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apk-installed.go
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apk-installed.go
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package lockfile
import (
"bufio"
"fmt"
"os"
"sort"
"strings"
)
const AlpineEcosystem Ecosystem = "Alpine"
func groupApkPackageLines(scanner *bufio.Scanner) [][]string {
var groups [][]string
var group []string
for scanner.Scan() {
line := scanner.Text()
if line != "" {
group = append(group, line)
continue
}
if len(group) > 0 {
groups = append(groups, group)
}
group = make([]string, 0)
}
if len(group) > 0 {
groups = append(groups, group)
}
return groups
}
func parseApkPackageGroup(group []string, pathToLockfile string) PackageDetails {
var pkg = PackageDetails{
Ecosystem: AlpineEcosystem,
CompareAs: AlpineEcosystem,
}
// File SPECS: https://wiki.alpinelinux.org/wiki/Apk_spec
for _, line := range group {
switch {
case strings.HasPrefix(line, "P:"):
pkg.Name = strings.TrimPrefix(line, "P:")
case strings.HasPrefix(line, "V:"):
pkg.Version = strings.TrimPrefix(line, "V:")
case strings.HasPrefix(line, "c:"):
pkg.Commit = strings.TrimPrefix(line, "c:")
}
}
if pkg.Version == "" {
pkgPrintName := pkg.Name
if pkgPrintName == "" {
pkgPrintName = unknownPkgName
}
_, _ = fmt.Fprintf(
os.Stderr,
"warning: malformed APK installed file. Found no version number in record. Package %s. File: %s\n",
pkgPrintName,
pathToLockfile,
)
}
return pkg
}
func ParseApkInstalled(pathToLockfile string) ([]PackageDetails, error) {
file, err := os.Open(pathToLockfile)
if err != nil {
return []PackageDetails{}, fmt.Errorf("could not open %s: %w", pathToLockfile, err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
packageGroups := groupApkPackageLines(scanner)
packages := make([]PackageDetails, 0, len(packageGroups))
for _, group := range packageGroups {
pkg := parseApkPackageGroup(group, pathToLockfile)
if pkg.Name == "" {
_, _ = fmt.Fprintf(
os.Stderr,
"warning: malformed APK installed file. Found no package name in record. File: %s\n",
pathToLockfile,
)
continue
}
packages = append(packages, pkg)
}
if err := scanner.Err(); err != nil {
return packages, fmt.Errorf("error while scanning %s: %w", pathToLockfile, err)
}
return packages, nil
}
// FromApkInstalled attempts to parse the given file as an "apk-installed" lockfile
// used by the Alpine Package Keeper (apk) to record installed packages.
func FromApkInstalled(pathToInstalled string) (Lockfile, error) {
packages, err := ParseApkInstalled(pathToInstalled)
sort.Slice(packages, func(i, j int) bool {
if packages[i].Name == packages[j].Name {
return packages[i].Version < packages[j].Version
}
return packages[i].Name < packages[j].Name
})
return Lockfile{
FilePath: pathToInstalled,
ParsedAs: "apk-installed",
Packages: packages,
}, err
}