bib: extract new partition table helpers and add new DiskCustomization

This commit makes use of the excellent work in
osbuild/images#1041 and wires up support
to generate LVM and btrfs volumes via the new disk customizations.

It also add tests.

bib/cmd/bootc-image-builder/image.go

@@ -202,6 +202,44 @@ func setFSTypes(pt *disk.PartitionTable, rootfs string) error {
 }
 
 func genPartitionTable(c *ManifestConfig, customizations *blueprint.Customizations, rng *rand.Rand) (*disk.PartitionTable, error) {
+	fsCust := customizations.GetFilesystems()
+	diskCust, err := customizations.GetPartitioning()
+	if err != nil {
+		return nil, fmt.Errorf("error reading disk customizations: %w", err)
+	}
+	switch {
+	// XXX: move into images library
+	case fsCust != nil && diskCust != nil:
+		return nil, fmt.Errorf("cannot combine disk and filesystem customizations")
+	case diskCust != nil:
+		return genPartitionTableDiskCust(c, diskCust, rng)
+	default:
+		return genPartitionTableFsCust(c, fsCust, rng)
+	}
+}
+
+func genPartitionTableDiskCust(c *ManifestConfig, diskCust *blueprint.DiskCustomization, rng *rand.Rand) (*disk.PartitionTable, error) {
+	diskCust.MinSize = max(diskCust.MinSize, c.RootfsMinsize)
+
+	basept, ok := partitionTables[c.Architecture.String()]
+	if !ok {
+		return nil, fmt.Errorf("pipelines: no partition tables defined for %s", c.Architecture)
+	}
+	defaultFSType, err := disk.NewFSType(c.RootFSType)
+	if err != nil {
+		return nil, err
+	}
+
+	partOptions := &disk.CustomPartitionTableOptions{
+		PartitionTableType: basept.Type,
+		// XXX: not setting/defaults will fail to boot with btrfs/lvm
+		BootMode:      platform.BOOT_HYBRID,
+		DefaultFSType: defaultFSType,
+	}
+	return disk.NewCustomPartitionTable(diskCust, partOptions, rng)
+}
+
+func genPartitionTableFsCust(c *ManifestConfig, fsCust []blueprint.FilesystemCustomization, rng *rand.Rand) (*disk.PartitionTable, error) {
 	basept, ok := partitionTables[c.Architecture.String()]
 	if !ok {
 		return nil, fmt.Errorf("pipelines: no partition tables defined for %s", c.Architecture)
@@ -211,10 +249,10 @@ func genPartitionTable(c *ManifestConfig, customizations *blueprint.Customizatio
 	if c.RootFSType == "btrfs" {
 		partitioningMode = disk.BtrfsPartitioningMode
 	}
-	if err := checkFilesystemCustomizations(customizations.GetFilesystems(), partitioningMode); err != nil {
+	if err := checkFilesystemCustomizations(fsCust, partitioningMode); err != nil {
 		return nil, err
 	}
-	fsCustomizations := updateFilesystemSizes(customizations.GetFilesystems(), c.RootfsMinsize)
+	fsCustomizations := updateFilesystemSizes(fsCust, c.RootfsMinsize)
 
 	pt, err := disk.NewPartitionTable(&basept, fsCustomizations, DEFAULT_SIZE, partitioningMode, nil, rng)
 	if err != nil {

package-requires.txt

@@ -2,7 +2,7 @@
 # from the Containerfile by default, using leading '#' as comments.
 
 # This project uses osbuild
-osbuild osbuild-ostree osbuild-depsolve-dnf
+osbuild osbuild-ostree osbuild-depsolve-dnf osbuild-lvm2
 
 # We mount container images internally
 podman

test/test_manifest.py

@@ -550,3 +550,84 @@ def test_manifest_fips_customization(tmp_path, build_container):
     ], text=True)
     st = find_grub2_iso_stage_from(output)
     assert "fips=1" in st["options"]["kernel"]["opts"]
+
+
+
+def find_bootc_install_to_fs_stage_from(manifest_str):
+    manifest = json.loads(manifest_str)
+    for pipeline in manifest["pipelines"]:
+        # the fstab stage in cross-arch manifests is in the "ostree-deployment" pipeline
+        if pipeline["name"] == "image":
+            for st in pipeline["stages"]:
+                if st["type"] == "org.osbuild.bootc.install-to-filesystem":
+                    return st
+    raise ValueError(f"cannot find bootc.install-to-filesystem stage in manifest:\n{manifest_str}")
+
+
+def test_manifest_disk_customization_lvm(tmp_path, build_container):
+    container_ref = "quay.io/centos-bootc/centos-bootc:stream9"
+
+    config = {
+        "customizations": {
+            "disk": {
+                "partitions": [
+                    {
+                        "type": "lvm",
+                        "logical_volumes": [
+                            {
+                                "fs_type": "ext4",
+                                "mountpoint": "/",
+                            }
+                        ]
+                    }
+                ]
+            }
+        }
+    }
+    config_path = tmp_path / "config.json"
+    with config_path.open("w") as config_file:
+        json.dump(config, config_file)
+
+    output = subprocess.check_output([
+        *testutil.podman_run_common,
+        "-v", f"{config_path}:/config.json:ro",
+        build_container,
+        "manifest", f"{container_ref}",
+    ])
+    st = find_bootc_install_to_fs_stage_from(output)
+    assert st["devices"]["rootlv"]["type"] == "org.osbuild.lvm2.lv"
+
+
+def test_manifest_disk_customization_btrfs(tmp_path, build_container):
+    container_ref = "quay.io/centos-bootc/centos-bootc:stream9"
+
+    config = {
+        "customizations": {
+            "disk": {
+                "partitions": [
+                    {
+                        "type": "btrfs",
+                        "subvolumes": [
+                            {
+                                "name": "root",
+                                "mountpoint": "/",
+                            }
+                        ]
+                    }
+                ]
+            }
+        }
+    }
+    config_path = tmp_path / "config.json"
+    with config_path.open("w") as config_file:
+        json.dump(config, config_file)
+
+    output = subprocess.check_output([
+        *testutil.podman_run_common,
+        "-v", f"{config_path}:/config.json:ro",
+        build_container,
+        "manifest", f"{container_ref}",
+    ])
+    st = find_bootc_install_to_fs_stage_from(output)
+    assert st["mounts"][0]["type"] == "org.osbuild.btrfs"
+    assert st["mounts"][0]["target"] == "/"

test/testcases.py

@@ -25,6 +25,8 @@ class TestCase:
     rootfs: str = ""
     # Sign the container_ref and use the new signed image instead of the original one
     sign: bool = False
+    # use special partition_mode like "lvm"
+    partition_mode: str = ""
 
     def bib_rootfs_args(self):
         if self.rootfs:
@@ -82,11 +84,17 @@ def gen_testcases(what):  # pylint: disable=too-many-return-statements
             TestCaseCentos(image="anaconda-iso"),
         ]
     if what == "qemu-boot":
+        # test partition defaults with qcow2
         test_cases = [
-            klass(image=img)
+            klass(image="qcow2")
             for klass in (TestCaseCentos, TestCaseFedora)
-            for img in ("raw", "qcow2")
         ]
+        # and custom with raw (this is arbitrary, we could do it the
+        # other way around too
+        test_cases.append(
+            TestCaseCentos(image="raw", partition_mode="lvm"))
+        test_cases.append(
+            TestCaseFedora(image="raw", partition_mode="btrfs"))
         # do a cross arch test too
         if platform.machine() == "x86_64":
             # TODO: re-enable once