manifestgen: add support for repos override

This commit adds support to override the manifest generator with
user-specified repositories. This is useful for e.g. the `cmd/build`
command that has the ability to override the repostiory information
via an arbitrary file.

pkg/manifestgen/manifestgen.go

@@ -48,6 +48,10 @@ type Options struct {
 	// useful for testing
 	CustomSeed *int64
 
+	// OverrideRepos overrides the default repository selection.
+	// This is mostly useful for testing
+	OverrideRepos []rpmmd.RepoConfig
+
 	// Custom "solver" functions, if unset the defaults will be
 	// used. Only needed for specialized use-cases.
 	Depsolver         DepsolveFunc
@@ -70,7 +74,8 @@ type Generator struct {
 
 	rpmDownloader osbuild.RpmDownloader
 
-	customSeed *int64
+	customSeed    *int64
+	overrideRepos []rpmmd.RepoConfig
 }
 
 // New will create a new manifest generator
@@ -89,6 +94,7 @@ func New(reporegistry *reporegistry.RepoRegistry, opts *Options) (*Generator, er
 		rpmDownloader:     opts.RpmDownloader,
 		sbomWriter:        opts.SBOMWriter,
 		customSeed:        opts.CustomSeed,
+		overrideRepos:     opts.OverrideRepos,
 	}
 	if mg.out == nil {
 		mg.out = os.Stdout
@@ -108,14 +114,19 @@ func New(reporegistry *reporegistry.RepoRegistry, opts *Options) (*Generator, er
 
 // Generate will generate a new manifest for the given distro/imageType/arch
 // combination.
-func (mg *Generator) Generate(bp *blueprint.Blueprint, dist distro.Distro, imgType distro.ImageType, a distro.Arch, imgOpts *distro.ImageOptions) error {
+func (mg *Generator) Generate(bp *blueprint.Blueprint, dist distro.Distro, imgType distro.ImageType, a distro.Arch, imgOpts *distro.ImageOptions) (err error) {
 	if imgOpts == nil {
 		imgOpts = &distro.ImageOptions{}
 	}
 
-	repos, err := mg.reporegistry.ReposByImageTypeName(dist.Name(), a.Name(), imgType.Name())
-	if err != nil {
-		return err
+	var repos []rpmmd.RepoConfig
+	if mg.overrideRepos != nil {
+		repos = mg.overrideRepos
+	} else {
+		repos, err = mg.reporegistry.ReposByImageTypeName(dist.Name(), a.Name(), imgType.Name())
+		if err != nil {
+			return err
+		}
 	}
 	// To support "user" a.k.a. "3rd party" repositories, these
 	// will have to be added to the repos with

pkg/manifestgen/manifestgen_test.go

@@ -144,10 +144,11 @@ func fakeDepsolve(cacheDir string, packageSets map[string][]rpmmd.PackageSet, d
 		for _, pkgSet := range pkgSets {
 			for _, pkgName := range pkgSet.Include {
 				resolvedSet.Packages = append(resolvedSet.Packages, rpmmd.PackageSpec{
-					Name:     pkgName,
-					Checksum: sha256For(pkgName),
-					Path:     fmt.Sprintf("path/%s.rpm", pkgName),
-					RepoID:   repoId,
+					Name:           pkgName,
+					Checksum:       sha256For(pkgName),
+					Path:           fmt.Sprintf("path/%s.rpm", pkgName),
+					RepoID:         repoId,
+					RemoteLocation: fmt.Sprintf("%s/%s.rpm", pkgSet.Repositories[0].BaseURLs[0], pkgName),
 				})
 				resolvedSet.Repos = append(resolvedSet.Repos, rpmmd.RepoConfig{
 					Id:       repoId,
@@ -330,3 +331,45 @@ func TestManifestGeneratorSeed(t *testing.T) {
 		}
 	}
 }
+
+func TestManifestGeneratorOverrideRepos(t *testing.T) {
+	repos, err := testrepos.New()
+	assert.NoError(t, err)
+	fac := distrofactory.NewDefault()
+
+	filter, err := imagefilter.New(fac, repos)
+	assert.NoError(t, err)
+	res, err := filter.Filter("distro:centos-9", "type:qcow2", "arch:x86_64")
+	assert.NoError(t, err)
+	assert.Equal(t, 1, len(res))
+
+	for _, withOverrideRepos := range []bool{false, true} {
+		t.Run(fmt.Sprintf("withOverrideRepos: %v", withOverrideRepos), func(t *testing.T) {
+			var osbuildManifest bytes.Buffer
+			opts := &manifestgen.Options{
+				Output:    &osbuildManifest,
+				Depsolver: fakeDepsolve,
+			}
+			if withOverrideRepos {
+				opts.OverrideRepos = []rpmmd.RepoConfig{
+					{
+						Name:     "overriden_repo",
+						BaseURLs: []string{"http://example.com/overriden-repo"},
+					},
+				}
+			}
+
+			mg, err := manifestgen.New(repos, opts)
+			assert.NoError(t, err)
+
+			var bp blueprint.Blueprint
+			err = mg.Generate(&bp, res[0].Distro, res[0].ImgType, res[0].Arch, nil)
+			assert.NoError(t, err)
+			if withOverrideRepos {
+				assert.Contains(t, osbuildManifest.String(), "http://example.com/overriden-repo/kernel.rpm")
+			} else {
+				assert.NotContains(t, osbuildManifest.String(), "http://example.com/overriden-repo/kernel.rpm")
+			}
+		})
+	}
+}