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package dir
import (
"fmt"
"log"
"os"
"os/user"
"strconv"
"codeberg.org/snonux/gonf/internal/resource"
)
type Dir struct {
path string
source string
user string
group string
mode os.FileMode // this directory's own mode, default 0o750
fileMode os.FileMode // mode for regular files copied from source, default 0o640
prune bool // reconciles extra dest files during a source copy, and recursive-remove during IsAbsent()
absent bool
}
type Option func(*Dir)
func WithSource(source string) Option {
return func(d *Dir) {
d.source = source
}
}
func WithUser(user string) Option {
return func(d *Dir) {
d.user = user
}
}
func WithGroup(group string) Option {
return func(d *Dir) {
d.group = group
}
}
func WithMode(mode os.FileMode) Option {
return func(d *Dir) {
d.mode = mode
}
}
func WithFileMode(mode os.FileMode) Option {
return func(d *Dir) {
d.fileMode = mode
}
}
func WithPrune() Option {
return func(d *Dir) {
d.prune = true
}
}
func IsAbsent() Option {
return func(d *Dir) {
d.absent = true
}
}
func build(path string, opts ...Option) (*Dir, error) {
curr, err := user.Current()
if err != nil {
return nil, fmt.Errorf("failed to get current user for default: %w", err)
}
d := &Dir{
path: path,
mode: 0o750,
fileMode: 0o640,
user: curr.Username,
group: curr.Gid,
}
for _, opt := range opts {
opt(d)
}
return d, nil
}
// apply performs the idempotent OS work for d without registering a
// resource.
func (d *Dir) apply() error {
if d.absent {
return ensureAbsent(d)
}
if err := ensureDirectorySelf(d); err != nil {
return err
}
if d.source == "" {
return nil
}
if err := copySourceTree(d); err != nil {
return err
}
if d.prune {
return pruneTree(d)
}
return nil
}
// ensureDirectorySelf ensures d.path exists as a directory with the desired
// mode and ownership. It is idempotent: an existing directory only has its
// attributes re-enforced, and an existing non-directory is an error.
func ensureDirectorySelf(d *Dir) error {
log.Printf("processing directory: %s", d.path)
info, err := os.Lstat(d.path)
switch {
case err == nil:
if !info.IsDir() {
return fmt.Errorf("%s exists and is not a directory", d.path)
}
log.Printf("directory %s already exists", d.path)
case os.IsNotExist(err):
log.Printf("creating directory %s with mode %v", d.path, d.mode)
if err := os.MkdirAll(d.path, d.mode); err != nil {
return fmt.Errorf("failed to create directory %s: %w", d.path, err)
}
default:
return fmt.Errorf("failed to stat %s: %w", d.path, err)
}
return applyAttributesTo(d.path, d.mode, d.user, d.group)
}
// ensureAbsent removes d.path if it exists. It is idempotent: a missing path
// is not an error. By default non-empty directories are not removed;
// combine with WithPrune() to remove a directory and its contents
// recursively.
func ensureAbsent(d *Dir) error {
log.Printf("ensuring absent: %s", d.path)
remove := os.Remove
if d.prune {
remove = os.RemoveAll
}
if err := remove(d.path); err != nil {
if os.IsNotExist(err) {
log.Printf("%s already absent", d.path)
return nil
}
return fmt.Errorf("failed to remove %s: %w", d.path, err)
}
log.Printf("removed %s", d.path)
return nil
}
// applyAttributesTo is dir's own small chmod/chown helper, deliberately not
// shared with the file package so the two packages' attribute-application
// behavior can evolve independently.
func applyAttributesTo(path string, mode os.FileMode, usr, group string) error {
if err := os.Chmod(path, mode); err != nil {
return fmt.Errorf("failed to chmod %s to %v: %w", path, mode, err)
}
log.Printf("set mode %v for %s", mode, path)
uid, gid := -1, -1
if usr != "" {
u, err := user.Lookup(usr)
if err != nil {
return fmt.Errorf("failed to lookup user %s: %w", usr, err)
}
uid, _ = strconv.Atoi(u.Uid)
}
if group != "" {
gidInt, err := strconv.Atoi(group)
if err != nil {
return fmt.Errorf("group must be numeric for now: %s", group)
}
gid = gidInt
}
if err := os.Chown(path, uid, gid); err != nil {
return fmt.Errorf("failed to chown %s to %s:%s: %w", path, usr, group, err)
}
log.Printf("set owner %s:%s for %s", usr, group, path)
return nil
}
// Ensure builds and applies the directory resource described by opts,
// without registering it.
func Ensure(path string, opts ...Option) error {
d, err := build(path, opts...)
if err != nil {
return err
}
return d.apply()
}
func Have(path string, opts ...Option) resource.Resource {
d, err := build(path, opts...)
if err != nil {
log.Fatalf("failed to apply directory resource %s: %v", path, err)
}
res := resource.Register("Directory", d.path)
if err := d.apply(); err != nil {
log.Fatalf("failed to apply directory resource %s: %v", path, err)
}
return res
}
func Absent(path string, opts ...Option) resource.Resource {
opts = append(opts, IsAbsent())
return Have(path, opts...)
}
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