dnf-json: Change dnf-json to be a daemon

The service is started via systemd activation sockets.
The service serves http POST requests, the same json as before is
expected as the body of the request, and the same json as before is sent
as the response of the request.

cmd/osbuild-composer/composer.go

@@ -66,7 +66,7 @@ func NewComposer(config *ComposerConfigFile, stateDir, cacheDir string) (*Compos
 	c.distros = distroregistry.NewDefault()
 	logrus.Infof("Loaded %d distros", len(c.distros.List()))
 
-	c.rpm = rpmmd.NewRPMMD(path.Join(c.cacheDir, "rpmmd"), "/usr/libexec/osbuild-composer/dnf-json")
+	c.rpm = rpmmd.NewRPMMD(path.Join(c.cacheDir, "rpmmd"))
 
 	var jobs jobqueue.JobQueue
 	if config.Worker.PGDatabase != "" {

cmd/osbuild-dnf-json-tests/main_test.go

@@ -5,8 +5,8 @@
 package main
 
 import (
-	"fmt"
 	"io/ioutil"
+	"net/http"
 	"os"
 	"path"
 	"testing"
@@ -23,6 +23,11 @@ import (
 
 func TestFetchChecksum(t *testing.T) {
 	dir, err := test.SetUpTemporaryRepository()
+	fs := http.FileServer(http.Dir(dir))
+	go func() {
+		err := http.ListenAndServe(":9000", fs)
+		assert.Nilf(t, err, "Could not start the http server: %v", err)
+	}()
 	defer func(dir string) {
 		err := test.TearDownTemporaryRepository(dir)
 		assert.Nil(t, err, "Failed to clean up temporary repository.")
@@ -31,13 +36,13 @@ func TestFetchChecksum(t *testing.T) {
 
 	repoCfg := rpmmd.RepoConfig{
 		Name:      "repo",
-		BaseURL:   fmt.Sprintf("file://%s", dir),
+		BaseURL:   "http://localhost:9000",
 		IgnoreSSL: true,
 	}
 
 	// use a fullpath to dnf-json, this allows this test to have an arbitrary
 	// working directory
-	rpmMetadata := rpmmd.NewRPMMD(path.Join(dir, "rpmmd"), "/usr/libexec/osbuild-composer/dnf-json")
+	rpmMetadata := rpmmd.NewRPMMD(path.Join(dir, "rpmmd"))
 	_, c, err := rpmMetadata.FetchMetadata([]rpmmd.RepoConfig{repoCfg}, "platform:f31", "x86_64", "31")
 	assert.Nilf(t, err, "Failed to fetch checksum: %v", err)
 	assert.NotEqual(t, "", c["repo"], "The checksum is empty")
@@ -64,7 +69,7 @@ func TestCrossArchDepsolve(t *testing.T) {
 
 			// use a fullpath to dnf-json, this allows this test to have an arbitrary
 			// working directory
-			rpm := rpmmd.NewRPMMD(dir, "/usr/libexec/osbuild-composer/dnf-json")
+			rpm := rpmmd.NewRPMMD(dir)
 
 			repos, err := rpmmd.LoadRepositories([]string{repoDir}, distroStruct.Name())
 			require.NoErrorf(t, err, "Failed to LoadRepositories %v", distroStruct.Name())

cmd/osbuild-pipeline/main.go

@@ -118,7 +118,7 @@ func main() {
 		panic("os.UserHomeDir(): " + err.Error())
 	}
 
-	rpm_md := rpmmd.NewRPMMD(path.Join(home, ".cache/osbuild-composer/rpmmd"), "/usr/libexec/osbuild-composer/dnf-json")
+	rpm_md := rpmmd.NewRPMMD(path.Join(home, ".cache/osbuild-composer/rpmmd"))
 
 	packageSpecSets := make(map[string][]rpmmd.PackageSpec)
 	for name, packages := range packageSets {

cmd/osbuild-store-dump/main.go

@@ -138,7 +138,7 @@ func main() {
 	if err != nil {
 		panic("os.UserHomeDir(): " + err.Error())
 	}
-	rpmmd := rpmmd.NewRPMMD(path.Join(homeDir, ".cache/osbuild-composer/rpmmd"), "/usr/libexec/osbuild-composer/dnf-json")
+	rpmmd := rpmmd.NewRPMMD(path.Join(homeDir, ".cache/osbuild-composer/rpmmd"))
 
 	s := store.New(&cwd, a, nil)
 	if s == nil {

cmd/osbuild-worker/jobimpl-depsolve.go

@@ -12,7 +12,7 @@ type DepsolveJobImpl struct {
 }
 
 func (impl *DepsolveJobImpl) depsolve(packageSets map[string]rpmmd.PackageSet, repos []rpmmd.RepoConfig, modulePlatformID, arch, releasever string) (map[string][]rpmmd.PackageSpec, error) {
-	rpmMD := rpmmd.NewRPMMD(impl.RPMMDCache, "/usr/libexec/osbuild-composer/dnf-json")
+	rpmMD := rpmmd.NewRPMMD(impl.RPMMDCache)
 
 	packageSpecs := make(map[string][]rpmmd.PackageSpec)
 	for name, packageSet := range packageSets {