The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
This change splits the definition of pkg/cri/os.ResolveSymbolicLink by
platform (windows/!windows), and switches to an alternate implementation
for Windows. This aims to fix the issue described in containerd/containerd#5405.
The previous implementation which just called filepath.EvalSymlinks has
historically had issues on Windows. One of these issues we were able to
fix in Go, but EvalSymlinks's behavior is not well specified on
Windows, and there could easily be more issues in the future, so it
seems prudent to move to a separate implementation for Windows.
The new implementation uses the Windows GetFinalPathNameByHandle API,
which takes a handle to an open file or directory and some flags, and
returns the "real" name for the object. See comments in the code for
details on the implementation.
I have tested this change with a variety of mounts and everything seems
to work as expected. Functions that make incorrect assumptions on what a
Windows path can look like may have some trouble with the \\?\ path
syntax. For instance EvalSymlinks fails when given a \\?\UNC\ path. For
this reason, the resolvePath implementation modifies the returned path
to translate to the more common form (\\?\UNC\server\share ->
\\server\share).
Signed-off-by: Kevin Parsons <kevpar@microsoft.com>
1. Currently, Unmount() call takes a burden to parse the whole nine yards
of /proc/self/mountinfo to figure out whether the given mount point is
mounted or not (and returns an error in case parsing fails somehow).
Instead, let's just call umount() and ignore EINVAL, which results
in the same behavior, but much better performance.
This also introduces a slight change: in case target does not exist,
the appropriate error (ENOENT) is returned -- document that.
2. As Unmount() is always used with MNT_DETACH flag, let's drop the
flags argument. This way, the only reason of EINVAL returned from
umount(2) can only be "target is not mounted".
3. While at it, remove the 'containerdmount' alias from the package.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
I implemented /dev/disk/by-uuid on my platform but using absolute links (where
udev typically uses relative) which broke the code in `os.DeviceUUID`.
Rather than just patch that up directly instead stat both the target and
candidate devices and pick one with matching major:minor in st_rdev. This saves
manually building paths to resolve symlinks and I think should be more robust
overall.
I also removed the initial stat of /dev/disk/by-uuid, I believe
`ioutil.Readdir` will correctly return an error if the path does not exist.
Signed-off-by: Ian Campbell <ijc@docker.com>
mount with `rshared`, the host path should be shared.
mount with `rslave`, the host pash should be shared or slave.
Signed-off-by: Yanqiang Miao <miao.yanqiang@zte.com.cn>
