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45 lines
1.5 KiB
Go
45 lines
1.5 KiB
Go
package dockerfile
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/docker/docker/pkg/system"
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)
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// normaliseWorkdir normalises a user requested working directory in a
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// platform sematically consistent way.
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func normaliseWorkdir(current string, requested string) (string, error) {
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if requested == "" {
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return "", fmt.Errorf("cannot normalise nothing")
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}
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current = filepath.FromSlash(current)
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requested = filepath.FromSlash(requested)
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// Target semantics is C:\somefolder, specifically in the format:
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// UPPERCASEDriveLetter-Colon-Backslash-FolderName. We are already
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// guaranteed that `current`, if set, is consistent. This allows us to
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// cope correctly with any of the following in a Dockerfile:
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// WORKDIR a --> C:\a
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// WORKDIR c:\\foo --> C:\foo
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// WORKDIR \\foo --> C:\foo
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// WORKDIR /foo --> C:\foo
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// WORKDIR c:\\foo \ WORKDIR bar --> C:\foo --> C:\foo\bar
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// WORKDIR C:/foo \ WORKDIR bar --> C:\foo --> C:\foo\bar
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// WORKDIR C:/foo \ WORKDIR \\bar --> C:\foo --> C:\bar
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// WORKDIR /foo \ WORKDIR c:/bar --> C:\foo --> C:\bar
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if len(current) == 0 || system.IsAbs(requested) {
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if (requested[0] == os.PathSeparator) ||
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(len(requested) > 1 && string(requested[1]) != ":") ||
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(len(requested) == 1) {
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requested = filepath.Join(`C:\`, requested)
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}
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} else {
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requested = filepath.Join(current, requested)
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}
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// Upper-case drive letter
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return (strings.ToUpper(string(requested[0])) + requested[1:]), nil
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}
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