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parse_portage_contents.go
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/
parse_portage_contents.go
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package gentoo
import (
"bufio"
"fmt"
"path"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/scylladb/go-set/strset"
"github.com/gsoc2/syft/internal/log"
"github.com/gsoc2/syft/syft/artifact"
"github.com/gsoc2/syft/syft/file"
"github.com/gsoc2/syft/syft/pkg"
"github.com/gsoc2/syft/syft/pkg/cataloger/generic"
)
var (
cpvRe = regexp.MustCompile(`/([^/]*/[\w+][\w+-]*)-((\d+)((\.\d+)*)([a-z]?)((_(pre|p|beta|alpha|rc)\d*)*)(-r\d+)?)/CONTENTS$`)
_ generic.Parser = parsePortageContents
)
// parses individual CONTENTS files from the portage flat-file store (e.g. /var/db/pkg/*/*/CONTENTS).
func parsePortageContents(resolver file.Resolver, _ *generic.Environment, reader file.LocationReadCloser) ([]pkg.Package, []artifact.Relationship, error) {
cpvMatch := cpvRe.FindStringSubmatch(reader.Location.RealPath)
if cpvMatch == nil {
return nil, nil, fmt.Errorf("failed to match package and version in %s", reader.Location.RealPath)
}
name, version := cpvMatch[1], cpvMatch[2]
if name == "" || version == "" {
log.WithFields("path", reader.Location.RealPath).Warnf("failed to parse portage name and version")
return nil, nil, nil
}
p := pkg.Package{
Name: name,
Version: version,
PURL: packageURL(name, version),
Locations: file.NewLocationSet(
reader.Location.WithAnnotation(pkg.EvidenceAnnotationKey, pkg.PrimaryEvidenceAnnotation),
),
Type: pkg.PortagePkg,
Metadata: pkg.PortageEntry{
// ensure the default value for a collection is never nil since this may be shown as JSON
Files: make([]pkg.PortageFileRecord, 0),
},
}
addLicenses(resolver, reader.Location, &p)
addSize(resolver, reader.Location, &p)
addFiles(resolver, reader.Location, &p)
p.SetID()
return []pkg.Package{p}, nil, nil
}
func addFiles(resolver file.Resolver, dbLocation file.Location, p *pkg.Package) {
contentsReader, err := resolver.FileContentsByLocation(dbLocation)
if err != nil {
log.WithFields("path", dbLocation.RealPath).Warnf("failed to fetch portage contents (package=%s): %+v", p.Name, err)
return
}
entry, ok := p.Metadata.(pkg.PortageEntry)
if !ok {
return
}
scanner := bufio.NewScanner(contentsReader)
for scanner.Scan() {
line := strings.Trim(scanner.Text(), "\n")
fields := strings.Split(line, " ")
if fields[0] == "obj" {
record := pkg.PortageFileRecord{
Path: fields[1],
}
record.Digest = &file.Digest{
Algorithm: "md5",
Value: fields[2],
}
entry.Files = append(entry.Files, record)
}
}
p.Metadata = entry
p.Locations.Add(dbLocation)
}
func addLicenses(resolver file.Resolver, dbLocation file.Location, p *pkg.Package) {
parentPath := filepath.Dir(dbLocation.RealPath)
location := resolver.RelativeFileByPath(dbLocation, path.Join(parentPath, "LICENSE"))
if location == nil {
return
}
licenseReader, err := resolver.FileContentsByLocation(*location)
if err != nil {
log.WithFields("path", dbLocation.RealPath).Warnf("failed to fetch portage LICENSE: %+v", err)
return
}
findings := strset.New()
scanner := bufio.NewScanner(licenseReader)
scanner.Split(bufio.ScanWords)
for scanner.Scan() {
token := scanner.Text()
if token != "||" && token != "(" && token != ")" {
findings.Add(token)
}
}
licenseCandidates := findings.List()
p.Licenses = pkg.NewLicenseSet(pkg.NewLicensesFromLocation(*location, licenseCandidates...)...)
p.Locations.Add(location.WithAnnotation(pkg.EvidenceAnnotationKey, pkg.SupportingEvidenceAnnotation))
}
func addSize(resolver file.Resolver, dbLocation file.Location, p *pkg.Package) {
parentPath := filepath.Dir(dbLocation.RealPath)
location := resolver.RelativeFileByPath(dbLocation, path.Join(parentPath, "SIZE"))
if location == nil {
return
}
entry, ok := p.Metadata.(pkg.PortageEntry)
if !ok {
return
}
sizeReader, err := resolver.FileContentsByLocation(*location)
if err != nil {
log.WithFields("name", p.Name).Warnf("failed to fetch portage SIZE: %+v", err)
return
}
scanner := bufio.NewScanner(sizeReader)
for scanner.Scan() {
line := strings.Trim(scanner.Text(), "\n")
size, err := strconv.Atoi(line)
if err == nil {
entry.InstalledSize = size
}
}
p.Metadata = entry
p.Locations.Add(location.WithAnnotation(pkg.EvidenceAnnotationKey, pkg.SupportingEvidenceAnnotation))
}