Initial version of the push to Dokku action

action.yaml

@@ -0,0 +1,14 @@
+name: 'Push to Dokku'
+description: 'Pushes a repository to a remote Dokku host'
+runs:
+  using: 'go'
+  main: 'main.go'
+inputs:
+  host:
+    description: 'Remote hostname'
+    required: true
+  app:
+    description: 'App name'
+    required: true
+  private-key:
+    description: 'Private SSH key to connect to remote host'

config.go

@@ -0,0 +1,17 @@
+package main
+
+import "os"
+
+type config struct {
+	HostName   string
+	AppName    string
+	PrivateKey string
+}
+
+func readConfig() config {
+	return config{
+		HostName:   os.Getenv("host"),
+		AppName:    os.Getenv("app"),
+		PrivateKey: os.Getenv("private-key"),
+	}
+}

go.mod

@@ -0,0 +1,10 @@
+module lmika.dev/actions/push-to-dokku
+
+go 1.22.4
+
+require (
+	github.com/bitfield/script v0.22.1 // indirect
+	github.com/itchyny/gojq v0.12.13 // indirect
+	github.com/itchyny/timefmt-go v0.1.5 // indirect
+	mvdan.cc/sh/v3 v3.7.0 // indirect
+)

go.sum

@@ -0,0 +1,8 @@
+github.com/bitfield/script v0.22.1 h1:DphxoC5ssYciwd0ZS+N0Xae46geAD/0mVWh6a2NUxM4=
+github.com/bitfield/script v0.22.1/go.mod h1:fv+6x4OzVsRs6qAlc7wiGq8fq1b5orhtQdtW0dwjUHI=
+github.com/itchyny/gojq v0.12.13 h1:IxyYlHYIlspQHHTE0f3cJF0NKDMfajxViuhBLnHd/QU=
+github.com/itchyny/gojq v0.12.13/go.mod h1:JzwzAqenfhrPUuwbmEz3nu3JQmFLlQTQMUcOdnu/Sf4=
+github.com/itchyny/timefmt-go v0.1.5 h1:G0INE2la8S6ru/ZI5JecgyzbbJNs5lG1RcBqa7Jm6GE=
+github.com/itchyny/timefmt-go v0.1.5/go.mod h1:nEP7L+2YmAbT2kZ2HfSs1d8Xtw9LY8D2stDBckWakZ8=
+mvdan.cc/sh/v3 v3.7.0 h1:lSTjdP/1xsddtaKfGg7Myu7DnlHItd3/M2tomOcNNBg=
+mvdan.cc/sh/v3 v3.7.0/go.mod h1:K2gwkaesF/D7av7Kxl0HbF5kGOd2ArupNTX3X44+8l8=

main.go

@@ -0,0 +1,22 @@
+package main
+
+import "log"
+
+func main() {
+	cfg := readConfig()
+	log.Println("Reading config")
+
+	svc := NewServices(cfg)
+
+	if err := svc.AddPrivateKey(); err != nil {
+		log.Fatal(err)
+	}
+
+	if err := svc.ConfigureSSH(); err != nil {
+		log.Fatal(err)
+	}
+
+	if err := svc.PushRepository(); err != nil {
+		log.Fatal(err)
+	}
+}

services.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/bitfield/script"
+	"log"
+	"os"
+	"text/template"
+)
+
+type Services struct {
+	cfg config
+}
+
+func NewServices(cfg config) *Services {
+	return &Services{cfg: cfg}
+}
+
+func (s *Services) AddPrivateKey() error {
+	log.Println("Adding private key")
+
+	if err := script.Exec(`mkdir -p $HOME/.ssh`).Error(); err != nil {
+		return err
+	}
+
+	if err := script.Exec(`chmod 700 $HOME/.ssh`).Error(); err != nil {
+		return err
+	}
+
+	_, err := script.Echo(s.cfg.PrivateKey).WriteFile(os.ExpandEnv(`${HOME}/.ssh/id_rsa`))
+	if err != nil {
+		return err
+	}
+
+	if err := script.Exec(`chmod -R 400 $HOME/.ssh/.`).Error(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *Services) ConfigureSSH() error {
+	log.Println("Configuring SSH")
+
+	var bfr bytes.Buffer
+	if err := sshConfigTemplate.Execute(&bfr, struct {
+		Cfg  config
+		Home string
+	}{
+		Cfg:  s.cfg,
+		Home: os.Getenv("HOME"),
+	}); err != nil {
+		return err
+	}
+
+	if _, err := script.Echo(bfr.String()).WriteFile(os.ExpandEnv(`${HOME}/.ssh/config`)); err != nil {
+		return err
+	}
+	if err := script.Exec(`chmod 400 $HOME/.ssh/config`).Error(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *Services) PushRepository() error {
+	sshUrl := fmt.Sprintf(`dokku@%v`, s.cfg.HostName)
+	remoteUrl := fmt.Sprintf(`ssh://%v:22/%v`, sshUrl, s.cfg.AppName)
+
+	log.Println("Testing Dokku SSH connection")
+	if err := script.Exec(fmt.Sprintf(`ssh %v version`, sshUrl)).Error(); err != nil {
+		return err
+	}
+
+	log.Println("SSH connection good. Pushing repository")
+	if err := script.Exec(fmt.Sprintf(`git remote add dokku '%v'`, remoteUrl)).Error(); err != nil {
+		return err
+	}
+
+	if err := script.Exec(`git push dokku main`).Error(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+var (
+	sshConfigTemplate = template.Must(template.New("ssh-config").Parse(`
+Host *
+  StrictHostKeyChecking no
+
+Host {{.Cfg.Host}}
+  HostName {{.Cfg.Host}}
+  User dokku
+  IdentityFile {{.Home}}/.ssh/id_rsa
+`))
+)