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/* env.c - Set the environment for command invocation.
*
* Copyright 2012 Tryn Mirell <tryn@mirell.org>
*
* http://opengroup.org/onlinepubs/9699919799/utilities/env.html
*
* Note: env bypasses shell builtins, so don't xexec().
*
* Deviations from posix: "-" argument and -0
USE_ENV(NEWTOY(env, "^i0u*", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(125)))
config ENV
bool "env"
default y
help
usage: env [-i] [-u NAME] [NAME=VALUE...] [COMMAND...]
Set the environment for command invocation, or list environment variables.
-i Clear existing environment
-u NAME Remove NAME from the environment
-0 Use null instead of newline in output
*/
#define FOR_env
#include "toys.h"
GLOBALS(
struct arg_list *u;
)
void env_main(void)
{
char **ev = toys.optargs, **ee = 0, **set QUIET, *path = getenv("PATH");
struct string_list *sl = 0;
struct arg_list *u;
// If first nonoption argument is "-" treat it as -i
if (*ev && **ev == '-' && !(*ev)[1]) {
toys.optflags |= FLAG_i;
ev++;
}
if (FLAG(i)) ee = set = xzalloc(sizeof(void *)*(toys.optc+1));
else for (u = TT.u; u; u = u->next) xunsetenv(u->arg);
for (; *ev; ev++) {
if (strchr(*ev, '=')) {
if (FLAG(i)) *set++ = *ev;
else xsetenv(xstrdup(*ev), 0);
if (!strncmp(*ev, "PATH=", 5)) path=(*ev)+5;
} else {
// unfortunately, posix has no exec combining p and e, so do p ourselves
if (!strchr(*ev, '/') && path) {
errno = ENOENT;
for (sl = find_in_path(path, *ev); sl; sl = sl->next)
execve(sl->str, ev, ee ? : environ);
} else execve(*ev, ev, ee ? : environ);
perror_msg("exec %s", *ev);
_exit(126+(errno == ENOENT));
}
}
for (ev = ee ? : environ; *ev; ev++) xprintf("%s%c", *ev, '\n'*!FLAG(0));
}
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