mkosi-initrd: honor x-initrd.attach options in crypttab

mkosi/initrd.py

@@ -169,6 +169,23 @@ def main() -> None:
 
         cmdline += ["--sandbox-tree", sandbox_tree]
 
+        # Generate crypttab with all the x-initrd.attach entries
+        if Path("/etc/crypttab").exists():
+            crypttab = [
+                line
+                for line in Path("/etc/crypttab").read_text().splitlines()
+                if (
+                    len(entry := line.split()) >= 4
+                    and not entry[0].startswith("#")
+                    and "x-initrd.attach" in entry[3]
+                )
+            ]
+            if crypttab:
+                with (Path(staging_dir) / "crypttab").open("w") as f:
+                    f.write("# Automatically generated by mkosi-initrd\n")
+                    f.write("\n".join(crypttab))
+                cmdline += ["--extra-tree", f"{staging_dir}/crypttab:/etc/crypttab"]
+
         # Prefer dnf as dnf5 has not yet officially replaced it and there's a much bigger chance that there
         # will be a populated dnf cache directory.
         run(