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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Jakob L. Kreuze <>
;;; This file is part of GNU Guix.
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <>.
(define-module (gnu machine digital-ocean)
#:use-module (gnu machine ssh)
#:use-module (gnu machine)
#:use-module (gnu services)
#:use-module (gnu services networking)
#:use-module (gnu system)
#:use-module (gnu system pam)
#:use-module (guix base32)
#:use-module (guix derivations)
#:use-module (guix i18n)
#:use-module (guix import json)
#:use-module (guix monads)
#:use-module (guix records)
#:use-module (guix ssh)
#:use-module (guix store)
#:use-module (ice-9 iconv)
#:use-module (json)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-2)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ssh key)
#:use-module (ssh sftp)
#:use-module (ssh shell)
#:use-module (web client)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:export (digital-ocean-configuration
;;; Commentary:
;;; This module implements a high-level interface for provisioning "droplets"
;;; from the Digital Ocean virtual private server (VPS) service.
;;; Code:
(define %api-base "")
(define %digital-ocean-token
(make-parameter (getenv "GUIX_DIGITAL_OCEAN_TOKEN")))
(define* (post-endpoint endpoint body)
"Encode BODY as JSON and send it to the Digital Ocean API endpoint
ENDPOINT. This procedure is quite a bit more specialized than 'http-post', as
it takes care to set headers such as 'Content-Type', 'Content-Length', and
'Authorization' appropriately."
(let* ((uri (string->uri (string-append %api-base endpoint)))
(body (string->bytevector (scm->json-string body) "UTF-8"))
(headers `((User-Agent . "Guix Deploy")
(Accept . "application/json")
(Content-Type . "application/json")
(Authorization . ,(format #f "Bearer ~a"
(Content-Length . ,(number->string
(bytevector-length body)))))
(port (open-socket-for-uri uri))
(request (build-request uri
#:method 'POST
#:version '(1 . 1)
#:headers headers
#:port port))
(request (write-request request port)))
(write-request-body request body)
(force-output (request-port request))
(let* ((response (read-response port))
(body (read-response-body response)))
(unless (= 2 (floor/ (response-code response) 100))
(condition (&message
(message (format
(G_ "~a: HTTP post failed: ~a (~s)")
(uri->string uri)
(response-code response)
(response-reason-phrase response)))))))
(close-port port)
(bytevector->string body "UTF-8"))))
(define (fetch-endpoint endpoint)
"Return the contents of the Digital Ocean API endpoint ENDPOINT as an
alist. This procedure is quite a bit more specialized than 'json-fetch', as it
takes care to set headers such as 'Accept' and 'Authorization' appropriately."
(define headers
`((user-agent . "Guix Deploy")
(Accept . "application/json")
(Authorization . ,(format #f "Bearer ~a" (%digital-ocean-token)))))
(json-fetch (string-append %api-base endpoint) #:headers headers))
;;; Parameters for droplet creation.
(define-record-type* <digital-ocean-configuration> digital-ocean-configuration
(ssh-key digital-ocean-configuration-ssh-key) ; string
(tags digital-ocean-configuration-tags) ; list of strings
(region digital-ocean-configuration-region) ; string
(size digital-ocean-configuration-size) ; string
(enable-ipv6? digital-ocean-configuration-enable-ipv6?)) ; boolean
(define (read-key-fingerprint file-name)
"Read the private key at FILE-NAME and return the key's fingerprint as a hex
(let* ((privkey (private-key-from-file file-name))
(pubkey (private-key->public-key privkey))
(hash (get-public-key-hash pubkey 'md5)))
(bytevector->hex-string hash)))
(define (machine-droplet machine)
"Return an alist describing the droplet allocated to MACHINE."
(let ((tags (digital-ocean-configuration-tags
(machine-configuration machine))))
(find (lambda (droplet)
(equal? (assoc-ref droplet "tags") (list->vector tags)))
(assoc-ref (fetch-endpoint "/v2/droplets") "droplets")))))
(define (machine-public-ipv4-network machine)
"Return the public IPv4 network interface of the droplet allocated to
MACHINE as an alist. The expected fields are 'ip_address', 'netmask', and
(and-let* ((droplet (machine-droplet machine))
(networks (assoc-ref droplet "networks"))
(network (find (lambda (network)
(string= "public" (assoc-ref network "type")))
(vector->list (assoc-ref networks "v4")))))
;;; Remote evaluation.
(define (digital-ocean-remote-eval target exp)
"Internal implementation of 'machine-remote-eval' for MACHINE instances with
an environment type of 'digital-ocean-environment-type'."
(let* ((network (machine-public-ipv4-network target))
(address (assoc-ref network "ip_address"))
(ssh-key (digital-ocean-configuration-ssh-key
(machine-configuration target)))
(delegate (machine
(inherit target)
(environment managed-host-environment-type)
(host-name address)
(identity ssh-key)
(system "x86_64-linux"))))))
(machine-remote-eval delegate exp)))
;;; System deployment.
;; The following script was adapted from the guide available at
;; <>.
(define (guix-infect network)
"Given NETWORK, an alist describing the Droplet's public IPv4 network
interface, return a Bash script that will install the Guix system."
(format #f "#!/bin/bash
apt-get update
apt-get install xz-utils -y
cd /tmp
tar --warning=no-timestamp -xf ~~/guix-binary-1.0.1.x86_64-linux.tar.xz
mv var/guix /var/ && mv gnu /
mkdir -p ~~root/.config/guix
ln -sf /var/guix/profiles/per-user/root/current-guix ~~root/.config/guix/current
export GUIX_PROFILE=\"`echo ~~root`/.config/guix/current\" ;
source $GUIX_PROFILE/etc/profile
groupadd --system guixbuild
for i in `seq -w 1 10`; do
useradd -g guixbuild -G guixbuild \
-d /var/empty -s `which nologin` \
-c \"Guix build user $i\" --system \
cp ~~root/.config/guix/current/lib/systemd/system/guix-daemon.service /etc/systemd/system/
systemctl start guix-daemon && systemctl enable guix-daemon
mkdir -p /usr/local/bin
cd /usr/local/bin
ln -s /var/guix/profiles/per-user/root/current-guix/bin/guix
mkdir -p /usr/local/share/info
cd /usr/local/share/info
for i in /var/guix/profiles/per-user/root/current-guix/share/info/*; do
ln -s $i;
guix archive --authorize < ~~root/.config/guix/current/share/guix/
# guix pull
guix package -i glibc-utf8-locales
export GUIX_LOCPATH=\"$HOME/.guix-profile/lib/locale\"
guix package -i openssl
cat > /etc/bootstrap-config.scm << EOF
(use-modules (gnu))
(use-service-modules networking ssh)
(host-name \"gnu-bootstrap\")
(timezone \"Etc/UTC\")
(bootloader (bootloader-configuration
(bootloader grub-bootloader)
(target \"/dev/vda\")
(terminal-outputs '(console))))
(file-systems (cons (file-system
(mount-point \"/\")
(device \"/dev/vda1\")
(type \"ext4\"))
(append (list (static-networking-service \"eth0\" \"~a\"
#:netmask \"~a\"
#:gateway \"~a\"
#:name-servers '(\"\" \"\"))
(simple-service 'guile-load-path-in-global-env
. \"/run/current-system/profile/share/guile/site/2.2\")
. ,(string-append \"/run/current-system/profile/lib/guile/2.2/site-ccache:\"
(service openssh-service-type
(log-level 'debug)
(permit-root-login 'without-password))))
# guix pull
guix system build /etc/bootstrap-config.scm
guix system reconfigure /etc/bootstrap-config.scm
mv /etc /old-etc
mkdir /etc
cp -r /old-etc/{passwd,group,shadow,gshadow,mtab,guix,bootstrap-config.scm} /etc/
guix system reconfigure /etc/bootstrap-config.scm"
(assoc-ref network "ip_address")
(assoc-ref network "netmask")
(assoc-ref network "gateway")))
(define (machine-wait-until-available machine)
"Block until the initial Debian image has been installed on the droplet
(and-let* ((droplet (machine-droplet machine))
(droplet-id (assoc-ref droplet "id"))
(endpoint (format #f "/v2/droplets/~a/actions" droplet-id)))
(let loop ()
(let ((actions (assoc-ref (fetch-endpoint endpoint) "actions")))
(unless (every (lambda (action)
(string= "completed" (assoc-ref action "status")))
(vector->list actions))
(sleep 5)
(define (wait-for-ssh address ssh-key)
"Block until the an SSH session can be made as 'root' with SSH-KEY at ADDRESS."
(let loop ()
(catch #t
(lambda ()
(open-ssh-session address #:user "root" #:identity ssh-key))
(lambda args
(sleep 5)
(define (add-static-networking target network)
"Return an <operating-system> based on TARGET with a static networking
configuration for the public IPv4 network described by the alist NETWORK."
(inherit (machine-operating-system target))
(services (cons* (static-networking-service "eth0"
(assoc-ref network "ip_address")
#:netmask (assoc-ref network "netmask")
#:gateway (assoc-ref network "gateway")
#:name-servers '("" ""))
(simple-service 'guile-load-path-in-global-env
. "/run/current-system/profile/share/guile/site/2.2")
. ,(string-append "/run/current-system/profile/lib/guile/2.2/site-ccache:"
(machine-operating-system target))))))
(define (deploy-digital-ocean target)
"Internal implementation of 'deploy-machine' for 'machine' instances with an
environment type of 'digital-ocean-environment-type'."
(maybe-raise-unsupported-configuration-error target)
(let* ((config (machine-configuration target))
(name (machine-display-name target))
(region (digital-ocean-configuration-region config))
(size (digital-ocean-configuration-size config))
(ssh-key (digital-ocean-configuration-ssh-key config))
(fingerprint (read-key-fingerprint ssh-key))
(enable-ipv6? (digital-ocean-configuration-enable-ipv6? config))
(tags (digital-ocean-configuration-tags config))
(request-body `(("name" . ,name)
("region" . ,region)
("size" . ,size)
("image" . "debian-9-x64")
("ssh_keys" . ,(vector fingerprint))
("backups" . #f)
("ipv6" . ,enable-ipv6?)
("user_data" . #nil)
("private_networking" . #nil)
("volumes" . #nil)
("tags" . ,(list->vector tags))))
(response (post-endpoint "/v2/droplets" request-body)))
(machine-wait-until-available target)
(let* ((network (machine-public-ipv4-network target))
(address (assoc-ref network "ip_address")))
(wait-for-ssh address ssh-key)
(let* ((ssh-session (open-ssh-session address #:user "root" #:identity ssh-key))
(sftp-session (make-sftp-session ssh-session)))
(call-with-remote-output-file sftp-session "/tmp/"
(lambda (port)
(display (guix-infect network) port)))
(rexec ssh-session "/bin/bash /tmp/")
;; Session will close upon rebooting, which will raise 'guile-ssh-error.
(catch 'guile-ssh-error
(lambda () (rexec ssh-session "reboot"))
(lambda args #t)))
(wait-for-ssh address ssh-key)
(let ((delegate (machine
(operating-system (add-static-networking target network))
(environment managed-host-environment-type)
(host-name address)
(identity ssh-key)
(system "x86_64-linux"))))))
(deploy-machine delegate)))))
;;; Roll-back.
(define (roll-back-digital-ocean target)
"Internal implementation of 'roll-back-machine' for MACHINE instances with an
environment type of 'digital-ocean-environment-type'."
(let* ((network (machine-public-ipv4-network target))
(address (assoc-ref network "ip_address"))
(ssh-key (digital-ocean-configuration-ssh-key
(machine-configuration target)))
(delegate (machine
(inherit target)
(environment managed-host-environment-type)
(host-name address)
(identity ssh-key)
(system "x86_64-linux"))))))
(roll-back-machine delegate)))
;;; Environment type.
(define digital-ocean-environment-type
(machine-remote-eval digital-ocean-remote-eval)
(deploy-machine deploy-digital-ocean)
(roll-back-machine roll-back-digital-ocean)
(name 'digital-ocean-environment-type)
(description "Provisioning of \"droplets\": virtual machines
provided by the Digital Ocean virtual private server (VPS) service.")))
(define (maybe-raise-missing-api-key-error)
(unless (%digital-ocean-token)
(raise (condition
(message (G_ "No Digital Ocean access token was provided. This \
may be fixed by setting the environment variable GUIX_DIGITAL_OCAEN_TOKEN to \
one procured from")))))))
(define (maybe-raise-unsupported-configuration-error machine)
"Raise an error if MACHINE's configuration is not an instance of
(let ((config (machine-configuration machine))
(environment (environment-type-name (machine-environment machine))))
(unless (and config (digital-ocean-configuration? config))
(raise (condition
(message (format #f (G_ "unsupported machine configuration '~a'
for environment of type '~a'")