From 077a42c1c2b90243adb741cfab9382f081717a9a Mon Sep 17 00:00:00 2001
From: yalefresne <yann.lefresne@mylittleparis.com>
Date: Thu, 27 Mar 2025 10:47:41 +0100
Subject: [PATCH] Feat: Add docker action to build parent image

---
 commands/docker.go | 115 +++++++++++++++++++++++++++++++++++++++++++++
 commands/root.go   |  28 +++++++++--
 2 files changed, 138 insertions(+), 5 deletions(-)
 create mode 100644 commands/docker.go

diff --git a/commands/docker.go b/commands/docker.go
new file mode 100644
index 0000000..4e11342
--- /dev/null
+++ b/commands/docker.go
@@ -0,0 +1,115 @@
+package cmd
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/MyLittleParis/dvopsctl/utils"
+)
+
+const dockerfile = "Dockerfile"
+const defaultRegistry = "ghcr.io/mylittleparis"
+const defaultGithub = "https://github.com/MyLittleParis" 
+const defaultRepositoryName = "devops-docker-php"
+
+var defaultRegistryRepo = fmt.Sprintf("%s/%s", defaultRegistry, defaultRepositoryName)
+var defaultRepository = fmt.Sprintf("%s/%s", defaultGithub, defaultRepositoryName)
+var defaultPath = []string {"./", ".docker/"}
+
+func BuildParentImage(path string) (int, error) {
+    errCode := 0 
+    var err error
+   
+    dockerImage, tag := searchInDockerfile(path)
+
+    if dockerImage == "" {
+        log.Printf("No docker image found.")
+        return 1, errors.New("No Docker image found.")
+    }
+
+    err = os.Chdir("../" + defaultRepositoryName)
+
+    if err != nil {
+        err = os.Chdir("../")
+        utils.GitClone(defaultRepository)    
+        err = os.Chdir(defaultRepositoryName)
+    } else {
+        utils.GitPull()
+    }
+    utils.GitCheckout(dockerImage)
+    Build(fmt.Sprintf("%s/%s:%s",defaultRegistryRepo, dockerImage, tag))
+
+    return errCode, err
+}
+
+func searchInDockerfile(path string) (dockerImage, tag string) {
+    paths := defaultPath
+    if path != "" {
+        paths = []string{path}
+    }
+
+    for _, path := range paths {
+        fmt.Println("Search in " + path + dockerfile)
+        if content, err := os.Open(path + dockerfile); err == nil {
+            scanner := bufio.NewScanner(content)
+            for scanner.Scan() {
+                dockerImage, tag = extractImageName(scanner.Text())
+                if dockerImage != "" {
+                    fmt.Printf("Image found %s\n", dockerImage)
+                    return dockerImage, tag
+                }
+            }
+        }
+    }
+
+    return dockerImage, tag
+}
+
+/*
+    Extract image name if is a ghcr.io/mylittleparis image
+    From:
+    FROM ghcr.io/mylittleparis/devops-docker-php/php7.4-fpm-alpine:latest AS prod
+    To:
+    php7.4-fpm-alpine:latest
+*/
+func extractImageName(line string) (dockerImage, tag string) {
+    if dockerImage, found := strings.CutPrefix(line, "FROM " + defaultRegistry + "/" + defaultRepositoryName + "/"); found { 
+        if found {fmt.Printf("Parent Image found %s\n", dockerImage)}
+        if removeAs, _, found := strings.Cut(dockerImage, " AS "); found {
+            if found {fmt.Printf("Image found %s\n", removeAs)}
+            dockerImage, tag, _ = strings.Cut(removeAs, ":")
+            return dockerImage, tag
+        }
+    }
+    return dockerImage, tag
+}
+
+func Build(tag string)  {
+    dockerBuild := exec.Command("docker", "build", "-t", tag, ".")
+    fmt.Printf("Docker build %s", tag)
+    pipe, _ := dockerBuild.StdoutPipe()
+
+    err := dockerBuild.Start()
+
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    reader := bufio.NewReader(pipe)
+    line, err := reader.ReadString('\n')
+    for err == nil {
+        fmt.Println(line)
+        line, err = reader.ReadString('\n')
+    }
+
+    err = dockerBuild.Wait()
+
+    if err != nil {
+        log.Printf("Command finished with error: %v", err)
+    }
+}
diff --git a/commands/root.go b/commands/root.go
index 3f5e51d..e45b9f9 100644
--- a/commands/root.go
+++ b/commands/root.go
@@ -23,9 +23,22 @@ func Run(args []string) (int, error) {
         fmt.Println("")
     }
 
+    dockerCmd := flag.NewFlagSet("docker", flag.ExitOnError)
+    // subcommands
+    dockerBuild := dockerCmd.Bool("build", false, "Build parent docker image in local")
+    // args
+    dockerPath := dockerCmd.String("path", "", "Path to docker file")
+
+    dockerCmd.Usage = func() {
+        fmt.Println("docker [options]")
+        dockerCmd.PrintDefaults()
+        fmt.Println("")
+    }
+
     // Commands list to use it in usage function
     commands := []*flag.FlagSet{
-            serverCmd,
+        dockerCmd,
+        serverCmd,
     }
 
     var usage func()
@@ -49,10 +62,15 @@ func Run(args []string) (int, error) {
         if *serverOpen {
             errCode, rootError = ServerOpen()
         }
-        default: 
-            fmt.Println("Unknown command: " + args[1])
-            usage()
-            return -1, errors.New(unknownCmd)
+    case "docker":
+        dockerCmd.Parse(args[2:])
+        if *dockerBuild {
+            BuildParentImage(*dockerPath)
+        }
+    default:
+        fmt.Println("Unknown command: " + args[1])
+        usage()
+        return -1, errors.New(unknownCmd)
     }
     
     return errCode, rootError