mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-30 00:11:59 +00:00
141 lines
3.5 KiB
Go
141 lines
3.5 KiB
Go
/**
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# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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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 chmod
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import (
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"fmt"
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"path/filepath"
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"strings"
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"syscall"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
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"github.com/sirupsen/logrus"
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"github.com/urfave/cli/v2"
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)
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type command struct {
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logger *logrus.Logger
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}
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type config struct {
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paths cli.StringSlice
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mode string
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containerSpec string
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}
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// NewCommand constructs a chmod command with the specified logger
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func NewCommand(logger *logrus.Logger) *cli.Command {
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c := command{
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logger: logger,
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}
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return c.build()
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}
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// build the chmod command
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func (m command) build() *cli.Command {
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cfg := config{}
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// Create the 'chmod' command
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c := cli.Command{
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Name: "chmod",
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Usage: "Set the permissions of folders in the container by running chmod. The container root is prefixed to the specified paths.",
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Before: func(c *cli.Context) error {
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return validateFlags(c, &cfg)
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},
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Action: func(c *cli.Context) error {
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return m.run(c, &cfg)
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},
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}
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c.Flags = []cli.Flag{
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&cli.StringSliceFlag{
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Name: "path",
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Usage: "Specifiy a path to apply the specified mode to",
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Destination: &cfg.paths,
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},
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&cli.StringFlag{
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Name: "mode",
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Usage: "Specify the file mode",
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Destination: &cfg.mode,
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},
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&cli.StringFlag{
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Name: "container-spec",
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Usage: "Specify the path to the OCI container spec. If empty or '-' the spec will be read from STDIN",
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Destination: &cfg.containerSpec,
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},
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}
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return &c
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}
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func validateFlags(c *cli.Context, cfg *config) error {
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if strings.TrimSpace(cfg.mode) == "" {
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return fmt.Errorf("a non-empty mode must be specified")
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}
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for _, p := range cfg.paths.Value() {
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if strings.TrimSpace(p) == "" {
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return fmt.Errorf("paths must not be empty")
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}
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}
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return nil
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}
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func (m command) run(c *cli.Context, cfg *config) error {
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s, err := oci.LoadContainerState(cfg.containerSpec)
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if err != nil {
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return fmt.Errorf("failed to load container state: %v", err)
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}
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containerRoot, err := s.GetContainerRoot()
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if err != nil {
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return fmt.Errorf("failed to determined container root: %v", err)
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}
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if containerRoot == "" {
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return fmt.Errorf("empty container root detected")
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}
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paths := m.getPaths(containerRoot, cfg.paths.Value())
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if len(paths) == 0 {
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m.logger.Debugf("No paths specified; exiting")
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return nil
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}
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locator := lookup.NewExecutableLocator(m.logger, "")
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targets, err := locator.Locate("chmod")
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if err != nil {
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return fmt.Errorf("failed to locate chmod: %v", err)
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}
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chmodPath := targets[0]
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args := append([]string{filepath.Base(chmodPath), cfg.mode}, paths...)
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return syscall.Exec(chmodPath, args, nil)
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}
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// getPaths updates the specified paths relative to the root.
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func (m command) getPaths(root string, paths []string) []string {
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var pathsInRoot []string
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for _, f := range paths {
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pathsInRoot = append(pathsInRoot, filepath.Join(root, f))
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}
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return pathsInRoot
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}
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