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https://github.com/opencontainers/runc.git
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Kir Kolyshkin
28cb321887
A lot of filesystem-related stuff happens inside the container root directory, and we have used its name before. It makes sense to pre-open it and use a *os.File handle instead. Function names in internal/pathrs are kept as is for simplicity (and it is an internal package), but they now accept root as *os.File. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
52 lines
2.0 KiB
Go
52 lines
2.0 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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/*
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* Copyright (C) 2024-2025 Aleksa Sarai <cyphar@cyphar.com>
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* Copyright (C) 2024-2025 SUSE LLC
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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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*/
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package pathrs
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import (
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"fmt"
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"os"
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"path/filepath"
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)
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// MkdirAllParentInRoot is like [MkdirAllInRoot] except that it only creates
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// the parent directory of the target path, returning the trailing component so
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// the caller has more flexibility around constructing the final inode.
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//
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// Callers need to be very careful operating on the trailing path, as trivial
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// mistakes like following symlinks can cause security bugs. Most people
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// should probably just use [MkdirAllInRoot] or [CreateInRoot].
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func MkdirAllParentInRoot(root *os.File, unsafePath string, mode os.FileMode) (*os.File, string, error) {
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// MkdirAllInRoot also does hallucinateUnsafePath, but we need to do it
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// here first because when we split unsafePath into (dir, file) components
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// we want to be doing so with the hallucinated path (so that trailing
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// dangling symlinks are treated correctly).
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unsafePath, err := hallucinateUnsafePath(root.Name(), unsafePath)
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if err != nil {
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return nil, "", fmt.Errorf("failed to construct hallucinated target path: %w", err)
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}
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dirPath, filename := filepath.Split(unsafePath)
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if filepath.Join("/", filename) == "/" {
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return nil, "", fmt.Errorf("create parent dir in root subpath %q has bad trailing component %q", unsafePath, filename)
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}
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dirFd, err := MkdirAllInRoot(root, dirPath, mode)
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return dirFd, filename, err
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}
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