container-compose/main.go at main · dgodd/container-compose · GitHub

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package main

import (

"bufio"

"bytes"

"encoding/json"

"fmt"

"io"

"log"

"os"

"os/exec"

"path/filepath"

"regexp"

"strings"

"gopkg.in/yaml.v3"

)

// Version is set at build time via ldflags (e.g. -ldflags="-X main.Version=1.0.0").

// When built without ldflags it reports "dev".

var Version = "dev"

type Config struct {

Name string `yaml:"name"`

Services map[string]*Service `yaml:"services"`

}

type Service struct {

Name string `yaml:"-"`

Image string `yaml:"image"`

Platform string `yaml:"platform"`

Ports []string `yaml:"ports"`

Workdir string `yaml:"working_dir"`

Environment Environment `yaml:"environment"`

Command StringOrStringList `yaml:"command"`

Entrypoint string `yaml:"entrypoint"`

DependsOn []string `yaml:"depends_on"`

Volumes []string `yaml:"volumes"`

Profiles []string `yaml:"profiles"`

Restart string `yaml:"restart"`

Deploy struct {

Resources struct {

Limits struct {

Memory string `yaml:"memory"`

} `yaml:"limits"`

} `yaml:"resources"`

} `yaml:"deploy"`

}

func getConfig(path string) (*Config, error) {

// Load the base compose file into a generic map

baseMap, err := loadYAMLToMap(path)

if err != nil {

return nil, err

}

// Check for an override file and deep-merge if present

override := overridePath(path)

if override != "" {

overrideMap, err := loadYAMLToMap(override)

if err == nil {

log.Printf("Using override file %s\n", override)

baseMap = deepMerge(baseMap, overrideMap).(map[string]interface{})

}

// Decode the merged map into Config

merged, err := yaml.Marshal(baseMap)

if err != nil {

return nil, err

}

var config Config

if err := yaml.Unmarshal(merged, &config); err != nil {

return nil, err

}

if config.Name == "" {

dir, err := os.Getwd()

if err != nil {

return nil, err

}

dir = filepath.Base(dir)

config.Name = dir

}

for name, service := range config.Services {

service.Name = config.Name + "-" + name

}

return &config, nil

}

// loadYAMLToMap decodes a YAML file into a generic map[string]interface{}.

func loadYAMLToMap(path string) (map[string]interface{}, error) {

fh, err := os.Open(path)

if err != nil {

return nil, err

}

defer fh.Close()

var m map[string]interface{}

if err := yaml.NewDecoder(fh).Decode(&m); err != nil {

return nil, err

}

return m, nil

}

// overridePath returns the path to an override file if one exists alongside the base file.

// It checks both known filenames and both .yml / .yaml extensions:

// <base-stem>.override<ext>

// where ext is first the base extension, then the alternate (.yml ↔ .yaml)

// and for the alternate compose stem as well.

// Returns "" when no override file is found.

func overridePath(base string) string {

ext := filepath.Ext(base)

stem := strings.TrimSuffix(base, ext)

altExt := alternateYAMLExt(ext)

altStem := alternateComposeStem(stem)

candidates := []string{

stem + ".override" + ext,

stem + ".override" + altExt,

}

if altStem != "" {

candidates = append(candidates,

altStem+".override"+ext,

altStem+".override"+altExt,

)

}

for _, c := range candidates {

if _, err := os.Stat(c); err == nil {

return c

}

return ""

}

// alternateYAMLExt returns the alternate YAML extension (.yml ↔ .yaml).

func alternateYAMLExt(ext string) string {

switch ext {

case ".yml":

return ".yaml"

case ".yaml":

return ".yml"

default:

return ext

}

// alternateComposeStem returns the alternate stem name for a compose file stem.

// e.g. "docker-compose" <-> "compose", otherwise "".

func alternateComposeStem(stem string) string {

base := filepath.Base(stem)

switch base {

case "docker-compose":

return filepath.Join(filepath.Dir(stem), "compose")

case "compose":

return filepath.Join(filepath.Dir(stem), "docker-compose")

default:

return ""

}

// deepMerge merges src into dst and returns the result.

// Slices are replaced, maps are merged recursively, scalars are overwritten.

func deepMerge(dst, src interface{}) interface{} {

switch src := src.(type) {

case map[string]interface{}:

dstMap, ok := dst.(map[string]interface{})

if !ok {

// dst is not a map; src wins

return src

}

for k, v := range src {

dstMap[k] = deepMerge(dstMap[k], v)

}

return dstMap

default:

// Scalars and slices: src wins

return src

}

type Environment []string

// StringOrStringList accepts a YAML string or array of strings.

type StringOrStringList []string

func (s *StringOrStringList) UnmarshalYAML(value *yaml.Node) error {

var single string

if err := value.Decode(&single); err == nil {

*s = []string{single}

return nil

}

var list []string

if err := value.Decode(&list); err == nil {

*s = list

return nil

}

return fmt.Errorf("expected a string or array of strings")

}

func (e *Environment) UnmarshalYAML(value *yaml.Node) error {

// Try array format: ["KEY=VALUE", ...]

var arr []string

if err := value.Decode(&arr); err == nil {

*e = arr

return nil

}

// Try hash format: {KEY: VALUE, ...}

var m map[string]interface{}

if err := value.Decode(&m); err == nil {

var result []string

for k, v := range m {

switch val := v.(type) {

case nil:

result = append(result, k)

default:

result = append(result, k+"="+fmt.Sprint(val))

}

*e = result

return nil

}

return fmt.Errorf("environment must be an array of KEY=VALUE strings or a mapping")

}

type Network struct {

Address string `json:"ipv4Address"`

Gateway string `json:"ipv4Gateway"`

Hostname string `json:"hostname"`

Network string `json:"network"`

}

type InspectConfigImage struct {

Reference string `json:"reference"`

}

type InspectConfiguration struct {

Image InspectConfigImage `json:"image"`

}

type InspectStatus struct {

State string `json:"state"`

Networks []Network `json:"networks"`

}

type InspectData struct {

Status InspectStatus `json:"status"`

Configuration InspectConfiguration `json:"configuration"`

}

func (service *Service) Inspect() (*InspectData, error) {

cmd := exec.Command("container", "inspect", service.Name)

out, err := cmd.Output()

if err != nil {

if exitErr, ok := err.(*exec.ExitError); ok {

return nil, fmt.Errorf("%s", strings.TrimSpace(string(exitErr.Stderr)))

}

return nil, err

}

var inspectData []InspectData

if err := json.Unmarshal(out, &inspectData); err != nil {

return nil, err

}

if len(inspectData) == 0 {

return nil, fmt.Errorf("no data found for service %s", service.Name)

}

return &inspectData[0], nil

}

func (service *Service) Start(detach bool, runArgs []string) error {

// TODO: better name (eg. prefix name with service)

args := []string{"run", "--name", service.Name, "--rm", "--dns-domain", "test"}

if detach {

args = append(args, "--detach")

}

if service.Platform != "" {

arch := strings.TrimPrefix(service.Platform, "linux/")

args = append(args, "--arch", arch)

}

if service.Workdir != "" {

args = append(args, "--workdir", service.Workdir)

}

if service.Deploy.Resources.Limits.Memory != "" {

args = append(args, "--memory", service.Deploy.Resources.Limits.Memory)

}

for _, port := range service.Ports {

args = append(args, "-p", port)

}

for _, env := range service.Environment {

args = append(args, "--env", env)

}

for _, volume := range service.Volumes {

if strings.HasPrefix(volume, "./") {

volume = strings.Replace(volume, "./", "", 1)

}

if !strings.HasPrefix(volume, "/") {

path, err := os.Getwd()

if err != nil {

return err

}

volume = filepath.Join(path, volume)

}

args = append(args, "--volume", volume)

}

if service.Entrypoint != "" {

args = append(args, "--entrypoint", service.Entrypoint)

}

args = append(args, service.Image)

args = append(args, service.Command...)

args = append(args, runArgs...)

// fmt.Println("container", strings.Join(args, " "))

return runContainerWithAuthRetry(args, service.Image)

}

// runContainerCmd runs `container <args...>`, streaming stdout/stderr to the

// user while also capturing stderr so callers can inspect it for errors.

func runContainerCmd(args []string) (stderrOutput string, err error) {

cmd := exec.Command("container", args...)

var stderrBuf bytes.Buffer

cmd.Stdout = os.Stdout

cmd.Stderr = io.MultiWriter(os.Stderr, &stderrBuf)

err = cmd.Run()

return stderrBuf.String(), err

}

// runContainerWithAuthRetry runs `container <args...>` and, if it fails with a

// registry authentication error, attempts to log in to the image's registry

// and retries once.

func runContainerWithAuthRetry(args []string, image string) error {

stderrOut, err := runContainerCmd(args)

if err == nil || !isAuthError(stderrOut) {

return err

}

host := registryHost(image)

if host == "" {

return err

}

log.Printf("Authentication required for registry %s, attempting login...\n", host)

if loginErr := loginToRegistry(host); loginErr != nil {

return fmt.Errorf("%s (auto-login failed: %v)", strings.TrimSpace(stderrOut), loginErr)

}

_, err = runContainerCmd(args)

return err

}

// isAuthError reports whether container output looks like a registry

// authentication failure (e.g. a 401 from Docker Hub or ECR).

func isAuthError(output string) bool {

lower := strings.ToLower(output)

return strings.Contains(output, "401") ||

strings.Contains(lower, "unauthorized") ||

strings.Contains(lower, "access denied") ||

strings.Contains(lower, "no credentials found")

}

// registryHost extracts the registry hostname from an image reference, or

// returns "" if the image uses the default registry (Docker Hub), which

// needs no login.

func registryHost(image string) string {

ref := image

if idx := strings.Index(ref, "@"); idx != -1 {

ref = ref[:idx]

}

parts := strings.SplitN(ref, "/", 2)

if len(parts) < 2 {

return ""

}

first := parts[0]

if strings.Contains(first, ".") || strings.Contains(first, ":") || first == "localhost" {

return first

}

return ""

}

var ecrHostPattern = regexp.MustCompile(`^\d+\.dkr\.ecr\.([a-z0-9-]+)\.amazonaws\.com$`)

// loginToRegistry logs the container runtime in to the given registry host.

// For AWS ECR hosts, it uses the AWS CLI (via AWS_PROFILE, or a prompt if

// unset) to mint a short-lived password. For any other registry, it uses

// CONTAINER_REGISTRY_USERNAME/CONTAINER_REGISTRY_PASSWORD, or prompts for

// them if unset.

func loginToRegistry(host string) error {

if m := ecrHostPattern.FindStringSubmatch(host); m != nil {

return loginToECR(host, m[1])

}

return loginGeneric(host)

}

func loginToECR(host, region string) error {

profile := os.Getenv("AWS_PROFILE")

if profile == "" {

profile = readLine(fmt.Sprintf("AWS profile for %s (blank for default credentials): ", host))

}

args := []string{"ecr", "get-login-password", "--region", region}

if profile != "" {

args = append(args, "--profile", profile)

}

cmd := exec.Command("aws", args...)

var out, stderr bytes.Buffer

cmd.Stdout = &out

cmd.Stderr = &stderr

if err := cmd.Run(); err != nil {

return fmt.Errorf("aws ecr get-login-password failed: %s", strings.TrimSpace(stderr.String()))

}

return containerRegistryLogin(host, "AWS", strings.TrimSpace(out.String()))

}

func loginGeneric(host string) error {

username := os.Getenv("CONTAINER_REGISTRY_USERNAME")

if username == "" {

username = readLine(fmt.Sprintf("Username for %s: ", host))

}

password := os.Getenv("CONTAINER_REGISTRY_PASSWORD")

if password == "" {

password = readSecret(fmt.Sprintf("Password for %s: ", host))

}

return containerRegistryLogin(host, username, password)

}

func containerRegistryLogin(host, username, password string) error {

cmd := exec.Command("container", "registry", "login", host, "--username", username, "--password-stdin")

cmd.Stdin = strings.NewReader(password)

var stderr bytes.Buffer

cmd.Stderr = &stderr

if err := cmd.Run(); err != nil {

return fmt.Errorf("container registry login failed: %s", strings.TrimSpace(stderr.String()))

}

log.Printf("Logged in to registry %s\n", host)

return nil

}

// readLine prompts on stderr and reads a line of input from stdin.

func readLine(prompt string) string {

fmt.Fprint(os.Stderr, prompt)

line, _ := bufio.NewReader(os.Stdin).ReadString('\n')

return strings.TrimSpace(line)

}

// readSecret prompts on stderr and reads a line of input from stdin with

// terminal echo disabled where possible.

func readSecret(prompt string) string {

fmt.Fprint(os.Stderr, prompt)

disable := exec.Command("stty", "-echo")

disable.Stdin = os.Stdin

echoDisabled := disable.Run() == nil

if echoDisabled {

defer func() {

restore := exec.Command("stty", "echo")

restore.Stdin = os.Stdin

restore.Run()

fmt.Fprintln(os.Stderr)

}()

}

line, _ := bufio.NewReader(os.Stdin).ReadString('\n')

return strings.TrimSpace(line)

}

func (service *Service) Stop() error {

return exec.Command("container", "stop", service.Name).Run()

}

func (service *Service) StartExisting() error {

log.Printf("Starting existing container %s\n", service.Name)

cmd := exec.Command("container", "start", service.Name)

cmd.Stdout = os.Stdout

cmd.Stderr = os.Stderr

return cmd.Run()

}

func (service *Service) Logs(follow bool, tail int) error {

args := []string{"logs"}

if follow {

args = append(args, "-f")

}

if tail > 0 {

args = append(args, "-n", fmt.Sprintf("%d", tail))

}

args = append(args, service.Name)

cmd := exec.Command("container", args...)

cmd.Stdout = os.Stdout

cmd.Stderr = os.Stderr

return cmd.Run()

}

// imageExists checks whether the given image reference is available in the container runtime.

func imageExists(image string) bool {

return exec.Command("container", "image", "inspect", image).Run() == nil

}

func imageTagsDiffer(configured, reference string) bool {

// Extract tag from configured image (default "latest")

cfgTag := "latest"

if idx := strings.LastIndex(configured, ":"); idx != -1 {

cfgTag = configured[idx+1:]

}

// Extract tag from reference

refTag := "latest"

if idx := strings.LastIndex(reference, ":"); idx != -1 {

refTag = reference[idx+1:]

}

return cfgTag != refTag

}

func sortedServices(config *Config) []*Service {

// Map names to services for lookup

byName := make(map[string]*Service)

for _, svc := range config.Services {

byName[svc.Name] = svc

}

// Topological sort using Kahn's algorithm

inDegree := make(map[string]int)

dependents := make(map[string][]string) // service -> services that depend on it

for _, svc := range config.Services {

if _, ok := inDegree[svc.Name]; !ok {

inDegree[svc.Name] = 0

}

for _, dep := range svc.DependsOn {

inDegree[svc.Name]++

dependents[dep] = append(dependents[dep], svc.Name)

}

var queue []string

for name, degree := range inDegree {

if degree == 0 {

queue = append(queue, name)

}

var sorted []*Service

for len(queue) > 0 {

name := queue[0]

queue = queue[1:]

sorted = append(sorted, byName[name])

for _, dep := range dependents[name] {

inDegree[dep]--

if inDegree[dep] == 0 {

queue = append(queue, dep)

}

// Append any services not in the sort (e.g. circular deps) at the end

for _, svc := range config.Services {

found := false

for _, s := range sorted {

if s.Name == svc.Name {

found = true

break

}

if !found {

sorted = append(sorted, svc)

}

return sorted

}

// servicesByProfile filters the sorted service list to only those

// matching at least one active profile. Services with no profiles

// are always included.

func servicesByProfile(config *Config, activeProfiles []string) []*Service {

all := sortedServices(config)

var filtered []*Service

for _, svc := range all {

if profileEnabled(svc.Profiles, activeProfiles) {

filtered = append(filtered, svc)

}

return filtered

}

// profileEnabled returns true if the service should be included.

// A service with no profiles is always included.

// Otherwise, at least one of its profiles must be in the active set.

func profileEnabled(serviceProfiles, activeProfiles []string) bool {

if len(serviceProfiles) == 0 {

return true

}

for _, sp := range serviceProfiles {

for _, ap := range activeProfiles {

if sp == ap {

return true

}

return false

}

func printUsage() {

fmt.Print(`Usage: container-compose [OPTIONS] <COMMAND> [ARGS]

A lightweight Docker Compose alternative for Apple's container runtime.

Options:

-f, --file <file> Path to docker-compose.yml (default: docker-compose.yml)

--profile <name> Activate a profile (can be specified multiple times)

-h, --help Show this help message and exit

-v, --version Show version information and exit

Commands:

start [services...] Start services (creates containers if needed).

Defaults to all services, filtered by active profiles.

stop Stop all services

status, ps, ls Show status of all services

logs [options] Print or stream logs from services

run <service> Run a single service command (attached)

Run 'container-compose <command> --help' for more information on a command.

` + "\n")

}

func main() {

composeFile := "docker-compose.yml"

var activeProfiles []string

// Read COMPOSE_PROFILES from environment (comma-separated)

if envProfiles := os.Getenv("COMPOSE_PROFILES"); envProfiles != "" {

for _, p := range strings.Split(envProfiles, ",") {

p = strings.TrimSpace(p)

if p != "" {

activeProfiles = append(activeProfiles, p)

}

args := os.Args[1:]

for len(args) > 0 {

switch args[0] {

case "-f", "--file":

if len(args) < 2 {

fmt.Fprintln(os.Stderr, "Usage: container-compose [-f <file>] <command> [args]")

os.Exit(1)

}

composeFile = args[1]

args = args[2:]

case "--profile":

if len(args) < 2 {

fmt.Fprintln(os.Stderr, "Usage: container-compose --profile <name>")

os.Exit(1)

}

activeProfiles = append(activeProfiles, args[1])

args = args[2:]

case "-v", "--version":

fmt.Printf("container-compose version %s\n", Version)

os.Exit(0)

case "-h", "--help":

printUsage()

os.Exit(0)

default:

goto parseCommand

}

parseCommand:

if len(args) < 1 {

printUsage()

os.Exit(1)

}

config, err := getConfig(composeFile)

if err != nil {

log.Fatal(err)

}

// run requires a service name; all other commands accept optional service names.

if args[0] == "run" && len(args) < 2 {

fmt.Fprintln(os.Stderr, "Usage: container-compose run <service> [args]")

os.Exit(1)

}

switch args[0] {

case "start":

var selectedServices []*Service

if len(args) > 1 {

// User specified service names; only start those

for _, name := range args[1:] {

svc, ok := config.Services[name]

if !ok {

log.Fatalf("Unknown service: %s", name)

}

selectedServices = append(selectedServices, svc)

}

} else {

selectedServices = servicesByProfile(config, activeProfiles)

}

var alerts []string

for _, service := range selectedServices {

name := service.Name

inspectData, err := service.Inspect()

if err == nil {

// Container exists

if inspectData.Configuration.Image.Reference != "" {

if imageTagsDiffer(service.Image, inspectData.Configuration.Image.Reference) {

alert := fmt.Sprintf("WARNING: Service %s is using image %s but docker-compose.yml specifies %s",

name, inspectData.Configuration.Image.Reference, service.Image)

log.Println(alert)

alerts = append(alerts, alert)

}

if inspectData.Status.State == "running" {

log.Printf("Service %s is already running\n", name)

continue

}

if err := service.StartExisting(); err != nil {

log.Println("ERROR:", err)

}

} else {

// Container doesn't exist, create a new one

log.Printf("Starting service %s\n", service.Name)

if err := service.Start(true, nil); err != nil {

log.Println("ERROR:", err)

}

if len(alerts) > 0 {

log.Println("--- Image version alerts ---")

for _, alert := range alerts {

log.Println(alert)

}

case "status", "ps", "ls":

var statusErrors []string

for _, service := range servicesByProfile(config, activeProfiles) {

inspectData, err := service.Inspect()

if err != nil {

if imageExists(service.Image) {

statusErrors = append(statusErrors, fmt.Sprintf("Service %s: %s (image %s is available)", service.Name, err, service.Image))

} else {

statusErrors = append(statusErrors, fmt.Sprintf("Service %s: %s (image %s not pulled)", service.Name, err, service.Image))

}

} else {

log.Printf("Service %s: %s\n", service.Name, inspectData.Status.State)

}

if len(statusErrors) > 0 {

log.Println("--- Errors ---")

for _, errMsg := range statusErrors {

log.Println(errMsg)

}

case "run":

for name, service := range config.Services {

if name == os.Args[2] {

log.Printf("Running service %s\n", service.Name)

if err := service.Start(false, os.Args[3:]); err != nil {

log.Fatal(err)

}

log.Printf("Service %s started\n", name)

}

case "stop":

var stopErrors []string

// Stop in reverse dependency order (dependents first, then dependencies)

sorted := servicesByProfile(config, activeProfiles)

for i := len(sorted) - 1; i >= 0; i-- {

service := sorted[i]

log.Printf("Stopping service %s\n", service.Name)

err := service.Stop()

if err != nil {

stopErrors = append(stopErrors, fmt.Sprintf("Service %s: %s", service.Name, err))

}

if len(stopErrors) > 0 {

log.Println("--- Errors ---")

for _, errMsg := range stopErrors {

log.Println(errMsg)

}

case "login":

var selectedServices []*Service

if len(args) > 1 {

for _, name := range args[1:] {

svc, ok := config.Services[name]

if !ok {

log.Fatalf("Unknown service: %s", name)

}

selectedServices = append(selectedServices, svc)

}

} else {

selectedServices = servicesByProfile(config, activeProfiles)

}

seenHosts := make(map[string]bool)

for _, service := range selectedServices {

host := registryHost(service.Image)

if host == "" || seenHosts[host] {

continue

}

seenHosts[host] = true

if err := loginToRegistry(host); err != nil {

log.Println("ERROR:", err)

}

case "logs":

follow := false

tail := 0

for i := 1; i < len(args); i++ {

switch args[i] {

case "-f", "--follow":

follow = true

case "-n":

if i+1 < len(args) {

fmt.Sscanf(args[i+1], "%d", &tail)

i++

}

default:

log.Fatalf("Usage: container-compose logs [-f] [-n N]")

}

for _, service := range servicesByProfile(config, activeProfiles) {

err := service.Logs(follow, tail)

if err != nil {

log.Println("ERROR:", err)

}

default:

log.Fatalf("Usage: %s <start|status|ps|ls|run|stop|logs>", os.Args[0])

}

container-compose/main.go at main · dgodd/container-compose · GitHub

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