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|
#!/usr/bin/env nix-shell
#!nix-shell -p awscli -p jq -p qemu -i bash
# shellcheck shell=bash
# Uploads and registers NixOS images built from the
# <nixos/release.nix> amazonImage attribute. Images are uploaded and
# registered via a home region, and then copied to other regions.
# The home region requires an s3 bucket, and a "vmimport" IAM role
# with access to the S3 bucket. Configuration of the vmimport role is
# documented in
# https://docs.aws.amazon.com/vm-import/latest/userguide/vmimport-image-import.html
# set -x
set -euo pipefail
# configuration
state_dir=$HOME/amis/ec2-images
home_region=eu-west-1
bucket=nixos-amis
regions=(eu-west-1 eu-west-2 eu-west-3 eu-central-1 eu-north-1
us-east-1 us-east-2 us-west-1 us-west-2
ca-central-1
ap-southeast-1 ap-southeast-2 ap-northeast-1 ap-northeast-2
ap-south-1 ap-east-1
sa-east-1)
log() {
echo "$@" >&2
}
if [ "$#" -ne 1 ]; then
log "Usage: ./upload-amazon-image.sh IMAGE_OUTPUT"
exit 1
fi
# result of the amazon-image from nixos/release.nix
store_path=$1
if [ ! -e "$store_path" ]; then
log "Store path: $store_path does not exist, fetching..."
nix-store --realise "$store_path"
fi
if [ ! -d "$store_path" ]; then
log "store_path: $store_path is not a directory. aborting"
exit 1
fi
read_image_info() {
if [ ! -e "$store_path/nix-support/image-info.json" ]; then
log "Image missing metadata"
exit 1
fi
jq -r "$1" "$store_path/nix-support/image-info.json"
}
# We handle a single image per invocation, store all attributes in
# globals for convenience.
image_label=$(read_image_info .label)
image_system=$(read_image_info .system)
image_file=$(read_image_info .file)
image_logical_bytes=$(read_image_info .logical_bytes)
# Derived attributes
image_logical_gigabytes=$(((image_logical_bytes-1)/1024/1024/1024+1)) # Round to the next GB
case "$image_system" in
aarch64-linux)
amazon_arch=arm64
;;
x86_64-linux)
amazon_arch=x86_64
;;
*)
log "Unknown system: $image_system"
exit 1
esac
image_name="NixOS-${image_label}-${image_system}"
image_description="NixOS ${image_label} ${image_system}"
log "Image Details:"
log " Name: $image_name"
log " Description: $image_description"
log " Size (gigabytes): $image_logical_gigabytes"
log " System: $image_system"
log " Amazon Arch: $amazon_arch"
read_state() {
local state_key=$1
local type=$2
cat "$state_dir/$state_key.$type" 2>/dev/null || true
}
write_state() {
local state_key=$1
local type=$2
local val=$3
mkdir -p "$state_dir"
echo "$val" > "$state_dir/$state_key.$type"
}
wait_for_import() {
local region=$1
local task_id=$2
local state snapshot_id
log "Waiting for import task $task_id to be completed"
while true; do
read -r state progress snapshot_id < <(
aws ec2 describe-import-snapshot-tasks --region "$region" --import-task-ids "$task_id" | \
jq -r '.ImportSnapshotTasks[].SnapshotTaskDetail | "\(.Status) \(.Progress) \(.SnapshotId)"'
)
log " ... state=$state progress=$progress snapshot_id=$snapshot_id"
case "$state" in
active)
sleep 10
;;
completed)
echo "$snapshot_id"
return
;;
*)
log "Unexpected snapshot import state: '${state}'"
exit 1
;;
esac
done
}
wait_for_image() {
local region=$1
local ami_id=$2
local state
log "Waiting for image $ami_id to be available"
while true; do
read -r state < <(
aws ec2 describe-images --image-ids "$ami_id" --region "$region" | \
jq -r ".Images[].State"
)
log " ... state=$state"
case "$state" in
pending)
sleep 10
;;
available)
return
;;
*)
log "Unexpected AMI state: '${state}'"
exit 1
;;
esac
done
}
make_image_public() {
local region=$1
local ami_id=$2
wait_for_image "$region" "$ami_id"
log "Making image $ami_id public"
aws ec2 modify-image-attribute \
--image-id "$ami_id" --region "$region" --launch-permission 'Add={Group=all}' >&2
}
upload_image() {
local region=$1
local aws_path=${image_file#/}
local state_key="$region.$image_label.$image_system"
local task_id
task_id=$(read_state "$state_key" task_id)
local snapshot_id
snapshot_id=$(read_state "$state_key" snapshot_id)
local ami_id
ami_id=$(read_state "$state_key" ami_id)
if [ -z "$task_id" ]; then
log "Checking for image on S3"
if ! aws s3 ls --region "$region" "s3://${bucket}/${aws_path}" >&2; then
log "Image missing from aws, uploading"
aws s3 cp --region "$region" "$image_file" "s3://${bucket}/${aws_path}" >&2
fi
log "Importing image from S3 path s3://$bucket/$aws_path"
task_id=$(aws ec2 import-snapshot --disk-container "{
\"Description\": \"nixos-image-${image_label}-${image_system}\",
\"Format\": \"vhd\",
\"UserBucket\": {
\"S3Bucket\": \"$bucket\",
\"S3Key\": \"$aws_path\"
}
}" --region "$region" | jq -r '.ImportTaskId')
write_state "$state_key" task_id "$task_id"
fi
if [ -z "$snapshot_id" ]; then
snapshot_id=$(wait_for_import "$region" "$task_id")
write_state "$state_key" snapshot_id "$snapshot_id"
fi
if [ -z "$ami_id" ]; then
log "Registering snapshot $snapshot_id as AMI"
local block_device_mappings=(
"DeviceName=/dev/xvda,Ebs={SnapshotId=$snapshot_id,VolumeSize=$image_logical_gigabytes,DeleteOnTermination=true,VolumeType=gp2}"
)
local extra_flags=(
--root-device-name /dev/xvda
--sriov-net-support simple
--ena-support
--virtualization-type hvm
)
block_device_mappings+=("DeviceName=/dev/sdb,VirtualName=ephemeral0")
block_device_mappings+=("DeviceName=/dev/sdc,VirtualName=ephemeral1")
block_device_mappings+=("DeviceName=/dev/sdd,VirtualName=ephemeral2")
block_device_mappings+=("DeviceName=/dev/sde,VirtualName=ephemeral3")
ami_id=$(
aws ec2 register-image \
--name "$image_name" \
--description "$image_description" \
--region "$region" \
--architecture $amazon_arch \
--block-device-mappings "${block_device_mappings[@]}" \
"${extra_flags[@]}" \
| jq -r '.ImageId'
)
write_state "$state_key" ami_id "$ami_id"
fi
make_image_public "$region" "$ami_id"
echo "$ami_id"
}
copy_to_region() {
local region=$1
local from_region=$2
local from_ami_id=$3
state_key="$region.$image_label.$image_system"
ami_id=$(read_state "$state_key" ami_id)
if [ -z "$ami_id" ]; then
log "Copying $from_ami_id to $region"
ami_id=$(
aws ec2 copy-image \
--region "$region" \
--source-region "$from_region" \
--source-image-id "$from_ami_id" \
--name "$image_name" \
--description "$image_description" \
| jq -r '.ImageId'
)
write_state "$state_key" ami_id "$ami_id"
fi
make_image_public "$region" "$ami_id"
echo "$ami_id"
}
upload_all() {
home_image_id=$(upload_image "$home_region")
jq -n \
--arg key "$home_region.$image_system" \
--arg value "$home_image_id" \
'$ARGS.named'
for region in "${regions[@]}"; do
if [ "$region" = "$home_region" ]; then
continue
fi
copied_image_id=$(copy_to_region "$region" "$home_region" "$home_image_id")
jq -n \
--arg key "$region.$image_system" \
--arg value "$copied_image_id" \
'$ARGS.named'
done
}
upload_all | jq --slurp from_entries
|