Support specifying command for services (#50)

This PR is to support overwriting the default `CMD` command of `services` containers.

This is a Gitea specific feature and GitHub Actions doesn't support this syntax.

Reviewed-on: https://gitea.com/gitea/act/pulls/50
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-committed-by: Zettat123 <zettat123@gmail.com>

pkg/container/container_types.go

@@ -29,6 +29,8 @@ type NewContainerInput struct {
 
 	// Gitea specific
 	AutoRemove bool
+
+	NetworkAliases []string
 }
 
 // FileEntry is a file to copy to a container
@@ -41,6 +43,7 @@ type FileEntry struct {
 // Container for managing docker run containers
 type Container interface {
 	Create(capAdd []string, capDrop []string) common.Executor
+	ConnectToNetwork(name string) common.Executor
 	Copy(destPath string, files ...*FileEntry) common.Executor
 	CopyDir(destPath string, srcPath string, useGitIgnore bool) common.Executor
 	GetContainerArchive(ctx context.Context, srcPath string) (io.ReadCloser, error)

pkg/container/docker_network.go

@@ -0,0 +1,40 @@
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows))
+
+package container
+
+import (
+	"context"
+
+	"github.com/docker/docker/api/types"
+	"github.com/nektos/act/pkg/common"
+)
+
+func NewDockerNetworkCreateExecutor(name string) common.Executor {
+	return func(ctx context.Context) error {
+		cli, err := GetDockerClient(ctx)
+		if err != nil {
+			return err
+		}
+
+		_, err = cli.NetworkCreate(ctx, name, types.NetworkCreate{
+			Driver: "bridge",
+			Scope:  "local",
+		})
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+}
+
+func NewDockerNetworkRemoveExecutor(name string) common.Executor {
+	return func(ctx context.Context) error {
+		cli, err := GetDockerClient(ctx)
+		if err != nil {
+			return err
+		}
+
+		return cli.NetworkRemove(ctx, name)
+	}
+}

pkg/container/docker_run.go

@@ -16,6 +16,8 @@ import (
 	"strconv"
 	"strings"
 
+	networktypes "github.com/docker/docker/api/types/network"
+
 	"github.com/go-git/go-billy/v5/helper/polyfill"
 	"github.com/go-git/go-billy/v5/osfs"
 	"github.com/go-git/go-git/v5/plumbing/format/gitignore"
@@ -46,6 +48,25 @@ func NewContainer(input *NewContainerInput) ExecutionsEnvironment {
 	return cr
 }
 
+func (cr *containerReference) ConnectToNetwork(name string) common.Executor {
+	return common.
+		NewDebugExecutor("%sdocker network connect %s %s", logPrefix, name, cr.input.Name).
+		Then(
+			common.NewPipelineExecutor(
+				cr.connect(),
+				cr.connectToNetwork(name, cr.input.NetworkAliases),
+			).IfNot(common.Dryrun),
+		)
+}
+
+func (cr *containerReference) connectToNetwork(name string, aliases []string) common.Executor {
+	return func(ctx context.Context) error {
+		return cr.cli.NetworkConnect(ctx, name, cr.input.Name, &networktypes.EndpointSettings{
+			Aliases: aliases,
+		})
+	}
+}
+
 // supportsContainerImagePlatform returns true if the underlying Docker server
 // API version is 1.41 and beyond
 func supportsContainerImagePlatform(ctx context.Context, cli client.APIClient) bool {

pkg/container/docker_stub.go

@@ -55,3 +55,15 @@ func NewDockerVolumeRemoveExecutor(volume string, force bool) common.Executor {
 		return nil
 	}
 }
+
+func NewDockerNetworkCreateExecutor(name string) common.Executor {
+	return func(ctx context.Context) error {
+		return nil
+	}
+}
+
+func NewDockerNetworkRemoveExecutor(name string) common.Executor {
+	return func(ctx context.Context) error {
+		return nil
+	}
+}

pkg/container/host_environment.go

@@ -40,6 +40,12 @@ func (e *HostEnvironment) Create(capAdd []string, capDrop []string) common.Execu
 	}
 }
 
+func (e *HostEnvironment) ConnectToNetwork(name string) common.Executor {
+	return func(ctx context.Context) error {
+		return nil
+	}
+}
+
 func (e *HostEnvironment) Close() common.Executor {
 	return func(ctx context.Context) error {
 		return nil

pkg/exprparser/interpreter.go

@@ -23,6 +23,8 @@ type EvaluationEnvironment struct {
 	Matrix   map[string]interface{}
 	Needs    map[string]Needs
 	Inputs   map[string]interface{}
+
+	Vars map[string]string
 }
 
 type Needs struct {
@@ -181,6 +183,8 @@ func (impl *interperterImpl) evaluateVariable(variableNode *actionlint.VariableN
 		return math.Inf(1), nil
 	case "nan":
 		return math.NaN(), nil
+	case "vars":
+		return impl.env.Vars, nil
 	default:
 		return nil, fmt.Errorf("Unavailable context: %s", variableNode.Name)
 	}

pkg/jobparser/interpeter.go

@@ -62,6 +62,8 @@ func NewInterpeter(
 		Matrix:   matrix,
 		Needs:    using,
 		Inputs:   nil, // not supported yet
+
+		Vars: nil,
 	}
 
 	config := exprparser.Config{

pkg/jobparser/jobparser.go

@@ -42,7 +42,11 @@ func Parse(content []byte, options ...ParseOption) ([]*SingleWorkflow, error) {
 	}
 	for i, id := range ids {
 		job := jobs[i]
-		for _, matrix := range getMatrixes(origin.GetJob(id)) {
+		matricxes, err := getMatrixes(origin.GetJob(id))
+		if err != nil {
+			return nil, fmt.Errorf("getMatrixes: %w", err)
+		}
+		for _, matrix := range matricxes {
 			job := job.Clone()
 			if job.Name == "" {
 				job.Name = id
@@ -89,12 +93,15 @@ type parseContext struct {
 
 type ParseOption func(c *parseContext)
 
-func getMatrixes(job *model.Job) []map[string]interface{} {
+func getMatrixes(job *model.Job) ([]map[string]interface{}, error) {
-	ret := job.GetMatrixes()
+	ret, err := job.GetMatrixes()
+	if err != nil {
+		return nil, fmt.Errorf("GetMatrixes: %w", err)
+	}
 	sort.Slice(ret, func(i, j int) bool {
 		return matrixName(ret[i]) < matrixName(ret[j])
 	})
-	return ret
+	return ret, nil
 }
 
 func encodeMatrix(matrix map[string]interface{}) yaml.Node {

pkg/jobparser/jobparser_test.go

@@ -32,6 +32,21 @@ func TestParse(t *testing.T) {
 			options: nil,
 			wantErr: false,
 		},
+		{
+			name:    "has_with",
+			options: nil,
+			wantErr: false,
+		},
+		{
+			name:    "has_secrets",
+			options: nil,
+			wantErr: false,
+		},
+		{
+			name:    "empty_step",
+			options: nil,
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

pkg/jobparser/model.go

@@ -40,6 +40,13 @@ func (w *SingleWorkflow) jobs() ([]string, []*Job, error) {
 			if err := item.Decode(job); err != nil {
 				return nil, nil, fmt.Errorf("yaml.Unmarshal: %w", err)
 			}
+			steps := make([]*Step, 0, len(job.Steps))
+			for _, s := range job.Steps {
+				if s != nil {
+					steps = append(steps, s)
+				}
+			}
+			job.Steps = steps
 			jobs = append(jobs, job)
 			expectKey = true
 		}
@@ -87,6 +94,8 @@ type Job struct {
 	Defaults       Defaults                  `yaml:"defaults,omitempty"`
 	Outputs        map[string]string         `yaml:"outputs,omitempty"`
 	Uses           string                    `yaml:"uses,omitempty"`
+	With           map[string]interface{}    `yaml:"with,omitempty"`
+	RawSecrets     yaml.Node                 `yaml:"secrets,omitempty"`
 }
 
 func (j *Job) Clone() *Job {
@@ -107,6 +116,8 @@ func (j *Job) Clone() *Job {
 		Defaults:       j.Defaults,
 		Outputs:        j.Outputs,
 		Uses:           j.Uses,
+		With:           j.With,
+		RawSecrets:     j.RawSecrets,
 	}
 }
 
@@ -139,6 +150,9 @@ type Step struct {
 
 // String gets the name of step
 func (s *Step) String() string {
+	if s == nil {
+		return ""
+	}
 	return (&model.Step{
 		ID:   s.ID,
 		Name: s.Name,
@@ -154,6 +168,7 @@ type ContainerSpec struct {
 	Volumes     []string          `yaml:"volumes,omitempty"`
 	Options     string            `yaml:"options,omitempty"`
 	Credentials map[string]string `yaml:"credentials,omitempty"`
+	Cmd         []string          `yaml:"cmd,omitempty"`
 }
 
 type Strategy struct {

pkg/jobparser/testdata/empty_step.in.yaml

@@ -0,0 +1,8 @@
+name: test
+jobs:
+  job1:
+    name: job1
+    runs-on: linux
+    steps:
+      - run: echo job-1
+      -

pkg/jobparser/testdata/empty_step.out.yaml

@@ -0,0 +1,7 @@
+name: test
+jobs:
+  job1:
+    name: job1
+    runs-on: linux
+    steps:
+      - run: echo job-1

pkg/jobparser/testdata/has_secrets.in.yaml

@@ -0,0 +1,14 @@
+name: test
+jobs:
+  job1:
+    name: job1
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    secrets:
+      secret: hideme
+
+  job2:
+    name: job2
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    secrets: inherit

pkg/jobparser/testdata/has_secrets.out.yaml

@@ -0,0 +1,16 @@
+name: test
+jobs:
+  job1:
+    name: job1
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    secrets:
+      secret: hideme
+---
+name: test
+jobs:
+  job2:
+    name: job2
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    secrets: inherit

pkg/jobparser/testdata/has_with.in.yaml

@@ -0,0 +1,15 @@
+name: test
+jobs:
+  job1:
+    name: job1
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    with:
+      package: service
+
+  job2:
+    name: job2
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    with:
+      package: module

pkg/jobparser/testdata/has_with.out.yaml

@@ -0,0 +1,17 @@
+name: test
+jobs:
+  job1:
+    name: job1
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    with:
+      package: service
+---
+name: test
+jobs:
+  job2:
+    name: job2
+    runs-on: linux
+    uses: .gitea/workflows/build.yml
+    with:
+      package: module

pkg/model/workflow.go

@@ -271,15 +271,13 @@ func (j *Job) Container() *ContainerSpec {
 	switch j.RawContainer.Kind {
 	case yaml.ScalarNode:
 		val = new(ContainerSpec)
-		err := j.RawContainer.Decode(&val.Image)
+		if !decodeNode(j.RawContainer, &val.Image) {
-		if err != nil {
+			return nil
-			log.Fatal(err)
 		}
 	case yaml.MappingNode:
 		val = new(ContainerSpec)
-		err := j.RawContainer.Decode(val)
+		if !decodeNode(j.RawContainer, val) {
-		if err != nil {
+			return nil
-			log.Fatal(err)
 		}
 	}
 	return val
@@ -290,16 +288,14 @@ func (j *Job) Needs() []string {
 	switch j.RawNeeds.Kind {
 	case yaml.ScalarNode:
 		var val string
-		err := j.RawNeeds.Decode(&val)
+		if !decodeNode(j.RawNeeds, &val) {
-		if err != nil {
+			return nil
-			log.Fatal(err)
 		}
 		return []string{val}
 	case yaml.SequenceNode:
 		var val []string
-		err := j.RawNeeds.Decode(&val)
+		if !decodeNode(j.RawNeeds, &val) {
-		if err != nil {
+			return nil
-			log.Fatal(err)
 		}
 		return val
 	}
@@ -311,16 +307,14 @@ func (j *Job) RunsOn() []string {
 	switch j.RawRunsOn.Kind {
 	case yaml.ScalarNode:
 		var val string
-		err := j.RawRunsOn.Decode(&val)
+		if !decodeNode(j.RawRunsOn, &val) {
-		if err != nil {
+			return nil
-			log.Fatal(err)
 		}
 		return []string{val}
 	case yaml.SequenceNode:
 		var val []string
-		err := j.RawRunsOn.Decode(&val)
+		if !decodeNode(j.RawRunsOn, &val) {
-		if err != nil {
+			return nil
-			log.Fatal(err)
 		}
 		return val
 	}
@@ -330,8 +324,8 @@ func (j *Job) RunsOn() []string {
 func environment(yml yaml.Node) map[string]string {
 	env := make(map[string]string)
 	if yml.Kind == yaml.MappingNode {
-		if err := yml.Decode(&env); err != nil {
+		if !decodeNode(yml, &env) {
-			log.Fatal(err)
+			return nil
 		}
 	}
 	return env
@@ -346,8 +340,8 @@ func (j *Job) Environment() map[string]string {
 func (j *Job) Matrix() map[string][]interface{} {
 	if j.Strategy.RawMatrix.Kind == yaml.MappingNode {
 		var val map[string][]interface{}
-		if err := j.Strategy.RawMatrix.Decode(&val); err != nil {
+		if !decodeNode(j.Strategy.RawMatrix, &val) {
-			log.Fatal(err)
+			return nil
 		}
 		return val
 	}
@@ -358,7 +352,7 @@ func (j *Job) Matrix() map[string][]interface{} {
 // It skips includes and hard fails excludes for non-existing keys
 //
 //nolint:gocyclo
-func (j *Job) GetMatrixes() []map[string]interface{} {
+func (j *Job) GetMatrixes() ([]map[string]interface{}, error) {
 	matrixes := make([]map[string]interface{}, 0)
 	if j.Strategy != nil {
 		j.Strategy.FailFast = j.Strategy.GetFailFast()
@@ -409,7 +403,7 @@ func (j *Job) GetMatrixes() []map[string]interface{} {
 						excludes = append(excludes, e)
 					} else {
 						// We fail completely here because that's what GitHub does for non-existing matrix keys, fail on exclude, silent skip on include
-						log.Fatalf("The workflow is not valid. Matrix exclude key '%s' does not match any key within the matrix", k)
+						return nil, fmt.Errorf("the workflow is not valid. Matrix exclude key %q does not match any key within the matrix", k)
 					}
 				}
 			}
@@ -454,7 +448,7 @@ func (j *Job) GetMatrixes() []map[string]interface{} {
 	} else {
 		matrixes = append(matrixes, make(map[string]interface{}))
 	}
-	return matrixes
+	return matrixes, nil
 }
 
 func commonKeysMatch(a map[string]interface{}, b map[string]interface{}) bool {
@@ -528,6 +522,9 @@ type ContainerSpec struct {
 	Args        string
 	Name        string
 	Reuse       bool
+
+	// Gitea specific
+	Cmd []string `yaml:"cmd"`
 }
 
 // Step is the structure of one step in a job
@@ -699,3 +696,17 @@ func (w *Workflow) GetJobIDs() []string {
 	}
 	return ids
 }
+
+var OnDecodeNodeError = func(node yaml.Node, out interface{}, err error) {
+	log.Fatalf("Failed to decode node %v into %T: %v", node, out, err)
+}
+
+func decodeNode(node yaml.Node, out interface{}) bool {
+	if err := node.Decode(out); err != nil {
+		if OnDecodeNodeError != nil {
+			OnDecodeNodeError(node, out, err)
+		}
+		return false
+	}
+	return true
+}

pkg/model/workflow_test.go

@@ -332,25 +332,33 @@ func TestReadWorkflow_Strategy(t *testing.T) {
 	wf := p.Stages[0].Runs[0].Workflow
 
 	job := wf.Jobs["strategy-only-max-parallel"]
-	assert.Equal(t, job.GetMatrixes(), []map[string]interface{}{{}})
+	matrixes, err := job.GetMatrixes()
+	assert.NoError(t, err)
+	assert.Equal(t, matrixes, []map[string]interface{}{{}})
 	assert.Equal(t, job.Matrix(), map[string][]interface{}(nil))
 	assert.Equal(t, job.Strategy.MaxParallel, 2)
 	assert.Equal(t, job.Strategy.FailFast, true)
 
 	job = wf.Jobs["strategy-only-fail-fast"]
-	assert.Equal(t, job.GetMatrixes(), []map[string]interface{}{{}})
+	matrixes, err = job.GetMatrixes()
+	assert.NoError(t, err)
+	assert.Equal(t, matrixes, []map[string]interface{}{{}})
 	assert.Equal(t, job.Matrix(), map[string][]interface{}(nil))
 	assert.Equal(t, job.Strategy.MaxParallel, 4)
 	assert.Equal(t, job.Strategy.FailFast, false)
 
 	job = wf.Jobs["strategy-no-matrix"]
-	assert.Equal(t, job.GetMatrixes(), []map[string]interface{}{{}})
+	matrixes, err = job.GetMatrixes()
+	assert.NoError(t, err)
+	assert.Equal(t, matrixes, []map[string]interface{}{{}})
 	assert.Equal(t, job.Matrix(), map[string][]interface{}(nil))
 	assert.Equal(t, job.Strategy.MaxParallel, 2)
 	assert.Equal(t, job.Strategy.FailFast, false)
 
 	job = wf.Jobs["strategy-all"]
-	assert.Equal(t, job.GetMatrixes(),
+	matrixes, err = job.GetMatrixes()
+	assert.NoError(t, err)
+	assert.Equal(t, matrixes,
 		[]map[string]interface{}{
 			{"datacenter": "site-c", "node-version": "14.x", "site": "staging"},
 			{"datacenter": "site-c", "node-version": "16.x", "site": "staging"},

pkg/runner/expression.go

@@ -81,6 +81,8 @@ func (rc *RunContext) NewExpressionEvaluatorWithEnv(ctx context.Context, env map
 		Matrix:   rc.Matrix,
 		Needs:    using,
 		Inputs:   inputs,
+
+		Vars: rc.getVarsContext(),
 	}
 	if rc.JobContainer != nil {
 		ee.Runner = rc.JobContainer.GetRunnerContext(ctx)
@@ -130,6 +132,8 @@ func (rc *RunContext) NewStepExpressionEvaluator(ctx context.Context, step step)
 		// todo: should be unavailable
 		// but required to interpolate/evaluate the inputs in actions/composite
 		Inputs: inputs,
+
+		Vars: rc.getVarsContext(),
 	}
 	if rc.JobContainer != nil {
 		ee.Runner = rc.JobContainer.GetRunnerContext(ctx)

pkg/runner/job_executor.go

@@ -70,7 +70,19 @@ func newJobExecutor(info jobInfo, sf stepFactory, rc *RunContext) common.Executo
 			return common.NewErrorExecutor(err)
 		}
 
-		preSteps = append(preSteps, useStepLogger(rc, stepModel, stepStagePre, step.pre()))
+		preExec := step.pre()
+		preSteps = append(preSteps, useStepLogger(rc, stepModel, stepStagePre, func(ctx context.Context) error {
+			logger := common.Logger(ctx)
+			preErr := preExec(ctx)
+			if preErr != nil {
+				logger.Errorf("%v", preErr)
+				common.SetJobError(ctx, preErr)
+			} else if ctx.Err() != nil {
+				logger.Errorf("%v", ctx.Err())
+				common.SetJobError(ctx, ctx.Err())
+			}
+			return preErr
+		}))
 
 		stepExec := step.main()
 		steps = append(steps, useStepLogger(rc, stepModel, stepStageMain, func(ctx context.Context) error {
@@ -102,7 +114,21 @@ func newJobExecutor(info jobInfo, sf stepFactory, rc *RunContext) common.Executo
 			// always allow 1 min for stopping and removing the runner, even if we were cancelled
 			ctx, cancel := context.WithTimeout(common.WithLogger(context.Background(), common.Logger(ctx)), time.Minute)
 			defer cancel()
+
+			logger := common.Logger(ctx)
+			logger.Infof("Cleaning up services for job %s", rc.JobName)
+			if err := rc.stopServiceContainers()(ctx); err != nil {
+				logger.Errorf("Error while cleaning services: %v", err)
+			}
+
+			logger.Infof("Cleaning up container for job %s", rc.JobName)
 			err = info.stopContainer()(ctx)
+
+			logger.Infof("Cleaning up network for job %s", rc.JobName)
+			networkName := fmt.Sprintf("%s-network", rc.jobContainerName())
+			if err := rc.removeNetwork(networkName)(ctx); err != nil {
+				logger.Errorf("Error while cleaning network: %v", err)
+			}
 		}
 		setJobResult(ctx, info, rc, jobError == nil)
 		setJobOutputs(ctx, rc)

pkg/runner/reusable_workflow.go

@@ -30,8 +30,11 @@ func newLocalReusableWorkflowExecutor(rc *RunContext) common.Executor {
 
 	workflowDir := fmt.Sprintf("%s/%s", rc.ActionCacheDir(), safeFilename(uses))
 
+	// If the repository is private, we need a token to clone it
+	token := rc.Config.GetToken()
+
 	return common.NewPipelineExecutor(
-		newMutexExecutor(cloneIfRequired(rc, *remoteReusableWorkflow, workflowDir)),
+		newMutexExecutor(cloneIfRequired(rc, *remoteReusableWorkflow, workflowDir, token)),
 		newReusableWorkflowExecutor(rc, workflowDir, remoteReusableWorkflow.FilePath()),
 	)
 }
@@ -47,8 +50,11 @@ func newRemoteReusableWorkflowExecutor(rc *RunContext) common.Executor {
 
 	workflowDir := fmt.Sprintf("%s/%s", rc.ActionCacheDir(), safeFilename(uses))
 
+	// FIXME: if the reusable workflow is from a private repository, we need to provide a token to access the repository.
+	token := ""
+
 	return common.NewPipelineExecutor(
-		newMutexExecutor(cloneIfRequired(rc, *remoteReusableWorkflow, workflowDir)),
+		newMutexExecutor(cloneIfRequired(rc, *remoteReusableWorkflow, workflowDir, token)),
 		newReusableWorkflowExecutor(rc, workflowDir, remoteReusableWorkflow.FilePath()),
 	)
 }
@@ -66,7 +72,7 @@ func newMutexExecutor(executor common.Executor) common.Executor {
 	}
 }
 
-func cloneIfRequired(rc *RunContext, remoteReusableWorkflow remoteReusableWorkflow, targetDirectory string) common.Executor {
+func cloneIfRequired(rc *RunContext, remoteReusableWorkflow remoteReusableWorkflow, targetDirectory, token string) common.Executor {
 	return common.NewConditionalExecutor(
 		func(ctx context.Context) bool {
 			_, err := os.Stat(targetDirectory)
@@ -77,7 +83,7 @@ func cloneIfRequired(rc *RunContext, remoteReusableWorkflow remoteReusableWorkfl
 			URL:   remoteReusableWorkflow.CloneURL(),
 			Ref:   remoteReusableWorkflow.Ref,
 			Dir:   targetDirectory,
-			Token: rc.Config.Token,
+			Token: token,
 		}),
 		nil,
 	)

pkg/runner/run_context.go

@@ -18,6 +18,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/docker/docker/errdefs"
 	"github.com/mitchellh/go-homedir"
 	"github.com/opencontainers/selinux/go-selinux"
 	log "github.com/sirupsen/logrus"
@@ -43,6 +44,7 @@ type RunContext struct {
 	IntraActionState    map[string]map[string]string
 	ExprEval            ExpressionEvaluator
 	JobContainer        container.ExecutionsEnvironment
+	ServiceContainers   []container.ExecutionsEnvironment
 	OutputMappings      map[MappableOutput]MappableOutput
 	JobName             string
 	ActionPath          string
@@ -242,6 +244,50 @@ func (rc *RunContext) startJobContainer() common.Executor {
 		ext := container.LinuxContainerEnvironmentExtensions{}
 		binds, mounts := rc.GetBindsAndMounts()
 
+		// add service containers
+		for name, spec := range rc.Run.Job().Services {
+			// interpolate env
+			interpolatedEnvs := make(map[string]string, len(spec.Env))
+			for k, v := range spec.Env {
+				interpolatedEnvs[k] = rc.ExprEval.Interpolate(ctx, v)
+			}
+			envs := make([]string, 0, len(interpolatedEnvs))
+			for k, v := range interpolatedEnvs {
+				envs = append(envs, fmt.Sprintf("%s=%s", k, v))
+			}
+			// interpolate cmd
+			interpolatedCmd := make([]string, 0, len(spec.Cmd))
+			for _, v := range spec.Cmd {
+				interpolatedCmd = append(interpolatedCmd, rc.ExprEval.Interpolate(ctx, v))
+			}
+			serviceContainerName := createSimpleContainerName(rc.jobContainerName(), name)
+			c := container.NewContainer(&container.NewContainerInput{
+				Name:       serviceContainerName,
+				WorkingDir: ext.ToContainerPath(rc.Config.Workdir),
+				Image:      spec.Image,
+				Username:   username,
+				Password:   password,
+				Cmd:        interpolatedCmd,
+				Env:        envs,
+				Mounts: map[string]string{
+					// TODO merge volumes
+					name:            ext.ToContainerPath(rc.Config.Workdir),
+					"act-toolcache": "/toolcache",
+					"act-actions":   "/actions",
+				},
+				Binds:          binds,
+				Stdout:         logWriter,
+				Stderr:         logWriter,
+				Privileged:     rc.Config.Privileged,
+				UsernsMode:     rc.Config.UsernsMode,
+				Platform:       rc.Config.ContainerArchitecture,
+				AutoRemove:     rc.Config.AutoRemove,
+				Options:        spec.Options,
+				NetworkAliases: []string{name},
+			})
+			rc.ServiceContainers = append(rc.ServiceContainers, c)
+		}
+
 		rc.cleanUpJobContainer = func(ctx context.Context) error {
 			if rc.JobContainer != nil && !rc.Config.ReuseContainers {
 				return rc.JobContainer.Remove().
@@ -275,11 +321,24 @@ func (rc *RunContext) startJobContainer() common.Executor {
 			return errors.New("Failed to create job container")
 		}
 
+		networkName := fmt.Sprintf("%s-network", rc.jobContainerName())
 		return common.NewPipelineExecutor(
+			rc.pullServicesImages(rc.Config.ForcePull),
 			rc.JobContainer.Pull(rc.Config.ForcePull),
+			rc.stopServiceContainers(),
 			rc.stopJobContainer(),
+			func(ctx context.Context) error {
+				err := rc.removeNetwork(networkName)(ctx)
+				if errdefs.IsNotFound(err) {
+					return nil
+				}
+				return err
+			},
+			rc.createNetwork(networkName),
+			rc.startServiceContainers(networkName),
 			rc.JobContainer.Create(rc.Config.ContainerCapAdd, rc.Config.ContainerCapDrop),
 			rc.JobContainer.Start(false),
+			rc.JobContainer.ConnectToNetwork(networkName),
 			rc.JobContainer.Copy(rc.JobContainer.GetActPath()+"/", &container.FileEntry{
 				Name: "workflow/event.json",
 				Mode: 0o644,
@@ -293,6 +352,18 @@ func (rc *RunContext) startJobContainer() common.Executor {
 	}
 }
 
+func (rc *RunContext) createNetwork(name string) common.Executor {
+	return func(ctx context.Context) error {
+		return container.NewDockerNetworkCreateExecutor(name)(ctx)
+	}
+}
+
+func (rc *RunContext) removeNetwork(name string) common.Executor {
+	return func(ctx context.Context) error {
+		return container.NewDockerNetworkRemoveExecutor(name)(ctx)
+	}
+}
+
 func (rc *RunContext) execJobContainer(cmd []string, env map[string]string, user, workdir string) common.Executor {
 	return func(ctx context.Context) error {
 		return rc.JobContainer.Exec(cmd, env, user, workdir)(ctx)
@@ -354,6 +425,41 @@ func (rc *RunContext) stopJobContainer() common.Executor {
 	}
 }
 
+func (rc *RunContext) pullServicesImages(forcePull bool) common.Executor {
+	return func(ctx context.Context) error {
+		execs := []common.Executor{}
+		for _, c := range rc.ServiceContainers {
+			execs = append(execs, c.Pull(forcePull))
+		}
+		return common.NewParallelExecutor(len(execs), execs...)(ctx)
+	}
+}
+
+func (rc *RunContext) startServiceContainers(networkName string) common.Executor {
+	return func(ctx context.Context) error {
+		execs := []common.Executor{}
+		for _, c := range rc.ServiceContainers {
+			execs = append(execs, common.NewPipelineExecutor(
+				c.Pull(false),
+				c.Create(rc.Config.ContainerCapAdd, rc.Config.ContainerCapDrop),
+				c.Start(false),
+				c.ConnectToNetwork(networkName),
+			))
+		}
+		return common.NewParallelExecutor(len(execs), execs...)(ctx)
+	}
+}
+
+func (rc *RunContext) stopServiceContainers() common.Executor {
+	return func(ctx context.Context) error {
+		execs := []common.Executor{}
+		for _, c := range rc.ServiceContainers {
+			execs = append(execs, c.Remove())
+		}
+		return common.NewParallelExecutor(len(execs), execs...)(ctx)
+	}
+}
+
 // Prepare the mounts and binds for the worker
 
 // ActionCacheDir is for rc
@@ -589,6 +695,10 @@ func (rc *RunContext) getStepsContext() map[string]*model.StepResult {
 	return rc.StepResults
 }
 
+func (rc *RunContext) getVarsContext() map[string]string {
+	return rc.Config.Vars
+}
+
 func (rc *RunContext) getGithubContext(ctx context.Context) *model.GithubContext {
 	logger := common.Logger(ctx)
 	ghc := &model.GithubContext{

pkg/runner/runner.go

@@ -7,11 +7,11 @@ import (
 	"os"
 	"time"
 
-	log "github.com/sirupsen/logrus"
-
 	"github.com/nektos/act/pkg/common"
 	"github.com/nektos/act/pkg/container"
 	"github.com/nektos/act/pkg/model"
+
+	log "github.com/sirupsen/logrus"
 )
 
 // Runner provides capabilities to run GitHub actions
@@ -64,6 +64,15 @@ type Config struct {
 	DefaultActionInstance string                       // the default actions web site
 	PlatformPicker        func(labels []string) string // platform picker, it will take precedence over Platforms if isn't nil
 	JobLoggerLevel        *log.Level                   // the level of job logger
+	Vars                  map[string]string            // the list of variables set at the repository, environment, or organization levels.
+}
+
+func (c Config) GetToken() string {
+	token := c.Secrets["GITHUB_TOKEN"]
+	if c.Secrets["GITEA_TOKEN"] != "" {
+		token = c.Secrets["GITEA_TOKEN"]
+	}
+	return token
 }
 
 type caller struct {
@@ -128,7 +137,11 @@ func (runner *runnerImpl) NewPlanExecutor(plan *model.Plan) common.Executor {
 						log.Errorf("Error while evaluating matrix: %v", err)
 					}
 				}
-				matrixes := job.GetMatrixes()
+				matrixes, err := job.GetMatrixes()
+				if err != nil {
+					log.Errorf("Error while get job's matrix: %v", err)
+					// fall back to empty matrixes
+				}
 				maxParallel := 4
 				if job.Strategy != nil {
 					maxParallel = job.Strategy.MaxParallel

pkg/runner/runner_test.go

@@ -546,6 +546,43 @@ func TestRunEventSecrets(t *testing.T) {
 	tjfi.runTest(context.Background(), t, &Config{Secrets: secrets, Env: env})
 }
 
+func TestRunWithService(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test")
+	}
+
+	log.SetLevel(log.DebugLevel)
+	ctx := context.Background()
+
+	platforms := map[string]string{
+		"ubuntu-latest": "node:12.20.1-buster-slim",
+	}
+
+	workflowPath := "services"
+	eventName := "push"
+
+	workdir, err := filepath.Abs("testdata")
+	assert.NoError(t, err, workflowPath)
+
+	runnerConfig := &Config{
+		Workdir:         workdir,
+		EventName:       eventName,
+		Platforms:       platforms,
+		ReuseContainers: false,
+	}
+	runner, err := New(runnerConfig)
+	assert.NoError(t, err, workflowPath)
+
+	planner, err := model.NewWorkflowPlanner(fmt.Sprintf("testdata/%s", workflowPath), true)
+	assert.NoError(t, err, workflowPath)
+
+	plan, err := planner.PlanEvent(eventName)
+	assert.NoError(t, err, workflowPath)
+
+	err = runner.NewPlanExecutor(plan)(ctx)
+	assert.NoError(t, err, workflowPath)
+}
+
 func TestRunActionInputs(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")

pkg/runner/testdata/services/push.yaml

@@ -0,0 +1,26 @@
+name: services
+on: push
+jobs:
+  services:
+    name: Reproduction of failing Services interpolation
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres:12
+        env:
+          POSTGRES_USER: runner
+          POSTGRES_PASSWORD: mysecretdbpass
+          POSTGRES_DB: mydb
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    steps:
+      - name: Echo the Postgres service ID / Network / Ports
+        run: |
+          echo "id: ${{ job.services.postgres.id }}"
+          echo "network: ${{ job.services.postgres.network }}"
+          echo "ports: ${{ job.services.postgres.ports }}"