89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright (C) 2011 Colin Walters <walters@verbum.org>
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*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: Colin Walters <walters@verbum.org>
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*/
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#include "config.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/statvfs.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include "ostree-mount-util.h"
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int
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main(int argc, char *argv[])
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{
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const char *remounts[] = { "/sysroot", "/var", NULL };
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struct stat stbuf;
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int i;
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if (path_is_on_readonly_fs ("/"))
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{
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/* If / isn't writable, don't do any remounts; we don't want
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* to clear the readonly flag in that case.
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*/
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exit (EXIT_SUCCESS);
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}
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for (i = 0; remounts[i] != NULL; i++)
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{
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const char *target = remounts[i];
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if (lstat (target, &stbuf) < 0)
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continue;
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/* Silently ignore symbolic links; we expect these to point to
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* /sysroot, and thus there isn't a bind mount there.
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*/
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if (S_ISLNK (stbuf.st_mode))
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continue;
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/* If not a mountpoint, skip it */
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struct statvfs stvfsbuf;
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if (statvfs (target, &stvfsbuf) == -1)
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continue;
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/* If no read-only flag, skip it */
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if ((stvfsbuf.f_flag & ST_RDONLY) == 0)
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continue;
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/* It's a mounted, read-only fs; remount it */
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if (mount (target, target, NULL, MS_REMOUNT | MS_SILENT, NULL) < 0)
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{
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/* Also ignore ENINVAL - if the target isn't a mountpoint
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* already, then assume things are OK.
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*/
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if (errno != EINVAL)
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err (EXIT_FAILURE, "failed to remount %s", target);
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}
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else
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printf ("Remounted: %s\n", target);
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}
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exit (EXIT_SUCCESS);
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}
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