1/* vi: set sw=4 ts=4: */ 2/* 3 * env implementation for busybox 4 * 5 * Copyright (c) 1988, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Licensed under GPLv2 or later, see file LICENSE in this source tree. 9 * 10 * Original copyright notice is retained at the end of this file. 11 * 12 * Modified for BusyBox by Erik Andersen <andersen@codepoet.org> 13 */ 14/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) 15 * 16 * Fixed bug involving exit return codes if execvp fails. Also added 17 * output error checking. 18 */ 19/* 20 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003 21 * - correct "-" option usage 22 * - multiple "-u unsetenv" support 23 * - GNU long option support 24 * - use xfunc_error_retval 25 */ 26//config:config ENV 27//config: bool "env (4 kb)" 28//config: default y 29//config: help 30//config: env is used to set an environment variable and run 31//config: a command; without options it displays the current 32//config: environment. 33 34//applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env)) 35 36//kbuild:lib-$(CONFIG_ENV) += env.o 37 38/* BB_AUDIT SUSv3 compliant */ 39/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */ 40 41//usage:#define env_trivial_usage 42//usage: "[-iu] [-] [name=value]... [PROG ARGS]" 43//usage:#define env_full_usage "\n\n" 44//usage: "Print the current environment or run PROG after setting up\n" 45//usage: "the specified environment\n" 46//usage: "\n -, -i Start with an empty environment" 47//usage: "\n -u Remove variable from the environment" 48 49#include "libbb.h" 50 51int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 52int env_main(int argc UNUSED_PARAM, char **argv) 53{ 54 unsigned opts; 55 llist_t *unset_env = NULL; 56 57 opts = getopt32long(argv, "+iu:*", 58 "ignore-environment\0" No_argument "i" 59 "unset\0" Required_argument "u" 60 , &unset_env 61 ); 62 argv += optind; 63 if (argv[0] && LONE_DASH(argv[0])) { 64 opts |= 1; 65 ++argv; 66 } 67 if (opts & 1) { 68 clearenv(); 69 } 70 while (unset_env) { 71 char *var = llist_pop(&unset_env); 72 /* This does not handle -uVAR=VAL 73 * (coreutils _sets_ the variable in that case): */ 74 /*unsetenv(var);*/ 75 /* This does, but uses somewhan undocumented feature that 76 * putenv("name_without_equal_sign") unsets the variable: */ 77 putenv(var); 78 } 79 80 while (*argv && (strchr(*argv, '=') != NULL)) { 81 if (putenv(*argv) < 0) { 82 bb_perror_msg_and_die("putenv"); 83 } 84 ++argv; 85 } 86 87 if (argv[0]) { 88 BB_EXECVP_or_die(argv); 89 } 90 91 if (environ) { /* clearenv() may set environ == NULL! */ 92 char **ep; 93 for (ep = environ; *ep; ep++) { 94 puts(*ep); 95 } 96 } 97 98 fflush_stdout_and_exit(EXIT_SUCCESS); 99} 100 101/* 102 * Copyright (c) 1988, 1993, 1994 103 * The Regents of the University of California. All rights reserved. 104 * 105 * Redistribution and use in source and binary forms, with or without 106 * modification, are permitted provided that the following conditions 107 * are met: 108 * 1. Redistributions of source code must retain the above copyright 109 * notice, this list of conditions and the following disclaimer. 110 * 2. Redistributions in binary form must reproduce the above copyright 111 * notice, this list of conditions and the following disclaimer in the 112 * documentation and/or other materials provided with the distribution. 113 * 114 * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change 115 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change 116 * 117 * 4. Neither the name of the University nor the names of its contributors 118 * may be used to endorse or promote products derived from this software 119 * without specific prior written permission. 120 * 121 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND 122 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 123 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 124 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 125 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 126 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 127 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 128 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 129 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 130 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 131 * SUCH DAMAGE. 132 */ 133