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60 lines
2 KiB
Go
60 lines
2 KiB
Go
package system // import "github.com/docker/docker/pkg/system"
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import (
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"fmt"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/containerd/continuity/pathdriver"
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)
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const defaultUnixPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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// DefaultPathEnv is unix style list of directories to search for
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// executables. Each directory is separated from the next by a colon
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// ':' character .
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func DefaultPathEnv(os string) string {
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if runtime.GOOS == "windows" {
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if os != runtime.GOOS {
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return defaultUnixPathEnv
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}
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// Deliberately empty on Windows containers on Windows as the default path will be set by
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// the container. Docker has no context of what the default path should be.
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return ""
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}
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return defaultUnixPathEnv
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}
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// CheckSystemDriveAndRemoveDriveLetter verifies that a path, if it includes a drive letter,
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// is the system drive.
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// On Linux: this is a no-op.
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// On Windows: this does the following>
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// CheckSystemDriveAndRemoveDriveLetter verifies and manipulates a Windows path.
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// This is used, for example, when validating a user provided path in docker cp.
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// If a drive letter is supplied, it must be the system drive. The drive letter
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// is always removed. Also, it translates it to OS semantics (IOW / to \). We
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// need the path in this syntax so that it can ultimately be concatenated with
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// a Windows long-path which doesn't support drive-letters. Examples:
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// C: --> Fail
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// C:\ --> \
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// a --> a
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// /a --> \a
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// d:\ --> Fail
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func CheckSystemDriveAndRemoveDriveLetter(path string, driver pathdriver.PathDriver) (string, error) {
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if runtime.GOOS != "windows" || LCOWSupported() {
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return path, nil
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}
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if len(path) == 2 && string(path[1]) == ":" {
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return "", fmt.Errorf("No relative path specified in %q", path)
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}
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if !driver.IsAbs(path) || len(path) < 2 {
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return filepath.FromSlash(path), nil
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}
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if string(path[1]) == ":" && !strings.EqualFold(string(path[0]), "c") {
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return "", fmt.Errorf("The specified path is not on the system drive (C:)")
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}
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return filepath.FromSlash(path[2:]), nil
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}
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