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Fix scan issue when encountering invalid symlinks (#871)

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* Implement fixed symwalk algorithm
* Remove dependency
This commit is contained in:
WithoutPants
2020-10-20 17:00:23 +11:00
committed by GitHub
parent 8eda72ad89
commit 872bb70f6e
9 changed files with 81 additions and 148 deletions
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30
vendor/github.com/facebookgo/symwalk/license generated vendored
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BSD License
For symwalk software
Copyright (c) 2015, Facebook, Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name Facebook nor the names of its contributors may be used to
endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

33
vendor/github.com/facebookgo/symwalk/patents generated vendored
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Additional Grant of Patent Rights Version 2
"Software" means the symwalk software distributed by Facebook, Inc.
Facebook, Inc. ("Facebook") hereby grants to each recipient of the Software
("you") a perpetual, worldwide, royalty-free, non-exclusive, irrevocable
(subject to the termination provision below) license under any Necessary
Claims, to make, have made, use, sell, offer to sell, import, and otherwise
transfer the Software. For avoidance of doubt, no license is granted under
Facebook’s rights in any patent claims that are infringed by (i) modifications
to the Software made by you or any third party or (ii) the Software in
combination with any software or other technology.
The license granted hereunder will terminate, automatically and without notice,
if you (or any of your subsidiaries, corporate affiliates or agents) initiate
directly or indirectly, or take a direct financial interest in, any Patent
Assertion: (i) against Facebook or any of its subsidiaries or corporate
affiliates, (ii) against any party if such Patent Assertion arises in whole or
in part from any software, technology, product or service of Facebook or any of
its subsidiaries or corporate affiliates, or (iii) against any party relating
to the Software. Notwithstanding the foregoing, if Facebook or any of its
subsidiaries or corporate affiliates files a lawsuit alleging patent
infringement against you in the first instance, and you respond by filing a
patent infringement counterclaim in that lawsuit against that party that is
unrelated to the Software, the license granted hereunder will not terminate
under section (i) of this paragraph due to such counterclaim.
A "Necessary Claim" is a claim of a patent owned by Facebook that is
necessarily infringed by the Software standing alone.
A "Patent Assertion" is any lawsuit or other action alleging direct, indirect,
or contributory infringement or inducement to infringe any patent, including a
cross-claim or counterclaim.

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vendor/github.com/facebookgo/symwalk/readme.md generated vendored
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symwalk
=======
``` go
import "github.com/facebookgo/symwalk"
```
Package symwalk provides an implementation of symbolic link aware filepath walk.
Walk calls [filepath.Walk](http://golang.org/pkg/path/filepath/#Walk) by providing it with a special WalkFn that wraps the given WalkFn.
This function calls the given WalkFn for regular files.
However, when it encounters a symbolic link, it resolves the link fully using
[filepath.EvalSymlinks](http://golang.org/pkg/path/filepath/#EvalSymlinks) and recursively calls symwalk.Walk on the resolved path.
This ensures that unlike filepath.Walk, traversal does not stop at symbolic links.
Using it can be as simple as:
``` go
Walk(
"/home/me/src",
func(path string, info os.FileInfo, err error) error {
fmt.Println(path)
return nil
},
)
```
**CAVEAT**: Note that symwalk.Walk does not terminate if there are any non-terminating loops in the file structure.

50
vendor/github.com/facebookgo/symwalk/walk.go generated vendored
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// Package symwalk provides an implementation of symbolic link aware filepath walk.
//
// filepath.Walk does not follow symbolic links.
// symwalk.Walk calls filepath.Walk by providing it with a special WalkFn called symWalkFunc.
package symwalk
import (
"os"
"path/filepath"
)
// symwalkFunc calls the provided WalkFn for regular files.
// However, when it encounters a symbolic link, it resolves the link fully using the
// filepath.EvalSymlinks function and recursively calls symwalk.Walk on the resolved path.
// This ensures that unlink filepath.Walk, traversal does not stop at symbolic links.
//
// Note that symwalk.Walk does not terminate if there are any non-terminating loops in
// the file structure.
func walk(filename string, linkDirname string, walkFn filepath.WalkFunc) error {
symWalkFunc := func(path string, info os.FileInfo, err error) error {
if fname, err := filepath.Rel(filename, path); err == nil {
path = filepath.Join(linkDirname, fname)
} else {
return err
}
if err == nil && info.Mode()&os.ModeSymlink == os.ModeSymlink {
finalPath, err := filepath.EvalSymlinks(path)
if err != nil {
return err
}
info, err := os.Lstat(finalPath)
if err != nil {
return walkFn(path, info, err)
}
if info.IsDir() {
return walk(finalPath, path, walkFn)
}
}
return walkFn(path, info, err)
}
return filepath.Walk(filename, symWalkFunc)
}
// Walk extends filepath.Walk to also follow symlinks
func Walk(path string, walkFn filepath.WalkFunc) error {
return walk(path, path, walkFn)
}