103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/*
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* Copyright (C) 2011 Colin Walters <walters@verbum.org>
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*
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* SPDX-License-Identifier: LGPL-2.0+
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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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static void
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do_remount (const char *target)
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{
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struct stat stbuf;
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if (lstat (target, &stbuf) < 0)
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return;
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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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return;
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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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return;
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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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return;
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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 EINVAL - 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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int
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main(int argc, char *argv[])
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{
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/* When systemd is in use this is normally created via the generator, but
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* we ensure it's created here as well for redundancy.
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*/
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touch_run_ostree ();
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/* The /sysroot mount needs to be private to avoid having a mount for e.g. /var/cache
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* also propagate to /sysroot/ostree/deploy/$stateroot/var/cache
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*
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* Today systemd remounts / (recursively) as shared, so we're undoing that as early
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* as possible. See also a copy of this in ostree-prepare-root.c.
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*/
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if (mount ("none", "/sysroot", NULL, MS_REC | MS_PRIVATE, NULL) < 0)
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perror ("warning: While remounting /sysroot MS_PRIVATE");
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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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do_remount ("/sysroot");
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do_remount ("/var");
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exit (EXIT_SUCCESS);
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}
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