talos/pkg/safepath/safepath.go
Dmitriy Matrenichev 93e55b85f2
chore: bump golangci-lint to v1.50.0
I had to do several things:
- contextcheck now supports Go 1.18 generics, but I had to disable it because of this https://github.com/kkHAIKE/contextcheck/issues/9
- dupword produces to many false positives, so it's also disabled
- revive found all packages which didn't have a documentation comment before. And tehre is A LOT of them. I updated some of them, but gave up at some point and just added them to exclude rules for now.
- change lint-vulncheck to use `base` stage as base

Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>
2022-10-20 18:33:19 +03:00

41 lines
1.5 KiB
Go

// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Package safepath provides a set of functions to make paths safe for use with.
package safepath
import (
"os"
"path/filepath"
)
// CleanPath makes a path safe for use with filepath.Join. This is done by not
// only cleaning the path, but also (if the path is relative) adding a leading
// '/' and cleaning it (then removing the leading '/'). This ensures that a
// path resulting from prepending another path will always resolve to lexically
// be a subdirectory of the prefixed path. This is all done lexically, so paths
// that include symlinks won't be safe as a result of using CleanPath.
func CleanPath(path string) string {
// Deal with empty strings nicely.
if path == "" {
return ""
}
// Ensure that all paths are cleaned (especially problematic ones like
// "/../../../../../" which can cause lots of issues).
path = filepath.Clean(path)
// If the path isn't absolute, we need to do more processing to fix paths
// such as "../../../../<etc>/some/path". We also shouldn't convert absolute
// paths to relative ones.
if !filepath.IsAbs(path) {
path = filepath.Clean(string(os.PathSeparator) + path)
// This can't fail, as (by definition) all paths are relative to root.
path, _ = filepath.Rel(string(os.PathSeparator), path) //nolint:errcheck
}
// Clean the path again for good measure.
return filepath.Clean(path)
}