144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* env implementation for busybox
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*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*
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* Original copyright notice is retained at the end of this file.
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*
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* Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
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*/
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Fixed bug involving exit return codes if execvp fails. Also added
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* output error checking.
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*/
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/*
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* Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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* - correct "-" option usage
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* - multiple "-u unsetenv" support
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* - GNU long option support
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* - use xfunc_error_retval
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*/
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//config:config ENV
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//config: bool "env (3.8 kb)"
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//config: default y
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//config: help
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//config: env is used to set an environment variable and run
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//config: a command; without options it displays the current
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//config: environment.
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//config:
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//config:config FEATURE_ENV_LONG_OPTIONS
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//config: bool "Enable long options"
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//config: default y
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//config: depends on ENV && LONG_OPTS
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//applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
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//kbuild:lib-$(CONFIG_ENV) += env.o
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
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//usage:#define env_trivial_usage
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//usage: "[-iu] [-] [name=value]... [PROG ARGS]"
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//usage:#define env_full_usage "\n\n"
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//usage: "Print the current environment or run PROG after setting up\n"
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//usage: "the specified environment\n"
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//usage: "\n -, -i Start with an empty environment"
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//usage: "\n -u Remove variable from the environment"
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#include "libbb.h"
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#if ENABLE_FEATURE_ENV_LONG_OPTIONS
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static const char env_longopts[] ALIGN1 =
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"ignore-environment\0" No_argument "i"
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"unset\0" Required_argument "u"
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;
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#endif
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int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int env_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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llist_t *unset_env = NULL;
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#if ENABLE_FEATURE_ENV_LONG_OPTIONS
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applet_long_options = env_longopts;
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#endif
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opts = getopt32(argv, "+iu:+", &unset_env);
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argv += optind;
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if (argv[0] && LONE_DASH(argv[0])) {
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opts |= 1;
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++argv;
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}
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if (opts & 1) {
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clearenv();
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}
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while (unset_env) {
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char *var = llist_pop(&unset_env);
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/* This does not handle -uVAR=VAL
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* (coreutils _sets_ the variable in that case): */
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/*unsetenv(var);*/
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/* This does, but uses somewhan undocumented feature that
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* putenv("name_without_equal_sign") unsets the variable: */
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putenv(var);
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}
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while (*argv && (strchr(*argv, '=') != NULL)) {
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if (putenv(*argv) < 0) {
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bb_perror_msg_and_die("putenv");
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}
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++argv;
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}
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if (argv[0]) {
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BB_EXECVP_or_die(argv);
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}
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if (environ) { /* clearenv() may set environ == NULL! */
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char **ep;
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for (ep = environ; *ep; ep++) {
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puts(*ep);
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}
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}
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
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* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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*
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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