134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
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*
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* Copyright (C) 2014 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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#include "config.h"
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#include "ostree-linuxfsutil.h"
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#include "otutil.h"
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <ext2fs/ext2_fs.h>
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/**
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* _ostree_linuxfs_fd_alter_immutable_flag:
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* @fd: A file descriptor
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* @new_immutable_state: Set this to %TRUE to make the file immutable, %FALSE to unset the flag
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* @cancellable: Cancellable
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* @error: GError
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*
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* Alter the immutable flag of object referred to by @fd; may be a
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* regular file or a directory.
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*
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* If the operation is not supported by the underlying filesystem, or
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* we are running without sufficient privileges, this function will
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* silently do nothing.
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*/
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gboolean
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_ostree_linuxfs_fd_alter_immutable_flag (int fd,
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gboolean new_immutable_state,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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unsigned long flags;
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int r;
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static gint no_alter_immutable = 0;
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if (g_atomic_int_get (&no_alter_immutable))
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return TRUE;
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r = ioctl (fd, EXT2_IOC_GETFLAGS, &flags);
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if (r == -1)
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{
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int errsv = errno;
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if (errsv == EPERM)
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g_atomic_int_set (&no_alter_immutable, 1);
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else if (errsv == EOPNOTSUPP || errsv == ENOTTY)
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;
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else
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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"ioctl(EXT2_IOC_GETFLAGS): %s",
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g_strerror (errsv));
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goto out;
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}
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}
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else
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{
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if (new_immutable_state)
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flags |= EXT2_IMMUTABLE_FL;
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else
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flags &= ~EXT2_IMMUTABLE_FL;
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r = ioctl (fd, EXT2_IOC_SETFLAGS, &flags);
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if (r == -1)
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{
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int errsv = errno;
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if (errsv == EPERM)
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g_atomic_int_set (&no_alter_immutable, 1);
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else if (errsv == EOPNOTSUPP || errsv == ENOTTY)
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;
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else
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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"ioctl(EXT2_IOC_GETFLAGS): %s",
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g_strerror (errsv));
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goto out;
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}
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}
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}
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ret = TRUE;
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out:
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return ret;
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}
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gboolean
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_ostree_linuxfs_alter_immutable_flag (GFile *path,
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gboolean new_immutable_state,
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GCancellable *cancellable,
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GError **error)
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{
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gboolean ret = FALSE;
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glnx_fd_close int fd = -1;
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if (g_cancellable_set_error_if_cancelled (cancellable, error))
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return FALSE;
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fd = open (gs_file_get_path_cached (path), O_RDONLY|O_NONBLOCK|O_LARGEFILE);
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if (fd == -1)
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{
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int errsv = errno;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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"open(%s): %s",
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gs_file_get_path_cached (path),
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g_strerror (errsv));
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goto out;
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}
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if (!_ostree_linuxfs_fd_alter_immutable_flag (fd, new_immutable_state,
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cancellable, error))
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goto out;
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ret = TRUE;
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out:
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return ret;
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}
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