {
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path_new_socket.append(dir_new_socket);
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}
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path_new_socket.append("fishd.socket");
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if (try_connect_socket(path_old_socket) == 0 || try_connect_socket(path_new_socket) == 0) {
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debug(1, _(L"Old versions of fish appear to be running. You will not be able to share "
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L"variable values between old and new fish sessions. For best results, restart "
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L"all running instances of fish."));
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}
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}
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/// Parse init files. exec_path is the path of fish executable as determined by argv[0].
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static int read_init(const struct config_paths_t &paths) {
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source_config_in_directory(paths.data);
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source_config_in_directory(paths.sysconf);
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// We need to get the configuration directory before we can source the user configuration file.
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// If path_get_config returns false then we have no configuration directory and no custom config
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// to load.
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wcstring config_dir;
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if (path_get_config(config_dir)) {
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source_config_in_directory(config_dir);
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}
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return 1;
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}
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/// Parse the argument list, return the index of the first non-flag arguments.
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static int fish_parse_opt(int argc, char **argv, std::vector<std::string> *cmds) {
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const char *short_opts = "+hilnvc:p:d:D:";
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const struct option long_opts[] = {{"command", required_argument, NULL, 'c'},
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{"debug-level", required_argument, NULL, 'd'},
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{"debug-stack-frames", required_argument, NULL, 'D'},
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{"interactive", no_argument, NULL, 'i'},
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{"login", no_argument, NULL, 'l'},
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{"no-execute", no_argument, NULL, 'n'},
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{"profile", required_argument, NULL, 'p'},
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'v'},
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{NULL, 0, NULL, 0}};
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int opt;
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while ((opt = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
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switch (opt) {
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case 0: {
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fwprintf(stderr, _(L"getopt_long() unexpectedly returned zero\n"));
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exit(127);
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}
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case 'c': {
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cmds->push_back(optarg);
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break;
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}
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case 'd': {
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char *end;
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long tmp;
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errno = 0;
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tmp = strtol(optarg, &end, 10);
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if (tmp >= 0 && tmp <= 10 && !*end && !errno) {
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debug_level = (int)tmp;
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} else {
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fwprintf(stderr, _(L"Invalid value '%s' for debug-level flag"), optarg);
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exit(1);
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}
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break;
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}
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case 'h': {
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cmds->push_back("__fish_print_help fish");
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break;
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}
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case 'i': {
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is_interactive_session = 1;
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break;
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}
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case 'l': {
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is_login = 1;
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break;
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}
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case 'n': {
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no_exec = 1;
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break;
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}
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case 'p': {
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s_profiling_output_filename = optarg;
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g_profiling_active = true;
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break;
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}
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case 'v': {
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fwprintf(stdout, _(L"%s, version %s\n"), PACKAGE_NAME, get_fish_version());
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exit(0);
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}
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case 'D': {
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char *end;
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long tmp;
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errno = 0;
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tmp = strtol(optarg, &end, 10);
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if (tmp > 0 && tmp <= 128 && !*end && !errno) {
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debug_stack_frames = (int)tmp;
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} else {
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fwprintf(stderr, _(L"Invalid value '%s' for debug-stack-frames flag"), optarg);
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exit(1);
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}
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break;
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}
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default: {
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// We assume getopt_long() has already emitted a diagnostic msg.
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exit(1);
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}
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}
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}
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// If our command name begins with a dash that implies we're a login shell.
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is_login |= argv[0][0] == '-';
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// We are an interactive session if we have not been given an explicit
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// command or file to execute and stdin is a tty. Note that the -i or
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// --interactive options also force interactive mode.
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if (cmds->size() == 0 && optind == argc && isatty(STDIN_FILENO)) {
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is_interactive_session = 1;
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}
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return optind;
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}
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/// Various things we need to initialize at run-time that don't really fit any of the other init
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/// routines.
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static void misc_init() {
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#ifdef OS_IS_CYGWIN
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// MS Windows tty devices do not currently have either a read or write timestamp. Those
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// respective fields of `struct stat` are always the current time. Which means we can't
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// use them. So we assume no external program has written to the terminal behind our
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// back. This makes multiline promptusable. See issue #2859 and
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// https://github.com/Microsoft/BashOnWindows/issues/545
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has_working_tty_timestamps = false;
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#else
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// This covers preview builds of Windows Subsystem for Linux (WSL).
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FILE *procsyskosrel;
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if ((procsyskosrel = wfopen(L"/proc/sys/kernel/osrelease", "r"))) {
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wcstring osrelease;
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fgetws2(&osrelease, procsyskosrel);
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if (osrelease.find(L"3.4.0-Microsoft") != wcstring::npos) {
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has_working_tty_timestamps = false;
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}
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}
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if (procsyskosrel) {
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fclose(procsyskosrel);
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}
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#endif // OS_IS_MS_WINDOWS
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}
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int main(int argc, char **argv) {
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int res = 1;
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int my_optind = 0;
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// We can't do this at compile time due to the use of enum symbols.
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assert(EXPAND_SENTINAL >= EXPAND_RESERVED_BASE && EXPAND_SENTINAL <= EXPAND_RESERVED_END);
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assert(ANY_SENTINAL >= WILDCARD_RESERVED_BASE && ANY_SENTINAL <= WILDCARD_RESERVED_END);
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assert(R_SENTINAL >= INPUT_COMMON_BASE && R_SENTINAL <= INPUT_COMMON_END);
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program_name = L"fish";
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set_main_thread();
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setup_fork_guards();
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setlocale(LC_ALL, "");
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fish_setlocale();
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// struct stat tmp;
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// stat("----------FISH_HIT_MAIN----------", &tmp);
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if (!argv[0]) {
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static const char *dummy_argv[2] = {"fish", NULL};
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argv = (char **)dummy_argv; //!OCLINT(parameter reassignment)
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argc = 1; //!OCLINT(parameter reassignment)
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}
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std::vector<std::string> cmds;
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my_optind = fish_parse_opt(argc, argv, &cmds);
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// No-exec is prohibited when in interactive mode.
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if (is_interactive_session && no_exec) {
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debug(1, _(L"Can not use the no-execute mode when running an interactive session"));
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no_exec = 0;
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}
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// Only save (and therefore restore) the fg process group if we are interactive. See issues
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// #197 and #1002.
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if (is_interactive_session) {
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save_term_foreground_process_group();
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}
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const struct config_paths_t paths = determine_config_directory_paths(argv[0]);
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proc_init();
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event_init();
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builtin_init();
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function_init();
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env_init(&paths);
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reader_init();
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history_init();
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// For set_color to support term256 in config.fish (issue #1022).
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update_fish_color_support();
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misc_init();
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parser_t &parser = parser_t::principal_parser();
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|
|
|
const io_chain_t empty_ios;
|
|
if (read_init(paths)) {
|
|
// Stomp the exit status of any initialization commands (issue #635).
|
|
proc_set_last_status(STATUS_BUILTIN_OK);
|
|
|
|
// Run the commands specified as arguments, if any.
|
|
if (!cmds.empty()) {
|
|
// Do something nasty to support OpenSUSE assuming we're bash. This may modify cmds.
|
|
if (is_login) {
|
|
fish_xdm_login_hack_hack_hack_hack(&cmds, argc - my_optind, argv + my_optind);
|
|
}
|
|
for (size_t i = 0; i < cmds.size(); i++) {
|
|
const wcstring cmd_wcs = str2wcstring(cmds.at(i));
|
|
res = parser.eval(cmd_wcs, empty_ios, TOP);
|
|
}
|
|
reader_exit(0, 0);
|
|
} else if (my_optind == argc) {
|
|
// Interactive mode
|
|
check_running_fishd();
|
|
res = reader_read(STDIN_FILENO, empty_ios);
|
|
} else {
|
|
char *file = *(argv + (my_optind++));
|
|
int fd = open(file, O_RDONLY);
|
|
if (fd == -1) {
|
|
perror(file);
|
|
} else {
|
|
// OK to not do this atomically since we cannot have gone multithreaded yet.
|
|
set_cloexec(fd);
|
|
|
|
if (*(argv + my_optind)) {
|
|
wcstring sb;
|
|
char **ptr;
|
|
int i;
|
|
for (i = 1, ptr = argv + my_optind; *ptr; i++, ptr++) {
|
|
if (i != 1) sb.append(ARRAY_SEP_STR);
|
|
sb.append(str2wcstring(*ptr));
|
|
}
|
|
|
|
env_set(L"argv", sb.c_str(), 0);
|
|
}
|
|
|
|
const wcstring rel_filename = str2wcstring(file);
|
|
|
|
reader_push_current_filename(rel_filename.c_str());
|
|
|
|
res = reader_read(fd, empty_ios);
|
|
|
|
if (res) {
|
|
debug(1, _(L"Error while reading file %ls\n"), reader_current_filename()
|
|
? reader_current_filename()
|
|
: _(L"Standard input"));
|
|
}
|
|
reader_pop_current_filename();
|
|
}
|
|
}
|
|
}
|
|
|
|
int exit_status = res ? STATUS_UNKNOWN_COMMAND : proc_get_last_status();
|
|
|
|
proc_fire_event(L"PROCESS_EXIT", EVENT_EXIT, getpid(), exit_status);
|
|
|
|
restore_term_mode();
|
|
restore_term_foreground_process_group();
|
|
|
|
if (g_profiling_active) {
|
|
parser.emit_profiling(s_profiling_output_filename);
|
|
}
|
|
|
|
history_destroy();
|
|
proc_destroy();
|
|
builtin_destroy();
|
|
reader_destroy();
|
|
event_destroy();
|
|
exit_without_destructors(exit_status);
|
|
return EXIT_FAILURE; // above line should always exit
|
|
}
|