stages: add org.osbuild.xorrisofs

Add a new stage that uses the `xorrisofs`(1) command line utility
to assemble a. The iso can be made bootable by specifying a
combination of the `boot` and `efi` options.

stages/org.osbuild.xorrisofs

@@ -0,0 +1,150 @@
+#!/usr/bin/python3
+"""
+Assemble a Rock Ridge enhanced ISO 9660 filesystem (iso)
+
+Uses the `xorrisofs`(1) command line utility to assemble a
+Assemble a Rock Ridge enhanced ISO 9660 filesystem (iso).
+
+The iso can be made bootable by specifying a combination of
+`boot` and `efi`. What exact options make sense depend on
+the target platform.
+
+The `isolevel` options controls the limits of data size and
+filenames: if the iso should contain a  file, like a rootfs
+image, that is bigger than 4GB, at least iso level 3 is
+required.
+"""
+
+import os
+import subprocess
+import sys
+
+import osbuild.api
+
+
+SCHEMA_2 = r"""
+"options": {
+  "additionalProperties": false,
+  "required": ["filename", "volid"],
+  "properties": {
+    "filename": {
+      "type": "string",
+      "description": "Filename of the iso to create"
+    },
+    "volid": {
+      "type": "string",
+      "description": "Volume id to set",
+      "pattern": "[A-Z0-9_-]{1,32}"
+    },
+    "boot": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["image", "catalog"],
+      "properties": {
+        "image": {
+          "type": "string",
+          "description": "Path to the boot image (on the iso)"
+        },
+        "catalog": {
+          "type": "string",
+          "description": "Path to the boot catalog file (on the iso)"
+        }
+      }
+    },
+    "efi": {
+      "type": "string"
+    },
+    "isohybridmbr": {
+      "type": "string",
+      "description": "Install the argument (buildroot) as ISOLINUX isohybrid MBR"
+    },
+    "isolevel": {
+      "type": "integer",
+      "description": "The ISO 9660 version (limits of data size and filenames)",
+      "minimum": 1,
+      "maximum": 4
+    }
+  }
+},
+"inputs": {
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["tree"],
+  "properties": {
+    "tree": {
+      "type": "object",
+      "additionalProperties": true
+    }
+  }
+}
+"""
+
+
+def main(inputs, output_dir, options):
+    tree = inputs["tree"]["path"]
+    boot = options.get("boot", {})
+    filename = options["filename"]
+    vol_id = options["volid"]
+    efi = options.get("efi")
+    isohybrid = options.get("isohybridmbr")
+    isolevel = options.get("isolevel")
+
+    cmd = [
+        "/usr/bin/xorrisofs",
+        "-verbose"
+    ]
+
+    if isolevel:
+        cmd += [
+            "-iso-level", str(isolevel)
+        ]
+
+    cmd += [
+        "-V", vol_id,
+    ]
+
+    if isohybrid:
+        cmd += [
+            "-isohybrid-mbr", isohybrid,
+        ]
+
+    if boot:
+        image = boot["image"]
+        catalog = boot["catalog"]
+        cmd += [
+            "-b", image,
+            "-c", catalog,
+            "-boot-load-size", "4",
+            "-boot-info-table",
+            "-no-emul-boot"
+        ]
+
+    cmd += [
+        "-rock", "-joliet"
+    ]
+
+    if efi:
+        cmd += [
+            "-eltorito-alt-boot",
+            "-e", efi,
+            "-no-emul-boot"
+        ]
+
+        if isohybrid:
+            cmd += ["-isohybrid-gpt-basdat"]
+
+    cmd += [
+        '-o', os.path.join(output_dir, filename),
+        tree
+    ]
+
+    print(cmd)
+    subprocess.run(cmd, check=True)
+
+
+if __name__ == '__main__':
+    args = osbuild.api.arguments()
+    ret = main(args["inputs"],
+               args["tree"],
+               args["options"])
+    sys.exit(ret)