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/*
* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
* Copyright (C) 1999, 2000 Red Hat, Inc.
* Copyright (C) 2012-2021 MATE Developers
* All rights reserved.
*
* This file is part of the Mate Library.
*
* The Mate Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* The Mate Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the Mate Library; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/*
@NOTATION@
*/
/*
*
* Mate utility routines.
* (C) 1997, 1998, 1999 the Free Software Foundation.
*
* Author: Miguel de Icaza,
*/
#include <config.h>
#include "eggshell.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <glib.h>
/**
* egg_shell:
* @shell: the value of the SHELL env variable
*
* Retrieves the user's preferred shell.
*
* Returns: A newly allocated string that is the path to the shell.
*/
char *
egg_shell (const char *shell)
{
struct passwd *pw;
int i;
static const char shells [][14] =
{
/* Note that on some systems shells can also
* be installed in /usr/bin */
"/bin/bash", "/usr/bin/bash",
"/bin/zsh", "/usr/bin/zsh",
"/bin/tcsh", "/usr/bin/tcsh",
"/bin/ksh", "/usr/bin/ksh",
"/bin/csh", "/bin/sh"
};
if (geteuid () == getuid () &&
getegid () == getgid ())
{
/* only in non-setuid */
if (shell != NULL)
{
if (access (shell, X_OK) == 0)
{
return g_strdup (shell);
}
}
}
pw = getpwuid(getuid());
if (pw && pw->pw_shell)
{
if (access (pw->pw_shell, X_OK) == 0)
{
return g_strdup (pw->pw_shell);
}
}
for (i = 0; i != G_N_ELEMENTS (shells); i++)
{
if (access (shells [i], X_OK) == 0)
{
return g_strdup (shells[i]);
}
}
/* If /bin/sh doesn't exist, your system is truly broken. */
g_assert_not_reached ();
/* Placate compiler. */
return NULL;
}
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