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/* vi: set sw=4 ts=4: */
/*
* env implementation for busybox
*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Original copyright notice is retained at the end of this file.
*
* Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
*/
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Fixed bug involving exit return codes if execvp fails. Also added
* output error checking.
*/
/*
* Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
* - correct "-" option usage
* - multiple "-u unsetenv" support
* - GNU long option support
* - use xfunc_error_retval
*/
//config:config ENV
//config: bool "env (4 kb)"
//config: default y
//config: help
//config: env is used to set an environment variable and run
//config: a command; without options it displays the current
//config: environment.
//applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
//kbuild:lib-$(CONFIG_ENV) += env.o
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
//usage:#define env_trivial_usage
//usage: "[-i] [-u NAME]... [-] [NAME=VALUE]... [PROG ARGS]"
// The "-" can occur only once (unlike, say, -i): it terminates option processing,
// so if it is followed by another "-" arg (or any option-looking arg),
// that arg will be taken as PROG (or even as NAME=VALUE, example: "-z=QWE").
//usage:#define env_full_usage "\n\n"
//usage: "Print current environment or run PROG after setting up environment\n"
//usage: "\n -, -i Start with empty environment"
//usage: "\n -u NAME Remove variable from environment"
#include "libbb.h"
int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int env_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opts;
llist_t *unset_env = NULL;
opts = getopt32long(argv, "+iu:*",
"ignore-environment\0" No_argument "i"
"unset\0" Required_argument "u"
, &unset_env
);
argv += optind;
if (argv[0] && LONE_DASH(argv[0])) {
opts |= 1;
++argv;
}
if (opts & 1) {
clearenv();
}
while (unset_env) {
char *var = llist_pop(&unset_env);
/* This does not handle -uVAR=VAL
* (coreutils _sets_ the variable in that case): */
/*unsetenv(var);*/
/* This does, but uses somewhan undocumented feature that
* putenv("name_without_equal_sign") unsets the variable: */
putenv(var);
}
while (*argv && (strchr(*argv, '=') != NULL)) {
if (putenv(*argv) < 0) {
bb_simple_perror_msg_and_die("putenv");
}
++argv;
}
if (argv[0]) {
BB_EXECVP_or_die(argv);
}
if (environ) { /* clearenv() may set environ == NULL! */
char **ep;
for (ep = environ; *ep; ep++) {
puts(*ep);
}
}
fflush_stdout_and_exit(EXIT_SUCCESS);
}
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
*
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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