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[27.x backport] cli/command/container: use local copy of pkg/system.IsAbs #5699

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merged 1 commit into from
Dec 16, 2024
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[27.x backport] cli/command/container: use local copy of pkg/system.IsAbs #5699

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19 changes: 15 additions & 4 deletions cli/command/container/cp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@ import (
"github.com/docker/cli/cli/streams"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/system"
units "github.com/docker/go-units"
"github.com/morikuni/aec"
"github.com/pkg/errors"
Expand Down Expand Up @@ -235,7 +234,7 @@ func copyFromContainer(ctx context.Context, dockerCli command.Cli, copyConfig cp
// If the destination is a symbolic link, we should follow it.
if err == nil && srcStat.Mode&os.ModeSymlink != 0 {
linkTarget := srcStat.LinkTarget
if !system.IsAbs(linkTarget) {
if !isAbs(linkTarget) {
// Join with the parent directory.
srcParent, _ := archive.SplitPathDirEntry(srcPath)
linkTarget = filepath.Join(srcParent, linkTarget)
Expand Down Expand Up @@ -319,7 +318,7 @@ func copyToContainer(ctx context.Context, dockerCli command.Cli, copyConfig cpCo
// If the destination is a symbolic link, we should evaluate it.
if err == nil && dstStat.Mode&os.ModeSymlink != 0 {
linkTarget := dstStat.LinkTarget
if !system.IsAbs(linkTarget) {
if !isAbs(linkTarget) {
// Join with the parent directory.
dstParent, _ := archive.SplitPathDirEntry(dstPath)
linkTarget = filepath.Join(dstParent, linkTarget)
Expand Down Expand Up @@ -434,7 +433,7 @@ func copyToContainer(ctx context.Context, dockerCli command.Cli, copyConfig cpCo
// client, a `:` could be part of an absolute Windows path, in which case it
// is immediately proceeded by a backslash.
func splitCpArg(arg string) (ctr, path string) {
if system.IsAbs(arg) {
if isAbs(arg) {
// Explicit local absolute path, e.g., `C:\foo` or `/foo`.
return "", arg
}
Expand All @@ -448,3 +447,15 @@ func splitCpArg(arg string) (ctr, path string) {

return ctr, path
}

// IsAbs is a platform-agnostic wrapper for filepath.IsAbs.
//
// On Windows, golang filepath.IsAbs does not consider a path \windows\system32
// as absolute as it doesn't start with a drive-letter/colon combination. However,
// in docker we need to verify things such as WORKDIR /windows/system32 in
// a Dockerfile (which gets translated to \windows\system32 when being processed
// by the daemon). This SHOULD be treated as absolute from a docker processing
// perspective.
func isAbs(path string) bool {
return filepath.IsAbs(path) || strings.HasPrefix(path, string(os.PathSeparator))
}
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