174 lines
6.7 KiB
Python
Executable file
174 lines
6.7 KiB
Python
Executable file
#! /usr/bin/env python
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import sys
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from charon import deployment
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from boto.ec2.blockdevicemapping import BlockDeviceMapping, BlockDeviceType
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import charon.util
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import time
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import argparse
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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')
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parser.add_argument('--key', dest='key_name', default="eelco", help='EC2 keypair')
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parser.add_argument('--keep', dest='keep', action='store_true', help='Keep Charon machine after use')
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parser.add_argument('--hvm', dest='hvm', action='store_true', help='Create HVM image')
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args = parser.parse_args()
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instance_type = "cc1.4xlarge" if args.hvm else "m1.small"
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key_name = args.key_name
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ebs_size = 8 if args.hvm else 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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machine =
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{{ pkgs, ... }}:
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{{
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deployment.ec2.region = "{0}";
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deployment.ec2.keyPair = pkgs.lib.mkOverride 10 "{1}";
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deployment.ec2.blockDeviceMapping."/dev/xvdg".size = pkgs.lib.mkOverride 10 {2};
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}};
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}}
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'''.format(args.region, key_name, ebs_size))
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f.close()
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depl = deployment.Deployment("./ebs-creator.json", create=True, nix_exprs=["./ebs-creator.nix", "./ebs-creator-config.nix"])
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if not args.keep: depl.destroy_vms()
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depl.deploy()
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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 http://nixos.org/releases/nixos/channels/nixos-unstable")
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m.run_command("nix-channel --update")
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m.run_command("nixos-rebuild switch")
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version = m.run_command("nixos-version", capture_stdout=True).replace('"', '').rstrip()
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print >> sys.stderr, "NixOS version is {0}".format(version)
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m.run_command("cp -f $(nix-instantiate --find-file nixos/modules/virtualisation/amazon-config.nix) /mnt/etc/nixos/configuration.nix")
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m.run_command("nixos-install")
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if args.hvm:
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m.run_command('cp /nix/store/*-grub-0.97*/lib/grub/i386-pc/* /mnt/boot/grub')
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m.run_command('sed -i "s|hd0|hd0,0|" /mnt/boot/grub/menu.lst')
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m.run_command('echo "(hd1) /dev/xvdg" > device.map')
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m.run_command('echo -e "root (hd1,0)\nsetup (hd1)" | grub --device-map=device.map --batch')
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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-ebs-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._instance_id, 'attachment.device': "/dev/sdg"})[0]
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if args.hvm:
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instance = m._conn.run_instances( image_id="ami-6a9e4503"
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, instance_type=instance_type
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, key_name=key_name
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, placement=m._zone
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, security_groups=["eelco-test"]).instances[0]
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charon.util.check_wait(lambda: instance.update() == 'running', max_tries=120)
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instance.stop()
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charon.util.check_wait(lambda: instance.update() == 'stopped', max_tries=120)
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old_root_volume = m._conn.get_all_volumes([], filters={'attachment.instance-id': instance.id, 'attachment.device': "/dev/sda1"})[0]
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old_root_volume.detach()
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volume.detach()
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charon.util.check_wait(lambda: volume.update() == 'available', max_tries=120)
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charon.util.check_wait(lambda: old_root_volume.update() == 'available', max_tries=120)
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volume.attach(instance.id, '/dev/sda1')
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charon.util.check_wait(lambda: volume.update() == 'in-use', max_tries=120)
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ami_id = m._conn.create_image(instance.id, ami_name, description)
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time.sleep(5)
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image = m._conn.get_all_images([ami_id])[0]
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charon.util.check_wait(lambda: image.update() == 'available', max_tries=120)
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instance.terminate()
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else:
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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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charon.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_vms()
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# Register the image.
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aki = m._conn.get_all_images(filters={'manifest-location': '*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['/dev/sda'] = BlockDeviceType(snapshot_id=snapshot.id, delete_on_termination=True)
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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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ami_id = m._conn.register_image(
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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="/dev/sda",
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kernel_id=aki.id,
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block_device_map=block_map)
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print >> sys.stderr, "registered AMI {0}".format(ami_id)
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time.sleep(5)
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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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m._conn.create_tags([ami_id], {'Name': ami_name})
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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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{{ network.description = "NixOS EBS test";
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machine.deployment.targetEnv = "ec2";
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machine.deployment.ec2.region = "{0}";
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machine.deployment.ec2.instanceType = "{2}";
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machine.deployment.ec2.keyPair = "{3}";
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machine.deployment.ec2.securityGroups = [ "eelco-test" ];
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machine.deployment.ec2.ami = "{1}";
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machine.fileSystems = [];
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}}
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'''.format(args.region, ami_id, instance_type, key_name))
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f.close()
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test_depl = deployment.Deployment("./ebs-test.json", create=True, nix_exprs=["./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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if not args.keep: test_depl.destroy_vms()
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# Log the AMI ID.
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f = open("{0}.ebs.ami-id".format(args.region), "w")
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f.write("{0}".format(ami_id))
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f.close()
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