Marcus Folkesson
6bf4b3e1d8
SPDX License List is a list of (common) open source licenses that can be referred to by a “short identifier”. It has several advantages compared to the common "license header texts" usually found in source files. Some of the advantages: * It is precise; there is no ambiguity due to variations in license header text * It is language neutral * It is easy to machine process * It is concise * It is simple and can be used without much cost in interpreted environments like java Script, etc. * An SPDX license identifier is immutable. * It provides simple guidance for developers who want to make sure the license for their code is respected See http://spdx.org for further reading. Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com> Closes: #1439 Approved by: cgwalters
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
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* Copyright (C) 2014 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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#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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#include "otutil.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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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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unsigned long flags;
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int r = ioctl (fd, EXT2_IOC_GETFLAGS, &flags);
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if (r == -1)
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{
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if (errno == EPERM)
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g_atomic_int_set (&no_alter_immutable, 1);
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else if (errno == EOPNOTSUPP || errno == ENOTTY)
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;
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else
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return glnx_throw_errno_prefix (error, "ioctl(EXT2_IOC_GETFLAGS)");
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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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if (errno == EPERM)
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g_atomic_int_set (&no_alter_immutable, 1);
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else if (errno == EOPNOTSUPP || errno == ENOTTY)
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;
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else
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return glnx_throw_errno_prefix (error, "ioctl(EXT2_IOC_SETFLAGS)");
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}
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}
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return TRUE;
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}
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