From d76ca9ec81086e486a50a4aa03126271a3e520de Mon Sep 17 00:00:00 2001
From: a73x <dev@a73x.sh>
Date: Sun, 25 Aug 2024 13:21:16 +0100
Subject: now with a go bashscript

and hooks
---
 Dockerfile |  19 +++++++--
 README     |   1 +
 README.md  |   1 -
 go.mod     |   3 ++
 main.go    | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 161 insertions(+), 4 deletions(-)
 create mode 100644 README
 delete mode 100644 README.md
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/Dockerfile b/Dockerfile
index b8039db..5dca0e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,15 @@
+FROM golang:1.23.0-alpine3.20
+
+WORKDIR /usr/src/app
+
+# COPY go.mod go.sum ./
+COPY go.mod .
+RUN go mod download && go mod verify
+
+COPY . .
+
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /usr/local/bin/app .
+
 FROM alpine:latest
 
 # Install necessary packages
@@ -35,13 +47,14 @@ RUN echo "PasswordAuthentication no" >> /etc/ssh/sshd_config
 
 # Set MOTD
 
-run echo "Connection successful!" > /etc/motd
+RUN echo "Connection successful!" > /etc/motd
 
 # Expose SSH port
 EXPOSE 22
 
-COPY git-wrapper.sh /usr/local/bin/git-wrapper 
-RUN chmod +x /usr/local/bin/git-wrapper
+COPY --from=0 /usr/local/bin/app /usr/local/bin/git-wrapper 
+# COPY git-wrapper.sh /usr/local/bin/git-wrapper 
+# RUN chmod +x /usr/local/bin/git-wrapper
 
 # Copy the entrypoint script
 COPY entrypoint.sh /entrypoint.sh
diff --git a/README b/README
new file mode 100644
index 0000000..7a07164
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+self hosted git server with a cgit ui
diff --git a/README.md b/README.md
deleted file mode 100644
index 7a07164..0000000
--- a/README.md
+++ /dev/null
@@ -1 +0,0 @@
-self hosted git server with a cgit ui
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..f109fad
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.sr.ht/~a73x/git
+
+go 1.23.0
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..4902f8b
--- /dev/null
+++ b/main.go
@@ -0,0 +1,141 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"syscall"
+)
+
+var logger *log.Logger
+var logf *os.File
+
+func main() {
+	var err error
+	logf, err = os.OpenFile("loggy.boi",
+		os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	defer logf.Close()
+
+	logger = log.New(logf, "", log.LstdFlags)
+	sshOriginalCommand := os.Getenv("SSH_ORIGINAL_COMMAND")
+	if sshOriginalCommand == "" {
+		log.Fatal("SSH_ORIGINAL_COMMAND is not set")
+	}
+
+	if err := Run(sshOriginalCommand); err != nil {
+		logger.Fatal(err)
+	}
+}
+
+type Mkdir func([]string) error
+
+func mkdir(path string) error {
+	return os.MkdirAll(path, 0755)
+}
+
+func Run(sshCmd string) error {
+	parts := strings.Split(sshCmd, " ")
+	if len(parts) != 2 {
+		return fmt.Errorf("expected 2 args: %s", sshCmd)
+	}
+
+	command := parts[0]
+	repo := parts[1]
+
+	remmappedRepo := RemapRepoPath(repo, "repos")
+	// creates repos if they don't exist
+	if _, err := os.Stat(remmappedRepo); os.IsNotExist(err) {
+		if err := setupRepo(remmappedRepo); err != nil {
+			return fmt.Errorf("failed to setup repo: %v", err)
+		}
+	}
+
+	bin, err := exec.LookPath(command)
+	if err != nil {
+		return fmt.Errorf("failed to lookup %s:%v", command, err)
+	}
+
+	// Execute the git-shell command
+	return syscall.Exec(bin, []string{command, remmappedRepo}, os.Environ())
+}
+
+func setupRepo(repo string) error {
+	// Create the directory (and any necessary parent directories)
+	if err := mkdir(repo); err != nil {
+		return fmt.Errorf("failed to create directory: %v", err)
+	}
+
+	cmd := exec.Command("git", "init", "--bare", "--initial-branch=main", repo)
+	cmd.Stdout = logf
+	cmd.Stderr = logf
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("failed to run initialize git repository: %v", err)
+	}
+
+	if err := writeDescriptionHook(repo); err != nil {
+		logger.Printf("failed to create description hook: %v\n", err)
+	}
+
+	return nil
+}
+
+// 'a73x/cgit.git' => repos/a73x/cgit.git
+func RemapRepoPath(repo string, path string) string {
+	return filepath.Join(path, strings.Trim(repo, "'"))
+}
+
+var descriptionHook = `#!/bin/bash
+
+BRANCH="main"
+FILE=README
+while read oldrev newrev ref
+do
+        # only checking out the master (or whatever branch you would like to deploy)
+        if [ "$ref" = "refs/heads/$BRANCH" ];
+        then
+				changed=$(git ls-tree $REV $FILE)
+				if [ -n $changed ]; then
+                	echo "Ref $ref received. updating description"
+                	git show HEAD:README | head -n1 > description
+				fi
+        else
+                echo "Ref $ref received. Doing nothing: only the ${BRANCH} branch may be deployed on this server."
+        fi
+done`
+
+func writeDescriptionHook(path string) error {
+	hooksDir := filepath.Join(path, "hooks")
+	scriptPath := filepath.Join(hooksDir, "post-receive")
+	err := os.MkdirAll(hooksDir, 0755)
+	if err != nil {
+		return fmt.Errorf("error creating hooks directory: %v", err)
+	}
+
+	file, err := os.Create(scriptPath)
+	if err != nil {
+		return fmt.Errorf("error creating post-receive file: %v", err)
+	}
+
+	defer file.Close()
+
+	// Write the script to the file
+	_, err = file.WriteString(descriptionHook)
+	if err != nil {
+		return fmt.Errorf("error writing script to file: %v", err)
+	}
+
+	// Set the file permissions to be executable
+	err = os.Chmod(scriptPath, 0755)
+	if err != nil {
+		return fmt.Errorf("error setting file permissions: %v", err)
+	}
+
+	return nil
+}
-- 
cgit v1.2.3