podman

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package copy
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import (
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	"fmt"
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	"strings"
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)
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// ParseSourceAndDestination parses the source and destination input into a
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// possibly specified container and path.  The input format is described in
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// podman-cp(1) as "[nameOrID:]path".  Colons in paths are supported as long
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// they start with a dot or slash.
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//
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// It returns, in order, the source container and path, followed by the
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// destination container and path, and an error.  Note that exactly one
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// container must be specified.
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func ParseSourceAndDestination(source, destination string) (string, string, string, string, error) {
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	sourceContainer, sourcePath := parseUserInput(source)
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	destContainer, destPath := parseUserInput(destination)
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	if len(sourcePath) == 0 || len(destPath) == 0 {
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		return "", "", "", "", fmt.Errorf("invalid arguments %q, %q: you must specify paths", source, destination)
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	}
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	return sourceContainer, sourcePath, destContainer, destPath, nil
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}
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// parseUserInput parses the input string and returns, if specified, the name
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// or ID of the container and the path.  The input format is described in
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// podman-cp(1) as "[nameOrID:]path".  Colons in paths are supported as long
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// they start with a dot or slash.
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func parseUserInput(input string) (container string, path string) {
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	if len(input) == 0 {
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		return
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	}
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	path = input
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	// If the input starts with a dot or slash, it cannot refer to a
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	// container.
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	if input[0] == '.' || input[0] == '/' {
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		return
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	}
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	if parsedContainer, parsedPath, ok := strings.Cut(path, ":"); ok {
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		container = parsedContainer
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		path = parsedPath
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	}
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	return
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}
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