manifest: support specifying squashfs compression for ISOs

Add support for specifying the squashfs compression method for ISOTree
pipelines from the caller.
Build Fedora ISOs with lz4 compression and RHEL with xz.

internal/distro/fedora/images.go

@@ -224,6 +224,8 @@ func imageInstallerImage(workload workload.Workload,
 	img.Users = users.UsersFromBP(customizations.GetUsers())
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
+	img.SquashfsCompression = "lz4"
+
 	d := t.arch.distro
 
 	img.ISOLabelTempl = d.isolabelTmpl
@@ -323,6 +325,8 @@ func iotInstallerImage(workload workload.Workload,
 	img.Users = users.UsersFromBP(customizations.GetUsers())
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
+	img.SquashfsCompression = "lz4"
+
 	img.ISOLabelTempl = d.isolabelTmpl
 	img.Product = d.product
 	img.Variant = "IoT"

internal/distro/rhel9/images.go

@@ -270,6 +270,8 @@ func edgeInstallerImage(workload workload.Workload,
 	img.Users = users.UsersFromBP(customizations.GetUsers())
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
+	img.SquashfsCompression = "xz"
+
 	img.ISOLabelTempl = d.isolabelTmpl
 	img.Product = d.product
 	img.Variant = "edge"
@@ -342,6 +344,8 @@ func imageInstallerImage(workload workload.Workload,
 	img.Users = users.UsersFromBP(customizations.GetUsers())
 	img.Groups = users.GroupsFromBP(customizations.GetGroups())
 
+	img.SquashfsCompression = "xz"
+
 	d := t.arch.distro
 
 	img.ISOLabelTempl = d.isolabelTmpl

internal/image/image_installer.go

@@ -27,6 +27,8 @@ type ImageInstaller struct {
 	Users             []users.User
 	Groups            []users.Group
 
+	SquashfsCompression string
+
 	ISOLabelTempl string
 	Product       string
 	Variant       string
@@ -120,6 +122,8 @@ func (img *ImageInstaller) InstantiateManifest(m *manifest.Manifest,
 	isoTreePipeline.Users = img.Users
 	isoTreePipeline.Groups = img.Groups
 
+	isoTreePipeline.SquashfsCompression = img.SquashfsCompression
+
 	isoTreePipeline.OSPipeline = osPipeline
 	isoTreePipeline.KernelOpts = img.AdditionalKernelOpts
 

internal/image/ostree_installer.go

@@ -22,6 +22,8 @@ type OSTreeInstaller struct {
 	Users             []users.User
 	Groups            []users.Group
 
+	SquashfsCompression string
+
 	ISOLabelTempl string
 	Product       string
 	Variant       string
@@ -101,6 +103,9 @@ func (img *OSTreeInstaller) InstantiateManifest(m *manifest.Manifest,
 	isoTreePipeline.OSName = img.OSName
 	isoTreePipeline.Users = img.Users
 	isoTreePipeline.Groups = img.Groups
+
+	isoTreePipeline.SquashfsCompression = img.SquashfsCompression
+
 	isoTreePipeline.KSPath = "/ostree.ks"
 
 	isoTreePipeline.OSTree = &img.Commit

internal/manifest/iso_tree.go

@@ -32,6 +32,8 @@ type ISOTree struct {
 	KSPath   string
 	isoLabel string
 
+	SquashfsCompression string
+
 	OSPipeline *OS
 	OSTree     *ostree.CommitSpec
 
@@ -143,10 +145,21 @@ func (p *ISOTree) serialize() osbuild.Pipeline {
 
 	squashfsOptions := osbuild.SquashfsStageOptions{
 		Filename: "images/install.img",
-		Compression: osbuild.FSCompression{
-			Method: "lz4",
-		},
 	}
+
+	if p.SquashfsCompression != "" {
+		squashfsOptions.Compression.Method = p.SquashfsCompression
+	} else {
+		// default to xz if not specified
+		squashfsOptions.Compression.Method = "xz"
+	}
+
+	if squashfsOptions.Compression.Method == "xz" {
+		squashfsOptions.Compression.Options = &osbuild.FSCompressionOptions{
+			BCJ: osbuild.BCJOption(p.anacondaPipeline.platform.GetArch().String()),
+		}
+	}
+
 	squashfsStage := osbuild.NewSquashfsStage(&squashfsOptions, p.rootfsPipeline.Name())
 	pipeline.AddStage(squashfsStage)