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dockerfile.go
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dockerfile.go
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package parser
import (
"container/list"
"context"
"crypto/md5" // nolint:gosec // backwards compatibility
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"github.com/cirruslabs/cirrus-ci-agent/api"
"github.com/cirruslabs/cirrus-cli/pkg/larker/fs"
"github.com/cirruslabs/cirrus-cli/pkg/parser/dockerfile"
"github.com/cirruslabs/cirrus-cli/pkg/parser/node"
"github.com/cirruslabs/cirrus-cli/pkg/parser/parsererror"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/known/anypb"
"sort"
"strings"
"syscall"
)
var (
ErrFailedToRetrieve = errors.New("failed to retrieve")
ErrFailedToAnalyze = errors.New("failed to analyze")
)
func (p *Parser) calculateDockerfileHashes(
ctx context.Context,
protoTasks []*api.Task,
protoTaskToInstanceNode map[int64]*node.Node,
) error {
for _, protoTask := range protoTasks {
if protoTask.Instance == nil && p.missingInstancesAllowed {
continue
}
dynamicInstance, err := anypb.UnmarshalNew(protoTask.Instance, proto.UnmarshalOptions{})
if errors.Is(err, protoregistry.NotFound) {
continue
}
if err != nil {
return fmt.Errorf("%w: failed to unmarshal task's instance: %v", parsererror.ErrInternal, err)
}
reflectedInstance := dynamicInstance.ProtoReflect()
// Pick up the "dockerfile:" field or skip the task
dockerfileField := reflectedInstance.Descriptor().Fields().ByName("dockerfile")
if dockerfileField == nil || !reflectedInstance.Has(dockerfileField) {
continue
}
dockerfilePath := reflectedInstance.Get(dockerfileField).String()
// Pick up the "docker_arguments:" field, if any
dockerArguments := map[string]string{}
dockerArgumentsField := reflectedInstance.Descriptor().Fields().ByName("docker_arguments")
if dockerArgumentsField != nil && reflectedInstance.Has(dockerArgumentsField) {
dockerArgumentsMap, ok := reflectedInstance.Get(dockerArgumentsField).Interface().(protoreflect.Map)
if ok {
dockerArgumentsMap.Range(func(key protoreflect.MapKey, value protoreflect.Value) bool {
dockerArguments[key.String()] = value.String()
return true
})
}
}
// Retrieve a parser node associated with this instance
// to generate line/column-specific errors and warnings
instanceNode, ok := protoTaskToInstanceNode[protoTask.LocalGroupId]
if !ok {
continue
}
dockerfileNode := instanceNode.FindChild("dockerfile")
if dockerfileNode == nil {
continue
}
// Calculate the Dockerfile hash
dockerfileHash, err := p.calculateDockerfileHash(ctx, dockerfilePath, dockerArguments, dockerfileNode,
protoTask.Environment["CIRRUS_DOCKER_CONTEXT"])
if err != nil {
return err
}
// Save the calculated hash in the properties for (1) the
// service task creation routine and (2) the Cirrus Cloud
protoTask.Metadata.Properties[metadataPropertyDockerfileHash] = dockerfileHash
}
return nil
}
func (p *Parser) calculateDockerfileHash(
ctx context.Context,
dockerfilePath string,
dockerArguments map[string]string,
dockerfileNode *node.Node,
dockerContext string,
) (string, error) {
dockerfileContents, err := p.fs.Get(ctx, dockerfilePath)
if err != nil {
return "", dockerfileNode.ParserError("%v %q: %v", ErrFailedToRetrieve, dockerfilePath, err)
}
// nolint:gosec // backwards compatibility
oldHash := md5.New()
newHash := sha256.New()
// Calculate a shallow hash
oldHash.Write(dockerfileContents)
newHash.Write(dockerfileContents)
hashableArgs := dockerArgumentsToString(dockerArguments)
oldHash.Write([]byte(hashableArgs))
newHash.Write([]byte(hashableArgs))
// Try to calculate a deep hash
sourcePaths, err := dockerfile.LocalContextSourcePaths(ctx, dockerfileContents, dockerArguments)
if err != nil {
p.parserKit.IssueRegistry.RegisterIssuef(api.Issue_WARNING, dockerfileNode.Line, dockerfileNode.Column,
"%v %q: %v", ErrFailedToAnalyze, dockerfilePath, err)
return hex.EncodeToString(oldHash.Sum([]byte{})), nil
}
var hashedAtLeastOneSource bool
for _, sourcePath := range sourcePaths {
if dockerContext != "" {
sourcePath = p.fs.Join(dockerContext, sourcePath)
}
if err := find(ctx, p.fs, sourcePath, func(filePath string, fileContents []byte) {
newHash.Write(fileContents)
hashedAtLeastOneSource = true
}); err != nil {
p.parserKit.IssueRegistry.RegisterIssuef(api.Issue_WARNING, dockerfileNode.Line, dockerfileNode.Column, "%v", err)
}
}
if hashedAtLeastOneSource {
return hex.EncodeToString(newHash.Sum([]byte{})), nil
}
return hex.EncodeToString(oldHash.Sum([]byte{})), nil
}
func dockerArgumentsToString(buildArgs map[string]string) string {
var flattenedArgs []string
for key, value := range buildArgs {
flattenedArgs = append(flattenedArgs, key+value)
}
sort.Strings(flattenedArgs)
return strings.Join(flattenedArgs, ", ")
}
func find(ctx context.Context, fs fs.FileSystem, path string, cb func(path string, contents []byte)) error {
todo := list.New()
todo.PushBack(path)
for todoEntry := todo.Front(); todoEntry != nil; todoEntry = todoEntry.Next() {
todoPath := todo.Remove(todoEntry).(string)
namesInDir, err := fs.ReadDir(ctx, todoPath)
if err != nil {
if errors.Is(err, syscall.ENOTDIR) {
todoContents, err := fs.Get(ctx, todoPath)
if err != nil {
return fmt.Errorf("%w file %q referenced in ADD/COPY instruction: %v",
ErrFailedToRetrieve, todoPath, err)
}
cb(todoPath, todoContents)
continue
}
return fmt.Errorf("%w directory %q referenced in ADD/COPY instruction: %v",
ErrFailedToRetrieve, todoPath, err)
}
for _, name := range namesInDir {
todo.PushBack(fs.Join(todoPath, name))
}
}
return nil
}