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dockerfile.go
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dockerfile.go
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package buildinfo
import (
"context"
"os"
"path/filepath"
"strings"
"github.com/moby/buildkit/frontend/dockerfile/instructions"
"github.com/moby/buildkit/frontend/dockerfile/parser"
"github.com/moby/buildkit/frontend/dockerfile/shell"
"golang.org/x/xerrors"
"github.com/aquasecurity/trivy/pkg/fanal/analyzer"
"github.com/aquasecurity/trivy/pkg/fanal/types"
)
func init() {
analyzer.RegisterAnalyzer(&dockerfileAnalyzer{})
}
const dockerfileAnalyzerVersion = 1
// For Red Hat products
type dockerfileAnalyzer struct{}
func (a dockerfileAnalyzer) Analyze(_ context.Context, target analyzer.AnalysisInput) (*analyzer.AnalysisResult, error) {
// ported from https://github.com/moby/buildkit/blob/b33357bcd2e3319b0323037c900c13b45a228df1/frontend/dockerfile/dockerfile2llb/convert.go#L73
dockerfile, err := parser.Parse(target.Content)
if err != nil {
return nil, xerrors.Errorf("dockerfile parse error: %w", err)
}
stages, metaArgs, err := instructions.Parse(dockerfile.AST)
if err != nil {
return nil, xerrors.Errorf("instruction parse error: %w", err)
}
var args []instructions.KeyValuePairOptional
for _, cmd := range metaArgs {
for _, metaArg := range cmd.Args {
args = append(args, setKVValue(metaArg, nil))
}
}
shlex := shell.NewLex(dockerfile.EscapeToken)
env := metaArgsToMap(args)
var component, arch string
for _, st := range stages {
for _, cmd := range st.Commands {
switch c := cmd.(type) {
case *instructions.EnvCommand:
for _, kvp := range c.Env {
env[kvp.Key] = kvp.Value
}
case *instructions.LabelCommand:
for _, kvp := range c.Labels {
key, err := shlex.ProcessWordWithMap(kvp.Key, env)
if err != nil {
return nil, xerrors.Errorf("unable to evaluate the label '%s': %w", kvp.Key, err)
}
key = strings.ToLower(key)
if key == "com.redhat.component" || key == "bzcomponent" {
component, err = shlex.ProcessWordWithMap(kvp.Value, env)
} else if key == "architecture" {
arch, err = shlex.ProcessWordWithMap(kvp.Value, env)
}
if err != nil {
return nil, xerrors.Errorf("failed to process the label '%s': %w", key, err)
}
}
}
}
}
if component == "" {
return nil, xerrors.New("no component found")
} else if arch == "" {
return nil, xerrors.New("no arch found")
}
return &analyzer.AnalysisResult{
BuildInfo: &types.BuildInfo{
Nvr: component + "-" + parseVersion(target.FilePath),
Arch: arch,
},
}, nil
}
func (a dockerfileAnalyzer) Required(filePath string, _ os.FileInfo) bool {
dir, file := filepath.Split(filepath.ToSlash(filePath))
if dir != "root/buildinfo/" {
return false
}
return strings.HasPrefix(file, "Dockerfile")
}
func (a dockerfileAnalyzer) Type() analyzer.Type {
return analyzer.TypeRedHatDockerfileType
}
func (a dockerfileAnalyzer) Version() int {
return dockerfileAnalyzerVersion
}
// parseVersion parses version from a file name
func parseVersion(nvr string) string {
releaseIndex := strings.LastIndex(nvr, "-")
if releaseIndex < 0 {
return ""
}
versionIndex := strings.LastIndex(nvr[:releaseIndex], "-")
version := nvr[versionIndex+1:]
return version
}
// https://github.com/moby/buildkit/blob/b33357bcd2e3319b0323037c900c13b45a228df1/frontend/dockerfile/dockerfile2llb/convert.go#L474-L482
func metaArgsToMap(metaArgs []instructions.KeyValuePairOptional) map[string]string {
m := make(map[string]string)
for _, arg := range metaArgs {
m[arg.Key] = arg.ValueString()
}
return m
}
func setKVValue(kvpo instructions.KeyValuePairOptional, values map[string]string) instructions.KeyValuePairOptional {
if v, ok := values[kvpo.Key]; ok {
kvpo.Value = &v
}
return kvpo
}