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7a7357dae1
This enables docker cp and ADD/COPY docker build support for LCOW. Originally, the graphdriver.Get() interface returned a local path to the container root filesystem. This does not work for LCOW, so the Get() method now returns an interface that LCOW implements to support copying to and from the container. Signed-off-by: Akash Gupta <akagup@microsoft.com>
60 lines
2 KiB
Go
60 lines
2 KiB
Go
package 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(platform string) string {
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if runtime.GOOS == "windows" {
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if platform != runtime.GOOS && LCOWSupported() {
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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 contatenated 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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