mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2025-04-05 21:15:00 +00:00
Add locators for symlinks and character devices
This change adds a symlink locator that follows symlinks and returns all elements in the chain and a device locator that finds character devices. Signed-off-by: Evan Lezar <elezar@nvidia.com>
This commit is contained in:
parent
8e85e96f38
commit
7c5504a1cf
53
internal/lookup/device.go
Normal file
53
internal/lookup/device.go
Normal file
@ -0,0 +1,53 @@
|
||||
/**
|
||||
# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
**/
|
||||
|
||||
package lookup
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
|
||||
"github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
const (
|
||||
devRoot = "/dev"
|
||||
)
|
||||
|
||||
// NewCharDeviceLocator creates a Locator that can be used to find char devices at the specified root. A logger is
|
||||
// also specified.
|
||||
func NewCharDeviceLocator(logger *logrus.Logger, root string) Locator {
|
||||
l := file{
|
||||
logger: logger,
|
||||
prefixes: []string{root, filepath.Join(root, devRoot)},
|
||||
filter: assertCharDevice,
|
||||
}
|
||||
|
||||
return &l
|
||||
}
|
||||
|
||||
// assertCharDevice checks whether the specified path is a char device and returns an error if this is not the case.
|
||||
func assertCharDevice(filename string) error {
|
||||
info, err := os.Stat(filename)
|
||||
if err != nil {
|
||||
return fmt.Errorf("error getting info: %v", err)
|
||||
}
|
||||
if info.Mode()|os.ModeCharDevice == 0 {
|
||||
return fmt.Errorf("%v is not a char device", filename)
|
||||
}
|
||||
return nil
|
||||
}
|
50
internal/lookup/dir.go
Normal file
50
internal/lookup/dir.go
Normal file
@ -0,0 +1,50 @@
|
||||
/*
|
||||
# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
*/
|
||||
|
||||
package lookup
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
|
||||
log "github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
// NewDirectoryLocator creates a Locator that can be used to find directories at the specified root. A logger
|
||||
// is also specified.
|
||||
func NewDirectoryLocator(logger *log.Logger, root string) Locator {
|
||||
l := file{
|
||||
logger: logger,
|
||||
prefixes: []string{root},
|
||||
filter: assertDirectory,
|
||||
}
|
||||
|
||||
return &l
|
||||
}
|
||||
|
||||
// assertDirectory checks wither the specified path is a directory.
|
||||
func assertDirectory(filename string) error {
|
||||
info, err := os.Stat(filename)
|
||||
if err != nil {
|
||||
return fmt.Errorf("error getting info for %v: %v", filename, err)
|
||||
}
|
||||
|
||||
if !info.IsDir() {
|
||||
return fmt.Errorf("specified path '%v' is not a directory", filename)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
123
internal/lookup/symlinks.go
Normal file
123
internal/lookup/symlinks.go
Normal file
@ -0,0 +1,123 @@
|
||||
/**
|
||||
# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
**/
|
||||
|
||||
package lookup
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
|
||||
"github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
type symlinkChain struct {
|
||||
file
|
||||
}
|
||||
|
||||
type symlink struct {
|
||||
file
|
||||
}
|
||||
|
||||
// NewSymlinkChainLocator creats a locator that can be used for locating files through symlinks.
|
||||
// A logger can also be specified.
|
||||
func NewSymlinkChainLocator(logger *logrus.Logger, root string) Locator {
|
||||
l := symlinkChain{
|
||||
file: newFileLocator(logger, root),
|
||||
}
|
||||
|
||||
return &l
|
||||
}
|
||||
|
||||
// NewSymlinkLocator creats a locator that can be used for locating files through symlinks.
|
||||
// A logger can also be specified.
|
||||
func NewSymlinkLocator(logger *logrus.Logger, root string) Locator {
|
||||
l := symlink{
|
||||
file: newFileLocator(logger, root),
|
||||
}
|
||||
|
||||
return &l
|
||||
}
|
||||
|
||||
// Locate finds the specified file at the specified root. If the file is a symlink, the link is followed and all candidates
|
||||
// to the final target are returned.
|
||||
func (p symlinkChain) Locate(filename string) ([]string, error) {
|
||||
candidates, err := p.file.Locate(filename)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if len(candidates) == 0 {
|
||||
return candidates, nil
|
||||
}
|
||||
|
||||
found := make(map[string]bool)
|
||||
for len(candidates) > 0 {
|
||||
candidate := candidates[0]
|
||||
candidates = candidates[:len(candidates)-1]
|
||||
if found[candidate] {
|
||||
continue
|
||||
}
|
||||
found[candidate] = true
|
||||
|
||||
info, err := os.Lstat(candidate)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to get file info: %v", info)
|
||||
}
|
||||
if info.Mode()&os.ModeSymlink == 0 {
|
||||
continue
|
||||
}
|
||||
target, err := os.Readlink(candidate)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("error checking symlink: %v", err)
|
||||
}
|
||||
|
||||
if !filepath.IsAbs(target) {
|
||||
target, err = filepath.Abs(filepath.Join(filepath.Dir(candidate), target))
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to construct absolute path: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
p.logger.Debugf("Resolved link: '%v' => '%v'", candidate, target)
|
||||
if !found[target] {
|
||||
candidates = append(candidates, target)
|
||||
}
|
||||
}
|
||||
|
||||
var filenames []string
|
||||
for f := range found {
|
||||
filenames = append(filenames, f)
|
||||
}
|
||||
return filenames, nil
|
||||
}
|
||||
|
||||
// Locate finds the specified file at the specified root. If the file is a symlink, the link is resolved and the target returned.
|
||||
func (p symlink) Locate(filename string) ([]string, error) {
|
||||
candidates, err := p.file.Locate(filename)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if len(candidates) != 1 {
|
||||
return nil, fmt.Errorf("failed to uniquely resolve symlink %v: %v", filename, candidates)
|
||||
}
|
||||
|
||||
target, err := filepath.EvalSymlinks(candidates[0])
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to resolve link: %v", err)
|
||||
}
|
||||
|
||||
return []string{target}, err
|
||||
}
|
Loading…
Reference in New Issue
Block a user