support for container option: --hostname (#809)

pkg/container/docker_run.go

@@ -52,6 +52,7 @@ type NewContainerInput struct {
 	Privileged  bool
 	UsernsMode  string
 	Platform    string
+	Hostname    string
 }
 
 // FileEntry is a file to copy to a container
@@ -302,6 +303,7 @@ func (cr *containerReference) create(capAdd []string, capDrop []string) common.E
 			WorkingDir: input.WorkingDir,
 			Env:        input.Env,
 			Tty:        isTerminal,
+			Hostname:   input.Hostname,
 		}
 
 		mounts := make([]mount.Mount, 0)

pkg/runner/run_context.go

@@ -11,6 +11,9 @@ import (
 	"runtime"
 	"strings"
 
+	"github.com/google/shlex"
+	"github.com/spf13/pflag"
+
 	"github.com/mitchellh/go-homedir"
 	log "github.com/sirupsen/logrus"
 
@@ -96,6 +99,7 @@ func (rc *RunContext) GetBindsAndMounts() ([]string, map[string]string) {
 
 func (rc *RunContext) startJobContainer() common.Executor {
 	image := rc.platformImage()
+	hostname := rc.hostname()
 
 	return func(ctx context.Context) error {
 		rawLogger := common.Logger(ctx).WithField("raw_output", true)
@@ -136,6 +140,7 @@ func (rc *RunContext) startJobContainer() common.Executor {
 			Privileged:  rc.Config.Privileged,
 			UsernsMode:  rc.Config.UsernsMode,
 			Platform:    rc.Config.ContainerArchitecture,
+			Hostname:    hostname,
 		})
 
 		var copyWorkspace bool
@@ -304,6 +309,28 @@ func (rc *RunContext) platformImage() string {
 	return ""
 }
 
+func (rc *RunContext) hostname() string {
+	job := rc.Run.Job()
+	c := job.Container()
+	if c == nil {
+		return ""
+	}
+
+	optionsFlags := pflag.NewFlagSet("container_options", pflag.ContinueOnError)
+	hostname := optionsFlags.StringP("hostname", "h", "", "")
+	optionsArgs, err := shlex.Split(c.Options)
+	if err != nil {
+		log.Warnf("Cannot parse container options: %s", c.Options)
+		return ""
+	}
+	err = optionsFlags.Parse(optionsArgs)
+	if err != nil {
+		log.Warnf("Cannot parse container options: %s", c.Options)
+		return ""
+	}
+	return *hostname
+}
+
 func (rc *RunContext) isEnabled(ctx context.Context) bool {
 	job := rc.Run.Job()
 	l := common.Logger(ctx)

pkg/runner/runner_test.go

@@ -103,6 +103,7 @@ func TestRunEvent(t *testing.T) {
 		{"testdata", "shells/sh", "push", "", platforms, ""},
 		{"testdata", "job-container", "push", "", platforms, ""},
 		{"testdata", "job-container-non-root", "push", "", platforms, ""},
+		{"testdata", "container-hostname", "push", "", platforms, ""},
 		{"testdata", "uses-docker-url", "push", "", platforms, ""},
 		{"testdata", "remote-action-docker", "push", "", platforms, ""},
 		{"testdata", "remote-action-js", "push", "", platforms, ""},

pkg/runner/testdata/container-hostname/push.yml

@@ -0,0 +1,20 @@
+name: container-hostname
+on: push
+
+jobs:
+  with-hostname:
+    runs-on: ubuntu-latest
+    container:
+      image: node:12-buster-slim
+      options: "--hostname my.host.local"
+    steps:
+      - run: |
+          [[ $(uname -n) == "my.host.local" ]]
+
+  default-hostname:
+    runs-on: ubuntu-latest
+    container:
+      image: node:12-buster-slim
+    steps:
+      - run: |
+          [[ $(uname -n) ]] && [[ $(uname -n) != "my.host.local" ]]