mirror of
https://github.com/MidnightCommander/mc
synced 2024-12-22 20:36:50 +03:00
263 lines
8.4 KiB
C
263 lines
8.4 KiB
C
/*
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Provides a functions for working with shell.
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Copyright (C) 2006-2022
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Free Software Foundation, Inc.
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Written by:
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Slava Zanko <slavazanko@gmail.com>, 2015.
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This file is part of the Midnight Commander.
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The Midnight Commander is free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the License,
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or (at your option) any later version.
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The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
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*/
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/** \file shell.c
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* \brief Source: provides a functions for working with shell.
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*/
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#include <config.h>
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#include <pwd.h> /* for username in xterm title */
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "global.h"
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#include "util.h"
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/*** global variables ****************************************************************************/
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/*** file scope macro definitions ****************************************************************/
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/*** file scope type declarations ****************************************************************/
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/*** file scope variables ************************************************************************/
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static char rp_shell[PATH_MAX];
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/*** file scope functions ************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/**
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* Get a system shell.
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*
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* @return newly allocated mc_shell_t object with shell name
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*/
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static mc_shell_t *
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mc_shell_get_installed_in_system (void)
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{
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mc_shell_t *mc_shell;
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mc_shell = g_new0 (mc_shell_t, 1);
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/* 3rd choice: look for existing shells supported as MC subshells. */
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if (access ("/bin/bash", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/bash");
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else if (access ("/bin/ash", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/ash");
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else if (access ("/bin/dash", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/dash");
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else if (access ("/bin/busybox", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/busybox");
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else if (access ("/bin/zsh", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/zsh");
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else if (access ("/bin/tcsh", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/tcsh");
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else if (access ("/bin/csh", X_OK) == 0)
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mc_shell->path = g_strdup ("/bin/csh");
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/* No fish as fallback because it is so much different from other shells and
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* in a way exotic (even though user-friendly by name) that we should not
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* present it as a subshell without the user's explicit intention. We rather
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* will not use a subshell but just a command line.
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* else if (access("/bin/fish", X_OK) == 0)
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* mc_global.tty.shell = g_strdup ("/bin/fish");
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*/
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else
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/* Fallback and last resort: system default shell */
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mc_shell->path = g_strdup ("/bin/sh");
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return mc_shell;
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}
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/* --------------------------------------------------------------------------------------------- */
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static char *
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mc_shell_get_name_env (void)
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{
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const char *shell_env;
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char *shell_name = NULL;
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shell_env = g_getenv ("SHELL");
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if ((shell_env == NULL) || (shell_env[0] == '\0'))
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{
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/* 2nd choice: user login shell */
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struct passwd *pwd;
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pwd = getpwuid (geteuid ());
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if (pwd != NULL)
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shell_name = g_strdup (pwd->pw_shell);
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}
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else
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/* 1st choice: SHELL environment variable */
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shell_name = g_strdup (shell_env);
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return shell_name;
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}
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/* --------------------------------------------------------------------------------------------- */
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static mc_shell_t *
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mc_shell_get_from_env (void)
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{
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mc_shell_t *mc_shell = NULL;
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char *shell_name;
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shell_name = mc_shell_get_name_env ();
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if (shell_name != NULL)
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{
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mc_shell = g_new0 (mc_shell_t, 1);
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mc_shell->path = shell_name;
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}
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return mc_shell;
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}
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/* --------------------------------------------------------------------------------------------- */
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static void
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mc_shell_recognize_real_path (mc_shell_t * mc_shell)
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{
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if (strstr (mc_shell->path, "/zsh") != NULL || strstr (mc_shell->real_path, "/zsh") != NULL
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|| getenv ("ZSH_VERSION") != NULL)
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{
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/* Also detects ksh symlinked to zsh */
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mc_shell->type = SHELL_ZSH;
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mc_shell->name = "zsh";
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}
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else if (strstr (mc_shell->path, "/tcsh") != NULL
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|| strstr (mc_shell->real_path, "/tcsh") != NULL)
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{
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/* Also detects csh symlinked to tcsh */
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mc_shell->type = SHELL_TCSH;
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mc_shell->name = "tcsh";
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}
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else if (strstr (mc_shell->path, "/csh") != NULL
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|| strstr (mc_shell->real_path, "/csh") != NULL)
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{
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mc_shell->type = SHELL_TCSH;
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mc_shell->name = "csh";
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}
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else if (strstr (mc_shell->path, "/fish") != NULL
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|| strstr (mc_shell->real_path, "/fish") != NULL)
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{
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mc_shell->type = SHELL_FISH;
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mc_shell->name = "fish";
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}
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else if (strstr (mc_shell->path, "/dash") != NULL
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|| strstr (mc_shell->real_path, "/dash") != NULL)
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{
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/* Debian ash (also found if symlinked to by ash/sh) */
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mc_shell->type = SHELL_DASH;
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mc_shell->name = "dash";
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}
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else if (strstr (mc_shell->real_path, "/busybox") != NULL)
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{
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/* If shell is symlinked to busybox, assume it is an ash, even though theoretically
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* it could also be a hush (a mini shell for non-MMU systems deactivated by default).
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* For simplicity's sake we assume that busybox always contains an ash, not a hush.
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* On embedded platforms or on server systems, /bin/sh often points to busybox.
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* Sometimes even bash is symlinked to busybox (CONFIG_FEATURE_BASH_IS_ASH option),
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* so we need to check busybox symlinks *before* checking for the name "bash"
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* in order to avoid that case. */
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mc_shell->type = SHELL_ASH_BUSYBOX;
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mc_shell->name = mc_shell->path;
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}
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else
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mc_shell->type = SHELL_NONE;
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}
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/* --------------------------------------------------------------------------------------------- */
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static void
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mc_shell_recognize_path (mc_shell_t * mc_shell)
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{
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/* If shell is not symlinked to busybox, it is safe to assume it is a real shell */
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if (strstr (mc_shell->path, "/bash") != NULL || getenv ("BASH") != NULL)
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{
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mc_shell->type = SHELL_BASH;
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mc_shell->name = "bash";
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}
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else if (strstr (mc_shell->path, "/sh") != NULL || getenv ("SH") != NULL)
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{
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mc_shell->type = SHELL_SH;
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mc_shell->name = "sh";
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}
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else if (strstr (mc_shell->path, "/ash") != NULL || getenv ("ASH") != NULL)
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{
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mc_shell->type = SHELL_ASH_BUSYBOX;
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mc_shell->name = "ash";
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}
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else
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mc_shell->type = SHELL_NONE;
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}
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/* --------------------------------------------------------------------------------------------- */
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/*** public functions ****************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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void
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mc_shell_init (void)
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{
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mc_shell_t *mc_shell;
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mc_shell = mc_shell_get_from_env ();
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if (mc_shell == NULL)
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mc_shell = mc_shell_get_installed_in_system ();
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mc_shell->real_path = mc_realpath (mc_shell->path, rp_shell);
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/* Find out what type of shell we have. Also consider real paths (resolved symlinks)
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* because e.g. csh might point to tcsh, ash to dash or busybox, sh to anything. */
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if (mc_shell->real_path != NULL)
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mc_shell_recognize_real_path (mc_shell);
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if (mc_shell->type == SHELL_NONE)
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mc_shell_recognize_path (mc_shell);
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if (mc_shell->type == SHELL_NONE)
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mc_global.tty.use_subshell = FALSE;
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mc_global.shell = mc_shell;
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}
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/* --------------------------------------------------------------------------------------------- */
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void
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mc_shell_deinit (void)
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{
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if (mc_global.shell != NULL)
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{
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g_free (mc_global.shell->path);
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MC_PTR_FREE (mc_global.shell);
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}
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}
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/* --------------------------------------------------------------------------------------------- */
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