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

mkosi/initrd.py

@@ -169,6 +169,20 @@ def main() -> None:
 
         cmdline += ["--sandbox-tree", sandbox_tree]
 
+        # Generate crypttab with all the x-initrd.attach entries
+        if Path("/etc/crypttab").exists():
+            crypttab = []
+            for line in Path("/etc/crypttab").read_text().splitlines():
+                entry = line.split()
+                if len(entry) < 4 or entry[0].startswith("#") or "x-initrd.attach" not in entry[3]:
+                    continue
+                crypttab.append(line)
+            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(