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/*
libfakechroot -- fake chroot environment
Copyright (c) 2013 Piotr Roszatycki <dexter@debian.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <config.h>
#ifdef HAVE_CLEARENV
#ifndef __GLIBC__
extern char **environ;
#endif
#define _GNU_SOURCE 1
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#endif
#include "libfakechroot.h"
extern int __clearenv(void);
wrapper(clearenv, int, (void))
{
int j, n;
char *key, *env;
char **tmpkey, **tmpenv;
debug("clearenv()");
/* Preserve old environment variables */
tmpkey = alloca( (preserve_env_list_count + 1) * sizeof (char *) );
tmpenv = alloca( (preserve_env_list_count + 1) * sizeof (char *) );
for (j = 0, n = 0; j < preserve_env_list_count; j++) {
key = preserve_env_list[j];
env = getenv(key);
if (env != NULL) {
tmpkey[n] = alloca(strlen(key) + 1);
tmpenv[n] = alloca(strlen(env) + 1);
strcpy(tmpkey[n], key);
strcpy(tmpenv[n], env);
n++;
}
}
tmpkey[n] = NULL;
tmpenv[n] = NULL;
/* Clear */
__clearenv();
/* Set one variable explicitly so environ won't be NULL */
setenv("FAKECHROOT", "true", 0);
/* Recover preserved variables */
for (n = 0; tmpkey[n]; n++) {
if (setenv(tmpkey[n], tmpenv[n], 1) != 0) {
return -1;
}
}
return 0;
}
#else
typedef int empty_translation_unit;
#endif
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