52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/* Determine whether we can write any file.
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Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "write-any-file.h"
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#include "priv-set.h"
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#include "root-uid.h"
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#include <unistd.h>
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/* Return true if we know that we can write any file, including
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writing directories. */
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bool
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can_write_any_file (void)
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{
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static bool initialized;
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static bool can_write;
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if (! initialized)
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{
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bool can = false;
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#if defined PRIV_FILE_DAC_WRITE
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can = (priv_set_ismember (PRIV_FILE_DAC_WRITE) == 1);
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#else
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/* In traditional Unix, only root can unlink directories. */
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can = (geteuid () == ROOT_UID);
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#endif
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can_write = can;
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initialized = true;
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}
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return can_write;
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}
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