mirror of https://github.com/stashapp/stash.git
81 lines
3.0 KiB
Go
81 lines
3.0 KiB
Go
// Modified from github.com/facebookgo/symwalk
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// BSD License
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// For symwalk software
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// Copyright (c) 2015, Facebook, Inc. All rights reserved.
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name Facebook nor the names of its contributors may be used to
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// endorse or promote products derived from this software without specific
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// prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package fsutil
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import (
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"os"
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"path/filepath"
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)
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// symwalkFunc calls the provided WalkFn for regular files.
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// However, when it encounters a symbolic link, it resolves the link fully using the
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// filepath.EvalSymlinks function and recursively calls symwalk.Walk on the resolved path.
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// This ensures that unlink filepath.Walk, traversal does not stop at symbolic links.
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//
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// Note that symwalk.Walk does not terminate if there are any non-terminating loops in
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// the file structure.
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func walk(filename string, linkDirname string, walkFn filepath.WalkFunc) error {
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symWalkFunc := func(path string, info os.FileInfo, err error) error {
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if fname, err := filepath.Rel(filename, path); err == nil {
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path = filepath.Join(linkDirname, fname)
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} else {
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return err
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}
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if err == nil && info.Mode()&os.ModeSymlink == os.ModeSymlink {
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finalPath, err := filepath.EvalSymlinks(path)
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if err != nil {
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// don't bail out if symlink is invalid
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return walkFn(path, info, err)
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}
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info, err := os.Lstat(finalPath)
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if err != nil {
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return walkFn(path, info, err)
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}
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if info.IsDir() {
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return walk(finalPath, path, walkFn)
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}
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}
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return walkFn(path, info, err)
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}
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return filepath.Walk(filename, symWalkFunc)
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}
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// SymWalk extends filepath.Walk to also follow symlinks
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func SymWalk(path string, walkFn filepath.WalkFunc) error {
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return walk(path, path, walkFn)
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}
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