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rails.go
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rails.go
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package scanner
import (
"os"
"os/exec"
"regexp"
"strings"
)
func configureRails(sourceDir string) (*SourceInfo, error) {
if !checksPass(sourceDir, dirContains("Gemfile", "rails")) {
return nil, nil
}
vars := make(map[string]interface{})
s := &SourceInfo{
Family: "Rails",
Port: 8080,
Statics: []Static{
{
GuestPath: "/app/public",
UrlPrefix: "/",
},
},
PostgresInitCommands: []InitCommand{
{
Command: "bundle",
Args: []string{"add", "pg"},
Description: "Adding the 'pg' gem for Postgres database support",
Condition: !checksPass(sourceDir, dirContains("Gemfile", "pg")),
},
},
ReleaseCmd: "bin/rails fly:release",
Env: map[string]string{
"PORT": "8080",
},
BuildArgs: map[string]string{
"BUILD_COMMAND": "bin/rails fly:build",
"SERVER_COMMAND": "bin/rails fly:server",
},
}
var rubyVersion string
var bundlerVersion string
var nodeVersion string = "latest"
var yarnVersion string = "latest"
out, err := exec.Command("node", "-v").Output()
if err == nil {
nodeVersion = strings.TrimSpace(string(out))
if nodeVersion[:1] == "v" {
nodeVersion = nodeVersion[1:]
}
}
out, err = exec.Command("yarn", "-v").Output()
if err == nil {
yarnVersion = strings.TrimSpace(string(out))
}
rubyVersion, err = extractRubyVersion("Gemfile.lock", "Gemfile", ".ruby_version")
if err != nil || rubyVersion == "" {
rubyVersion = "3.1.2"
out, err := exec.Command("ruby", "-v").Output()
if err == nil {
version := strings.TrimSpace(string(out))
re := regexp.MustCompile(`ruby (?P<version>[\d.]+)`)
m := re.FindStringSubmatch(version)
for i, name := range re.SubexpNames() {
if len(m) > 0 && name == "version" {
rubyVersion = m[i]
}
}
}
}
bundlerVersion, err = extractBundlerVersion("Gemfile.lock")
if err != nil || bundlerVersion == "" {
bundlerVersion = "2.3.21"
out, err := exec.Command("bundle", "-v").Output()
if err == nil {
version := strings.TrimSpace(string(out))
re := regexp.MustCompile(`Bundler version (?P<version>[\d.]+)`)
m := re.FindStringSubmatch(version)
for i, name := range re.SubexpNames() {
if len(m) > 0 && name == "version" {
bundlerVersion = m[i]
}
}
}
}
// master.key comes with Rails apps from v5.2 onwards, but may not be present
// if the app does not use Rails encrypted credentials. Rails v6 added
// support for multi-environment credentials. Use the Rails searching
// sequence for production credentials to determine the RAILS_MASTER_KEY.
masterKey, err := os.ReadFile("config/credentials/production.key")
if err != nil {
masterKey, err = os.ReadFile("config/master.key")
}
if err == nil {
s.Secrets = []Secret{
{
Key: "RAILS_MASTER_KEY",
Help: "Secret key for accessing encrypted credentials",
Value: string(masterKey),
},
}
}
_, err = os.Stat("node_modules")
vars["node"] = !os.IsNotExist(err)
_, err = os.Stat("yarn.lock")
vars["yarn"] = !os.IsNotExist(err)
vars["rubyVersion"] = rubyVersion
vars["bundlerVersion"] = bundlerVersion
vars["nodeVersion"] = nodeVersion
vars["yarnVersion"] = yarnVersion
s.Files = templatesExecute("templates/rails/standard", vars)
s.SkipDeploy = true
s.DeployDocs = `
Your Rails app is prepared for deployment.
If you need custom packages installed, or have problems with your deployment
build, you may need to edit the Dockerfile for app-specific changes. If you
need help, please post on https://community.fly.io.
Now: run 'fly deploy' to deploy your Rails app.
`
return s, nil
}
func extractRubyVersion(lockfilePath string, gemfilePath string, rubyVersionPath string) (string, error) {
var version string
lockfileContents, err := os.ReadFile(lockfilePath)
if err == nil {
re := regexp.MustCompile(`RUBY VERSION\s+ruby (?P<version>[\d.]+)`)
m := re.FindStringSubmatch(string(lockfileContents))
for i, name := range re.SubexpNames() {
if len(m) > 0 && name == "version" {
version = m[i]
}
}
}
if version == "" {
gemfileContents, err := os.ReadFile(gemfilePath)
if err != nil {
return "", err
}
re := regexp.MustCompile(`ruby \"(?P<version>[\d.]+)\"`)
m := re.FindStringSubmatch(string(gemfileContents))
for i, name := range re.SubexpNames() {
if len(m) > 0 && name == "version" {
version = m[i]
}
}
}
if version == "" {
if _, err := os.Stat(rubyVersionPath); err == nil {
versionString, err := os.ReadFile(rubyVersionPath)
if err != nil {
return "", err
}
version = string(versionString)
}
}
return version, nil
}
func extractBundlerVersion(gemfileLockPath string) (string, error) {
gemfileContents, err := os.ReadFile(gemfileLockPath)
var version string
if err != nil {
return "", err
}
re := regexp.MustCompile(`BUNDLED WITH\n\s{3}(?P<version>[\d.]+)\n`)
m := re.FindStringSubmatch(string(gemfileContents))
for i, name := range re.SubexpNames() {
if len(m) > 0 && name == "version" {
version = m[i]
}
}
return version, nil
}