Enable labeling containers

Enabling the faasd-provider to label containers

Signed-off-by: Martin Dekov <mvdekov@gmail.com>

Gopkg.lock

@@ -55,7 +55,7 @@
   version = "0.7.1"
 
 [[projects]]
-  digest = "1:386ca0ac781cc1b630b3ed21725759770174140164b3faf3810e6ed6366a970b"
+  digest = "1:cf83a14c8042951b0dcd74758fc32258111ecc7838cbdf5007717172cab9ca9b"
   name = "github.com/containerd/containerd"
   packages = [
     ".",
@@ -103,6 +103,7 @@
     "remotes/docker/schema1",
     "rootfs",
     "runtime/linux/runctypes",
+    "runtime/v2/logging",
     "runtime/v2/runc/options",
     "snapshots",
     "snapshots/proxy",
@@ -169,6 +170,14 @@
   revision = "4cfb7b568922a3c79a23e438dc52fe537fc9687e"
   version = "v0.7.1"
 
+[[projects]]
+  digest = "1:bcf36df8d43860bfde913d008301aef27c6e9a303582118a837c4a34c0d18167"
+  name = "github.com/coreos/go-systemd"
+  packages = ["journal"]
+  pruneopts = "UT"
+  revision = "2d78030078ef61b3cae27f42ad6d0e46db51b339"
+  version = "v22.0.0"
+
 [[projects]]
   digest = "1:92ebc9c068ab8e3fff03a58694ee33830964f6febd0130069aadce328802de14"
   name = "github.com/docker/cli"
@@ -574,7 +583,9 @@
     "github.com/containerd/containerd/oci",
     "github.com/containerd/containerd/remotes",
     "github.com/containerd/containerd/remotes/docker",
+    "github.com/containerd/containerd/runtime/v2/logging",
     "github.com/containerd/go-cni",
+    "github.com/coreos/go-systemd/journal",
     "github.com/docker/cli/cli/config",
     "github.com/docker/cli/cli/config/configfile",
     "github.com/docker/distribution/reference",

README.md

@@ -19,10 +19,10 @@ faasd is the same OpenFaaS experience and ecosystem, but without Kubernetes. Fun
 
 ## What does faasd deploy?
 
-* faasd - itself, and its [faas-provider](https://github.com/openfaas/faas-provider) for containerd
-* [Prometheus](https://github.com/prometheus/prometheus)
-* [OpenFaaS Gateway & UI](https://github.com/openfaas/faas/tree/master/gateway)
-* [OpenFaaS queue-worker for NATS](https://github.com/openfaas/nats-queue-worker)
+* faasd - itself, and its [faas-provider](https://github.com/openfaas/faas-provider) for containerd - CRUD for functions and services, implements the OpenFaaS REST API
+* [Prometheus](https://github.com/prometheus/prometheus) - for monitoring of services, metrics, scaling and dashboards
+* [OpenFaaS Gateway](https://github.com/openfaas/faas/tree/master/gateway) - the UI portal, CLI, and other OpenFaaS tooling can talk to this.
+* [OpenFaaS queue-worker for NATS](https://github.com/openfaas/nats-queue-worker) - run your invocations in the background without adding any code. See also: [asynchronous invocations](https://docs.openfaas.com/reference/triggers/#async-nats-streaming)
 * [NATS](https://nats.io) for asynchronous processing and queues
 
 You'll also need:
@@ -35,9 +35,11 @@ You can use the standard [faas-cli](https://github.com/openfaas/faas-cli) along
 
 ## Tutorials
 
-### Get started on DigitalOcean or with cloud-init
+### Get started on DigitalOcean, or any other IaaS
 
-* [Build a Serverless appliance with cloud-init and faasd](https://blog.alexellis.io/deploy-serverless-faasd-with-cloud-init/)
+If your IaaS supports `user_data` aka "cloud-init", then this guide is for you. If not, then checkout the approach and feel free to run each step manually.
+
+* [Build a Serverless appliance with faasd](https://blog.alexellis.io/deploy-serverless-faasd-with-cloud-init/)
 
 ### Run locally on MacOS, Linux, or Windows with Multipass.run
 
@@ -49,14 +51,69 @@ You can run this tutorial on your Raspberry Pi, or adapt the steps for a regular
 
 * [faasd - lightweight Serverless for your Raspberry Pi](https://blog.alexellis.io/faasd-for-lightweight-serverless/)
 
-### Using private repos
+### Terraform for DigitalOcean
+
+Automate everything within < 60 seconds and get a public URL and IP address back. Customise as required, or adapt to your preferred cloud such as AWS EC2.
+
+* [Provision faasd 0.7.5 on DigitalOcean with Terraform 0.12.0](https://gist.github.com/alexellis/fd618bd2f957eb08c44d086ef2fc3906)
+
+### A note on private repos / registries
 
 To use private image repos, `~/.docker/config.json` needs to be copied to `/var/lib/faasd/.docker/config.json`.
 
+If you'd like to set up your own private registry, [see this tutorial](https://blog.alexellis.io/get-a-tls-enabled-docker-registry-in-5-minutes/).
+
+Beware that running `docker login` on MacOS and Windows may create an empty file with your credentials stored in the system helper.
+
+Alternatively, use you can use the `registry-login` command from the OpenFaaS Cloud bootstrap tool (ofc-bootstrap):
+
+```bash
+curl -sLSf https://raw.githubusercontent.com/openfaas-incubator/ofc-bootstrap/master/get.sh | sudo sh
+
+ofc-bootstrap registry-login --username <your-registry-username> --password-stdin
+# (the enter your password and hit return)
+```
+The file will be created in `./credentials/`
+
+### Logs for functions
+
+You can view the logs of functions using `journalctl`:
+
+```bash
+journalctl -t openfaas-fn:FUNCTION_NAME
+
+
+faas-cli store deploy figlet
+journalctl -t openfaas-fn:figlet -f &
+echo logs | faas-cli invoke figlet
+```
+
 ### Manual / developer instructions
 
 See [here for manual / developer instructions](docs/DEV.md)
 
+## Getting help
+
+### Docs
+
+The [OpenFaaS docs](https://docs.openfaas.com/) provide a wealth of information and are kept up to date with new features.
+
+### Function and template store
+
+For community functions see `faas-cli store --help`
+
+For templates built by the community see: `faas-cli template store list`, you can also use the `dockerfile` template if you just want to migrate an existing service without the benefits of using a template.
+
+### Workshop
+
+[The OpenFaaS workshop](https://github.com/openfaas/workshop/) is a set of 12 self-paced labs and provides a great starting point
+
+### Community support
+
+An active community of almost 3000 users awaits you on Slack. Over 250 of those users are also contributors and help maintain the code.
+
+* [Join Slack](https://slack.openfaas.io/)
+
 ## Backlog
 
 ### Supported operations
@@ -78,8 +135,8 @@ Scale from and to zero is also supported. On a Dell XPS with a small, pre-pulled
 
 Other operations are pending development in the provider such as:
 
-* `faas logs` - to stream logs on-demand for a known function
-* `faas auth` - for the OAuth2 and OIDC integration
+* `faas logs` - to stream logs on-demand for a known function, for the time being you can find logs via `journalctl -u faasd-provider`
+* `faas auth` - supported for Basic Authentication, but OAuth2 & OIDC require a patch
 
 ## Todo
 

cloud-config.txt

@@ -11,12 +11,13 @@ runcmd:
 - curl -sLSf https://github.com/containerd/containerd/releases/download/v1.3.2/containerd-1.3.2.linux-amd64.tar.gz > /tmp/containerd.tar.gz && tar -xvf /tmp/containerd.tar.gz -C /usr/local/bin/ --strip-components=1
 - curl -SLfs https://raw.githubusercontent.com/containerd/containerd/v1.3.2/containerd.service | tee /etc/systemd/system/containerd.service
 - systemctl daemon-reload && systemctl start containerd
+- systemctl enable containerd
 - /sbin/sysctl -w net.ipv4.conf.all.forwarding=1
 - mkdir -p /opt/cni/bin
 - curl -sSL https://github.com/containernetworking/plugins/releases/download/v0.8.5/cni-plugins-linux-amd64-v0.8.5.tgz | tar -xz -C /opt/cni/bin
 - mkdir -p /go/src/github.com/openfaas/
 - cd /go/src/github.com/openfaas/ && git clone https://github.com/openfaas/faasd
-- curl -fSLs "https://github.com/openfaas/faasd/releases/download/0.7.4/faasd" --output "/usr/local/bin/faasd" && chmod a+x "/usr/local/bin/faasd"
+- curl -fSLs "https://github.com/openfaas/faasd/releases/download/0.7.5/faasd" --output "/usr/local/bin/faasd" && chmod a+x "/usr/local/bin/faasd"
 - cd /go/src/github.com/openfaas/faasd/ && /usr/local/bin/faasd install
 - systemctl status -l containerd --no-pager
 - journalctl -u faasd-provider --no-pager

cmd/collect.go

@@ -0,0 +1,60 @@
+package cmd
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"sync"
+
+	"github.com/containerd/containerd/runtime/v2/logging"
+	"github.com/coreos/go-systemd/journal"
+	"github.com/spf13/cobra"
+)
+
+func CollectCommand() *cobra.Command {
+	return collectCmd
+}
+
+var collectCmd = &cobra.Command{
+	Use:   "collect",
+	Short: "Collect logs to the journal",
+	RunE:  runCollect,
+}
+
+func runCollect(_ *cobra.Command, _ []string) error {
+	logging.Run(logStdio)
+	return nil
+}
+
+// logStdio copied from
+// https://github.com/containerd/containerd/pull/3085
+// https://github.com/stellarproject/orbit
+func logStdio(ctx context.Context, config *logging.Config, ready func() error) error {
+	// construct any log metadata for the container
+	vars := map[string]string{
+		"SYSLOG_IDENTIFIER": fmt.Sprintf("%s:%s", config.Namespace, config.ID),
+	}
+	var wg sync.WaitGroup
+	wg.Add(2)
+	// forward both stdout and stderr to the journal
+	go copy(&wg, config.Stdout, journal.PriInfo, vars)
+	go copy(&wg, config.Stderr, journal.PriErr, vars)
+	// signal that we are ready and setup for the container to be started
+	if err := ready(); err != nil {
+		return err
+	}
+	wg.Wait()
+	return nil
+}
+
+func copy(wg *sync.WaitGroup, r io.Reader, pri journal.Priority, vars map[string]string) {
+	defer wg.Done()
+	s := bufio.NewScanner(r)
+	for s.Scan() {
+		if s.Err() != nil {
+			return
+		}
+		journal.Send(s.Text(), pri, vars)
+	}
+}

cmd/root.go

@@ -15,6 +15,11 @@ func init() {
 	rootCommand.AddCommand(upCmd)
 	rootCommand.AddCommand(installCmd)
 	rootCommand.AddCommand(providerCmd)
+	rootCommand.AddCommand(collectCmd)
+}
+
+func RootCommand() *cobra.Command {
+	return rootCommand
 }
 
 var (

docs/DEV.md

@@ -1,5 +1,7 @@
 ## Manual installation of faasd for development
 
+> Note: if you're just wanting to try out faasd, then it's likely that you're on the wrong page. This is a detailed set of instructions for those wanting to contribute or customise faasd. Feel free to go back to the homepage and pick a tutorial instead.
+
 ### Pre-reqs
 
 * Linux
@@ -30,44 +32,49 @@ curl -sLSf https://github.com/containerd/containerd/releases/download/v$VER/cont
 containerd -version
 ```
 
-* Or get my containerd binaries for armhf
+* Or get my containerd binaries for Raspberry Pi (armhf)
 
-Building containerd on armhf is extremely slow.
+    Building `containerd` on armhf is extremely slow, so I've provided binaries for you.
 
-```sh
-curl -sSL https://github.com/alexellis/containerd-armhf/releases/download/v1.3.2/containerd.tgz | sudo tar -xvz --strip-components=2 -C /usr/local/bin/
-```
+    ```sh
+    curl -sSL https://github.com/alexellis/containerd-armhf/releases/download/v1.3.2/containerd.tgz | sudo tar -xvz --strip-components=2 -C /usr/local/bin/
+    ```
 
 * Or clone / build / install [containerd](https://github.com/containerd/containerd) from source:
 
-```sh
-export GOPATH=$HOME/go/
-mkdir -p $GOPATH/src/github.com/containerd
-cd $GOPATH/src/github.com/containerd
-git clone https://github.com/containerd/containerd
-cd containerd
-git fetch origin --tags
-git checkout v1.3.2
+    ```sh
+    export GOPATH=$HOME/go/
+    mkdir -p $GOPATH/src/github.com/containerd
+    cd $GOPATH/src/github.com/containerd
+    git clone https://github.com/containerd/containerd
+    cd containerd
+    git fetch origin --tags
+    git checkout v1.3.2
 
-make
-sudo make install
+    make
+    sudo make install
 
-containerd --version
-```
+    containerd --version
+    ```
 
-Kill any old containerd version:
+#### Ensure containerd is running
 
 ```sh
-# Kill any old version
-sudo killall containerd
-sudo systemctl disable containerd
+curl -sLS https://raw.githubusercontent.com/containerd/containerd/master/containerd.service > /tmp/containerd.service
+
+sudo cp /tmp/containerd.service /lib/systemd/system/
+sudo systemctl enable containerd
+
+sudo systemctl daemon-reload
+sudo systemctl restart containerd
 ```
 
-Start containerd in a new terminal:
+Or run ad-hoc:
 
 ```sh
 sudo containerd &
 ```
+
 #### Enable forwarding
 
 > This is required to allow containers in containerd to access the Internet via your computer's primary network interface.
@@ -90,10 +97,11 @@ echo "net.ipv4.conf.all.forwarding=1" | sudo tee -a /etc/sysctl.conf
 sudo apt update \
   && sudo apt install -qy \
     runc \
-    bridge-utils
+    bridge-utils \
+    make
 ```
 
-You may find alternatives for CentOS and other distributions.
+You may find alternative package names for CentOS and other Linux distributions.
 
 #### Install Go 1.13 (x86_64)
 
@@ -109,6 +117,13 @@ export PATH=$PATH:/usr/local/go/bin/
 go version
 ```
 
+You should also add the following to `~/.bash_profile`:
+
+```sh
+export GOPATH=$HOME/go/
+export PATH=$PATH:/usr/local/go/bin/
+```
+
 #### Or on Raspberry Pi (armhf)
 
 ```sh
@@ -139,17 +154,20 @@ sudo mkdir -p /opt/cni/bin
 curl -sSL https://github.com/containernetworking/plugins/releases/download/${CNI_VERSION}/cni-plugins-linux-${ARCH}-${CNI_VERSION}.tgz | sudo tar -xz -C /opt/cni/bin
 ```
 
-Run or install faasd, which brings up the gateway and Prometheus as containers
+#### Clone faasd and its systemd unit files
+
+```sh
+mkdir -p $GOPATH/src/github.com/openfaas/
+cd $GOPATH/src/github.com/openfaas/
+git clone https://github.com/openfaas/faasd
+```
+
+#### Build `faasd` from source (optional)
 
 ```sh
 cd $GOPATH/src/github.com/openfaas/faasd
-go build
-
-# Install with systemd
-# sudo ./faasd install
-
-# Or run interactively
-# sudo ./faasd up
+cd faasd
+make local
 ```
 
 #### Build and run `faasd` (binaries)
@@ -171,6 +189,42 @@ sudo curl -fSLs "https://github.com/openfaas/faasd/releases/download/0.7.4/faasd
     && sudo chmod a+x "/usr/local/bin/faasd"
 ```
 
+#### Install `faasd`
+
+```sh
+# Install with systemd
+sudo cp bin/faasd /usr/local/bin
+sudo faasd install
+
+2020/02/17 17:38:06 Writing to: "/var/lib/faasd/secrets/basic-auth-password"
+2020/02/17 17:38:06 Writing to: "/var/lib/faasd/secrets/basic-auth-user"
+Login with:
+  sudo cat /var/lib/faasd/secrets/basic-auth-password | faas-cli login -s
+```
+
+You can now log in either from this machine or a remote machine using the OpenFaaS UI, or CLI.
+
+Check that faasd is ready:
+
+```
+sudo journalctl -u faasd
+```
+
+You should see output like:
+
+```
+Feb 17 17:46:35 gold-survive faasd[4140]: 2020/02/17 17:46:35 Starting faasd proxy on 8080
+Feb 17 17:46:35 gold-survive faasd[4140]: Gateway: 10.62.0.5:8080
+Feb 17 17:46:35 gold-survive faasd[4140]: 2020/02/17 17:46:35 [proxy] Wait for done
+Feb 17 17:46:35 gold-survive faasd[4140]: 2020/02/17 17:46:35 [proxy] Begin listen on 8080
+```
+
+To get the CLI for the command above run:
+
+```sh
+curl -sSLf https://cli.openfaas.com | sudo sh
+```
+
 #### At run-time
 
 Look in `hosts` in the current working folder or in `/var/lib/faasd/` to get the IP for the gateway or Prometheus

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/openfaas/faasd/cmd"
@@ -15,6 +16,21 @@ var (
 )
 
 func main() {
+
+	if _, ok := os.LookupEnv("CONTAINER_ID"); ok {
+		collect := cmd.RootCommand()
+		collect.SetArgs([]string{"collect"})
+		collect.SilenceUsage = true
+		collect.SilenceErrors = true
+
+		err := collect.Execute()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, err.Error())
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+
 	if err := cmd.Execute(Version, GitCommit); err != nil {
 		os.Exit(1)
 	}

pkg/provider/handlers/deploy.go

@@ -107,6 +107,7 @@ func deploy(ctx context.Context, req types.FunctionDeployment, client *container
 			oci.WithCapabilities([]string{"CAP_NET_RAW"}),
 			oci.WithMounts(mounts),
 			oci.WithEnv(envs)),
+		containerd.WithContainerLabels(*req.Labels),
 	)
 
 	if err != nil {
@@ -120,7 +121,10 @@ func deploy(ctx context.Context, req types.FunctionDeployment, client *container
 func createTask(ctx context.Context, client *containerd.Client, container containerd.Container, cni gocni.CNI) error {
 
 	name := container.ID()
-	task, taskErr := container.NewTask(ctx, cio.NewCreator(cio.WithStdio))
+	// task, taskErr := container.NewTask(ctx, cio.NewCreator(cio.WithStdio))
+
+	task, taskErr := container.NewTask(ctx, cio.BinaryIO("/usr/local/bin/faasd", nil))
+
 	if taskErr != nil {
 		return fmt.Errorf("unable to start task: %s, error: %s", name, taskErr)
 	}

pkg/provider/handlers/functions.go

@@ -3,10 +3,11 @@ package handlers
 import (
 	"context"
 	"fmt"
+	"log"
 
-	"github.com/openfaas/faasd/pkg/cninetwork"
 	"github.com/containerd/containerd"
 	"github.com/containerd/containerd/namespaces"
+	"github.com/openfaas/faasd/pkg/cninetwork"
 )
 
 type Function struct {
@@ -16,6 +17,7 @@ type Function struct {
 	pid       uint32
 	replicas  int
 	IP        string
+	labels    map[string]string
 }
 
 const (
@@ -44,10 +46,18 @@ func GetFunction(client *containerd.Client, name string) (Function, error) {
 	if err == nil {
 
 		image, _ := c.Image(ctx)
+
+		containerName := c.ID()
+		labels, labelErr := c.Labels(ctx)
+		if labelErr != nil {
+			log.Printf("cannot list container %s labels: %s", containerName, labelErr.Error())
+		}
+
 		f := Function{
-			name:      c.ID(),
+			name:      containerName,
 			namespace: FunctionNamespace,
 			image:     image.Name(),
+			labels:    labels,
 		}
 
 		replicas := 0

pkg/provider/handlers/read.go

@@ -26,6 +26,7 @@ func MakeReadHandler(client *containerd.Client) func(w http.ResponseWriter, r *h
 				Image:     function.image,
 				Replicas:  uint64(function.replicas),
 				Namespace: function.namespace,
+				Labels:    &function.labels,
 			})
 		}
 

vendor/github.com/containerd/containerd/runtime/v2/logging/logging.go

@@ -0,0 +1,77 @@
+// +build !windows
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package logging
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+
+	"golang.org/x/sys/unix"
+)
+
+// Config of the container logs
+type Config struct {
+	ID        string
+	Namespace string
+	Stdout    io.Reader
+	Stderr    io.Reader
+}
+
+// LoggerFunc is implemented by custom v2 logging binaries
+type LoggerFunc func(context.Context, *Config, func() error) error
+
+// Run the logging driver
+func Run(fn LoggerFunc) {
+	ctx, cancel := context.WithCancel(context.Background())
+	config := &Config{
+		ID:        os.Getenv("CONTAINER_ID"),
+		Namespace: os.Getenv("CONTAINER_NAMESPACE"),
+		Stdout:    os.NewFile(3, "CONTAINER_STDOUT"),
+		Stderr:    os.NewFile(4, "CONTAINER_STDERR"),
+	}
+	var (
+		s     = make(chan os.Signal, 32)
+		errCh = make(chan error, 1)
+		wait  = os.NewFile(5, "CONTAINER_WAIT")
+	)
+	signal.Notify(s, unix.SIGTERM)
+
+	go func() {
+		if err := fn(ctx, config, wait.Close); err != nil {
+			errCh <- err
+		}
+		errCh <- nil
+	}()
+
+	for {
+		select {
+		case <-s:
+			cancel()
+		case err := <-errCh:
+			if err != nil {
+				fmt.Fprintln(os.Stderr, err)
+				os.Exit(1)
+			}
+			os.Exit(0)
+		}
+	}
+}

vendor/github.com/coreos/go-systemd/LICENSE

@@ -0,0 +1,191 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+"License" shall mean the terms and conditions for use, reproduction, and
+distribution as defined by Sections 1 through 9 of this document.
+
+"Licensor" shall mean the copyright owner or entity authorized by the copyright
+owner that is granting the License.
+
+"Legal Entity" shall mean the union of the acting entity and all other entities
+that control, are controlled by, or are under common control with that entity.
+For the purposes of this definition, "control" means (i) the power, direct or
+indirect, to cause the direction or management of such entity, whether by
+contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
+outstanding shares, or (iii) beneficial ownership of such entity.
+
+"You" (or "Your") shall mean an individual or Legal Entity exercising
+permissions granted by this License.
+
+"Source" form shall mean the preferred form for making modifications, including
+but not limited to software source code, documentation source, and configuration
+files.
+
+"Object" form shall mean any form resulting from mechanical transformation or
+translation of a Source form, including but not limited to compiled object code,
+generated documentation, and conversions to other media types.
+
+"Work" shall mean the work of authorship, whether in Source or Object form, made
+available under the License, as indicated by a copyright notice that is included
+in or attached to the work (an example is provided in the Appendix below).
+
+"Derivative Works" shall mean any work, whether in Source or Object form, that
+is based on (or derived from) the Work and for which the editorial revisions,
+annotations, elaborations, or other modifications represent, as a whole, an
+original work of authorship. For the purposes of this License, Derivative Works
+shall not include works that remain separable from, or merely link (or bind by
+name) to the interfaces of, the Work and Derivative Works thereof.
+
+"Contribution" shall mean any work of authorship, including the original version
+of the Work and any modifications or additions to that Work or Derivative Works
+thereof, that is intentionally submitted to Licensor for inclusion in the Work
+by the copyright owner or by an individual or Legal Entity authorized to submit
+on behalf of the copyright owner. For the purposes of this definition,
+"submitted" means any form of electronic, verbal, or written communication sent
+to the Licensor or its representatives, including but not limited to
+communication on electronic mailing lists, source code control systems, and
+issue tracking systems that are managed by, or on behalf of, the Licensor for
+the purpose of discussing and improving the Work, but excluding communication
+that is conspicuously marked or otherwise designated in writing by the copyright
+owner as "Not a Contribution."
+
+"Contributor" shall mean Licensor and any individual or Legal Entity on behalf
+of whom a Contribution has been received by Licensor and subsequently
+incorporated within the Work.
+
+2. Grant of Copyright License.
+
+Subject to the terms and conditions of this License, each Contributor hereby
+grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
+irrevocable copyright license to reproduce, prepare Derivative Works of,
+publicly display, publicly perform, sublicense, and distribute the Work and such
+Derivative Works in Source or Object form.
+
+3. Grant of Patent License.
+
+Subject to the terms and conditions of this License, each Contributor hereby
+grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
+irrevocable (except as stated in this section) patent license to make, have
+made, use, offer to sell, sell, import, and otherwise transfer the Work, where
+such license applies only to those patent claims licensable by such Contributor
+that are necessarily infringed by their Contribution(s) alone or by combination
+of their Contribution(s) with the Work to which such Contribution(s) was
+submitted. If You institute patent litigation against any entity (including a
+cross-claim or counterclaim in a lawsuit) alleging that the Work or a
+Contribution incorporated within the Work constitutes direct or contributory
+patent infringement, then any patent licenses granted to You under this License
+for that Work shall terminate as of the date such litigation is filed.
+
+4. Redistribution.
+
+You may reproduce and distribute copies of the Work or Derivative Works thereof
+in any medium, with or without modifications, and in Source or Object form,
+provided that You meet the following conditions:
+
+You must give any other recipients of the Work or Derivative Works a copy of
+this License; and
+You must cause any modified files to carry prominent notices stating that You
+changed the files; and
+You must retain, in the Source form of any Derivative Works that You distribute,
+all copyright, patent, trademark, and attribution notices from the Source form
+of the Work, excluding those notices that do not pertain to any part of the
+Derivative Works; and
+If the Work includes a "NOTICE" text file as part of its distribution, then any
+Derivative Works that You distribute must include a readable copy of the
+attribution notices contained within such NOTICE file, excluding those notices
+that do not pertain to any part of the Derivative Works, in at least one of the
+following places: within a NOTICE text file distributed as part of the
+Derivative Works; within the Source form or documentation, if provided along
+with the Derivative Works; or, within a display generated by the Derivative
+Works, if and wherever such third-party notices normally appear. The contents of
+the NOTICE file are for informational purposes only and do not modify the
+License. You may add Your own attribution notices within Derivative Works that
+You distribute, alongside or as an addendum to the NOTICE text from the Work,
+provided that such additional attribution notices cannot be construed as
+modifying the License.
+You may add Your own copyright statement to Your modifications and may provide
+additional or different license terms and conditions for use, reproduction, or
+distribution of Your modifications, or for any such Derivative Works as a whole,
+provided Your use, reproduction, and distribution of the Work otherwise complies
+with the conditions stated in this License.
+
+5. Submission of Contributions.
+
+Unless You explicitly state otherwise, any Contribution intentionally submitted
+for inclusion in the Work by You to the Licensor shall be under the terms and
+conditions of this License, without any additional terms or conditions.
+Notwithstanding the above, nothing herein shall supersede or modify the terms of
+any separate license agreement you may have executed with Licensor regarding
+such Contributions.
+
+6. Trademarks.
+
+This License does not grant permission to use the trade names, trademarks,
+service marks, or product names of the Licensor, except as required for
+reasonable and customary use in describing the origin of the Work and
+reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty.
+
+Unless required by applicable law or agreed to in writing, Licensor provides the
+Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
+including, without limitation, any warranties or conditions of TITLE,
+NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
+solely responsible for determining the appropriateness of using or
+redistributing the Work and assume any risks associated with Your exercise of
+permissions under this License.
+
+8. Limitation of Liability.
+
+In no event and under no legal theory, whether in tort (including negligence),
+contract, or otherwise, unless required by applicable law (such as deliberate
+and grossly negligent acts) or agreed to in writing, shall any Contributor be
+liable to You for damages, including any direct, indirect, special, incidental,
+or consequential damages of any character arising as a result of this License or
+out of the use or inability to use the Work (including but not limited to
+damages for loss of goodwill, work stoppage, computer failure or malfunction, or
+any and all other commercial damages or losses), even if such Contributor has
+been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability.
+
+While redistributing the Work or Derivative Works thereof, You may choose to
+offer, and charge a fee for, acceptance of support, warranty, indemnity, or
+other liability obligations and/or rights consistent with this License. However,
+in accepting such obligations, You may act only on Your own behalf and on Your
+sole responsibility, not on behalf of any other Contributor, and only if You
+agree to indemnify, defend, and hold each Contributor harmless for any liability
+incurred by, or claims asserted against, such Contributor by reason of your
+accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work
+
+To apply the Apache License to your work, attach the following boilerplate
+notice, with the fields enclosed by brackets "[]" replaced with your own
+identifying information. (Don't include the brackets!) The text should be
+enclosed in the appropriate comment syntax for the file format. We also
+recommend that a file or class name and description of purpose be included on
+the same "printed page" as the copyright notice for easier identification within
+third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/coreos/go-systemd/NOTICE

@@ -0,0 +1,5 @@
+CoreOS Project
+Copyright 2018 CoreOS, Inc
+
+This product includes software developed at CoreOS, Inc.
+(http://www.coreos.com/).

vendor/github.com/coreos/go-systemd/journal/journal.go

@@ -0,0 +1,225 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package journal provides write bindings to the local systemd journal.
+// It is implemented in pure Go and connects to the journal directly over its
+// unix socket.
+//
+// To read from the journal, see the "sdjournal" package, which wraps the
+// sd-journal a C API.
+//
+// http://www.freedesktop.org/software/systemd/man/systemd-journald.service.html
+package journal
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"unsafe"
+)
+
+// Priority of a journal message
+type Priority int
+
+const (
+	PriEmerg Priority = iota
+	PriAlert
+	PriCrit
+	PriErr
+	PriWarning
+	PriNotice
+	PriInfo
+	PriDebug
+)
+
+var (
+	// This can be overridden at build-time:
+	// https://github.com/golang/go/wiki/GcToolchainTricks#including-build-information-in-the-executable
+	journalSocket = "/run/systemd/journal/socket"
+
+	// unixConnPtr atomically holds the local unconnected Unix-domain socket.
+	// Concrete safe pointer type: *net.UnixConn
+	unixConnPtr unsafe.Pointer
+	// onceConn ensures that unixConnPtr is initialized exactly once.
+	onceConn sync.Once
+)
+
+func init() {
+	onceConn.Do(initConn)
+}
+
+// Enabled checks whether the local systemd journal is available for logging.
+func Enabled() bool {
+	onceConn.Do(initConn)
+
+	if (*net.UnixConn)(atomic.LoadPointer(&unixConnPtr)) == nil {
+		return false
+	}
+
+	if _, err := net.Dial("unixgram", journalSocket); err != nil {
+		return false
+	}
+
+	return true
+}
+
+// Send a message to the local systemd journal. vars is a map of journald
+// fields to values.  Fields must be composed of uppercase letters, numbers,
+// and underscores, but must not start with an underscore. Within these
+// restrictions, any arbitrary field name may be used.  Some names have special
+// significance: see the journalctl documentation
+// (http://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html)
+// for more details.  vars may be nil.
+func Send(message string, priority Priority, vars map[string]string) error {
+	conn := (*net.UnixConn)(atomic.LoadPointer(&unixConnPtr))
+	if conn == nil {
+		return errors.New("could not initialize socket to journald")
+	}
+
+	socketAddr := &net.UnixAddr{
+		Name: journalSocket,
+		Net:  "unixgram",
+	}
+
+	data := new(bytes.Buffer)
+	appendVariable(data, "PRIORITY", strconv.Itoa(int(priority)))
+	appendVariable(data, "MESSAGE", message)
+	for k, v := range vars {
+		appendVariable(data, k, v)
+	}
+
+	_, _, err := conn.WriteMsgUnix(data.Bytes(), nil, socketAddr)
+	if err == nil {
+		return nil
+	}
+	if !isSocketSpaceError(err) {
+		return err
+	}
+
+	// Large log entry, send it via tempfile and ancillary-fd.
+	file, err := tempFd()
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	_, err = io.Copy(file, data)
+	if err != nil {
+		return err
+	}
+	rights := syscall.UnixRights(int(file.Fd()))
+	_, _, err = conn.WriteMsgUnix([]byte{}, rights, socketAddr)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Print prints a message to the local systemd journal using Send().
+func Print(priority Priority, format string, a ...interface{}) error {
+	return Send(fmt.Sprintf(format, a...), priority, nil)
+}
+
+func appendVariable(w io.Writer, name, value string) {
+	if err := validVarName(name); err != nil {
+		fmt.Fprintf(os.Stderr, "variable name %s contains invalid character, ignoring\n", name)
+	}
+	if strings.ContainsRune(value, '\n') {
+		/* When the value contains a newline, we write:
+		 * - the variable name, followed by a newline
+		 * - the size (in 64bit little endian format)
+		 * - the data, followed by a newline
+		 */
+		fmt.Fprintln(w, name)
+		binary.Write(w, binary.LittleEndian, uint64(len(value)))
+		fmt.Fprintln(w, value)
+	} else {
+		/* just write the variable and value all on one line */
+		fmt.Fprintf(w, "%s=%s\n", name, value)
+	}
+}
+
+// validVarName validates a variable name to make sure journald will accept it.
+// The variable name must be in uppercase and consist only of characters,
+// numbers and underscores, and may not begin with an underscore:
+// https://www.freedesktop.org/software/systemd/man/sd_journal_print.html
+func validVarName(name string) error {
+	if name == "" {
+		return errors.New("Empty variable name")
+	} else if name[0] == '_' {
+		return errors.New("Variable name begins with an underscore")
+	}
+
+	for _, c := range name {
+		if !(('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_') {
+			return errors.New("Variable name contains invalid characters")
+		}
+	}
+	return nil
+}
+
+// isSocketSpaceError checks whether the error is signaling
+// an "overlarge message" condition.
+func isSocketSpaceError(err error) bool {
+	opErr, ok := err.(*net.OpError)
+	if !ok || opErr == nil {
+		return false
+	}
+
+	sysErr, ok := opErr.Err.(*os.SyscallError)
+	if !ok || sysErr == nil {
+		return false
+	}
+
+	return sysErr.Err == syscall.EMSGSIZE || sysErr.Err == syscall.ENOBUFS
+}
+
+// tempFd creates a temporary, unlinked file under `/dev/shm`.
+func tempFd() (*os.File, error) {
+	file, err := ioutil.TempFile("/dev/shm/", "journal.XXXXX")
+	if err != nil {
+		return nil, err
+	}
+	err = syscall.Unlink(file.Name())
+	if err != nil {
+		return nil, err
+	}
+	return file, nil
+}
+
+// initConn initializes the global `unixConnPtr` socket.
+// It is meant to be called exactly once, at program startup.
+func initConn() {
+	autobind, err := net.ResolveUnixAddr("unixgram", "")
+	if err != nil {
+		return
+	}
+
+	sock, err := net.ListenUnixgram("unixgram", autobind)
+	if err != nil {
+		return
+	}
+
+	atomic.StorePointer(&unixConnPtr, unsafe.Pointer(sock))
+}