zabio3/godolint

package rules

import (
    "strings"

    "github.com/moby/buildkit/frontend/dockerfile/parser"
)

// validateDL3015 Avoid additional packages by specifying --no-install-recommends.
func validateDL3015(node *parser.Node) (rst []ValidateResult, err error) {
    for _, child := range node.Children {
        if child.Value == RUN {
            var isAptGet, isInstalled bool
            length := len(rst)
            for _, v := range strings.Fields(child.Next.Value) {
                switch v {
                case "apt-get":
                    isAptGet = true
                case "install":
                    if isAptGet {
                        isInstalled = true
                    }
                case "&&":
                    isAptGet, isInstalled = false, false
                default:
                    if isInstalled && v != "--no-install-recommends" && length == len(rst) {
                        rst = append(rst, ValidateResult{line: child.StartLine})
                    }
                    isAptGet, isInstalled = false, false
                }
            }
        }
    }
    return rst, nil
}