worker: pass build environment to osbuild

Detect it from the host using the distro package.

internal/distro/distro.go

@@ -31,6 +31,9 @@ type Distro interface {
 	// output format with all packages and customizations specified in the
 	// given blueprint.
 	Pipeline(b *blueprint.Blueprint, outputFormat string) (*pipeline.Pipeline, error)
+
+	// Returns a osbuild runner that can be used on this distro.
+	Runner() string
 }
 
 var registered map[string]Distro

internal/distro/fedora30/distro.go

@@ -343,6 +343,10 @@ func (r *Fedora30) Pipeline(b *blueprint.Blueprint, outputFormat string) (*pipel
 	return p, nil
 }
 
+func (r *Fedora30) Runner() string {
+	return "org.osbuild.fedora30"
+}
+
 func (r *Fedora30) buildPipeline() *pipeline.Pipeline {
 	packages := []string{
 		"dnf",

internal/distro/rhel82/distro.go

@@ -373,6 +373,10 @@ func (r *RHEL82) Pipeline(b *blueprint.Blueprint, outputFormat string) (*pipelin
 	return p, nil
 }
 
+func (r *RHEL82) Runner() string {
+	return "org.osbuild.rhel82"
+}
+
 func (r *RHEL82) buildPipeline() *pipeline.Pipeline {
 	packages := []string{
 		"dnf",

internal/distro/test/distro.go

@@ -36,3 +36,7 @@ func (d *TestDistro) FilenameFromType(outputFormat string) (string, string, erro
 func (d *TestDistro) Pipeline(b *blueprint.Blueprint, outputFormat string) (*pipeline.Pipeline, error) {
 	return nil, errors.New("invalid output format: " + outputFormat)
 }
+
+func (d *TestDistro) Runner() string {
+	return "org.osbuild.test"
+}

internal/jobqueue/job.go

@@ -3,10 +3,12 @@ package jobqueue
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"os/exec"
 
 	"github.com/google/uuid"
+	"github.com/osbuild/osbuild-composer/internal/distro"
 	"github.com/osbuild/osbuild-composer/internal/pipeline"
 	"github.com/osbuild/osbuild-composer/internal/target"
 	"github.com/osbuild/osbuild-composer/internal/upload/awsupload"
@@ -22,8 +24,28 @@ type JobStatus struct {
 	Status string `json:"status"`
 }
 
-func (job *Job) Run() (error, []error) {
-	cmd := exec.Command("osbuild", "--store", "/var/cache/osbuild-composer/store", "--json", "-")
+func (job *Job) Run(d distro.Distro) (error, []error) {
+	build := pipeline.Build{
+		Runner: d.Runner(),
+	}
+
+	buildFile, err := ioutil.TempFile("", "osbuild-worker-build-env-*")
+	if err != nil {
+		return err, nil
+	}
+	defer os.Remove(buildFile.Name())
+
+	err = json.NewEncoder(buildFile).Encode(build)
+	if err != nil {
+		return err, nil
+	}
+
+	cmd := exec.Command(
+		"osbuild",
+		"--store", "/var/cache/osbuild-composer/store",
+		"--build-env", buildFile.Name(),
+		"--json", "-",
+	)
 	cmd.Stderr = os.Stderr
 
 	stdin, err := cmd.StdinPipe()