216 lines
7.6 KiB
Python
Executable file
216 lines
7.6 KiB
Python
Executable file
#! /usr/bin/env python
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import os
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import sys
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import time
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import argparse
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import nixops.util
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from nixops import deployment
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from boto.ec2.blockdevicemapping import BlockDeviceMapping, BlockDeviceType
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import boto.ec2
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from nixops.statefile import StateFile, get_default_state_file
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parser = argparse.ArgumentParser(description='Create an EBS-backed NixOS AMI')
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parser.add_argument('--region', dest='region', required=True, help='EC2 region to create the image in')
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parser.add_argument('--channel', dest='channel', default="14.12", help='Channel to use')
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parser.add_argument('--keep', dest='keep', action='store_true', help='Keep NixOps machine after use')
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parser.add_argument('--hvm', dest='hvm', action='store_true', help='Create HVM image')
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parser.add_argument('--key', dest='key_name', action='store_true', help='Keypair used for HVM instance creation', default="rob")
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args = parser.parse_args()
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instance_type = "m3.medium" if args.hvm else "m1.small"
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if args.hvm:
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virtualization_type = "hvm"
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root_block = "/dev/sda1"
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image_type = 'hvm'
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else:
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virtualization_type = "paravirtual"
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root_block = "/dev/sda"
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image_type = 'ebs'
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ebs_size = 20
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# Start a NixOS machine in the given region.
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f = open("ebs-creator-config.nix", "w")
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f.write('''{{
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resources.ec2KeyPairs.keypair.accessKeyId = "lb-nixos";
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resources.ec2KeyPairs.keypair.region = "{0}";
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machine =
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{{ pkgs, ... }}:
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{{
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deployment.ec2.accessKeyId = "lb-nixos";
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deployment.ec2.region = "{0}";
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deployment.ec2.blockDeviceMapping."/dev/xvdg".size = pkgs.lib.mkOverride 10 {1};
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}};
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}}
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'''.format(args.region, ebs_size))
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f.close()
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db = StateFile(get_default_state_file())
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try:
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depl = db.open_deployment("ebs-creator")
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except Exception:
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depl = db.create_deployment()
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depl.name = "ebs-creator"
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depl.logger.set_autoresponse("y")
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depl.nix_exprs = [os.path.abspath("./ebs-creator.nix"), os.path.abspath("./ebs-creator-config.nix")]
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if not args.keep: depl.destroy_resources()
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depl.deploy(allow_reboot=True)
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m = depl.machines['machine']
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# Do the installation.
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device="/dev/xvdg"
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if args.hvm:
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m.run_command('parted -s /dev/xvdg -- mklabel msdos')
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m.run_command('parted -s /dev/xvdg -- mkpart primary ext2 1M -1s')
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device="/dev/xvdg1"
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m.run_command("if mountpoint -q /mnt; then umount /mnt; fi")
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m.run_command("mkfs.ext4 -L nixos {0}".format(device))
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m.run_command("mkdir -p /mnt")
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m.run_command("mount {0} /mnt".format(device))
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m.run_command("touch /mnt/.ebs")
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m.run_command("mkdir -p /mnt/etc/nixos")
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m.run_command("nix-channel --add https://nixos.org/channels/nixos-{} nixos".format(args.channel))
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m.run_command("nix-channel --update")
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version = m.run_command("nix-instantiate --eval-only -A lib.nixpkgsVersion '<nixpkgs>'", capture_stdout=True).split(' ')[0].replace('"','').strip()
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print >> sys.stderr, "NixOS version is {0}".format(version)
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if args.hvm:
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m.upload_file("./amazon-base-config.nix", "/mnt/etc/nixos/amazon-base-config.nix")
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m.upload_file("./amazon-hvm-config.nix", "/mnt/etc/nixos/configuration.nix")
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m.upload_file("./amazon-hvm-install-config.nix", "/mnt/etc/nixos/amazon-hvm-install-config.nix")
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m.run_command("NIXOS_CONFIG=/etc/nixos/amazon-hvm-install-config.nix nixos-install")
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else:
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m.upload_file("./amazon-base-config.nix", "/mnt/etc/nixos/configuration.nix")
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m.run_command("nixos-install")
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m.run_command("umount /mnt")
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if args.hvm:
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ami_name = "nixos-{0}-x86_64-hvm".format(version)
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description = "NixOS {0} (x86_64; EBS root; hvm)".format(version)
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else:
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ami_name = "nixos-{0}-x86_64-ebs".format(version)
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description = "NixOS {0} (x86_64; EBS root)".format(version)
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# Wait for the snapshot to finish.
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def check():
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status = snapshot.update()
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print >> sys.stderr, "snapshot status is {0}".format(status)
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return status == '100%'
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m.connect()
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volume = m._conn.get_all_volumes([], filters={'attachment.instance-id': m.resource_id, 'attachment.device': "/dev/sdg"})[0]
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# Create a snapshot.
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snapshot = volume.create_snapshot(description=description)
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print >> sys.stderr, "created snapshot {0}".format(snapshot.id)
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nixops.util.check_wait(check, max_tries=120)
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m._conn.create_tags([snapshot.id], {'Name': ami_name})
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if not args.keep: depl.destroy_resources()
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# Register the image.
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aki = m._conn.get_all_images(filters={'manifest-location': 'ec2*pv-grub-hd0_1.03-x86_64*'})[0]
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print >> sys.stderr, "using kernel image {0} - {1}".format(aki.id, aki.location)
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block_map = BlockDeviceMapping()
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block_map[root_block] = BlockDeviceType(snapshot_id=snapshot.id, delete_on_termination=True, size=ebs_size, volume_type="gp2")
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block_map['/dev/sdb'] = BlockDeviceType(ephemeral_name="ephemeral0")
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block_map['/dev/sdc'] = BlockDeviceType(ephemeral_name="ephemeral1")
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block_map['/dev/sdd'] = BlockDeviceType(ephemeral_name="ephemeral2")
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block_map['/dev/sde'] = BlockDeviceType(ephemeral_name="ephemeral3")
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common_args = dict(
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name=ami_name,
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description=description,
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architecture="x86_64",
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root_device_name=root_block,
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block_device_map=block_map,
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virtualization_type=virtualization_type,
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delete_root_volume_on_termination=True
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)
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if not args.hvm:
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common_args['kernel_id']=aki.id
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ami_id = m._conn.register_image(**common_args)
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print >> sys.stderr, "registered AMI {0}".format(ami_id)
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print >> sys.stderr, "sleeping a bit..."
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time.sleep(30)
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print >> sys.stderr, "setting image name..."
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m._conn.create_tags([ami_id], {'Name': ami_name})
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print >> sys.stderr, "making image public..."
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image = m._conn.get_all_images(image_ids=[ami_id])[0]
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image.set_launch_permissions(user_ids=[], group_names=["all"])
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# Do a test deployment to make sure that the AMI works.
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f = open("ebs-test.nix", "w")
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f.write(
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'''
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{{
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network.description = "NixOS EBS test";
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resources.ec2KeyPairs.keypair.accessKeyId = "lb-nixos";
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resources.ec2KeyPairs.keypair.region = "{0}";
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machine = {{ config, pkgs, resources, ... }}: {{
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deployment.targetEnv = "ec2";
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deployment.ec2.accessKeyId = "lb-nixos";
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deployment.ec2.region = "{0}";
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deployment.ec2.instanceType = "{2}";
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deployment.ec2.keyPair = resources.ec2KeyPairs.keypair.name;
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deployment.ec2.securityGroups = [ "public-ssh" ];
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deployment.ec2.ami = "{1}";
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}};
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}}
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'''.format(args.region, ami_id, instance_type))
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f.close()
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test_depl = db.create_deployment()
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test_depl.auto_response = "y"
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test_depl.name = "ebs-creator-test"
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test_depl.nix_exprs = [os.path.abspath("./ebs-test.nix")]
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test_depl.deploy(create_only=True)
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test_depl.machines['machine'].run_command("nixos-version")
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# Log the AMI ID.
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f = open("ec2-amis.nix".format(args.region, image_type), "w")
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f.write("{\n")
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for dest in [ 'us-east-1', 'us-west-1', 'us-west-2', 'eu-west-1', 'eu-central-1', 'ap-southeast-1', 'ap-southeast-2', 'ap-northeast-1', 'sa-east-1']:
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copy_image = None
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if args.region != dest:
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try:
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print >> sys.stderr, "copying image from region {0} to {1}".format(args.region, dest)
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conn = boto.ec2.connect_to_region(dest)
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copy_image = conn.copy_image(args.region, ami_id, ami_name, description=None, client_token=None)
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except :
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print >> sys.stderr, "FAILED!"
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# Log the AMI ID.
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if copy_image != None:
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f.write(' "{0}"."{1}".{2} = "{3}";\n'.format(args.channel,dest,"hvm" if args.hvm else "ebs",copy_image.image_id))
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else:
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f.write(' "{0}"."{1}".{2} = "{3}";\n'.format(args.channel,args.region,"hvm" if args.hvm else "ebs",ami_id))
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f.write("}\n")
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f.close()
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if not args.keep:
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test_depl.logger.set_autoresponse("y")
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test_depl.destroy_resources()
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test_depl.delete()
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