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requirements.go
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package requirements
import (
"os"
"path/filepath"
"regexp"
"strings"
"github.com/cloudfoundry/libbuildpack"
)
const requirementsParserRegex = `(?m)^[\w\-\w\[\]]+`
type Reqs struct{}
func (m Reqs) FindAnyPackage(buildDir string, searchedPackages ...string) (bool, error) {
requirementsPath := filepath.Join(buildDir, "requirements.txt")
requirementsFileExists, err := libbuildpack.FileExists(requirementsPath)
if err != nil {
return false, err
}
if requirementsFileExists {
reqPackages, err := parseRequirementsWithoutVersion(requirementsPath)
if err != nil {
return false, err
}
for _, searchedPackage := range searchedPackages {
if containsPackage(reqPackages, searchedPackage) {
return true, nil
}
}
}
return false, nil
}
func (m Reqs) FindStalePackages(oldRequirementsPath, newRequirementsPath string, excludedPackages ...string) ([]string, error) {
var stalePackages []string
oldRequirementsExists, err := libbuildpack.FileExists(oldRequirementsPath)
if err != nil {
return nil, err
}
newRequirementsExists, err := libbuildpack.FileExists(newRequirementsPath)
if err != nil {
return nil, err
}
if oldRequirementsExists && newRequirementsExists {
oldPkgs, err := parseRequirements(oldRequirementsPath)
if err != nil {
return nil, err
}
newPkgs, err := parseRequirements(newRequirementsPath)
if err != nil {
return nil, err
}
for _, oldPkg := range oldPkgs {
if !containsPackage(newPkgs, oldPkg) && !packageIsExcluded(excludedPackages, oldPkg) {
stalePackages = append(stalePackages, oldPkg)
}
}
}
return stalePackages, nil
}
func containsPackage(packages []string, searchedPackage string) bool {
for _, pkg := range packages {
if pkg == searchedPackage {
return true
}
}
return false
}
func packageIsExcluded(excludedPackages []string, packageFullName string) bool {
regex := regexp.MustCompile(requirementsParserRegex)
packageWithoutVersion := regex.FindString(packageFullName)
for _, excludedPackage := range excludedPackages {
if packageWithoutVersion == excludedPackage {
return true
}
}
return false
}
func parseRequirements(requirementsPath string) ([]string, error) {
content, err := os.ReadFile(requirementsPath)
if err != nil {
return nil, err
}
requirements := strings.Split(string(content), "\n")
for _, requirement := range requirements {
if strings.HasPrefix(requirement, "-r ") {
requirement = strings.TrimPrefix(requirement, "-r ")
nestedReqs, err := parseRequirements(strings.ReplaceAll(requirementsPath, filepath.Base(requirementsPath), requirement))
if err != nil {
return nil, err
}
requirements = append(requirements, nestedReqs...)
}
}
return requirements, nil
}
func parseRequirementsWithoutVersion(requirementsPath string) ([]string, error) {
parsedRequirements, err := parseRequirements(requirementsPath)
if err != nil {
return nil, err
}
regex := regexp.MustCompile(`(?m)^[\w\-\w\[\]]+`)
return regex.FindAllString(strings.Join(parsedRequirements, "\n"), -1), nil
}