67 lines
2.2 KiB
Go
67 lines
2.2 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fuse
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import (
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"context"
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"fmt"
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)
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// MountedFileSystem represents the status of a mount operation, with a method
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// that waits for unmounting.
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type MountedFileSystem struct {
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dir string
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// The result to return from Join. Not valid until the channel is closed.
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joinStatus error
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joinStatusAvailable chan struct{}
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}
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// Dir returns the directory on which the file system is mounted (or where we
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// attempted to mount it.)
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func (mfs *MountedFileSystem) Dir() string {
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return mfs.dir
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}
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// Join blocks until a mounted file system has been unmounted. It does not
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// return successfully until all ops read from the connection have been
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// responded to (i.e. the file system server has finished processing all
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// in-flight ops).
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//
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// The return value will be non-nil if anything unexpected happened while
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// serving. May be called multiple times.
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func (mfs *MountedFileSystem) Join(ctx context.Context) error {
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select {
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case <-mfs.joinStatusAvailable:
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return mfs.joinStatus
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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// GetFuseContext implements the equiv. of FUSE-C fuse_get_context() and thus
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// returns the UID / GID / PID associated with all FUSE requests send by the kernel.
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// ctx parameter must be one of the context from the fuseops handlers (e.g.: CreateFile)
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func (mfs *MountedFileSystem) GetFuseContext(ctx context.Context) (uid, gid, pid uint32, err error) {
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foo := ctx.Value(contextKey)
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state, ok := foo.(opState)
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if !ok {
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return 0, 0, 0, fmt.Errorf("GetFuseContext called with invalid context: %#v", ctx)
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}
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inMsg := state.inMsg
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header := inMsg.Header()
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return header.Uid, header.Gid, header.Pid, nil
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}
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