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wdenk6aff3112002-12-17 01:51:00 +00001/*
Grant Ericksonbc117562008-05-06 20:16:15 -07002 * (C) Copyright 2000-2008
wdenk6aff3112002-12-17 01:51:00 +00003 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
wdenk3bac3512003-03-12 10:41:04 +000025 * Command line user interface to firmware (=U-Boot) environment.
wdenk6aff3112002-12-17 01:51:00 +000026 *
27 * Implements:
Grant Ericksonbc117562008-05-06 20:16:15 -070028 * fw_printenv [[ -n name ] | [ name ... ]]
29 * - prints the value of a single environment variable
30 * "name", the ``name=value'' pairs of one or more
31 * environment variables "name", or the whole
32 * environment if no names are specified.
wdenk6aff3112002-12-17 01:51:00 +000033 * fw_setenv name [ value ... ]
34 * - If a name without any values is given, the variable
35 * with this name is deleted from the environment;
36 * otherwise, all "value" arguments are concatenated,
Grant Ericksonbc117562008-05-06 20:16:15 -070037 * separated by single blank characters, and the
wdenk6aff3112002-12-17 01:51:00 +000038 * resulting string is assigned to the environment
39 * variable "name"
40 */
41
Joe Hershbergere4a223f2012-10-03 09:38:49 +000042#include <fcntl.h>
43#include <getopt.h>
wdenk6aff3112002-12-17 01:51:00 +000044#include <stdio.h>
45#include <string.h>
46#include <stdlib.h>
Joe Hershbergere4a223f2012-10-03 09:38:49 +000047#include <sys/file.h>
48#include <unistd.h>
wdenk6aff3112002-12-17 01:51:00 +000049#include "fw_env.h"
50
51#define CMD_PRINTENV "fw_printenv"
52#define CMD_SETENV "fw_setenv"
53
Stefano Babicbd7b26f2010-05-24 12:08:16 +020054static struct option long_options[] = {
55 {"script", required_argument, NULL, 's'},
56 {"help", no_argument, NULL, 'h'},
57 {NULL, 0, NULL, 0}
58};
59
60void usage(void)
61{
62
63 fprintf(stderr, "fw_printenv/fw_setenv, "
64 "a command line interface to U-Boot environment\n\n"
Daniel Hobi122bc082010-09-15 19:46:26 +020065 "usage:\tfw_printenv [-n] [variable name]\n"
Stefano Babicbd7b26f2010-05-24 12:08:16 +020066 "\tfw_setenv [variable name] [variable value]\n"
67 "\tfw_setenv -s [ file ]\n"
68 "\tfw_setenv -s - < [ file ]\n\n"
69 "The file passed as argument contains only pairs "
70 "name / value\n"
71 "Example:\n"
72 "# Any line starting with # is treated as comment\n"
73 "\n"
74 "\t netdev eth0\n"
75 "\t kernel_addr 400000\n"
76 "\t var1\n"
77 "\t var2 The quick brown fox jumps over the "
78 "lazy dog\n"
79 "\n"
80 "A variable without value will be dropped. It is possible\n"
81 "to put any number of spaces between the fields, but any\n"
82 "space inside the value is treated as part of the value "
83 "itself.\n\n"
84 );
85}
86
Joe Hershbergere4a223f2012-10-03 09:38:49 +000087int main(int argc, char *argv[])
wdenk6aff3112002-12-17 01:51:00 +000088{
89 char *p;
90 char *cmdname = *argv;
Stefano Babicbd7b26f2010-05-24 12:08:16 +020091 char *script_file = NULL;
92 int c;
Joe Hershbergere4a223f2012-10-03 09:38:49 +000093 const char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
94 int lockfd = -1;
95 int retval = EXIT_SUCCESS;
96
Mike Frysinger7a546db2012-11-10 19:47:46 +000097 lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
Joe Hershbergere4a223f2012-10-03 09:38:49 +000098 if (-1 == lockfd) {
99 fprintf(stderr, "Error opening lock file %s\n", lockname);
100 return EXIT_FAILURE;
101 }
102
103 if (-1 == flock(lockfd, LOCK_EX)) {
104 fprintf(stderr, "Error locking file %s\n", lockname);
105 close(lockfd);
106 return EXIT_FAILURE;
107 }
wdenk6aff3112002-12-17 01:51:00 +0000108
109 if ((p = strrchr (cmdname, '/')) != NULL) {
110 cmdname = p + 1;
111 }
112
Daniel Hobi122bc082010-09-15 19:46:26 +0200113 while ((c = getopt_long (argc, argv, "ns:h",
Stefano Babicbd7b26f2010-05-24 12:08:16 +0200114 long_options, NULL)) != EOF) {
115 switch (c) {
Daniel Hobi122bc082010-09-15 19:46:26 +0200116 case 'n':
117 /* handled in fw_printenv */
118 break;
Stefano Babicbd7b26f2010-05-24 12:08:16 +0200119 case 's':
120 script_file = optarg;
121 break;
122 case 'h':
123 usage();
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000124 goto exit;
Daniel Hobi29ccd7c2010-09-16 14:36:09 +0200125 default: /* '?' */
126 fprintf(stderr, "Try `%s --help' for more information."
127 "\n", cmdname);
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000128 retval = EXIT_FAILURE;
129 goto exit;
Stefano Babicbd7b26f2010-05-24 12:08:16 +0200130 }
131 }
132
wdenk6aff3112002-12-17 01:51:00 +0000133 if (strcmp(cmdname, CMD_PRINTENV) == 0) {
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000134 if (fw_printenv(argc, argv) != 0)
135 retval = EXIT_FAILURE;
wdenk6aff3112002-12-17 01:51:00 +0000136 } else if (strcmp(cmdname, CMD_SETENV) == 0) {
Stefano Babicbd7b26f2010-05-24 12:08:16 +0200137 if (!script_file) {
138 if (fw_setenv(argc, argv) != 0)
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000139 retval = EXIT_FAILURE;
Stefano Babicbd7b26f2010-05-24 12:08:16 +0200140 } else {
141 if (fw_parse_script(script_file) != 0)
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000142 retval = EXIT_FAILURE;
Stefano Babicbd7b26f2010-05-24 12:08:16 +0200143 }
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000144 } else {
145 fprintf(stderr,
146 "Identity crisis - may be called as `" CMD_PRINTENV
147 "' or as `" CMD_SETENV "' but not as `%s'\n",
148 cmdname);
149 retval = EXIT_FAILURE;
wdenk6aff3112002-12-17 01:51:00 +0000150 }
151
Joe Hershbergere4a223f2012-10-03 09:38:49 +0000152exit:
153 flock(lockfd, LOCK_UN);
154 close(lockfd);
155 return retval;
wdenk6aff3112002-12-17 01:51:00 +0000156}