From bd43211284c50419cfe24e0c4157b69d586681cd Mon Sep 17 00:00:00 2001
From: Josh Komoroske <jdkomo@gmail.com>
Date: Thu, 8 Feb 2024 18:44:24 -0500
Subject: [PATCH] feat: run docker login

---
 .golangci.yaml |  4 ++++
 docker/exec.go | 24 ++++++++++++++++++++++++
 main.go        | 22 ++++++++++++++++++++++
 3 files changed, 50 insertions(+)
 create mode 100644 docker/exec.go

diff --git a/.golangci.yaml b/.golangci.yaml
index 0e5d17b..4e0e6ec 100644
--- a/.golangci.yaml
+++ b/.golangci.yaml
@@ -16,6 +16,10 @@ linters:
     - structcheck
     - varcheck
 
+    # Linters that are not used for this project.
+    - wrapcheck
+    - depguard
+
 linters-settings:
   goheader:
     template: |-
diff --git a/docker/exec.go b/docker/exec.go
new file mode 100644
index 0000000..0a8d23a
--- /dev/null
+++ b/docker/exec.go
@@ -0,0 +1,24 @@
+// Copyright Josh Komoroske. All rights reserved.
+// Use of this source code is governed by the MIT license,
+// a copy of which can be found in the LICENSE.txt file.
+// SPDX-License-Identifier: MIT
+
+// Package docker exposes functions for executing specific docker commands.
+package docker
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+// Login executes a docker login to ghcr.io with the given username and
+// password.
+func Login(username, password string) error {
+	cmd := exec.Command("/usr/bin/docker", "login", "ghcr.io", "-u", username, "--password-stdin")
+	cmd.Stdin = strings.NewReader(password + "\n")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	return cmd.Run()
+}
diff --git a/main.go b/main.go
index b0f79d5..67152fa 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,8 @@ package main
 import (
 	"fmt"
 	"os"
+
+	"github.com/joshdk/actions-docker-shim/docker"
 )
 
 func main() {
@@ -18,6 +20,26 @@ func main() {
 	}
 }
 
+//nolint:forbidigo,wsl
 func mainCmd() error {
+	var token string
+	if value := os.Getenv("GITHUB_TOKEN"); value != "" {
+		// Environment variable named "GITHUB_TOKEN".
+		token = value
+	} else if value := os.Getenv("INPUT_GITHUB_TOKEN"); value != "" {
+		// Input named "github-token".
+		token = value
+	} else if value := os.Getenv("INPUT_TOKEN"); value != "" {
+		// Input named "token".
+		token = value
+	}
+
+	fmt.Printf("::group::%s\n", "Docker login")
+	err := docker.Login(os.Getenv("GITHUB_ACTOR"), token)
+	fmt.Println("::endgroup::")
+	if err != nil {
+		return err
+	}
+
 	return nil
 }