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66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Return true if the process can perform a chroot operation.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/support.h>
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#include <support/xunistd.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static void
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callback (void *closure)
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{
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int *result = closure;
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struct stat64 before;
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xstat ("/dev", &before);
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if (chroot ("/dev") != 0)
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{
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*result = errno;
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return;
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}
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struct stat64 after;
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xstat ("/", &after);
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TEST_VERIFY (before.st_dev == after.st_dev);
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TEST_VERIFY (before.st_ino == after.st_ino);
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*result = 0;
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}
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bool
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support_can_chroot (void)
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{
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int *result = support_shared_allocate (sizeof (*result));
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*result = 0;
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support_isolate_in_subprocess (callback, result);
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bool ok = *result == 0;
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if (!ok)
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{
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static bool already_warned;
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if (!already_warned)
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{
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already_warned = true;
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errno = *result;
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printf ("warning: this process does not support chroot: %m\n");
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}
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}
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support_shared_free (result);
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return ok;
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}
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