pipeline: fully encapsulate manifest generation

Make it the responsibility of each pipeline to track its required
sources, and use this to generate a manifest from its pipelines.

This removes the dependency on osbuild2 from distro.go, and the
only other uses of osbuild2 are to specify parameters in
ImageConfig, which will eventually go away too.

As a consequence, this only attaches the required sources for a
given manifest, rather than all known packages in the package set
map.

internal/manifest/iso_tree.go

@@ -0,0 +1,133 @@
+package manifest
+
+import (
+	"fmt"
+	"path"
+
+	"github.com/osbuild/osbuild-composer/internal/blueprint"
+	"github.com/osbuild/osbuild-composer/internal/distro"
+	"github.com/osbuild/osbuild-composer/internal/osbuild2"
+)
+
+// An ISOTreePipeline represents a tree containing the anaconda installer,
+// configuration in terms of a kickstart file, as well as an embedded
+// payload to be installed.
+type ISOTreePipeline struct {
+	BasePipeline
+	// TODO: review optional and mandatory fields and their meaning
+	UEFIVendor string
+	OSName     string
+	Release    string
+	Users      []blueprint.UserCustomization
+	Groups     []blueprint.GroupCustomization
+
+	anacondaPipeline *AnacondaPipeline
+	isoLabel         string
+	osTreeCommit     string
+	osTreeURL        string
+	osTreeRef        string
+}
+
+func NewISOTreePipeline(buildPipeline *BuildPipeline, anacondaPipeline *AnacondaPipeline, osTreeCommit, osTreeURL, osTreeRef, isoLabelTmpl string) ISOTreePipeline {
+	// TODO: replace isoLabelTmpl with more high-level properties
+	isoLabel := fmt.Sprintf(isoLabelTmpl, anacondaPipeline.Arch())
+
+	return ISOTreePipeline{
+		BasePipeline:     NewBasePipeline("bootiso-tree", buildPipeline, nil),
+		anacondaPipeline: anacondaPipeline,
+		isoLabel:         isoLabel,
+		osTreeCommit:     osTreeCommit,
+		osTreeURL:        osTreeURL,
+		osTreeRef:        osTreeRef,
+	}
+}
+
+func (p ISOTreePipeline) getOSTreeCommits() []osTreeCommit {
+	return []osTreeCommit{
+		{
+			checksum: p.osTreeCommit,
+			url:      p.osTreeURL,
+		},
+	}
+}
+
+func (p ISOTreePipeline) ISOLabel() string {
+	return p.isoLabel
+}
+
+func (p ISOTreePipeline) serialize() osbuild2.Pipeline {
+	pipeline := p.BasePipeline.serialize()
+
+	kspath := "/osbuild.ks"
+	ostreeRepoPath := "/ostree/repo"
+
+	pipeline.AddStage(osbuild2.NewBootISOMonoStage(bootISOMonoStageOptions(p.anacondaPipeline.KernelVer(), p.anacondaPipeline.Arch(), p.UEFIVendor, p.anacondaPipeline.Product(), p.anacondaPipeline.Version(), p.ISOLabel(), kspath), osbuild2.NewBootISOMonoStagePipelineTreeInputs(p.anacondaPipeline.Name())))
+
+	kickstartOptions, err := osbuild2.NewKickstartStageOptions(kspath, "", p.Users, p.Groups, makeISORootPath(ostreeRepoPath), p.osTreeRef, p.OSName)
+	if err != nil {
+		panic("password encryption failed")
+	}
+
+	pipeline.AddStage(osbuild2.NewKickstartStage(kickstartOptions))
+	pipeline.AddStage(osbuild2.NewDiscinfoStage(&osbuild2.DiscinfoStageOptions{
+		BaseArch: p.anacondaPipeline.Arch(),
+		Release:  p.Release,
+	}))
+
+	pipeline.AddStage(osbuild2.NewOSTreeInitStage(&osbuild2.OSTreeInitStageOptions{Path: ostreeRepoPath}))
+	pipeline.AddStage(osbuild2.NewOSTreePullStage(
+		&osbuild2.OSTreePullStageOptions{Repo: ostreeRepoPath},
+		osbuild2.NewOstreePullStageInputs("org.osbuild.source", p.osTreeCommit, p.osTreeRef),
+	))
+
+	return pipeline
+}
+
+func bootISOMonoStageOptions(kernelVer, arch, vendor, product, osVersion, isolabel, kspath string) *osbuild2.BootISOMonoStageOptions {
+	comprOptions := new(osbuild2.FSCompressionOptions)
+	if bcj := osbuild2.BCJOption(arch); bcj != "" {
+		comprOptions.BCJ = bcj
+	}
+	var architectures []string
+
+	if arch == distro.X86_64ArchName {
+		architectures = []string{"X64"}
+	} else if arch == distro.Aarch64ArchName {
+		architectures = []string{"AA64"}
+	} else {
+		panic("unsupported architecture")
+	}
+
+	return &osbuild2.BootISOMonoStageOptions{
+		Product: osbuild2.Product{
+			Name:    product,
+			Version: osVersion,
+		},
+		ISOLabel:   isolabel,
+		Kernel:     kernelVer,
+		KernelOpts: fmt.Sprintf("inst.ks=hd:LABEL=%s:%s", isolabel, kspath),
+		EFI: osbuild2.EFI{
+			Architectures: architectures,
+			Vendor:        vendor,
+		},
+		ISOLinux: osbuild2.ISOLinux{
+			Enabled: arch == distro.X86_64ArchName,
+			Debug:   false,
+		},
+		Templates: "99-generic",
+		RootFS: osbuild2.RootFS{
+			Size: 9216,
+			Compression: osbuild2.FSCompression{
+				Method:  "xz",
+				Options: comprOptions,
+			},
+		},
+	}
+}
+
+//makeISORootPath return a path that can be used to address files and folders in
+//the root of the iso
+func makeISORootPath(p string) string {
+	fullpath := path.Join("/run/install/repo", p)
+	return fmt.Sprintf("file://%s", fullpath)
+}