1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
/*
Provides a functions for working with shell.
Copyright (C) 2006-2023
Free Software Foundation, Inc.
Written by:
Slava Zanko <slavazanko@gmail.com>, 2015.
This file is part of the Midnight Commander.
The Midnight Commander is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
The Midnight Commander 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file shell.c
* \brief Source: provides a functions for working with shell.
*/
#include <config.h>
#include <pwd.h> /* for username in xterm title */
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "global.h"
#include "util.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
/*** file scope type declarations ****************************************************************/
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
static char rp_shell[PATH_MAX];
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/**
* Get a system shell.
*
* @return newly allocated mc_shell_t object with shell name
*/
static mc_shell_t *
mc_shell_get_installed_in_system (void)
{
mc_shell_t *mc_shell;
mc_shell = g_new0 (mc_shell_t, 1);
/* 3rd choice: look for existing shells supported as MC subshells. */
if (access ("/bin/bash", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/bash");
else if (access ("/bin/ash", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/ash");
else if (access ("/bin/dash", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/dash");
else if (access ("/bin/busybox", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/busybox");
else if (access ("/bin/zsh", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/zsh");
else if (access ("/bin/tcsh", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/tcsh");
else if (access ("/bin/csh", X_OK) == 0)
mc_shell->path = g_strdup ("/bin/csh");
/* No fish as fallback because it is so much different from other shells and
* in a way exotic (even though user-friendly by name) that we should not
* present it as a subshell without the user's explicit intention. We rather
* will not use a subshell but just a command line.
* else if (access("/bin/fish", X_OK) == 0)
* mc_global.tty.shell = g_strdup ("/bin/fish");
*/
else
/* Fallback and last resort: system default shell */
mc_shell->path = g_strdup ("/bin/sh");
return mc_shell;
}
/* --------------------------------------------------------------------------------------------- */
static char *
mc_shell_get_name_env (void)
{
const char *shell_env;
char *shell_name = NULL;
shell_env = g_getenv ("SHELL");
if ((shell_env == NULL) || (shell_env[0] == '\0'))
{
/* 2nd choice: user login shell */
struct passwd *pwd;
pwd = getpwuid (geteuid ());
if (pwd != NULL)
shell_name = g_strdup (pwd->pw_shell);
}
else
/* 1st choice: SHELL environment variable */
shell_name = g_strdup (shell_env);
return shell_name;
}
/* --------------------------------------------------------------------------------------------- */
static mc_shell_t *
mc_shell_get_from_env (void)
{
mc_shell_t *mc_shell = NULL;
char *shell_name;
shell_name = mc_shell_get_name_env ();
if (shell_name != NULL)
{
mc_shell = g_new0 (mc_shell_t, 1);
mc_shell->path = shell_name;
}
return mc_shell;
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_shell_recognize_real_path (mc_shell_t * mc_shell)
{
if (strstr (mc_shell->path, "/zsh") != NULL || strstr (mc_shell->real_path, "/zsh") != NULL
|| getenv ("ZSH_VERSION") != NULL)
{
/* Also detects ksh symlinked to zsh */
mc_shell->type = SHELL_ZSH;
mc_shell->name = "zsh";
}
else if (strstr (mc_shell->path, "/tcsh") != NULL
|| strstr (mc_shell->real_path, "/tcsh") != NULL)
{
/* Also detects csh symlinked to tcsh */
mc_shell->type = SHELL_TCSH;
mc_shell->name = "tcsh";
}
else if (strstr (mc_shell->path, "/csh") != NULL
|| strstr (mc_shell->real_path, "/csh") != NULL)
{
mc_shell->type = SHELL_TCSH;
mc_shell->name = "csh";
}
else if (strstr (mc_shell->path, "/fish") != NULL
|| strstr (mc_shell->real_path, "/fish") != NULL)
{
mc_shell->type = SHELL_FISH;
mc_shell->name = "fish";
}
else if (strstr (mc_shell->path, "/dash") != NULL
|| strstr (mc_shell->real_path, "/dash") != NULL)
{
/* Debian ash (also found if symlinked to by ash/sh) */
mc_shell->type = SHELL_DASH;
mc_shell->name = "dash";
}
else if (strstr (mc_shell->real_path, "/busybox") != NULL)
{
/* If shell is symlinked to busybox, assume it is an ash, even though theoretically
* it could also be a hush (a mini shell for non-MMU systems deactivated by default).
* For simplicity's sake we assume that busybox always contains an ash, not a hush.
* On embedded platforms or on server systems, /bin/sh often points to busybox.
* Sometimes even bash is symlinked to busybox (CONFIG_FEATURE_BASH_IS_ASH option),
* so we need to check busybox symlinks *before* checking for the name "bash"
* in order to avoid that case. */
mc_shell->type = SHELL_ASH_BUSYBOX;
mc_shell->name = mc_shell->path;
}
else
mc_shell->type = SHELL_NONE;
}
/* --------------------------------------------------------------------------------------------- */
static void
mc_shell_recognize_path (mc_shell_t * mc_shell)
{
/* If shell is not symlinked to busybox, it is safe to assume it is a real shell */
if (strstr (mc_shell->path, "/bash") != NULL || getenv ("BASH") != NULL)
{
mc_shell->type = SHELL_BASH;
mc_shell->name = "bash";
}
else if (strstr (mc_shell->path, "/sh") != NULL || getenv ("SH") != NULL)
{
mc_shell->type = SHELL_SH;
mc_shell->name = "sh";
}
else if (strstr (mc_shell->path, "/ash") != NULL || getenv ("ASH") != NULL)
{
mc_shell->type = SHELL_ASH_BUSYBOX;
mc_shell->name = "ash";
}
else
mc_shell->type = SHELL_NONE;
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
void
mc_shell_init (void)
{
mc_shell_t *mc_shell;
mc_shell = mc_shell_get_from_env ();
if (mc_shell == NULL)
mc_shell = mc_shell_get_installed_in_system ();
mc_shell->real_path = mc_realpath (mc_shell->path, rp_shell);
/* Find out what type of shell we have. Also consider real paths (resolved symlinks)
* because e.g. csh might point to tcsh, ash to dash or busybox, sh to anything. */
if (mc_shell->real_path != NULL)
mc_shell_recognize_real_path (mc_shell);
if (mc_shell->type == SHELL_NONE)
mc_shell_recognize_path (mc_shell);
if (mc_shell->type == SHELL_NONE)
mc_global.tty.use_subshell = FALSE;
mc_global.shell = mc_shell;
}
/* --------------------------------------------------------------------------------------------- */
void
mc_shell_deinit (void)
{
if (mc_global.shell != NULL)
{
g_free (mc_global.shell->path);
MC_PTR_FREE (mc_global.shell);
}
}
/* --------------------------------------------------------------------------------------------- */
|
