| #!/usr/bin/env python |
| """Generate an initial RAM disk for the hypervisor. |
| |
| Packages the VMs, initrds for the VMs and the list of secondary VMs (vms.txt) |
| into an initial RAM disk image. |
| """ |
| |
| import argparse |
| import os |
| import shutil |
| import subprocess |
| import sys |
| |
| |
| def Main(): |
| parser = argparse.ArgumentParser() |
| parser.add_argument("--primary_vm", required=True) |
| parser.add_argument("--primary_vm_initrd") |
| parser.add_argument( |
| "--secondary_vm", |
| action="append", |
| nargs=4, |
| metavar=("MEMORY", "CORES", "NAME", "IMAGE")) |
| parser.add_argument("--staging", required=True) |
| parser.add_argument("--output", required=True) |
| args = parser.parse_args() |
| # Prepare the primary VM image. |
| staged_files = ["vmlinuz"] |
| shutil.copyfile(args.primary_vm, os.path.join(args.staging, "vmlinuz")) |
| # Prepare the primary VM's initrd. Currently, it just makes an empty one. |
| if args.primary_vm_initrd: |
| raise NotImplementedError( |
| "This doesn't copy the primary VM's initrd yet") |
| with open(os.path.join(args.staging, "initrd.img"), "w") as vms_txt: |
| staged_files.append("initrd.img") |
| # Prepare the secondary VMs. |
| with open(os.path.join(args.staging, "vms.txt"), "w") as vms_txt: |
| staged_files.append("vms.txt") |
| if args.secondary_vm: |
| for vm in args.secondary_vm: |
| (vm_memory, vm_cores, vm_name, vm_image) = vm |
| staged_files.append(vm_name) |
| shutil.copy(vm_image, os.path.join(args.staging, vm_name)) |
| vms_txt.write("{} {} {}\n".format(vm_memory, vm_cores, vm_name)) |
| # Package files into an initial RAM disk. |
| with open(args.output, "w") as initrd: |
| # Move into the staging directory so the file names taken by cpio don't |
| # include the path. |
| os.chdir(args.staging) |
| cpio = subprocess.Popen( |
| ["cpio", "--create"], |
| stdin=subprocess.PIPE, |
| stdout=initrd, |
| stderr=subprocess.PIPE) |
| cpio.communicate(input="\n".join(staged_files).encode("utf-8")) |
| return 0 |
| |
| |
| if __name__ == "__main__": |
| sys.exit(Main()) |