[node-patches] Change in ovirt-node[master]: utils_fs: Add mount/umount c bindings

[asegurap at redhat.com]

Antoni Segura Puimedon has uploaded a new change for review.

Change subject: utils_fs: Add mount/umount c bindings
......................................................................

utils_fs: Add mount/umount c bindings

This commit adds ctypes bindings for the glibc mount and umount
methods so that we do not need to branch out to the cli for our
mounting and unmounting needs. It also raises the appropriate
OSError with code and message when it fails.

Change-Id: I48d2a14a37811c1f7c952c0485c4dd9ffb981d44
Signed-off-by: Antoni S. Puimedon <asegurap at redhat.com>
---
A src/ovirt/node/utils/fs/mount.py
1 file changed, 85 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.ovirt.org:29418/ovirt-node refs/changes/00/29000/1

diff --git a/src/ovirt/node/utils/fs/mount.py b/src/ovirt/node/utils/fs/mount.py
new file mode 100644
index 0000000..068dd41
--- /dev/null
+++ b/src/ovirt/node/utils/fs/mount.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+#
+# mount.py - Copyright (C) 2014 Red Hat, Inc.
+# Written by Antoni Segura Puimedon <asegurap at redhat.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA  02110-1301, USA.  A copy of the GNU General Public License is
+# also available at http://www.gnu.org/copyleft/gpl.html.
+
+"""
+File system mounting bindings
+"""
+
+import ctypes
+import os
+
+LIBC = ctypes.CDLL('libc.so.6', use_errno=True)
+
+MS_RDONLY = 1  # Mount read-only.
+MS_NOSUID = 2  # Ignore suid and sgid bits.
+MS_NODEV = 4  # Disallow access to device special files.
+MS_NOEXEC = 8  # Disallow program execution.
+MS_SYNCHRONOUS = 16  # Writes are synced at once.
+MS_REMOUNT = 32  # Alter flags of a mounted FS.
+MS_MANDLOCK = 64  # Allow mandatory locks on an FS.
+MS_DIRSYNC = 128  # Directory modifications are synchronous.
+MS_NOATIME = 1024  # Do not update access times.
+MS_NODIRATIME = 2048  # Do not update directory access times.
+MS_BIND = 4096  # Bind directory at different place.
+MS_MOVE = 8192  # Atomically move a subtree to a new location
+MS_REC = 16384  # Recurse
+MS_SILENT = 32768  # Suppress kernel printk warnings
+MS_POSIXACL = 1 << 16  # VFS does not apply the umask.
+MS_UNBINDABLE = 1 << 17  # Change to unbindable.
+MS_PRIVATE = 1 << 18  # Change to private.
+MS_SLAVE = 1 << 19  # Change to slave.
+MS_SHARED = 1 << 20  # Change to shared.
+MS_RELATIME = 1 << 21  # Update atime relative to mtime/ctime.
+MS_KERNMOUNT = 1 << 22  # This is a kern_mount call.
+MS_I_VERSION = 1 << 23  # Update inode I_version field.
+MS_STRICTATIME = 1 << 24  # Always perform atime updates.
+
+
+def mount(source, target, fstype='', flags=0L, data=None):
+    """Mount a filesystem source to the target of type fstype"""
+    ret = _mount(source, target, fstype, flags, data)
+    if ret == -1:
+        errno = ctypes.get_errno()
+        raise OSError(errno, os.strerror(errno))
+
+
+def umount(target):
+    """Unmount a target filesystem mount"""
+    ret = _umount(target)
+    if ret == -1:
+        errno = ctypes.get_errno()
+        raise OSError(errno, os.strerror(errno))
+
+
+_mount = ctypes.CFUNCTYPE(
+    ctypes.c_int,  # ret
+    ctypes.c_char_p,  # source
+    ctypes.c_char_p,  # target
+    ctypes.c_char_p,  # filesystem type
+    ctypes.c_ulong,  # mount flags
+    ctypes.c_void_p,  # data (fs specific)
+    use_errno=True)(('mount', LIBC))
+
+
+_umount = ctypes.CFUNCTYPE(
+    ctypes.c_int,  # ret
+    ctypes.c_char_p,  # target
+    use_errno=True)(('umount', LIBC))


-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I48d2a14a37811c1f7c952c0485c4dd9ffb981d44
Gerrit-PatchSet: 1
Gerrit-Project: ovirt-node
Gerrit-Branch: master
Gerrit-Owner: Antoni Segura Puimedon <asegurap at redhat.com>