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// Package admin manage repos
package admin
import (
"errors"
"fmt"
"io"
"io/fs"
"log"
"os"
"path/filepath"
"github.com/go-git/go-billy/v5/osfs"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/storage/filesystem"
"gopkg.in/ini.v1"
"sigs.k8s.io/yaml"
)
const (
// Read mode operations for repo
Read Action = 0
// Write mode operations for repo
Write = 1
// Admin mode operations for repo
Admin = 2
// GitExportMagic magic file name for daemon export
GitExportMagic = "git-daemon-export-ok"
)
// Action composite type for modes
type Action int
// GitWeb git web configuration
type GitWeb struct {
Owner string `json:"owner"`
Description string `json:"description"`
Category string `json:"category"`
URL string `json:"url"`
}
// Permission authorization controls
type Permission struct {
Role string `json:"role"`
Mode Action `json:"mode"`
}
// GitRepo git repository
type GitRepo struct {
// Public "git-daemon-export-ok" magic file for git-http-backend
Public bool `json:"public"`
// Name game of repository
Name string `json:"name"`
// Web config settings
GitWebConfig *GitWeb `json:"git_web_config"`
// Permissions for authorization
Permissions []*Permission `json:"permissions"`
}
// ServerRepos repos that are part of this server instance
type ServerRepos struct {
Name string `json:"name"`
Version string `json:"version"`
Repos []*GitRepo `json:"repos"`
BasePath string `json:"basepath"`
}
func loadServerConfig(configPath string) *ServerRepos {
file, err := os.Open(configPath)
if err != nil {
log.Fatalf("Failed to open gitserver config %s", err)
}
defer file.Close()
b, err := io.ReadAll(file)
if err != nil {
log.Fatalf("Failed to read the gitserver config %s", err)
}
config := &ServerRepos{}
err = yaml.Unmarshal(b, &config)
if err != nil {
log.Fatalf("Failed to parse gitserver config %s", err)
}
return config
}
// ServerPolicies generate casbin policies
func (s *ServerRepos) ServerPolicies() [][]string {
policies := [][]string{}
for _, repo := range s.Repos {
policies = append(policies, repo.CasbinPolicies()...)
}
return policies
}
// ConfigureRepos run reconciler for all repos
func (s *ServerRepos) ConfigureRepos() {
for _, repo := range s.Repos {
repo.ReconcileRepo(s.BasePath)
}
}
func readOnlyPaths(role, repoName string) [][]string {
return [][]string{
[]string{role, fmt.Sprintf("/%s/info/refs", repoName), "GET"},
[]string{role, fmt.Sprintf("/%s/git-upload-pack", repoName), "POST"},
}
}
func writePaths(role, repoName string) [][]string {
return [][]string{[]string{role, fmt.Sprintf("/%s/git-recieve-pack", repoName), "POST"}}
}
// Policy generate policy for repo base on mode
func (p *Permission) Policy(repoName string) [][]string {
policies := [][]string{}
// if read mode or greater e.g. write mode
if p.Mode >= Read {
policies = append(policies, readOnlyPaths(p.Role, repoName)...)
}
// if write mode
if p.Mode >= Write {
policies = append(policies, writePaths(p.Role, repoName)...)
}
return policies
}
// CasbinPolicies generate all policies
func (r *GitRepo) CasbinPolicies() [][]string {
policies := [][]string{}
for _, perm := range r.Permissions {
policies = append(policies, perm.Policy(r.Name)...)
}
return policies
}
// ReconcileRepo update repo export settings, update web config
func (r *GitRepo) ReconcileRepo(basePath string) {
// if exist -> continue
repoBase := filepath.Join(basePath, fmt.Sprintf("%s.git", r.Name))
_, err := os.Stat(repoBase)
if errors.Is(err, fs.ErrNotExist) {
// if no exist -> init bare
fs := osfs.New(repoBase)
strg := filesystem.NewStorage(fs, nil)
_, _ = git.Init(strg, nil)
}
r.ConfigureExport(repoBase)
if r.GitWebConfig == nil {
r.GitWebConfig = &GitWeb{}
}
r.GitWebConfig.ReconcileGitConf(repoBase)
}
// ConfigureExport setup repo for sharing and configure web settings
func (r *GitRepo) ConfigureExport(repoBase string) {
// do nothing on public repos
okExport := filepath.Join(repoBase, GitExportMagic)
_, err := os.Stat(okExport)
// Not public but the export setting is setting exists
if !r.Public && err == nil {
// delete file
os.Remove(okExport)
return
}
// Not public and the file doesn't exist
if !r.Public && errors.Is(err, fs.ErrNotExist) {
return
}
//
f, err := os.Create(okExport)
defer f.Close()
if err != nil {
log.Fatalf("git-daemon-export-ok coudln't be created %s", err)
}
}
// ReconcileGitConf reconcile gitweb configuration section of gitconfig
func (r *GitWeb) ReconcileGitConf(repoBase string) {
confPath := filepath.Join(repoBase, "config")
cfg, err := ini.Load(confPath)
if err != nil {
log.Fatalf("Coudln't read gitconfig %s", err)
}
// check if empty, delete
if (GitWeb{} == *r) {
if cfg.HasSection("gitweb") {
cfg.DeleteSection("gitweb")
cfg.SaveTo(confPath)
}
return
}
section := cfg.Section("gitweb")
section.Key("description").SetValue(r.Description)
section.Key("owner").SetValue(r.Owner)
section.Key("url").SetValue(r.URL)
section.Key("category").SetValue(r.Category)
cfg.SaveTo(confPath)
}
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