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27 lines
1.2 KiB
Go
27 lines
1.2 KiB
Go
package instructions // import "github.com/docker/docker/builder/dockerfile/instructions"
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import (
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"fmt"
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"path/filepath"
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"regexp"
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"strings"
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)
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func errNotJSON(command, original string) error {
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// For Windows users, give a hint if it looks like it might contain
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// a path which hasn't been escaped such as ["c:\windows\system32\prog.exe", "-param"],
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// as JSON must be escaped. Unfortunate...
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//
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// Specifically looking for quote-driveletter-colon-backslash, there's no
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// double backslash and a [] pair. No, this is not perfect, but it doesn't
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// have to be. It's simply a hint to make life a little easier.
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extra := ""
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original = filepath.FromSlash(strings.ToLower(strings.Replace(strings.ToLower(original), strings.ToLower(command)+" ", "", -1)))
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if len(regexp.MustCompile(`"[a-z]:\\.*`).FindStringSubmatch(original)) > 0 &&
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!strings.Contains(original, `\\`) &&
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strings.Contains(original, "[") &&
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strings.Contains(original, "]") {
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extra = fmt.Sprintf(`. It looks like '%s' includes a file path without an escaped back-slash. JSON requires back-slashes to be escaped such as ["c:\\path\\to\\file.exe", "/parameter"]`, original)
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}
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return fmt.Errorf("%s requires the arguments to be in JSON form%s", command, extra)
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}
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