backup-master/internal/agent/collect.go

package agent

import (
	"context"
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"time"

	"gitea.hsrv.site/mrleo1nid/backup-master/internal/archive"
	"gitea.hsrv.site/mrleo1nid/backup-master/internal/catalog"
	"gitea.hsrv.site/mrleo1nid/backup-master/internal/manifest"
	"gitea.hsrv.site/mrleo1nid/backup-master/internal/sysx"
)

// item — что положить в архив: обход Src с именами Name(path) и исключениями Skip.
type item struct {
	Src  string
	Name func(p string) string
	Skip *archive.Matcher
}

// Plan — результат сбора: манифест, содержимое частей и временные файлы дампов.
type Plan struct {
	Manifest manifest.Manifest
	Parts    map[string][]item // имя части → элементы; порядок частей — Manifest.Parts
}

type collector struct {
	ctx      context.Context
	cat      *catalog.Config
	spool    string
	heavyDue bool
	global   *archive.Matcher
	plan     *Plan
}

func (c *collector) warn(format string, a ...any) {
	msg := fmt.Sprintf(format, a...)
	c.plan.Manifest.Warnings = append(c.plan.Manifest.Warnings, msg)
}

func (c *collector) add(part string, it item) {
	if _, ok := c.plan.Parts[part]; !ok {
		c.plan.Manifest.Parts = append(c.plan.Manifest.Parts, part)
	}
	c.plan.Parts[part] = append(c.plan.Parts[part], it)
}

func filesItem(cat, src string, skip *archive.Matcher) item {
	prefix := manifest.FilesPrefix(cat)
	return item{Src: src, Skip: skip, Name: func(p string) string {
		return prefix + strings.TrimPrefix(filepath.ToSlash(p), "/")
	}}
}

func binItem(cat, src string) item {
	prefix := manifest.BinPrefix(cat)
	return item{Src: src, Name: func(p string) string {
		return prefix + strings.TrimPrefix(filepath.ToSlash(p), "/")
	}}
}

func dumpItem(cat, src, name string) item {
	n := manifest.DumpsPrefix(cat) + name
	return item{Src: src, Name: func(string) string { return n }}
}

func treeItem(src, prefix string, skip *archive.Matcher) item {
	return item{Src: src, Skip: skip, Name: func(p string) string {
		rel, err := filepath.Rel(src, p)
		if err != nil || rel == "." {
			return strings.TrimSuffix(prefix, "/")
		}
		return prefix + filepath.ToSlash(rel)
	}}
}

// Collect собирает план бэкапа по каталогу: выполняет дампы в spool, определяет версии.
func Collect(ctx context.Context, cat *catalog.Config, spool string, heavyDue bool) (*Plan, error) {
	c := &collector{
		ctx:      ctx,
		cat:      cat,
		spool:    spool,
		heavyDue: heavyDue,
		global:   archive.NewMatcher(cat.Exclude),
		plan:     &Plan{Parts: map[string][]item{}},
	}
	c.plan.Parts[manifest.MainPart] = nil
	c.plan.Manifest.Parts = []string{manifest.MainPart}
	c.fillSystem()

	var composeSpecs []catalog.Spec
	for _, s := range cat.Categories {
		if s.Disabled {
			continue
		}
		if s.Type == catalog.TypeCompose {
			composeSpecs = append(composeSpecs, s)
			continue
		}
		mc, err := c.collectSpec(s)
		if err != nil {
			return nil, fmt.Errorf("категория %s: %w", s.Name, err)
		}
		if mc != nil {
			c.plan.Manifest.Categories = append(c.plan.Manifest.Categories, *mc)
		}
	}
	if err := c.collectCompose(composeSpecs); err != nil {
		return nil, err
	}
	c.checkCron()
	return c.plan, nil
}

func (c *collector) fillSystem() {
	m := &c.plan.Manifest
	m.FormatVersion = manifest.FormatVersion
	m.CreatedAt = time.Now()
	if h, err := sysx.Output(c.ctx, "hostnamectl", "hostname"); err == nil && h != "" {
		m.Hostname = h
	} else {
		m.Hostname, _ = os.Hostname()
	}
	osr := sysx.OSRelease()
	m.OS = manifest.OSInfo{ID: osr["ID"], VersionID: osr["VERSION_ID"], PrettyName: osr["PRETTY_NAME"], Arch: sysx.DpkgArch(c.ctx)}
	m.Packages = map[string]string{}
	for _, p := range []string{"caddy", "telegraf", "docker-ce", "docker-ce-cli", "containerd.io", "docker-compose-plugin", "docker-buildx-plugin"} {
		if v := sysx.DpkgVersion(c.ctx, p); v != "" {
			m.Packages[p] = v
		}
	}
	m.Features = manifest.Features{
		Blocklist:   sysx.Exists("/etc/cron.d/ban-blacklist"),
		SSHHardened: sysx.Exists("/etc/ssh/sshd_config.d/00-hardening.conf"),
	}
	m.SudoUsers = sysx.GroupMembers("sudo")
}

// collectSpec обрабатывает категории files/systemd/xui. nil — категория неактивна.
func (c *collector) collectSpec(s catalog.Spec) (*manifest.Category, error) {
	if len(s.Detect) > 0 && !anyExists(s.Detect) {
		return nil, nil
	}
	mc := &manifest.Category{
		Name:         s.Name,
		Type:         s.Type,
		Install:      s.Install,
		EnsureDirs:   s.EnsureDirs,
		PostRestore:  s.PostRestore,
		RestoreAfter: s.RestoreAfter,
	}
	skip := archive.NewMatcher(c.cat.Exclude, s.Exclude)
	for _, p := range s.Paths {
		if !sysx.Exists(p) {
			continue
		}
		mc.Paths = append(mc.Paths, p)
		c.add(manifest.MainPart, filesItem(s.Name, p, skip))
	}

	if s.Type == catalog.TypeXUI {
		if err := c.snapshotXUI(mc); err != nil {
			return nil, err
		}
	}
	for _, d := range s.Dumps {
		if err := c.cmdDump(s.Name, d, mc); err != nil {
			return nil, err
		}
	}
	if len(mc.Paths) == 0 && len(mc.Dumps) == 0 {
		return nil, nil
	}

	for _, b := range s.KeepBinaries {
		if sysx.Exists(b) {
			mc.Binaries = append(mc.Binaries, b)
			c.add(manifest.MainPart, binItem(s.Name, b))
		}
	}
	if len(s.VersionCmd) > 0 && sysx.Exists(s.VersionCmd[0]) {
		mc.Version = c.version(s)
	}
	if s.Service != "" && sysx.UnitLoaded(c.ctx, s.Service) {
		en, ac := sysx.UnitState(c.ctx, s.Service)
		mc.Service = &manifest.ServiceState{Unit: s.Service, Enabled: en, Active: ac}
	}
	return mc, nil
}

var defaultVersionRe = regexp.MustCompile(`v?(\d+\.\d+(?:\.\d+)?[\w.+-]*)`)

func (c *collector) version(s catalog.Spec) string {
	ctx, cancel := context.WithTimeout(c.ctx, 15*time.Second)
	defer cancel()
	out, err := sysx.Output(ctx, s.VersionCmd[0], s.VersionCmd[1:]...)
	if err != nil {
		c.warn("%s: не удалось определить версию: %v", s.Name, err)
		return ""
	}
	re := defaultVersionRe
	if s.VersionRegex != "" {
		if r, err := regexp.Compile(s.VersionRegex); err == nil {
			re = r
		}
	}
	if m := re.FindStringSubmatch(out); len(m) > 1 {
		return m[1]
	}
	c.warn("%s: версия не распознана в выводе %q", s.Name, out)
	return ""
}

func (c *collector) spoolDir(cat string) (string, error) {
	d := filepath.Join(c.spool, cat)
	return d, os.MkdirAll(d, 0o700)
}

func (c *collector) cmdDump(cat string, d catalog.CmdDump, mc *manifest.Category) error {
	dir, err := c.spoolDir(cat)
	if err != nil {
		return err
	}
	out := filepath.Join(dir, d.Name)
	if err := sysx.ToFile(c.ctx, out, "bash", "-o", "pipefail", "-c", d.Cmd); err != nil {
		c.warn("%s: дамп %s не удался: %v", cat, d.Name, err)
		return nil
	}
	mc.Dumps = append(mc.Dumps, manifest.Dump{Name: d.Name, Kind: "cmd", RestoreCmd: d.RestoreCmd})
	c.add(manifest.MainPart, dumpItem(cat, out, d.Name))
	return nil
}

func anyExists(paths []string) bool {
	for _, p := range paths {
		if sysx.Exists(p) {
			return true
		}
	}
	return false
}

// treeSize считает размер дерева с учётом исключений (для plan).
func treeSize(src string, skip *archive.Matcher) (int64, int) {
	var size int64
	var n int
	_ = filepath.WalkDir(src, func(p string, d fs.DirEntry, err error) error {
		if err != nil {
			return nil
		}
		if skip.Match(filepath.ToSlash(p)) {
			if d.IsDir() {
				return fs.SkipDir
			}
			return nil
		}
		if d.Type().IsRegular() {
			if fi, err := d.Info(); err == nil {
				size += fi.Size()
				n++
			}
		}
		return nil
	})
	return size, n
}