refactor(deadcode): unused custom errors

docs: add documentation to core functions and structs

.forgejo/workflows/pull-request.yml

@@ -0,0 +1,41 @@
+name: Pull-Request
+on: [pull_request]
+
+jobs:
+  static-analysis:
+    runs-on: runner-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.23
+      - name: Validate Yaml
+        run: pipx run pre-commit run check-yaml -a
+      - name: Validate shell scripts
+        run: pipx run pre-commit run shellcheck -a
+      - name: Check formatting
+        run: pipx run pre-commit run go-fmt -a
+      - name: Check code patterns
+        run: pipx run pre-commit run go-vet-mod -a
+  tests:
+    runs-on: runner-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.23
+      - name: Tests
+        run: pipx run pre-commit run go-test-mod -a
+  post-run:
+    runs-on: runner-latest
+    needs: [static-analysis,tests]
+    if: ${{ always() }}
+    steps:
+      - name: Export trace
+        uses: https://forge.karnov.club/marc/opentelemetry-trace-export-forgejo-action@main
+        with:
+          otlp-endpoint: "http://otel.home.karnov.club:4318"
+          forgejo-token: ${{ secrets.GITHUB_TOKEN }}
+          forgejo-base-url: ${{ env.GITHUB_SERVER_URL }}
+          run-id: ${{ env.GITHUB_RUN_NUMBER }}
+          repo-name: ${{ env.GITHUB_REPOSITORY }}

.forgejo/workflows/push.yml

@@ -0,0 +1,67 @@
+name: Push
+on:
+  push:
+    branches: [main]
+
+jobs:
+  pre-run:
+    runs-on: runner-latest
+    steps:
+      - uses: https://forge.karnov.club/marc/push-status-to-discord-action@main
+        with:
+          webhook-url: ${{secrets.DISCORD_WEBHOOK_URL}}
+          status: "Started"
+          init: true
+  static-analysis:
+    runs-on: runner-latest
+    needs: [pre-run]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.23
+      - name: Validate Yaml
+        run: pipx run pre-commit run check-yaml -a
+      - name: Validate shell scripts
+        run: pipx run pre-commit run shellcheck -a
+      - name: Check formatting
+        run: pipx run pre-commit run go-fmt -a
+      - name: Check code patterns
+        run: pipx run pre-commit run go-vet-mod -a
+  tests:
+    runs-on: runner-latest
+    needs: [pre-run]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.23
+      - name: Tests
+        run: pipx run pre-commit run go-test-mod -a
+  post-run:
+    runs-on: runner-latest
+    needs: [static-analysis,tests]
+    steps:
+      - name: Export trace
+        uses: https://forge.karnov.club/marc/opentelemetry-trace-export-forgejo-action@main
+        with:
+          otlp-endpoint: "http://otel.home.karnov.club:4318"
+          forgejo-token: ${{ secrets.GITHUB_TOKEN }}
+          forgejo-base-url: ${{ env.GITHUB_SERVER_URL }}
+          run-id: ${{ env.GITHUB_RUN_NUMBER }}
+          repo-name: ${{ env.GITHUB_REPOSITORY }}
+      - name: Notify success
+        uses: https://forge.karnov.club/marc/push-status-to-discord-action@main
+        if: ${{always() && success()}}
+        with:
+          webhook-url: ${{secrets.DISCORD_WEBHOOK_URL}}
+          status: "Success"
+          variant: "success"
+      - name: Notify failure
+        uses: https://forge.karnov.club/marc/push-status-to-discord-action@main
+        if: ${{always() && failure()}}
+        with:
+          webhook-url: ${{secrets.DISCORD_WEBHOOK_URL}}
+          status: "Failure"
+          variant: "failure"
+

.forgejo/workflows/release.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: runner-latest
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5

.pre-commit-config.yaml

@@ -0,0 +1,16 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: check-yaml
+  - repo: https://github.com/shellcheck-py/shellcheck-py
+    rev: v0.10.0.1
+    hooks:
+      - id: shellcheck
+  - repo: https://github.com/tekwizely/pre-commit-golang
+    rev: master
+    hooks:
+      - id: go-test-mod
+      - id: go-fmt
+      - id: go-vet-mod

README.md

@@ -22,3 +22,7 @@ curl https://forge.karnov.club/spadinastan/spud/raw/branch/main/install.sh | bas
 
 To pull a specific version, supply a `$SPUD_VERSION` that corresponds to an existing release tag, and to control where
 the binary is unpacked and installed, supply `$SPUD_ROOT`.
+
+## Development
+
+The `bootstrap.sh` script should be run to prepare any pre-commit hooks and other required tooling for local development. Checks can be run manually via `pipx run pre-commit run -a`.

bootstrap.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+if [[ -z "$(command -v pipx)" ]]; then
+    echo "ERROR: Pre-commit tooling requires pipx to be available."
+    exit 1
+fi
+
+pipx run pre-commit install

cli/build.go

@@ -0,0 +1,51 @@
+package cli
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"log"
+	podman "spud/podman"
+	service_definition "spud/service_definition"
+)
+
+func getBuildCommand() *cobra.Command {
+	build := &cobra.Command{
+		Use:   "build",
+		Short: "Build service images.",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var pathProvided string
+			var fetcher service_definition.DefinitionFetcher
+			var def service_definition.ServiceDefinition
+			var err error
+
+			if pathProvided, err = cmd.PersistentFlags().GetString("definition"); err != nil {
+				return fmt.Errorf("%+v", err)
+			}
+
+			defPathType := service_definition.GetPathType(pathProvided)
+
+			if fetcher, err = service_definition.NewDefinitionFetcher(defPathType); err != nil {
+				return fmt.Errorf("Couldn't set up fetcher from the path provided.")
+			}
+
+			if def, err = fetcher.GetDefinition(pathProvided); err != nil {
+				return fmt.Errorf("Failed to read service definition from file: %+v", err)
+			}
+
+			imagesToBuild := def.Build.Images
+
+			if len(imagesToBuild) == 0 {
+				log.Print("No images defined - nothing to build!")
+			}
+
+			for _, imageDef := range imagesToBuild {
+				podman.Build(imageDef)
+			}
+			return nil
+		},
+	}
+	build.PersistentFlags().StringP("definition", "d", "./service.yml", "Path to the service definition to use.")
+
+	return build
+
+}

cli/build_test.go

@@ -0,0 +1,37 @@
+package cli
+
+import (
+	"github.com/spf13/cobra"
+	"testing"
+)
+
+func TestCliBuildServiceDefinitionPathMustExist(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"build", "-d", "./not-a-file.yml"})
+
+	outcome := cli.Execute()
+
+	if outcome == nil {
+		t.Errorf("Expected error, got nil.")
+	}
+}
+
+func TestCliBuildDefaultsServiceDefinitionPath(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"build"})
+
+	startCommand, _, _ := cli.Find([]string{"build"})
+
+	startCommand.RunE = func(cmd *cobra.Command, args []string) error {
+		actual, _ := cmd.PersistentFlags().GetString("definition")
+		if actual != "./service.yml" {
+			t.Errorf("Unexpected default value for 'definition' / 'd' arg: %s", actual)
+		}
+
+		return nil
+	}
+
+	cli.Execute()
+}

cli/cli.go

@@ -0,0 +1,32 @@
+// Root of the CLI.
+package cli
+
+import (
+	"github.com/spf13/cobra"
+)
+
+// Creates the root of the CLI, with all available commands
+// added to it.
+func GetCli() *cobra.Command {
+	var cli = &cobra.Command{
+		Use:   "spud",
+		Short: "A not-entirely-terrible-way to manage self-hosted services.",
+	}
+
+	allCommands := []*cobra.Command{
+		// cli/start_service.go
+		getStartCommand(),
+		// cli/stop_service.go
+		getStopCommand(),
+		// cli/build.go
+		getBuildCommand(),
+		// cli/daemon.go
+		getDaemonCommand(),
+	}
+
+	for _, command := range allCommands {
+		cli.AddCommand(command)
+	}
+
+	return cli
+}

cli/cli_test.go

@@ -0,0 +1,21 @@
+package cli
+
+import (
+	"testing"
+)
+
+func TestGetCliReturnsNonNil(t *testing.T) {
+	root := GetCli()
+
+	if root == nil {
+		t.Error("Expected to get command pointer, got nil.")
+	}
+}
+
+func TestGetCliReturnsCliRoot(t *testing.T) {
+	root := GetCli()
+
+	if len(root.Commands()) == 0 {
+		t.Error("Expected to find >= 0 commands mapped, found none.")
+	}
+}

cli/daemon.go

@@ -0,0 +1,21 @@
+package cli
+
+import (
+	"github.com/spf13/cobra"
+	daemon "spud/daemon"
+)
+
+func getDaemonCommand() *cobra.Command {
+	startDaemon := &cobra.Command{
+		Use:   "daemon",
+		Short: "Starts a daemon instance.",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			d := daemon.NewDaemon("", 8000, nil)
+
+			d.Start()
+			return nil
+		},
+	}
+
+	return startDaemon
+}

cli/start_service.go

@@ -0,0 +1,82 @@
+// Start services
+//
+// Commands related to starting services.
+
+package cli
+
+import (
+	"context"
+	"fmt"
+	"github.com/spf13/cobra"
+	service "spud/service"
+	service_definition "spud/service_definition"
+	webclient "spud/webclient"
+)
+
+func getStartCommand() *cobra.Command {
+	type ParsedFlags struct {
+		definitionPath string
+		daemonHost     string
+		daemonPort     int
+	}
+	start := &cobra.Command{
+		Use:   "start",
+		Short: "Creates or updates a service based on the provided definition.",
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			var pathProvided, host string
+			var port int
+			var err error
+
+			if pathProvided, err = cmd.PersistentFlags().GetString("definition"); err != nil {
+				return err
+			}
+
+			if host, err = cmd.PersistentFlags().GetString("host"); err != nil {
+				return err
+			}
+
+			if port, err = cmd.PersistentFlags().GetInt("port"); err != nil {
+				return err
+			}
+
+			if host != "" && port == 0 || host == "" && port != 0 {
+				return fmt.Errorf("Invalid flags: host and port must be defined together or not at all.")
+			}
+
+			cmd.SetContext(context.WithValue(cmd.Context(), "flags", ParsedFlags{definitionPath: pathProvided, daemonHost: host, daemonPort: port}))
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			var fetcher service_definition.DefinitionFetcher
+			var def service_definition.ServiceDefinition
+			var err error
+
+			ctx := cmd.Context()
+			flags := ctx.Value("flags").(ParsedFlags)
+
+			defPath := flags.definitionPath
+			defPathType := service_definition.GetPathType(defPath)
+
+			if fetcher, err = service_definition.NewDefinitionFetcher(defPathType); err != nil {
+				return fmt.Errorf("Couldn't set up fetcher from the path provided.")
+			}
+
+			if def, err = fetcher.GetDefinition(defPath); err != nil {
+				return fmt.Errorf("Failed to read service definition: %+v", err)
+			}
+
+			if flags.daemonHost != "" && flags.daemonPort != 0 {
+				webclient.NewWebClient(flags.daemonHost, flags.daemonPort).CreateService(def)
+				return nil
+			}
+
+			return service.NewPodmanServiceManager().Create(def)
+		},
+	}
+
+	start.PersistentFlags().StringP("definition", "d", "./service.yml", "Path to the service definition to use.")
+	start.PersistentFlags().StringP("host", "H", "", "If specified, host where the daemon lives.")
+	start.PersistentFlags().IntP("port", "p", 0, "Port on the daemon host.")
+
+	return start
+}

cli/start_service_test.go

@@ -0,0 +1,71 @@
+package cli
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"testing"
+)
+
+func Test_StartServiceCli_StartServiceDefinitionPathMustExist(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"start", "-d", "./not-a-file.yml"})
+
+	outcome := cli.Execute()
+
+	if outcome == nil {
+		t.Errorf("Expected error, got nil.")
+	}
+}
+
+func Test_StartServiceCli_StartDefaultsServiceDefinitionPath(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"start"})
+
+	startCommand, _, _ := cli.Find([]string{"start"})
+
+	startCommand.RunE = func(cmd *cobra.Command, args []string) error {
+		actual, _ := cmd.PersistentFlags().GetString("definition")
+		if actual != "./service.yml" {
+			t.Errorf("Unexpected default value for 'definition' / 'd' arg: %s", actual)
+		}
+
+		return nil
+	}
+
+	cli.Execute()
+}
+
+func Test_StartServiceCli_ErrorIfHostAndPortNotProvidedTogether(t *testing.T) {
+	inputs := [][]string{
+		{"start", "-H", "host"},
+		{"start", "-p", "9999"},
+	}
+
+	for _, input := range inputs {
+		t.Run(fmt.Sprintf("%+v", input), func(t *testing.T) {
+			cli := GetCli()
+			cli.SetArgs(input)
+
+			startCommand, _, _ := cli.Find([]string{"start"})
+
+			previousPreRun := startCommand.PersistentPreRunE
+
+			startCommand.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
+				if err := previousPreRun(cmd, args); err == nil {
+					t.Errorf("Expected error, got nil.")
+				}
+
+				return nil
+			}
+
+			startCommand.RunE = func(cmd *cobra.Command, args []string) error {
+				return nil
+			}
+
+			cli.Execute()
+		})
+
+	}
+}

cli/stop_service.go

@@ -0,0 +1,66 @@
+// Stopping services
+//
+// Commands related to stopping services.
+package cli
+
+import (
+	"context"
+	"fmt"
+	"github.com/spf13/cobra"
+	service "spud/service"
+	webclient "spud/webclient"
+)
+
+func getStopCommand() *cobra.Command {
+	type ParsedFlags struct {
+		serviceName string
+		daemonHost  string
+		daemonPort  int
+	}
+	stop := &cobra.Command{
+		Use:   "stop [service-name]",
+		Short: "Stops a running service and all of its containers.",
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			var serviceName, host string
+			var port int
+			var err error
+
+			if host, err = cmd.PersistentFlags().GetString("host"); err != nil {
+				return err
+			}
+
+			if port, err = cmd.PersistentFlags().GetInt("port"); err != nil {
+				return err
+			}
+
+			if host != "" && port == 0 || host == "" && port != 0 {
+				return fmt.Errorf("Invalid flags: host and port must be defined together or not at all.")
+			}
+
+			if len(args) == 0 {
+				return fmt.Errorf("Must provide a service name.")
+			}
+
+			serviceName = args[0]
+
+			cmd.SetContext(context.WithValue(cmd.Context(), "flags", ParsedFlags{serviceName: serviceName, daemonHost: host, daemonPort: port}))
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			flags := cmd.Context().Value("flags").(ParsedFlags)
+
+			if flags.daemonHost != "" && flags.daemonPort != 0 {
+				webclient.NewWebClient(flags.daemonHost, flags.daemonPort).StopService(flags.serviceName)
+				return nil
+
+			}
+
+			return service.NewPodmanServiceManager().Stop(flags.serviceName)
+		},
+	}
+
+	stop.PersistentFlags().StringP("host", "H", "", "If specified, host where the daemon lives.")
+	stop.PersistentFlags().IntP("port", "p", 0, "Port on the daemon host.")
+
+	return stop
+}

cli/stop_service_test.go

@@ -0,0 +1,52 @@
+package cli
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"testing"
+)
+
+func Test_StopServiceCli_StopRequiresAServiceName(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"stop"})
+
+	outcome := cli.Execute()
+
+	if outcome == nil {
+		t.Error("Expected error, got nil.")
+	}
+}
+
+func Test_StopServiceCli_ErrorIfHostAndPortNotProvidedTogether(t *testing.T) {
+	inputs := [][]string{
+		{"stop", "-H", "host"},
+		{"stop", "-p", "9999"},
+	}
+
+	for _, input := range inputs {
+		t.Run(fmt.Sprintf("%+v", input), func(t *testing.T) {
+			cli := GetCli()
+			cli.SetArgs(input)
+
+			stopCommand, _, _ := cli.Find([]string{"stop"})
+
+			previousPreRun := stopCommand.PersistentPreRunE
+
+			stopCommand.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
+				if err := previousPreRun(cmd, args); err == nil {
+					t.Errorf("Expected error, got nil.")
+				}
+
+				return nil
+			}
+
+			stopCommand.RunE = func(cmd *cobra.Command, args []string) error {
+				return nil
+			}
+
+			cli.Execute()
+		})
+
+	}
+}

daemon/api.go

@@ -0,0 +1,59 @@
+package daemon
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	service "spud/service"
+	service_definition "spud/service_definition"
+)
+
+func GetApiRoutes() map[string]HandlerFuncWithContext {
+	return map[string]HandlerFuncWithContext{
+		"/service/":               ServiceList,
+		"/service/{serviceName}/": ServiceDetails,
+	}
+}
+
+type ServiceListPayload struct {
+	Definition service_definition.ServiceDefinition `json:"definition"`
+}
+
+func handleServiceListPost(w http.ResponseWriter, r *http.Request, c context.Context) {
+	client := c.Value("client").(service.ServiceClient)
+	var p ServiceListPayload
+	json.NewDecoder(r.Body).Decode(&p)
+	client.Create(p.Definition)
+	w.WriteHeader(201)
+	json.NewEncoder(w).Encode(p.Definition)
+}
+
+func handleServiceDetailDelete(w http.ResponseWriter, r *http.Request, c context.Context) {
+	client := c.Value("client").(service.ServiceClient)
+	serviceName := r.PathValue("serviceName")
+	client.Stop(serviceName)
+
+	w.WriteHeader(204)
+}
+
+func handleNotImplemented(w http.ResponseWriter) {
+	w.WriteHeader(501)
+}
+
+func ServiceList(w http.ResponseWriter, r *http.Request, c context.Context) {
+	switch r.Method {
+	case http.MethodPost:
+		handleServiceListPost(w, r, c)
+	default:
+		handleNotImplemented(w)
+	}
+}
+
+func ServiceDetails(w http.ResponseWriter, r *http.Request, c context.Context) {
+	switch r.Method {
+	case http.MethodDelete:
+		handleServiceDetailDelete(w, r, c)
+	default:
+		handleNotImplemented(w)
+	}
+}

daemon/api_test.go

@@ -0,0 +1,100 @@
+package daemon
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	service_definition "spud/service_definition"
+	"testing"
+)
+
+type MockClient struct {
+	calls struct {
+		Create []service_definition.ServiceDefinition
+		Stop   []string
+	}
+}
+
+func (c *MockClient) Create(s service_definition.ServiceDefinition) error {
+	c.calls.Create = append(c.calls.Create, s)
+	return nil
+}
+
+func (c *MockClient) Stop(n string) error {
+	c.calls.Stop = append(c.calls.Stop, n)
+	return nil
+}
+
+func TestServiceListPostCreatesService(t *testing.T) {
+	mockClient := &MockClient{}
+	daemonContext := context.WithValue(context.Background(), "client", mockClient)
+	req := httptest.NewRequest(http.MethodPost, "/service/", nil)
+	resp := httptest.NewRecorder()
+
+	ServiceList(resp, req, daemonContext)
+
+	response := resp.Result()
+
+	if response.StatusCode != 201 {
+		t.Errorf("Expected status 201, got %d", response.StatusCode)
+	}
+
+	if len(mockClient.calls.Create) != 1 {
+		t.Error("Expected a call to Create")
+	}
+}
+
+func TestServiceListUnsupportedMethods(t *testing.T) {
+	for _, method := range []string{http.MethodGet, http.MethodPut, http.MethodHead, http.MethodDelete} {
+		t.Run(method, func(t *testing.T) {
+			req := httptest.NewRequest(method, "/service/", nil)
+			resp := httptest.NewRecorder()
+
+			ServiceList(resp, req, context.Background())
+
+			response := resp.Result()
+
+			if response.StatusCode != 501 {
+				t.Errorf("Expected status 501, got %d.", response.StatusCode)
+			}
+		})
+	}
+
+}
+
+func TestServiceDetailsDeleteStopsService(t *testing.T) {
+	mockClient := &MockClient{}
+	daemonContext := context.WithValue(context.Background(), "client", mockClient)
+	req := httptest.NewRequest(http.MethodDelete, "/service/service-name/", nil)
+	resp := httptest.NewRecorder()
+
+	ServiceDetails(resp, req, daemonContext)
+
+	response := resp.Result()
+
+	if response.StatusCode != 204 {
+		t.Errorf("Expected status 204, got %d", response.StatusCode)
+	}
+
+	if len(mockClient.calls.Stop) != 1 {
+		t.Error("Expected a call to Stop")
+	}
+}
+
+func TestServiceDetailUnsupportedMethods(t *testing.T) {
+	for _, method := range []string{http.MethodGet, http.MethodPost, http.MethodPut, http.MethodHead} {
+		t.Run(method, func(t *testing.T) {
+			req := httptest.NewRequest(method, "/service/service-name/", nil)
+			resp := httptest.NewRecorder()
+
+			ServiceDetails(resp, req, context.Background())
+
+			response := resp.Result()
+
+			if response.StatusCode != 501 {
+				t.Errorf("Expected status 501, got %d.", response.StatusCode)
+			}
+		})
+	}
+
+}

daemon/daemon.go

@@ -0,0 +1,71 @@
+package daemon
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"net/http"
+	service "spud/service"
+	"strconv"
+)
+
+type Daemon struct {
+	Host     string
+	Port     int
+	Services service.ServiceClient
+	Routes   map[string]http.HandlerFunc
+}
+
+type HandlerFuncWithContext = func(w http.ResponseWriter, r *http.Request, c context.Context)
+
+type RecordingResponseWriter struct {
+	responseWriter http.ResponseWriter
+
+	StatusCode int
+}
+
+func (r *RecordingResponseWriter) WriteHeader(statusCode int) {
+	r.StatusCode = statusCode
+	r.responseWriter.WriteHeader(statusCode)
+}
+
+func (r RecordingResponseWriter) Write(b []byte) (int, error) {
+	return r.responseWriter.Write(b)
+}
+
+func (r RecordingResponseWriter) Header() http.Header {
+	return r.responseWriter.Header()
+}
+
+func handleFuncWithContext(h HandlerFuncWithContext, c context.Context) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		respWriter := &RecordingResponseWriter{responseWriter: w}
+		h(respWriter, r, c)
+		slog.Info("Request", "Method", r.Method, "Path", r.URL.Path, "Status", strconv.Itoa(respWriter.StatusCode))
+	}
+}
+
+func NewDaemon(host string, port int, serviceClient service.ServiceClient) *Daemon {
+	d := &Daemon{Host: host, Port: port}
+
+	if serviceClient == nil {
+		d.Services = service.NewPodmanServiceManager()
+	} else {
+		d.Services = serviceClient
+	}
+
+	return d
+}
+
+func (d Daemon) GetListenAddress() string {
+	return fmt.Sprintf("%s:%d", d.Host, d.Port)
+}
+
+func (d Daemon) Start() {
+	daemonContext := context.WithValue(context.Background(), "client", d.Services)
+	for route, handler := range GetApiRoutes() {
+		http.HandleFunc(route, handleFuncWithContext(handler, daemonContext))
+	}
+
+	http.ListenAndServe(d.GetListenAddress(), nil)
+}

daemon/daemon_test.go

@@ -0,0 +1,31 @@
+package daemon
+
+import (
+	"reflect"
+	service "spud/service"
+	service_definition "spud/service_definition"
+	"testing"
+)
+
+type DummyClient struct{}
+
+func (c DummyClient) Create(d service_definition.ServiceDefinition) error { return nil }
+func (c DummyClient) Stop(d string) error                                 { return nil }
+
+func TestDaemonDefaultsToPodmanClient(t *testing.T) {
+	d := NewDaemon("host", 0, nil)
+
+	clientType := reflect.TypeOf(d.Services).String()
+	if clientType != reflect.TypeOf(service.NewPodmanServiceManager()).String() {
+		t.Errorf("Expected podman client, got %s instead.", clientType)
+	}
+}
+
+func TestDaemonUsesInjectedClientIfProvided(t *testing.T) {
+	d := NewDaemon("host", 0, DummyClient{})
+
+	clientType := reflect.TypeOf(d.Services).String()
+	if clientType != reflect.TypeOf(DummyClient{}).String() {
+		t.Errorf("Expected dummy client, got %s instead.", clientType)
+	}
+}

git/main.go

@@ -0,0 +1,26 @@
+// Git wrapper
+//
+// Facilitates the usage of `git` commands when dealing with
+// data living in repositories.
+
+package git
+
+import (
+	"os/exec"
+)
+
+type GitClient interface {
+	Clone(path string, destination string) (string, error)
+}
+
+type Git struct{}
+
+func (g Git) Clone(path string, destination string) (string, error) {
+	cloneCmd := exec.Command("git", "clone", path, destination)
+
+	if err := cloneCmd.Run(); err != nil {
+		return "", err
+	}
+
+	return path, nil
+}

go.mod

@@ -1,6 +1,6 @@
 module spud
 
-go 1.22.2
+go 1.23.1
 
 require (
 	github.com/goccy/go-yaml v1.11.3

main.go

@@ -1,45 +1,12 @@
 package main
 
 import (
-	"github.com/spf13/cobra"
-	"log"
-
-	service "spud/service"
-	service_definition "spud/service_definition"
+	"os"
+	cli "spud/cli"
 )
 
-var cli = &cobra.Command{
-	Use:   "spud",
-	Short: "A not-entirely-terrible-way to manage self-hosted services.",
-}
-
-var start = &cobra.Command{
-	Use:   "start",
-	Short: "Creates or updates a service based on the provided definition.",
-	Run: func(cmd *cobra.Command, args []string) {
-		pathProvided := args[0]
-		def, err := service_definition.GetServiceDefinitionFromFile(pathProvided)
-
-		if err != nil {
-			log.Fatal(err)
-		}
-
-		service.CreateService(def)
-	},
-}
-
-var stop = &cobra.Command{
-	Use:   "stop",
-	Short: "Stops a running service and all of its containers.",
-	Run: func(cmd *cobra.Command, args []string) {
-		serviceName := args[0]
-		service.StopService(serviceName)
-	},
-}
-
 func main() {
-	cli.AddCommand(start)
-	cli.AddCommand(stop)
-
-	cli.Execute()
+	if err := cli.GetCli().Execute(); err != nil {
+		os.Exit(1)
+	}
 }

podman/main.go

@@ -3,8 +3,8 @@ package podman
 
 import (
 	"log"
+	"os"
 	"os/exec"
-
 	service_definition "spud/service_definition"
 )
 
@@ -41,7 +41,12 @@ func CreatePod(name string, ports []service_definition.PortMapping) error {
 	args := []string{"pod", "create", "--replace"}
 
 	for _, portMapping := range ports {
-		portArgs := []string{"-p", portMapping.Host + ":" + portMapping.Container}
+		portMapStr := portMapping.Host + ":" + portMapping.Container
+
+		if portMapping.Type != "" {
+			portMapStr = portMapStr + "/" + portMapping.Type
+		}
+		portArgs := []string{"-p", portMapStr}
 		args = append(args, portArgs...)
 	}
 
@@ -91,6 +96,14 @@ func CreateContainer(definition service_definition.ContainerDefinition, knownVol
 		"--replace",
 	}
 
+	if definition.Network != "" {
+		args = append(args, []string{"--network", definition.Network}...)
+	}
+
+	if definition.PIDNamespace != "" {
+		args = append(args, []string{"--pid", definition.PIDNamespace}...)
+	}
+
 	if definition.EnvFile != "" {
 		args = append(args, []string{"--env-file", definition.EnvFile}...)
 	}
@@ -141,3 +154,19 @@ func CreateContainer(definition service_definition.ContainerDefinition, knownVol
 
 	return nil
 }
+
+// Builds a container image.
+func Build(imageDefinition service_definition.BuildImage) error {
+	args := []string{"build", "-f", imageDefinition.Path, "-t", imageDefinition.TagPrefix}
+
+	command := exec.Command("podman", args...)
+
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+
+	if err := command.Run(); err != nil {
+		return err
+	}
+
+	return nil
+}

service/client.go

@@ -0,0 +1,10 @@
+package service
+
+import (
+	service_definition "spud/service_definition"
+)
+
+type ServiceClient interface {
+	Create(service_definition.ServiceDefinition) error
+	Stop(string) error
+}

service/service.go

@@ -1,19 +1,28 @@
 package service
 
 import (
-	"log"
-
 	podman "spud/podman"
 	service_definition "spud/service_definition"
 )
 
-func CreateService(definition service_definition.ServiceDefinition) {
+type ServiceManager interface {
+	Create(definition service_definition.ServiceDefinition)
+	Stop(name string)
+}
+
+type PodmanServiceManager struct{}
+
+func NewPodmanServiceManager() *PodmanServiceManager {
+	return &PodmanServiceManager{}
+}
+
+func (c PodmanServiceManager) Create(definition service_definition.ServiceDefinition) error {
 	var err error
 
 	err = podman.CreatePod(definition.Name, definition.Ports)
 
 	if err != nil {
-		log.Fatalf("%s", err)
+		return err
 	}
 
 	knownVolumes := map[string]string{}
@@ -26,9 +35,11 @@ func CreateService(definition service_definition.ServiceDefinition) {
 
 	for _, container := range definition.Containers {
 		if err = podman.CreateContainer(container, knownVolumes, definition.Name); err != nil {
-			log.Fatalf("%s", err)
+			return err
 		}
 	}
+
+	return nil
 }
 
 /*
@@ -36,10 +47,6 @@ func CreateService(definition service_definition.ServiceDefinition) {
  *
  * The service and all its containers are stopped but not deleted.
  */
-func StopService(name string) {
-	err := podman.StopPod(name)
-
-	if err != nil {
-		log.Fatalf("%s", err)
-	}
+func (c PodmanServiceManager) Stop(name string) error {
+	return podman.StopPod(name)
 }

service_definition/errors.go

@@ -1,24 +0,0 @@
-package service_definition
-
-type FileDoesNotExistError struct {
-	Message      string
-	ExpectedPath string
-}
-
-func (r *FileDoesNotExistError) Error() string {
-	prefix := "File not found"
-
-	if r.Message != "" {
-		prefix = r.Message
-	}
-
-	return prefix + ": " + r.ExpectedPath
-}
-
-type InvalidServiceDefinitionError struct {
-	Path string
-}
-
-func (r *InvalidServiceDefinitionError) Error() string {
-	return "Service definition does not satisfy expected schema: " + r.Path
-}

service_definition/fetcher.go

@@ -0,0 +1,26 @@
+// Definition fetcher
+//
+// Handles fetching and building ServiceDefinition structs from different
+// data sources.
+
+package service_definition
+
+import (
+	"fmt"
+)
+
+type DefinitionFetcher interface {
+	GetDefinition(path string) (ServiceDefinition, error)
+}
+
+func NewDefinitionFetcher(fetcher_type string) (DefinitionFetcher, error) {
+	if fetcher_type == "git" {
+		return NewGitDefinitionFetcher(), nil
+	}
+
+	if fetcher_type == "file" {
+		return NewFileDefinitionFetcher(), nil
+	}
+
+	return nil, fmt.Errorf("Unrecognized fetcher type: %s", fetcher_type)
+}

service_definition/fetcher_test.go

@@ -0,0 +1,19 @@
+package service_definition
+
+import (
+	"testing"
+)
+
+func TestGetPathTypeDetectsGitPathPrefix(t *testing.T) {
+	actual := GetPathType("git+https://test.com")
+	if actual != "git" {
+		t.Errorf("Expected 'git' type, got %s", actual)
+	}
+}
+
+func TestGetPathTypeDetectsFileNoPrefix(t *testing.T) {
+	actual := GetPathType("file/path.yml")
+	if actual != "file" {
+		t.Errorf("Expected 'file' type, got %s", actual)
+	}
+}

service_definition/file_definition_fetcher.go

@@ -0,0 +1,34 @@
+// File Definition fetcher
+//
+// Handles extracting service definitions from local files.
+
+package service_definition
+
+import (
+	"fmt"
+	"github.com/goccy/go-yaml"
+	"os"
+)
+
+type FileDefinitionFetcher struct{}
+
+func NewFileDefinitionFetcher() *FileDefinitionFetcher {
+	return &FileDefinitionFetcher{}
+}
+
+// Retrieves a service definition from the given filepath.
+func (f FileDefinitionFetcher) GetDefinition(path string) (ServiceDefinition, error) {
+	var definition ServiceDefinition
+
+	defData, err := os.ReadFile(path)
+
+	if err != nil {
+		return ServiceDefinition{}, fmt.Errorf("Could not find service configuration file: %s", path)
+	}
+
+	if err = yaml.Unmarshal(defData, &definition); err != nil {
+		return ServiceDefinition{}, fmt.Errorf("Service definition does not satisfy expected schema: %s", path)
+	}
+
+	return definition, nil
+}

service_definition/git_fetcher.go

@@ -0,0 +1,38 @@
+// Git Definition fetcher
+//
+// Handles fetching and building ServiceDefinition structs from git
+// repositories.
+
+package service_definition
+
+import (
+	"os"
+	git "spud/git"
+	"strings"
+)
+
+type GitDefinitionFetcher struct {
+	Git git.GitClient
+}
+
+func NewGitDefinitionFetcher() *GitDefinitionFetcher {
+	return &GitDefinitionFetcher{
+		Git: git.Git{},
+	}
+}
+
+// Clones the target git repository and uses it as a basis to extract
+// a service definition.
+func (f GitDefinitionFetcher) GetDefinition(path string) (ServiceDefinition, error) {
+	dir, err := os.MkdirTemp("/tmp", "spud-service-")
+
+	if err != nil {
+		return ServiceDefinition{}, err
+	}
+
+	if _, err := f.Git.Clone(strings.TrimPrefix(path, "git+"), dir); err != nil {
+		return ServiceDefinition{}, err
+	}
+
+	return NewFileDefinitionFetcher().GetDefinition((dir + "/service.yml"))
+}

service_definition/git_fetcher_test.go

@@ -0,0 +1,34 @@
+package service_definition
+
+import (
+	"strings"
+	"testing"
+)
+
+type MockGit struct {
+	calls []string
+}
+
+func (g *MockGit) Clone(path string, destination string) (string, error) {
+	g.calls = append(g.calls, path+":"+destination)
+
+	return path, nil
+}
+
+func TestGetDefinitionGetDefinitionFromGit(t *testing.T) {
+	var gitFetcher GitDefinitionFetcher
+
+	fetcher, _ := NewDefinitionFetcher("git")
+
+	gitFetcher, _ = fetcher.(GitDefinitionFetcher)
+
+	mockGit := MockGit{}
+	gitFetcher.Git = &mockGit
+
+	mockUrl := "https://git.com/owner/repo.git"
+	gitFetcher.GetDefinition("git+" + mockUrl)
+
+	if !strings.HasPrefix(mockGit.calls[0], mockUrl) {
+		t.Errorf("Expected git cloning for %s, got %s instead.", mockUrl, mockGit.calls[0])
+	}
+}

service_definition/main.go

@@ -1,10 +1,13 @@
 package service_definition
 
-import (
-	"os"
+type BuildImage struct {
+	Path      string `yaml:"path"`
+	TagPrefix string `yaml:"tag"`
+}
 
-	"github.com/goccy/go-yaml"
-)
+type BuildConfiguration struct {
+	Images []BuildImage
+}
 
 type VolumeDefinition struct {
 	Name string `yaml:"name"`
@@ -28,28 +31,15 @@ type ContainerDefinition struct {
 	Image        string                `yaml:"image"`
 	Volumes      []VolumeConfiguration `yaml:"volumes"`
 	EnvFile      string                `yaml:"env-file"`
+	Network      string                `yaml:"network"`
+	PIDNamespace string                `yaml:"pid-namespace"`
 	ExtraArgs    []string              `yaml:"extra-args"`
 }
 
 type ServiceDefinition struct {
 	Name       string                `yaml:"name"`
+	Build      BuildConfiguration    `yaml:"build"`
 	Volumes    []VolumeDefinition    `yaml:"volumes"`
 	Containers []ContainerDefinition `yaml:"containers"`
 	Ports      []PortMapping         `yaml:"ports"`
 }
-
-func GetServiceDefinitionFromFile(path string) (ServiceDefinition, error) {
-	var definition ServiceDefinition
-
-	defData, err := os.ReadFile(path)
-
-	if err != nil {
-		return ServiceDefinition{}, &FileDoesNotExistError{Message: "Could not find service configuration file", ExpectedPath: path}
-	}
-
-	if err = yaml.Unmarshal(defData, &definition); err != nil {
-		return ServiceDefinition{}, &InvalidServiceDefinitionError{Path: path}
-	}
-
-	return definition, nil
-}

service_definition/paths.go

@@ -0,0 +1,13 @@
+package service_definition
+
+import (
+	"strings"
+)
+
+func GetPathType(path string) string {
+	if strings.HasPrefix(path, "git+") {
+		return "git"
+	}
+
+	return "file"
+}

service_definition/service_definition_test.go

@@ -5,7 +5,8 @@ import (
 )
 
 func TestGetServiceDefinitionFromFileDoesNotExist(t *testing.T) {
-	_, err := GetServiceDefinitionFromFile(t.TempDir() + "/not-a-file.yml")
+	fetcher, _ := NewDefinitionFetcher("file")
+	_, err := fetcher.GetDefinition(t.TempDir() + "/not-a-file.yml")
 
 	if err == nil {
 		t.Errorf("Expected error, got nil.")

webclient/client_test.go

@@ -0,0 +1,91 @@
+package webclient
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	daemon "spud/daemon"
+	service_definition "spud/service_definition"
+	"testing"
+)
+
+type RecordedRequest struct {
+	method      string
+	url         string
+	contentType string
+	data        io.Reader
+}
+
+type DummyHttpClient struct {
+	requests []RecordedRequest
+}
+
+func (d *DummyHttpClient) Do(request *http.Request) (*http.Response, error) {
+	d.requests = append(d.requests, RecordedRequest{method: request.Method, url: request.URL.String(), contentType: "", data: request.Body})
+	return nil, nil
+}
+
+func Test_WebClient_GetBaseUrlGetsUrlFromHostPort(t *testing.T) {
+	c := NewWebClient("http://host", 9999)
+
+	actual := c.getBaseUrl()
+	expected := "http://host:9999"
+	if actual != expected {
+		t.Errorf("Expected %s, got %s.", expected, actual)
+	}
+}
+
+func Test_WebClient_CreateServicePostsToDaemon(t *testing.T) {
+	c := NewWebClient("http://host", 9999)
+	httpClient := &DummyHttpClient{}
+	c.httpClient = httpClient
+
+	def := service_definition.ServiceDefinition{Name: "test-service"}
+
+	c.CreateService(def)
+
+	if len(httpClient.requests) != 1 || httpClient.requests[0].method != http.MethodPost {
+		t.Errorf("Expected one POST requests, got none.")
+	}
+}
+
+func Test_WebClient_CreateServiceSendsDefinition(t *testing.T) {
+	c := NewWebClient("http://host", 9999)
+	httpClient := &DummyHttpClient{}
+	c.httpClient = httpClient
+
+	payload := daemon.ServiceListPayload{
+		Definition: service_definition.ServiceDefinition{Name: "test-service"},
+	}
+
+	c.CreateService(payload.Definition)
+
+	req := httpClient.requests[0]
+
+	actualDef := bytes.NewBuffer([]byte{})
+	actualDef.ReadFrom(req.data)
+	expectedDef, _ := json.Marshal(payload)
+
+	if actualDef.String() != string(expectedDef) {
+		t.Errorf("Unexpected data: %s != %s", actualDef.String(), string(expectedDef))
+	}
+}
+
+func Test_WebClient_StopServiceDeletesToDaemon(t *testing.T) {
+	c := NewWebClient("http://host", 9999)
+	httpClient := &DummyHttpClient{}
+	c.httpClient = httpClient
+
+	serviceName := "test-service"
+	c.StopService(serviceName)
+
+	if len(httpClient.requests) != 1 || httpClient.requests[0].method != http.MethodDelete {
+		t.Errorf("Expected one DELETE request, got none.")
+	}
+
+	expected := c.getBaseUrl() + "/service/" + serviceName + "/"
+	if httpClient.requests[0].url != expected {
+		t.Errorf("Expected url to be %s, got %s.", expected, httpClient.requests[0].url)
+	}
+}

webclient/main.go

@@ -0,0 +1,52 @@
+package webclient
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	daemon "spud/daemon"
+	service_definition "spud/service_definition"
+)
+
+type HttpClient interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+type WebClient struct {
+	httpClient HttpClient
+	Host       string
+	Port       int
+}
+
+func NewWebClient(host string, port int) *WebClient {
+	return &WebClient{
+		httpClient: &http.Client{},
+		Host:       host,
+		Port:       port,
+	}
+}
+
+func (c WebClient) getBaseUrl() string {
+	return fmt.Sprintf("%s:%d", c.Host, c.Port)
+}
+
+func (c WebClient) CreateService(def service_definition.ServiceDefinition) error {
+	payload := daemon.ServiceListPayload{
+		Definition: def,
+	}
+
+	serializedPayload, _ := json.Marshal(payload)
+
+	req, _ := http.NewRequest(http.MethodPost, c.getBaseUrl()+"/service/", bytes.NewBuffer(serializedPayload))
+	_, e := c.httpClient.Do(req)
+
+	return e
+}
+
+func (c WebClient) StopService(name string) error {
+	req, _ := http.NewRequest(http.MethodDelete, c.getBaseUrl()+"/service/"+name+"/", nil)
+	_, e := c.httpClient.Do(req)
+
+	return e
+}