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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package filecache
import (
"fmt"
"io"
"os"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/hugofs"
"github.com/spf13/afero"
)
// Prune removes expired and unused items from this cache.
// The last one requires a full build so the cache usage can be tracked.
// Note that we operate directly on the filesystem here, so this is not
// thread safe.
func (c Caches) Prune() (int, error) {
counter := 0
for k, cache := range c {
count, err := cache.Prune(false)
counter += count
if err != nil {
if herrors.IsNotExist(err) {
continue
}
return counter, fmt.Errorf("failed to prune cache %q: %w", k, err)
}
}
return counter, nil
}
// Prune removes expired and unused items from this cache.
// If force is set, everything will be removed not considering expiry time.
func (c *Cache) Prune(force bool) (int, error) {
if c.cfg.entryIsDir {
return c.pruneRootDirs(force)
}
if err := c.init(); err != nil {
return 0, err
}
counter := 0
err := afero.Walk(c.Fs, "", func(name string, info os.FileInfo, err error) error {
if info == nil {
return nil
}
name = cleanID(name)
if info.IsDir() {
f, err := c.Fs.Open(name)
if err != nil {
// This cache dir may not exist.
return nil
}
_, err = f.Readdirnames(1)
f.Close()
if err == io.EOF {
// Empty dir.
if name == "." {
// e.g. /_gen/images -- keep it even if empty.
err = nil
} else {
err = c.Fs.Remove(name)
}
}
if err != nil && !herrors.IsNotExist(err) {
return err
}
return nil
}
shouldRemove := force || c.isExpired(info.ModTime())
if !shouldRemove && len(c.entryLocker.seen) > 0 {
// Remove it if it's not been touched/used in the last build.
_, seen := c.entryLocker.seen[name]
shouldRemove = !seen
}
if shouldRemove {
err := c.Fs.Remove(name)
if err == nil {
counter++
}
if err != nil && !herrors.IsNotExist(err) {
return err
}
}
return nil
})
return counter, err
}
func (c *Cache) pruneRootDirs(force bool) (int, error) {
dirs, err := afero.ReadDir(c.Fs, "")
if err != nil {
if herrors.IsNotExist(err) {
return 0, nil
}
return 0, err
}
counter := 0
for _, dir := range dirs {
if !dir.IsDir() {
continue
}
count, err := c.pruneRootDir(dir.Name(), force)
if err != nil {
return counter, err
}
counter += count
}
return counter, nil
}
func (c *Cache) pruneRootDir(dirname string, force bool) (int, error) {
if err := c.init(); err != nil {
return 0, err
}
// Sanity check.
if dirname != "pkg" && len(dirname) < 5 {
panic(fmt.Sprintf("invalid cache dir name: %q", dirname))
}
info, err := c.Fs.Stat(dirname)
if err != nil {
if herrors.IsNotExist(err) {
return 0, nil
}
return 0, err
}
if !force && !c.isExpired(info.ModTime()) {
return 0, nil
}
if c.cfg.isReadOnly {
return hugofs.MakeReadableAndRemoveAllModulePkgDir(c.Fs, dirname)
}
return 1, c.Fs.RemoveAll(dirname)
}
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