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package copy
import (
"strings"
"github.com/pkg/errors"
)
// ParseSourceAndDestination parses the source and destination input into a
// possibly specified container and path. The input format is described in
// podman-cp(1) as "[nameOrID:]path". Colons in paths are supported as long
// they start with a dot or slash.
//
// It returns, in order, the source container and path, followed by the
// destination container and path, and an error. Note that exactly one
// container must be specified.
func ParseSourceAndDestination(source, destination string) (string, string, string, string, error) {
sourceContainer, sourcePath := parseUserInput(source)
destContainer, destPath := parseUserInput(destination)
numContainers := 0
if len(sourceContainer) > 0 {
numContainers++
}
if len(destContainer) > 0 {
numContainers++
}
if numContainers != 1 {
return "", "", "", "", errors.Errorf("invalid arguments %q, %q: exactly 1 container expected but %d specified", source, destination, numContainers)
}
if len(sourcePath) == 0 || len(destPath) == 0 {
return "", "", "", "", errors.Errorf("invalid arguments %q, %q: you must specify paths", source, destination)
}
return sourceContainer, sourcePath, destContainer, destPath, nil
}
// parseUserInput parses the input string and returns, if specified, the name
// or ID of the container and the path. The input format is described in
// podman-cp(1) as "[nameOrID:]path". Colons in paths are supported as long
// they start with a dot or slash.
func parseUserInput(input string) (container string, path string) {
if len(input) == 0 {
return
}
path = input
// If the input starts with a dot or slash, it cannot refer to a
// container.
if input[0] == '.' || input[0] == '/' {
return
}
if spl := strings.SplitN(path, ":", 2); len(spl) == 2 {
container = spl[0]
path = spl[1]
}
return
}
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