204 lines
5.7 KiB
Go
204 lines
5.7 KiB
Go
// Package workflow generates the GitHub Actions workflow file.
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package workflow
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import (
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"bytes"
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"fmt"
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"text/template"
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"gopkg.in/yaml.v3"
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"github.com/go-i2p/go-gh-mirror/pkg/config"
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"github.com/go-i2p/go-gh-mirror/pkg/logger"
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)
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// Generator generates GitHub Actions workflow files.
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type Generator struct {
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cfg *config.Config
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log *logger.Logger
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}
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// WorkflowTemplate is the structure for the GitHub Actions workflow.
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type WorkflowTemplate struct {
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PrimaryRepo string
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MirrorRepo string
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PrimaryBranch string
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MirrorBranch string
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CronSchedule string
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ForceSync bool
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}
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// NewGenerator creates a new workflow generator.
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func NewGenerator(cfg *config.Config, log *logger.Logger) *Generator {
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return &Generator{
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cfg: cfg,
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log: log,
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}
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}
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// Generate creates a GitHub Actions workflow YAML file.
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func (g *Generator) Generate() (string, error) {
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// Determine cron schedule based on sync interval
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cronSchedule := getCronSchedule(g.cfg.SyncInterval)
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g.log.Debug("Using cron schedule", "schedule", cronSchedule)
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// Prepare template data
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data := WorkflowTemplate{
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PrimaryRepo: g.cfg.PrimaryRepo,
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MirrorRepo: g.cfg.MirrorRepo,
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PrimaryBranch: g.cfg.PrimaryBranch,
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MirrorBranch: g.cfg.MirrorBranch,
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CronSchedule: cronSchedule,
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ForceSync: g.cfg.ForceSync,
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}
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// Generate workflow file from template
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workflowYAML, err := generateWorkflowYAML(data)
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if err != nil {
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return "", fmt.Errorf("failed to generate workflow YAML: %w", err)
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}
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return workflowYAML, nil
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}
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// getCronSchedule converts a sync interval to a cron schedule.
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func getCronSchedule(interval string) string {
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switch interval {
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case "hourly":
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return "0 * * * *"
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case "daily":
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return "0 0 * * *"
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case "weekly":
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return "0 0 * * 0"
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default:
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return "0 * * * *" // Default to hourly
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}
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}
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// generateWorkflowYAML creates the complete workflow YAML from the template.
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func generateWorkflowYAML(data WorkflowTemplate) (string, error) {
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// Create the workflow structure using maps to maintain comment ordering
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workflow := map[string]interface{}{
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"name": "Sync Primary Repository to GitHub Mirror",
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"on": map[string]interface{}{
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"schedule": []map[string]string{
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{"cron": data.CronSchedule},
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},
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"workflow_dispatch": map[string]interface{}{}, // Allow manual triggering
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},
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"jobs": map[string]interface{}{
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"sync": map[string]interface{}{
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"runs-on": "ubuntu-latest",
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"steps": []map[string]interface{}{
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{
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"name": "Checkout GitHub Mirror",
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"uses": "actions/checkout@v3",
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"with": map[string]interface{}{
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"fetch-depth": 0,
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},
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},
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{
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"name": "Configure Git",
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"run": "git config user.name 'GitHub Actions'\ngit config user.email 'actions@github.com'",
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},
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{
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"name": "Sync Primary Repository",
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"run": generateSyncScript(data),
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"env": map[string]string{
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"GITHUB_TOKEN": "${{ secrets.GITHUB_TOKEN }}",
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},
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},
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},
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},
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},
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}
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// Convert workflow to YAML
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var buf bytes.Buffer
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yamlEncoder := yaml.NewEncoder(&buf)
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yamlEncoder.SetIndent(2)
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err := yamlEncoder.Encode(workflow)
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if err != nil {
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return "", fmt.Errorf("failed to encode workflow to YAML: %w", err)
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}
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// Add comments to the generated YAML
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result := addComments(buf.String())
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return result, nil
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}
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// generateSyncScript creates the Git commands for syncing repositories.
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func generateSyncScript(data WorkflowTemplate) string {
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tmpl := `# Add the primary repository as a remote
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git remote add primary {{.PrimaryRepo}}
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# Fetch the latest changes from the primary repository
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git fetch primary
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# Check if the primary branch exists in the primary repository
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if git ls-remote --heads primary {{.PrimaryBranch}} | grep -q {{.PrimaryBranch}}; then
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echo "Primary branch {{.PrimaryBranch}} found in primary repository"
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else
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echo "Error: Primary branch {{.PrimaryBranch}} not found in primary repository"
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exit 1
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fi
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# Check if we're already on the mirror branch
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if git rev-parse --verify --quiet {{.MirrorBranch}}; then
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git checkout {{.MirrorBranch}}
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else
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# Create the mirror branch if it doesn't exist
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git checkout -b {{.MirrorBranch}}
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fi
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{{if .ForceSync}}
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# Force-apply all changes from primary, overriding any conflicts
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echo "Performing force sync from primary/{{.PrimaryBranch}} to {{.MirrorBranch}}"
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git reset --hard primary/{{.PrimaryBranch}}
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{{else}}
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# Attempt to merge changes from primary
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echo "Attempting to merge changes from primary/{{.PrimaryBranch}} to {{.MirrorBranch}}"
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if ! git merge primary/{{.PrimaryBranch}} --no-edit; then
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# If merge fails, prefer the primary repository's changes
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echo "Merge conflict detected, preferring primary repository's changes"
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git checkout --theirs .
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git add .
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git commit -m "Merge primary repository, preferring primary changes in conflicts"
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fi
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{{end}}
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# Push changes back to the mirror repository
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git push origin {{.MirrorBranch}}`
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t, err := template.New("sync").Parse(tmpl)
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if err != nil {
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return "echo 'Error generating sync script'" // Fallback
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}
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var buf bytes.Buffer
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err = t.Execute(&buf, data)
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if err != nil {
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return "echo 'Error generating sync script'" // Fallback
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}
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return buf.String()
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}
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// addComments adds explanatory comments to the YAML.
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func addComments(yaml string) string {
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header := `# GitHub Actions workflow file to sync an external repository to this GitHub mirror.
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# This file was automatically generated by go-gh-mirror.
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#
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# The workflow does the following:
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# - Runs on a scheduled basis (and can also be triggered manually)
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# - Clones the GitHub mirror repository
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# - Fetches changes from the primary external repository
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# - Applies those changes to the mirror repository
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# - Pushes the updated content back to the GitHub mirror
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#
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# Authentication is handled by the GITHUB_TOKEN secret provided by GitHub Actions.
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`
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return header + yaml
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}
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